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* [PATCH v16 00/12] Carry forward IMA measurement log on kexec on ARM64
@ 2021-02-04 16:41 ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

On kexec file load Integrity Measurement Architecture (IMA) subsystem
may verify the IMA signature of the kernel and initramfs, and measure
it.  The command line parameters passed to the kernel in the kexec call
may also be measured by IMA.  A remote attestation service can verify
a TPM quote based on the TPM event log, the IMA measurement list, and
the TPM PCR data.  This can be achieved only if the IMA measurement log
is carried over from the current kernel to the next kernel across
the kexec call.

powerpc already supports carrying forward the IMA measurement log on
kexec.  This patch set adds support for carrying forward the IMA
measurement log on kexec on ARM64.

This patch set moves the platform independent code defined for powerpc
such that it can be reused for other platforms as well.  A chosen node
"linux,ima-kexec-buffer" is added to the DTB for ARM64 to hold
the address and the size of the memory reserved to carry
the IMA measurement log.

This patch set has been tested for ARM64 platform using QEMU.
I would like help from the community for testing this change on powerpc.
Thanks.

This patch set is based on
commit b3f82afc1041 ("IMA: Measure kernel version in early boot")
in https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
"next-integrity" branch.

Changelog:

v16
  - Defined functions to allocate and free buffer for FDT for powerpc
    and arm64.
  - Moved ima_buffer_addr and ima_buffer_size fields from
    "struct kimage_arch" in powerpc to "struct kimage"
v15
  - Included Rob's patches in the patch set, and rebased
    the changes to "next-integrity" branch.
  - Allocate memory for DTB, on arm64, using kmalloc() instead of
    vmalloc() to keep it consistent with powerpc implementation.
  - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
    remove setup_new_fdt() in the same patch to keep it bisect safe.

v14
  - Select CONFIG_HAVE_IMA_KEXEC for CONFIG_KEXEC_FILE, for powerpc
    and arm64, if CONFIG_IMA is enabled.
  - Use IS_ENABLED() macro instead of "#ifdef" in remove_ima_buffer(),
    ima_get_kexec_buffer(), and ima_free_kexec_buffer().
  - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
    remove setup_new_fdt() in "arch/powerpc/kexec/file_load.c".

v13
  - Moved the arch independent functions to drivers/of/kexec.c
    and then refactored the code.
  - Moved arch_ima_add_kexec_buffer() to
    security/integrity/ima/ima_kexec.c

v12
  - Use fdt_appendprop_addrrange() in setup_ima_buffer()
    to setup the IMA measurement list property in
    the device tree.
  - Moved architecture independent functions from
    "arch/powerpc/kexec/ima.c" to "drivers/of/kexec."
  - Deleted "arch/powerpc/kexec/ima.c" and
    "arch/powerpc/include/asm/ima.h".

v11
  - Rebased the changes on the kexec code refactoring done by
    Rob Herring in his "dt/kexec" branch
  - Removed "extern" keyword in function declarations
  - Removed unnecessary header files included in C files
  - Updated patch descriptions per Thiago's comments

v10
  - Moved delete_fdt_mem_rsv(), remove_ima_buffer(),
    get_ima_kexec_buffer, and get_root_addr_size_cells()
    to drivers/of/kexec.c
  - Moved arch_ima_add_kexec_buffer() to
    security/integrity/ima/ima_kexec.c
  - Conditionally define IMA buffer fields in struct kimage_arch

v9
  - Moved delete_fdt_mem_rsv() to drivers/of/kexec_fdt.c
  - Defined a new function get_ima_kexec_buffer() in
    drivers/of/ima_kexec.c to replace do_get_kexec_buffer()
  - Changed remove_ima_kexec_buffer() to the original function name
    remove_ima_buffer()
  - Moved remove_ima_buffer() to drivers/of/ima_kexec.c
  - Moved ima_get_kexec_buffer() and ima_free_kexec_buffer()
    to security/integrity/ima/ima_kexec.c

v8:
  - Moved remove_ima_kexec_buffer(), do_get_kexec_buffer(), and
    delete_fdt_mem_rsv() to drivers/of/fdt.c
  - Moved ima_dump_measurement_list() and ima_add_kexec_buffer()
    back to security/integrity/ima/ima_kexec.c

v7:
  - Renamed remove_ima_buffer() to remove_ima_kexec_buffer() and moved
    this function definition to kernel.
  - Moved delete_fdt_mem_rsv() definition to kernel
  - Moved ima_dump_measurement_list() and ima_add_kexec_buffer() to
    a new file namely ima_kexec_fdt.c in IMA

v6:
  - Remove any existing FDT_PROP_IMA_KEXEC_BUFFER property in the device
    tree and also its corresponding memory reservation in the currently
    running kernel.
  - Moved the function remove_ima_buffer() defined for powerpc to IMA
    and renamed the function to ima_remove_kexec_buffer(). Also, moved
    delete_fdt_mem_rsv() from powerpc to IMA.

v5:
  - Merged get_addr_size_cells() and do_get_kexec_buffer() into a single
    function when moving the arch independent code from powerpc to IMA
  - Reverted the change to use FDT functions in powerpc code and added
    back the original code in get_addr_size_cells() and
    do_get_kexec_buffer() for powerpc.
  - Added fdt_add_mem_rsv() for ARM64 to reserve the memory for
    the IMA log buffer during kexec.
  - Fixed the warning reported by kernel test bot for ARM64
    arch_ima_add_kexec_buffer() - moved this function to a new file
    namely arch/arm64/kernel/ima_kexec.c

v4:
  - Submitting the patch series on behalf of the original author
    Prakhar Srivastava <prsriva@linux.microsoft.com>
  - Moved FDT_PROP_IMA_KEXEC_BUFFER ("linux,ima-kexec-buffer") to
    libfdt.h so that it can be shared by multiple platforms.

v3:
Breakup patches further into separate patches.
  - Refactoring non architecture specific code out of powerpc
  - Update powerpc related code to use fdt functions
  - Update IMA buffer read related code to use of functions
  - Add support to store the memory information of the IMA
    measurement logs to be carried forward.
  - Update the property strings to align with documented nodes
    https://github.com/devicetree-org/dt-schema/pull/46

v2:
  Break patches into separate patches.
  - Powerpc related Refactoring
  - Updating the docuemntation for chosen node
  - Updating arm64 to support IMA buffer pass

v1:
  Refactoring carrying over IMA measuremnet logs over Kexec. This patch
    moves the non-architecture specific code out of powerpc and adds to
    security/ima.(Suggested by Thiago)
  Add Documentation regarding the ima-kexec-buffer node in the chosen
    node documentation

v0:
  Add a layer of abstraction to use the memory reserved by device tree
    for ima buffer pass.
  Add support for ima buffer pass using reserved memory for arm64 kexec.
    Update the arch sepcific code path in kexec file load to store the
    ima buffer in the reserved memory. The same reserved memory is read
    on kexec or cold boot.


Lakshmi Ramasubramanian (8):
  powerpc: Move ima buffer fields to struct kimage
  powerpc: Move arch independent ima kexec functions to
    drivers/of/kexec.c
  kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
  powerpc: Delete unused function delete_fdt_mem_rsv()
  of: Define functions to allocate and free FDT
  arm64: Use OF alloc and free functions for FDT
  powerpc: Use OF alloc and free for FDT
  arm64: Enable passing IMA log to next kernel on kexec

Rob Herring (4):
  powerpc: Rename kexec elfcorehdr_addr to elf_headers_mem
  of: Add a common kexec FDT setup function
  arm64: Use common of_kexec_setup_new_fdt()
  powerpc: Use common of_kexec_setup_new_fdt()

 arch/arm64/Kconfig                     |   1 +
 arch/arm64/kernel/machine_kexec_file.c | 158 +-------
 arch/powerpc/Kconfig                   |   2 +-
 arch/powerpc/include/asm/ima.h         |  30 --
 arch/powerpc/include/asm/kexec.h       |  11 +-
 arch/powerpc/kexec/Makefile            |   7 -
 arch/powerpc/kexec/elf_64.c            |  26 +-
 arch/powerpc/kexec/file_load.c         | 184 +---------
 arch/powerpc/kexec/file_load_64.c      |  11 +-
 arch/powerpc/kexec/ima.c               | 219 -----------
 drivers/of/Makefile                    |   1 +
 drivers/of/kexec.c                     | 488 +++++++++++++++++++++++++
 include/linux/kexec.h                  |   5 +
 include/linux/of.h                     |  15 +-
 security/integrity/ima/ima.h           |   4 -
 security/integrity/ima/ima_kexec.c     |   3 +-
 16 files changed, 552 insertions(+), 613 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/ima.h
 delete mode 100644 arch/powerpc/kexec/ima.c
 create mode 100644 drivers/of/kexec.c

-- 
2.30.0


^ permalink raw reply	[flat|nested] 58+ messages in thread
* [PATCH v16 00/12] Carry forward IMA measurement log on kexec on ARM64
@ 2021-02-04 16:41 ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

On kexec file load Integrity Measurement Architecture (IMA) subsystem
may verify the IMA signature of the kernel and initramfs, and measure
it.  The command line parameters passed to the kernel in the kexec call
may also be measured by IMA.  A remote attestation service can verify
a TPM quote based on the TPM event log, the IMA measurement list, and
the TPM PCR data.  This can be achieved only if the IMA measurement log
is carried over from the current kernel to the next kernel across
the kexec call.

powerpc already supports carrying forward the IMA measurement log on
kexec.  This patch set adds support for carrying forward the IMA
measurement log on kexec on ARM64.

This patch set moves the platform independent code defined for powerpc
such that it can be reused for other platforms as well.  A chosen node
"linux,ima-kexec-buffer" is added to the DTB for ARM64 to hold
the address and the size of the memory reserved to carry
the IMA measurement log.

This patch set has been tested for ARM64 platform using QEMU.
I would like help from the community for testing this change on powerpc.
Thanks.

This patch set is based on
commit b3f82afc1041 ("IMA: Measure kernel version in early boot")
in https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
"next-integrity" branch.

Changelog:

v16
  - Defined functions to allocate and free buffer for FDT for powerpc
    and arm64.
  - Moved ima_buffer_addr and ima_buffer_size fields from
    "struct kimage_arch" in powerpc to "struct kimage"
v15
  - Included Rob's patches in the patch set, and rebased
    the changes to "next-integrity" branch.
  - Allocate memory for DTB, on arm64, using kmalloc() instead of
    vmalloc() to keep it consistent with powerpc implementation.
  - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
    remove setup_new_fdt() in the same patch to keep it bisect safe.

v14
  - Select CONFIG_HAVE_IMA_KEXEC for CONFIG_KEXEC_FILE, for powerpc
    and arm64, if CONFIG_IMA is enabled.
  - Use IS_ENABLED() macro instead of "#ifdef" in remove_ima_buffer(),
    ima_get_kexec_buffer(), and ima_free_kexec_buffer().
  - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
    remove setup_new_fdt() in "arch/powerpc/kexec/file_load.c".

v13
  - Moved the arch independent functions to drivers/of/kexec.c
    and then refactored the code.
  - Moved arch_ima_add_kexec_buffer() to
    security/integrity/ima/ima_kexec.c

v12
  - Use fdt_appendprop_addrrange() in setup_ima_buffer()
    to setup the IMA measurement list property in
    the device tree.
  - Moved architecture independent functions from
    "arch/powerpc/kexec/ima.c" to "drivers/of/kexec."
  - Deleted "arch/powerpc/kexec/ima.c" and
    "arch/powerpc/include/asm/ima.h".

v11
  - Rebased the changes on the kexec code refactoring done by
    Rob Herring in his "dt/kexec" branch
  - Removed "extern" keyword in function declarations
  - Removed unnecessary header files included in C files
  - Updated patch descriptions per Thiago's comments

v10
  - Moved delete_fdt_mem_rsv(), remove_ima_buffer(),
    get_ima_kexec_buffer, and get_root_addr_size_cells()
    to drivers/of/kexec.c
  - Moved arch_ima_add_kexec_buffer() to
    security/integrity/ima/ima_kexec.c
  - Conditionally define IMA buffer fields in struct kimage_arch

v9
  - Moved delete_fdt_mem_rsv() to drivers/of/kexec_fdt.c
  - Defined a new function get_ima_kexec_buffer() in
    drivers/of/ima_kexec.c to replace do_get_kexec_buffer()
  - Changed remove_ima_kexec_buffer() to the original function name
    remove_ima_buffer()
  - Moved remove_ima_buffer() to drivers/of/ima_kexec.c
  - Moved ima_get_kexec_buffer() and ima_free_kexec_buffer()
    to security/integrity/ima/ima_kexec.c

v8:
  - Moved remove_ima_kexec_buffer(), do_get_kexec_buffer(), and
    delete_fdt_mem_rsv() to drivers/of/fdt.c
  - Moved ima_dump_measurement_list() and ima_add_kexec_buffer()
    back to security/integrity/ima/ima_kexec.c

v7:
  - Renamed remove_ima_buffer() to remove_ima_kexec_buffer() and moved
    this function definition to kernel.
  - Moved delete_fdt_mem_rsv() definition to kernel
  - Moved ima_dump_measurement_list() and ima_add_kexec_buffer() to
    a new file namely ima_kexec_fdt.c in IMA

v6:
  - Remove any existing FDT_PROP_IMA_KEXEC_BUFFER property in the device
    tree and also its corresponding memory reservation in the currently
    running kernel.
  - Moved the function remove_ima_buffer() defined for powerpc to IMA
    and renamed the function to ima_remove_kexec_buffer(). Also, moved
    delete_fdt_mem_rsv() from powerpc to IMA.

v5:
  - Merged get_addr_size_cells() and do_get_kexec_buffer() into a single
    function when moving the arch independent code from powerpc to IMA
  - Reverted the change to use FDT functions in powerpc code and added
    back the original code in get_addr_size_cells() and
    do_get_kexec_buffer() for powerpc.
  - Added fdt_add_mem_rsv() for ARM64 to reserve the memory for
    the IMA log buffer during kexec.
  - Fixed the warning reported by kernel test bot for ARM64
    arch_ima_add_kexec_buffer() - moved this function to a new file
    namely arch/arm64/kernel/ima_kexec.c

v4:
  - Submitting the patch series on behalf of the original author
    Prakhar Srivastava <prsriva@linux.microsoft.com>
  - Moved FDT_PROP_IMA_KEXEC_BUFFER ("linux,ima-kexec-buffer") to
    libfdt.h so that it can be shared by multiple platforms.

v3:
Breakup patches further into separate patches.
  - Refactoring non architecture specific code out of powerpc
  - Update powerpc related code to use fdt functions
  - Update IMA buffer read related code to use of functions
  - Add support to store the memory information of the IMA
    measurement logs to be carried forward.
  - Update the property strings to align with documented nodes
    https://github.com/devicetree-org/dt-schema/pull/46

v2:
  Break patches into separate patches.
  - Powerpc related Refactoring
  - Updating the docuemntation for chosen node
  - Updating arm64 to support IMA buffer pass

v1:
  Refactoring carrying over IMA measuremnet logs over Kexec. This patch
    moves the non-architecture specific code out of powerpc and adds to
    security/ima.(Suggested by Thiago)
  Add Documentation regarding the ima-kexec-buffer node in the chosen
    node documentation

v0:
  Add a layer of abstraction to use the memory reserved by device tree
    for ima buffer pass.
  Add support for ima buffer pass using reserved memory for arm64 kexec.
    Update the arch sepcific code path in kexec file load to store the
    ima buffer in the reserved memory. The same reserved memory is read
    on kexec or cold boot.


Lakshmi Ramasubramanian (8):
  powerpc: Move ima buffer fields to struct kimage
  powerpc: Move arch independent ima kexec functions to
    drivers/of/kexec.c
  kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
  powerpc: Delete unused function delete_fdt_mem_rsv()
  of: Define functions to allocate and free FDT
  arm64: Use OF alloc and free functions for FDT
  powerpc: Use OF alloc and free for FDT
  arm64: Enable passing IMA log to next kernel on kexec

Rob Herring (4):
  powerpc: Rename kexec elfcorehdr_addr to elf_headers_mem
  of: Add a common kexec FDT setup function
  arm64: Use common of_kexec_setup_new_fdt()
  powerpc: Use common of_kexec_setup_new_fdt()

 arch/arm64/Kconfig                     |   1 +
 arch/arm64/kernel/machine_kexec_file.c | 158 +-------
 arch/powerpc/Kconfig                   |   2 +-
 arch/powerpc/include/asm/ima.h         |  30 --
 arch/powerpc/include/asm/kexec.h       |  11 +-
 arch/powerpc/kexec/Makefile            |   7 -
 arch/powerpc/kexec/elf_64.c            |  26 +-
 arch/powerpc/kexec/file_load.c         | 184 +---------
 arch/powerpc/kexec/file_load_64.c      |  11 +-
 arch/powerpc/kexec/ima.c               | 219 -----------
 drivers/of/Makefile                    |   1 +
 drivers/of/kexec.c                     | 488 +++++++++++++++++++++++++
 include/linux/kexec.h                  |   5 +
 include/linux/of.h                     |  15 +-
 security/integrity/ima/ima.h           |   4 -
 security/integrity/ima/ima_kexec.c     |   3 +-
 16 files changed, 552 insertions(+), 613 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/ima.h
 delete mode 100644 arch/powerpc/kexec/ima.c
 create mode 100644 drivers/of/kexec.c

-- 
2.30.0


^ permalink raw reply	[flat|nested] 58+ messages in thread
* [PATCH v16 00/12] Carry forward IMA measurement log on kexec on ARM64
@ 2021-02-04 16:41 ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

On kexec file load Integrity Measurement Architecture (IMA) subsystem
may verify the IMA signature of the kernel and initramfs, and measure
it.  The command line parameters passed to the kernel in the kexec call
may also be measured by IMA.  A remote attestation service can verify
a TPM quote based on the TPM event log, the IMA measurement list, and
the TPM PCR data.  This can be achieved only if the IMA measurement log
is carried over from the current kernel to the next kernel across
the kexec call.

powerpc already supports carrying forward the IMA measurement log on
kexec.  This patch set adds support for carrying forward the IMA
measurement log on kexec on ARM64.

This patch set moves the platform independent code defined for powerpc
such that it can be reused for other platforms as well.  A chosen node
"linux,ima-kexec-buffer" is added to the DTB for ARM64 to hold
the address and the size of the memory reserved to carry
the IMA measurement log.

This patch set has been tested for ARM64 platform using QEMU.
I would like help from the community for testing this change on powerpc.
Thanks.

This patch set is based on
commit b3f82afc1041 ("IMA: Measure kernel version in early boot")
in https://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity.git
"next-integrity" branch.

Changelog:

v16
  - Defined functions to allocate and free buffer for FDT for powerpc
    and arm64.
  - Moved ima_buffer_addr and ima_buffer_size fields from
    "struct kimage_arch" in powerpc to "struct kimage"
v15
  - Included Rob's patches in the patch set, and rebased
    the changes to "next-integrity" branch.
  - Allocate memory for DTB, on arm64, using kmalloc() instead of
    vmalloc() to keep it consistent with powerpc implementation.
  - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
    remove setup_new_fdt() in the same patch to keep it bisect safe.

v14
  - Select CONFIG_HAVE_IMA_KEXEC for CONFIG_KEXEC_FILE, for powerpc
    and arm64, if CONFIG_IMA is enabled.
  - Use IS_ENABLED() macro instead of "#ifdef" in remove_ima_buffer(),
    ima_get_kexec_buffer(), and ima_free_kexec_buffer().
  - Call of_kexec_setup_new_fdt() from setup_new_fdt_ppc64() and
    remove setup_new_fdt() in "arch/powerpc/kexec/file_load.c".

v13
  - Moved the arch independent functions to drivers/of/kexec.c
    and then refactored the code.
  - Moved arch_ima_add_kexec_buffer() to
    security/integrity/ima/ima_kexec.c

v12
  - Use fdt_appendprop_addrrange() in setup_ima_buffer()
    to setup the IMA measurement list property in
    the device tree.
  - Moved architecture independent functions from
    "arch/powerpc/kexec/ima.c" to "drivers/of/kexec."
  - Deleted "arch/powerpc/kexec/ima.c" and
    "arch/powerpc/include/asm/ima.h".

v11
  - Rebased the changes on the kexec code refactoring done by
    Rob Herring in his "dt/kexec" branch
  - Removed "extern" keyword in function declarations
  - Removed unnecessary header files included in C files
  - Updated patch descriptions per Thiago's comments

v10
  - Moved delete_fdt_mem_rsv(), remove_ima_buffer(),
    get_ima_kexec_buffer, and get_root_addr_size_cells()
    to drivers/of/kexec.c
  - Moved arch_ima_add_kexec_buffer() to
    security/integrity/ima/ima_kexec.c
  - Conditionally define IMA buffer fields in struct kimage_arch

v9
  - Moved delete_fdt_mem_rsv() to drivers/of/kexec_fdt.c
  - Defined a new function get_ima_kexec_buffer() in
    drivers/of/ima_kexec.c to replace do_get_kexec_buffer()
  - Changed remove_ima_kexec_buffer() to the original function name
    remove_ima_buffer()
  - Moved remove_ima_buffer() to drivers/of/ima_kexec.c
  - Moved ima_get_kexec_buffer() and ima_free_kexec_buffer()
    to security/integrity/ima/ima_kexec.c

v8:
  - Moved remove_ima_kexec_buffer(), do_get_kexec_buffer(), and
    delete_fdt_mem_rsv() to drivers/of/fdt.c
  - Moved ima_dump_measurement_list() and ima_add_kexec_buffer()
    back to security/integrity/ima/ima_kexec.c

v7:
  - Renamed remove_ima_buffer() to remove_ima_kexec_buffer() and moved
    this function definition to kernel.
  - Moved delete_fdt_mem_rsv() definition to kernel
  - Moved ima_dump_measurement_list() and ima_add_kexec_buffer() to
    a new file namely ima_kexec_fdt.c in IMA

v6:
  - Remove any existing FDT_PROP_IMA_KEXEC_BUFFER property in the device
    tree and also its corresponding memory reservation in the currently
    running kernel.
  - Moved the function remove_ima_buffer() defined for powerpc to IMA
    and renamed the function to ima_remove_kexec_buffer(). Also, moved
    delete_fdt_mem_rsv() from powerpc to IMA.

v5:
  - Merged get_addr_size_cells() and do_get_kexec_buffer() into a single
    function when moving the arch independent code from powerpc to IMA
  - Reverted the change to use FDT functions in powerpc code and added
    back the original code in get_addr_size_cells() and
    do_get_kexec_buffer() for powerpc.
  - Added fdt_add_mem_rsv() for ARM64 to reserve the memory for
    the IMA log buffer during kexec.
  - Fixed the warning reported by kernel test bot for ARM64
    arch_ima_add_kexec_buffer() - moved this function to a new file
    namely arch/arm64/kernel/ima_kexec.c

v4:
  - Submitting the patch series on behalf of the original author
    Prakhar Srivastava <prsriva@linux.microsoft.com>
  - Moved FDT_PROP_IMA_KEXEC_BUFFER ("linux,ima-kexec-buffer") to
    libfdt.h so that it can be shared by multiple platforms.

v3:
Breakup patches further into separate patches.
  - Refactoring non architecture specific code out of powerpc
  - Update powerpc related code to use fdt functions
  - Update IMA buffer read related code to use of functions
  - Add support to store the memory information of the IMA
    measurement logs to be carried forward.
  - Update the property strings to align with documented nodes
    https://github.com/devicetree-org/dt-schema/pull/46

v2:
  Break patches into separate patches.
  - Powerpc related Refactoring
  - Updating the docuemntation for chosen node
  - Updating arm64 to support IMA buffer pass

v1:
  Refactoring carrying over IMA measuremnet logs over Kexec. This patch
    moves the non-architecture specific code out of powerpc and adds to
    security/ima.(Suggested by Thiago)
  Add Documentation regarding the ima-kexec-buffer node in the chosen
    node documentation

v0:
  Add a layer of abstraction to use the memory reserved by device tree
    for ima buffer pass.
  Add support for ima buffer pass using reserved memory for arm64 kexec.
    Update the arch sepcific code path in kexec file load to store the
    ima buffer in the reserved memory. The same reserved memory is read
    on kexec or cold boot.


Lakshmi Ramasubramanian (8):
  powerpc: Move ima buffer fields to struct kimage
  powerpc: Move arch independent ima kexec functions to
    drivers/of/kexec.c
  kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
  powerpc: Delete unused function delete_fdt_mem_rsv()
  of: Define functions to allocate and free FDT
  arm64: Use OF alloc and free functions for FDT
  powerpc: Use OF alloc and free for FDT
  arm64: Enable passing IMA log to next kernel on kexec

Rob Herring (4):
  powerpc: Rename kexec elfcorehdr_addr to elf_headers_mem
  of: Add a common kexec FDT setup function
  arm64: Use common of_kexec_setup_new_fdt()
  powerpc: Use common of_kexec_setup_new_fdt()

 arch/arm64/Kconfig                     |   1 +
 arch/arm64/kernel/machine_kexec_file.c | 158 +-------
 arch/powerpc/Kconfig                   |   2 +-
 arch/powerpc/include/asm/ima.h         |  30 --
 arch/powerpc/include/asm/kexec.h       |  11 +-
 arch/powerpc/kexec/Makefile            |   7 -
 arch/powerpc/kexec/elf_64.c            |  26 +-
 arch/powerpc/kexec/file_load.c         | 184 +---------
 arch/powerpc/kexec/file_load_64.c      |  11 +-
 arch/powerpc/kexec/ima.c               | 219 -----------
 drivers/of/Makefile                    |   1 +
 drivers/of/kexec.c                     | 488 +++++++++++++++++++++++++
 include/linux/kexec.h                  |   5 +
 include/linux/of.h                     |  15 +-
 security/integrity/ima/ima.h           |   4 -
 security/integrity/ima/ima_kexec.c     |   3 +-
 16 files changed, 552 insertions(+), 613 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/ima.h
 delete mode 100644 arch/powerpc/kexec/ima.c
 create mode 100644 drivers/of/kexec.c

-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 58+ messages in thread
* [PATCH v16 01/12] powerpc: Rename kexec elfcorehdr_addr to elf_headers_mem
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The architecture specific field, elfcorehdr_addr in struct kimage_arch,
that holds the address of the buffer in memory for ELF core header for
powerpc has a different name than the one used for arm64.  This makes
it hard to have a common code for setting up the device tree for
kexec system call.

Rename elfcorehdr_addr to elf_headers_mem to align with arm64 name so
common code can use it.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/include/asm/kexec.h  | 2 +-
 arch/powerpc/kexec/file_load.c    | 4 ++--
 arch/powerpc/kexec/file_load_64.c | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 55d6ede30c19..dbf09d2f36d0 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -108,7 +108,7 @@ struct kimage_arch {
 	unsigned long backup_start;
 	void *backup_buf;
 
-	unsigned long elfcorehdr_addr;
+	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
 
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 9a232bc36c8f..e452b11df631 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -45,7 +45,7 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 		return NULL;
 
 	elfcorehdr_strlen = sprintf(cmdline_ptr, "elfcorehdr=0x%lx ",
-				    image->arch.elfcorehdr_addr);
+				    image->arch.elf_headers_mem);
 
 	if (elfcorehdr_strlen + cmdline_len > COMMAND_LINE_SIZE) {
 		pr_err("Appending elfcorehdr=<addr> exceeds cmdline size\n");
@@ -263,7 +263,7 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		 * Avoid elfcorehdr from being stomped on in kdump kernel by
 		 * setting up memory reserve map.
 		 */
-		ret = fdt_add_mem_rsv(fdt, image->arch.elfcorehdr_addr,
+		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
 				      image->arch.elf_headers_sz);
 		if (ret) {
 			pr_err("Error reserving elfcorehdr memory: %s\n",
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index c69bcf9b547a..a05c19b3cc60 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -815,7 +815,7 @@ static int load_elfcorehdr_segment(struct kimage *image, struct kexec_buf *kbuf)
 		goto out;
 	}
 
-	image->arch.elfcorehdr_addr = kbuf->mem;
+	image->arch.elf_headers_mem = kbuf->mem;
 	image->arch.elf_headers_sz = headers_sz;
 	image->arch.elf_headers = headers;
 out:
@@ -851,7 +851,7 @@ int load_crashdump_segments_ppc64(struct kimage *image,
 		return ret;
 	}
 	pr_debug("Loaded elf core header at 0x%lx, bufsz=0x%lx memsz=0x%lx\n",
-		 image->arch.elfcorehdr_addr, kbuf->bufsz, kbuf->memsz);
+		 image->arch.elf_headers_mem, kbuf->bufsz, kbuf->memsz);
 
 	return 0;
 }
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 01/12] powerpc: Rename kexec elfcorehdr_addr to elf_headers_mem
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The architecture specific field, elfcorehdr_addr in struct kimage_arch,
that holds the address of the buffer in memory for ELF core header for
powerpc has a different name than the one used for arm64.  This makes
it hard to have a common code for setting up the device tree for
kexec system call.

Rename elfcorehdr_addr to elf_headers_mem to align with arm64 name so
common code can use it.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/include/asm/kexec.h  | 2 +-
 arch/powerpc/kexec/file_load.c    | 4 ++--
 arch/powerpc/kexec/file_load_64.c | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 55d6ede30c19..dbf09d2f36d0 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -108,7 +108,7 @@ struct kimage_arch {
 	unsigned long backup_start;
 	void *backup_buf;
 
-	unsigned long elfcorehdr_addr;
+	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
 
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 9a232bc36c8f..e452b11df631 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -45,7 +45,7 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 		return NULL;
 
 	elfcorehdr_strlen = sprintf(cmdline_ptr, "elfcorehdr=0x%lx ",
-				    image->arch.elfcorehdr_addr);
+				    image->arch.elf_headers_mem);
 
 	if (elfcorehdr_strlen + cmdline_len > COMMAND_LINE_SIZE) {
 		pr_err("Appending elfcorehdr=<addr> exceeds cmdline size\n");
@@ -263,7 +263,7 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		 * Avoid elfcorehdr from being stomped on in kdump kernel by
 		 * setting up memory reserve map.
 		 */
-		ret = fdt_add_mem_rsv(fdt, image->arch.elfcorehdr_addr,
+		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
 				      image->arch.elf_headers_sz);
 		if (ret) {
 			pr_err("Error reserving elfcorehdr memory: %s\n",
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index c69bcf9b547a..a05c19b3cc60 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -815,7 +815,7 @@ static int load_elfcorehdr_segment(struct kimage *image, struct kexec_buf *kbuf)
 		goto out;
 	}
 
-	image->arch.elfcorehdr_addr = kbuf->mem;
+	image->arch.elf_headers_mem = kbuf->mem;
 	image->arch.elf_headers_sz = headers_sz;
 	image->arch.elf_headers = headers;
 out:
@@ -851,7 +851,7 @@ int load_crashdump_segments_ppc64(struct kimage *image,
 		return ret;
 	}
 	pr_debug("Loaded elf core header at 0x%lx, bufsz=0x%lx memsz=0x%lx\n",
-		 image->arch.elfcorehdr_addr, kbuf->bufsz, kbuf->memsz);
+		 image->arch.elf_headers_mem, kbuf->bufsz, kbuf->memsz);
 
 	return 0;
 }
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 01/12] powerpc: Rename kexec elfcorehdr_addr to elf_headers_mem
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The architecture specific field, elfcorehdr_addr in struct kimage_arch,
that holds the address of the buffer in memory for ELF core header for
powerpc has a different name than the one used for arm64.  This makes
it hard to have a common code for setting up the device tree for
kexec system call.

Rename elfcorehdr_addr to elf_headers_mem to align with arm64 name so
common code can use it.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/include/asm/kexec.h  | 2 +-
 arch/powerpc/kexec/file_load.c    | 4 ++--
 arch/powerpc/kexec/file_load_64.c | 4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 55d6ede30c19..dbf09d2f36d0 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -108,7 +108,7 @@ struct kimage_arch {
 	unsigned long backup_start;
 	void *backup_buf;
 
-	unsigned long elfcorehdr_addr;
+	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
 
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 9a232bc36c8f..e452b11df631 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -45,7 +45,7 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 		return NULL;
 
 	elfcorehdr_strlen = sprintf(cmdline_ptr, "elfcorehdr=0x%lx ",
-				    image->arch.elfcorehdr_addr);
+				    image->arch.elf_headers_mem);
 
 	if (elfcorehdr_strlen + cmdline_len > COMMAND_LINE_SIZE) {
 		pr_err("Appending elfcorehdr=<addr> exceeds cmdline size\n");
@@ -263,7 +263,7 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		 * Avoid elfcorehdr from being stomped on in kdump kernel by
 		 * setting up memory reserve map.
 		 */
-		ret = fdt_add_mem_rsv(fdt, image->arch.elfcorehdr_addr,
+		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
 				      image->arch.elf_headers_sz);
 		if (ret) {
 			pr_err("Error reserving elfcorehdr memory: %s\n",
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index c69bcf9b547a..a05c19b3cc60 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -815,7 +815,7 @@ static int load_elfcorehdr_segment(struct kimage *image, struct kexec_buf *kbuf)
 		goto out;
 	}
 
-	image->arch.elfcorehdr_addr = kbuf->mem;
+	image->arch.elf_headers_mem = kbuf->mem;
 	image->arch.elf_headers_sz = headers_sz;
 	image->arch.elf_headers = headers;
 out:
@@ -851,7 +851,7 @@ int load_crashdump_segments_ppc64(struct kimage *image,
 		return ret;
 	}
 	pr_debug("Loaded elf core header at 0x%lx, bufsz=0x%lx memsz=0x%lx\n",
-		 image->arch.elfcorehdr_addr, kbuf->bufsz, kbuf->memsz);
+		 image->arch.elf_headers_mem, kbuf->bufsz, kbuf->memsz);
 
 	return 0;
 }
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 02/12] of: Add a common kexec FDT setup function
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

From: Rob Herring <robh@kernel.org>

Both arm64 and powerpc do essentially the same FDT /chosen setup for
kexec.  The differences are either omissions that arm64 should have
or additional properties that will be ignored.  The setup code can be
combined and shared by both powerpc and arm64.

The differences relative to the arm64 version:
 - If /chosen doesn't exist, it will be created (should never happen).
 - Any old dtb and initrd reserved memory will be released.
 - The new initrd and elfcorehdr are marked reserved.
 - "linux,booted-from-kexec" is set.

The differences relative to the powerpc version:
 - "kaslr-seed" and "rng-seed" may be set.
 - "linux,elfcorehdr" is set.
 - Any existing "linux,usable-memory-range" is removed.

Combine the code for setting up the /chosen node in the FDT and updating
the memory reservation for kexec, for powerpc and arm64, in
of_kexec_setup_new_fdt() and move it to "drivers/of/kexec.c".

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 drivers/of/Makefile |   1 +
 drivers/of/kexec.c  | 236 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of.h  |   4 +
 3 files changed, 241 insertions(+)
 create mode 100644 drivers/of/kexec.c

diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 6e1e5212f058..8ce11955afde 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -13,5 +13,6 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
 obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
 obj-$(CONFIG_OF_NUMA) += of_numa.o
+obj-$(CONFIG_KEXEC_FILE) += kexec.o
 
 obj-$(CONFIG_OF_UNITTEST) += unittest-data/
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
new file mode 100644
index 000000000000..4afd3cc1c04a
--- /dev/null
+++ b/drivers/of/kexec.c
@@ -0,0 +1,236 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Arm Limited
+ *
+ * Based on arch/arm64/kernel/machine_kexec_file.c:
+ *  Copyright (C) 2018 Linaro Limited
+ *
+ * And arch/powerpc/kexec/file_load.c:
+ *  Copyright (C) 2016  IBM Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/libfdt.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/random.h>
+#include <linux/types.h>
+
+/* relevant device tree properties */
+#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
+#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
+#define FDT_PROP_INITRD_START	"linux,initrd-start"
+#define FDT_PROP_INITRD_END	"linux,initrd-end"
+#define FDT_PROP_BOOTARGS	"bootargs"
+#define FDT_PROP_KASLR_SEED	"kaslr-seed"
+#define FDT_PROP_RNG_SEED	"rng-seed"
+#define RNG_SEED_SIZE		128
+
+/**
+ * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
+ *
+ * @fdt:	Flattened device tree for the current kernel.
+ * @start:	Starting address of the reserved memory.
+ * @size:	Size of the reserved memory.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned long size)
+{
+	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
+
+	for (i = 0; i < num_rsvs; i++) {
+		u64 rsv_start, rsv_size;
+
+		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
+		if (ret) {
+			pr_err("Malformed device tree.\n");
+			return -EINVAL;
+		}
+
+		if (rsv_start == start && rsv_size == size) {
+			ret = fdt_del_mem_rsv(fdt, i);
+			if (ret) {
+				pr_err("Error deleting device tree reservation.\n");
+				return -EINVAL;
+			}
+
+			return 0;
+		}
+	}
+
+	return -ENOENT;
+}
+
+/*
+ * of_kexec_setup_new_fdt - modify /chosen and memory reservation for the next kernel
+ *
+ * @image:		kexec image being loaded.
+ * @fdt:		Flattened device tree for the next kernel.
+ * @initrd_load_addr:	Address where the next initrd will be loaded.
+ * @initrd_len:		Size of the next initrd, or 0 if there will be none.
+ * @cmdline:		Command line for the next kernel, or NULL if there will
+ *			be none.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
+			   unsigned long initrd_load_addr, unsigned long initrd_len,
+			   const char *cmdline)
+{
+	int ret, chosen_node;
+	const void *prop;
+
+	/* Remove memory reservation for the current device tree. */
+	ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
+				       fdt_totalsize(initial_boot_params));
+	if (ret == -EINVAL)
+		return ret;
+
+	chosen_node = fdt_path_offset(fdt, "/chosen");
+	if (chosen_node == -FDT_ERR_NOTFOUND)
+		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
+					      "chosen");
+	if (chosen_node < 0) {
+		ret = chosen_node;
+		goto out;
+	}
+
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KEXEC_ELFHDR);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_MEM_RANGE);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+
+	/* Did we boot using an initrd? */
+	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
+	if (prop) {
+		u64 tmp_start, tmp_end, tmp_size;
+
+		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
+		if (!prop)
+			return -EINVAL;
+
+		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		/*
+		 * kexec reserves exact initrd size, while firmware may
+		 * reserve a multiple of PAGE_SIZE, so check for both.
+		 */
+		tmp_size = tmp_end - tmp_start;
+		ret = fdt_find_and_del_mem_rsv(fdt, tmp_start, tmp_size);
+		if (ret == -ENOENT)
+			ret = fdt_find_and_del_mem_rsv(fdt, tmp_start,
+						       round_up(tmp_size, PAGE_SIZE));
+		if (ret == -EINVAL)
+			return ret;
+	}
+
+	/* add initrd-* */
+	if (initrd_load_addr) {
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_START,
+				      initrd_load_addr);
+		if (ret)
+			goto out;
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_END,
+				      initrd_load_addr + initrd_len);
+		if (ret)
+			goto out;
+
+		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
+		if (ret)
+			goto out;
+
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_START);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_END);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	if (image->type == KEXEC_TYPE_CRASH) {
+		/* add linux,elfcorehdr */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_KEXEC_ELFHDR,
+				image->arch.elf_headers_mem,
+				image->arch.elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/*
+		 * Avoid elfcorehdr from being stomped on in kdump kernel by
+		 * setting up memory reserve map.
+		 */
+		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
+				      image->arch.elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/* add linux,usable-memory-range */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_MEM_RANGE,
+				crashk_res.start,
+				crashk_res.end - crashk_res.start + 1);
+		if (ret)
+			goto out;
+	}
+
+	/* add bootargs */
+	if (cmdline) {
+		ret = fdt_setprop_string(fdt, chosen_node, FDT_PROP_BOOTARGS, cmdline);
+		if (ret)
+			goto out;
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_BOOTARGS);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	/* add kaslr-seed */
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KASLR_SEED);
+	if (ret == -FDT_ERR_NOTFOUND)
+		ret = 0;
+	else if (ret)
+		goto out;
+
+	if (rng_is_initialized()) {
+		u64 seed = get_random_u64();
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_KASLR_SEED, seed);
+		if (ret)
+			goto out;
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_KASLR_SEED);
+	}
+
+	/* add rng-seed */
+	if (rng_is_initialized()) {
+		void *rng_seed;
+
+		ret = fdt_setprop_placeholder(fdt, chosen_node, FDT_PROP_RNG_SEED,
+				RNG_SEED_SIZE, &rng_seed);
+		if (ret)
+			goto out;
+		get_random_bytes(rng_seed, RNG_SEED_SIZE);
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_RNG_SEED);
+	}
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+
+out:
+	if (ret)
+		return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
+
+	return 0;
+}
diff --git a/include/linux/of.h b/include/linux/of.h
index 4b27c9a27df3..41e256adf758 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -559,6 +559,10 @@ int of_map_id(struct device_node *np, u32 id,
 	       struct device_node **target, u32 *id_out);
 
 phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
+struct kimage;
+int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
+			   unsigned long initrd_load_addr, unsigned long initrd_len,
+			   const char *cmdline);
 
 #else /* CONFIG_OF */
 
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 02/12] of: Add a common kexec FDT setup function
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

From: Rob Herring <robh@kernel.org>

Both arm64 and powerpc do essentially the same FDT /chosen setup for
kexec.  The differences are either omissions that arm64 should have
or additional properties that will be ignored.  The setup code can be
combined and shared by both powerpc and arm64.

The differences relative to the arm64 version:
 - If /chosen doesn't exist, it will be created (should never happen).
 - Any old dtb and initrd reserved memory will be released.
 - The new initrd and elfcorehdr are marked reserved.
 - "linux,booted-from-kexec" is set.

The differences relative to the powerpc version:
 - "kaslr-seed" and "rng-seed" may be set.
 - "linux,elfcorehdr" is set.
 - Any existing "linux,usable-memory-range" is removed.

Combine the code for setting up the /chosen node in the FDT and updating
the memory reservation for kexec, for powerpc and arm64, in
of_kexec_setup_new_fdt() and move it to "drivers/of/kexec.c".

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 drivers/of/Makefile |   1 +
 drivers/of/kexec.c  | 236 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of.h  |   4 +
 3 files changed, 241 insertions(+)
 create mode 100644 drivers/of/kexec.c

diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 6e1e5212f058..8ce11955afde 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -13,5 +13,6 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
 obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
 obj-$(CONFIG_OF_NUMA) += of_numa.o
+obj-$(CONFIG_KEXEC_FILE) += kexec.o
 
 obj-$(CONFIG_OF_UNITTEST) += unittest-data/
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
new file mode 100644
index 000000000000..4afd3cc1c04a
--- /dev/null
+++ b/drivers/of/kexec.c
@@ -0,0 +1,236 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Arm Limited
+ *
+ * Based on arch/arm64/kernel/machine_kexec_file.c:
+ *  Copyright (C) 2018 Linaro Limited
+ *
+ * And arch/powerpc/kexec/file_load.c:
+ *  Copyright (C) 2016  IBM Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/libfdt.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/random.h>
+#include <linux/types.h>
+
+/* relevant device tree properties */
+#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
+#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
+#define FDT_PROP_INITRD_START	"linux,initrd-start"
+#define FDT_PROP_INITRD_END	"linux,initrd-end"
+#define FDT_PROP_BOOTARGS	"bootargs"
+#define FDT_PROP_KASLR_SEED	"kaslr-seed"
+#define FDT_PROP_RNG_SEED	"rng-seed"
+#define RNG_SEED_SIZE		128
+
+/**
+ * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
+ *
+ * @fdt:	Flattened device tree for the current kernel.
+ * @start:	Starting address of the reserved memory.
+ * @size:	Size of the reserved memory.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned long size)
+{
+	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
+
+	for (i = 0; i < num_rsvs; i++) {
+		u64 rsv_start, rsv_size;
+
+		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
+		if (ret) {
+			pr_err("Malformed device tree.\n");
+			return -EINVAL;
+		}
+
+		if (rsv_start == start && rsv_size == size) {
+			ret = fdt_del_mem_rsv(fdt, i);
+			if (ret) {
+				pr_err("Error deleting device tree reservation.\n");
+				return -EINVAL;
+			}
+
+			return 0;
+		}
+	}
+
+	return -ENOENT;
+}
+
+/*
+ * of_kexec_setup_new_fdt - modify /chosen and memory reservation for the next kernel
+ *
+ * @image:		kexec image being loaded.
+ * @fdt:		Flattened device tree for the next kernel.
+ * @initrd_load_addr:	Address where the next initrd will be loaded.
+ * @initrd_len:		Size of the next initrd, or 0 if there will be none.
+ * @cmdline:		Command line for the next kernel, or NULL if there will
+ *			be none.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
+			   unsigned long initrd_load_addr, unsigned long initrd_len,
+			   const char *cmdline)
+{
+	int ret, chosen_node;
+	const void *prop;
+
+	/* Remove memory reservation for the current device tree. */
+	ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
+				       fdt_totalsize(initial_boot_params));
+	if (ret == -EINVAL)
+		return ret;
+
+	chosen_node = fdt_path_offset(fdt, "/chosen");
+	if (chosen_node == -FDT_ERR_NOTFOUND)
+		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
+					      "chosen");
+	if (chosen_node < 0) {
+		ret = chosen_node;
+		goto out;
+	}
+
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KEXEC_ELFHDR);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_MEM_RANGE);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+
+	/* Did we boot using an initrd? */
+	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
+	if (prop) {
+		u64 tmp_start, tmp_end, tmp_size;
+
+		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
+		if (!prop)
+			return -EINVAL;
+
+		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		/*
+		 * kexec reserves exact initrd size, while firmware may
+		 * reserve a multiple of PAGE_SIZE, so check for both.
+		 */
+		tmp_size = tmp_end - tmp_start;
+		ret = fdt_find_and_del_mem_rsv(fdt, tmp_start, tmp_size);
+		if (ret == -ENOENT)
+			ret = fdt_find_and_del_mem_rsv(fdt, tmp_start,
+						       round_up(tmp_size, PAGE_SIZE));
+		if (ret == -EINVAL)
+			return ret;
+	}
+
+	/* add initrd-* */
+	if (initrd_load_addr) {
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_START,
+				      initrd_load_addr);
+		if (ret)
+			goto out;
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_END,
+				      initrd_load_addr + initrd_len);
+		if (ret)
+			goto out;
+
+		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
+		if (ret)
+			goto out;
+
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_START);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_END);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	if (image->type == KEXEC_TYPE_CRASH) {
+		/* add linux,elfcorehdr */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_KEXEC_ELFHDR,
+				image->arch.elf_headers_mem,
+				image->arch.elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/*
+		 * Avoid elfcorehdr from being stomped on in kdump kernel by
+		 * setting up memory reserve map.
+		 */
+		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
+				      image->arch.elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/* add linux,usable-memory-range */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_MEM_RANGE,
+				crashk_res.start,
+				crashk_res.end - crashk_res.start + 1);
+		if (ret)
+			goto out;
+	}
+
+	/* add bootargs */
+	if (cmdline) {
+		ret = fdt_setprop_string(fdt, chosen_node, FDT_PROP_BOOTARGS, cmdline);
+		if (ret)
+			goto out;
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_BOOTARGS);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	/* add kaslr-seed */
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KASLR_SEED);
+	if (ret == -FDT_ERR_NOTFOUND)
+		ret = 0;
+	else if (ret)
+		goto out;
+
+	if (rng_is_initialized()) {
+		u64 seed = get_random_u64();
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_KASLR_SEED, seed);
+		if (ret)
+			goto out;
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_KASLR_SEED);
+	}
+
+	/* add rng-seed */
+	if (rng_is_initialized()) {
+		void *rng_seed;
+
+		ret = fdt_setprop_placeholder(fdt, chosen_node, FDT_PROP_RNG_SEED,
+				RNG_SEED_SIZE, &rng_seed);
+		if (ret)
+			goto out;
+		get_random_bytes(rng_seed, RNG_SEED_SIZE);
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_RNG_SEED);
+	}
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+
+out:
+	if (ret)
+		return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
+
+	return 0;
+}
diff --git a/include/linux/of.h b/include/linux/of.h
index 4b27c9a27df3..41e256adf758 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -559,6 +559,10 @@ int of_map_id(struct device_node *np, u32 id,
 	       struct device_node **target, u32 *id_out);
 
 phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
+struct kimage;
+int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
+			   unsigned long initrd_load_addr, unsigned long initrd_len,
+			   const char *cmdline);
 
 #else /* CONFIG_OF */
 
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 02/12] of: Add a common kexec FDT setup function
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

From: Rob Herring <robh@kernel.org>

Both arm64 and powerpc do essentially the same FDT /chosen setup for
kexec.  The differences are either omissions that arm64 should have
or additional properties that will be ignored.  The setup code can be
combined and shared by both powerpc and arm64.

The differences relative to the arm64 version:
 - If /chosen doesn't exist, it will be created (should never happen).
 - Any old dtb and initrd reserved memory will be released.
 - The new initrd and elfcorehdr are marked reserved.
 - "linux,booted-from-kexec" is set.

The differences relative to the powerpc version:
 - "kaslr-seed" and "rng-seed" may be set.
 - "linux,elfcorehdr" is set.
 - Any existing "linux,usable-memory-range" is removed.

Combine the code for setting up the /chosen node in the FDT and updating
the memory reservation for kexec, for powerpc and arm64, in
of_kexec_setup_new_fdt() and move it to "drivers/of/kexec.c".

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 drivers/of/Makefile |   1 +
 drivers/of/kexec.c  | 236 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of.h  |   4 +
 3 files changed, 241 insertions(+)
 create mode 100644 drivers/of/kexec.c

diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index 6e1e5212f058..8ce11955afde 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -13,5 +13,6 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
 obj-$(CONFIG_OF_RESOLVE)  += resolver.o
 obj-$(CONFIG_OF_OVERLAY) += overlay.o
 obj-$(CONFIG_OF_NUMA) += of_numa.o
+obj-$(CONFIG_KEXEC_FILE) += kexec.o
 
 obj-$(CONFIG_OF_UNITTEST) += unittest-data/
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
new file mode 100644
index 000000000000..4afd3cc1c04a
--- /dev/null
+++ b/drivers/of/kexec.c
@@ -0,0 +1,236 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Arm Limited
+ *
+ * Based on arch/arm64/kernel/machine_kexec_file.c:
+ *  Copyright (C) 2018 Linaro Limited
+ *
+ * And arch/powerpc/kexec/file_load.c:
+ *  Copyright (C) 2016  IBM Corporation
+ */
+
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/libfdt.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/random.h>
+#include <linux/types.h>
+
+/* relevant device tree properties */
+#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
+#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
+#define FDT_PROP_INITRD_START	"linux,initrd-start"
+#define FDT_PROP_INITRD_END	"linux,initrd-end"
+#define FDT_PROP_BOOTARGS	"bootargs"
+#define FDT_PROP_KASLR_SEED	"kaslr-seed"
+#define FDT_PROP_RNG_SEED	"rng-seed"
+#define RNG_SEED_SIZE		128
+
+/**
+ * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
+ *
+ * @fdt:	Flattened device tree for the current kernel.
+ * @start:	Starting address of the reserved memory.
+ * @size:	Size of the reserved memory.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned long size)
+{
+	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
+
+	for (i = 0; i < num_rsvs; i++) {
+		u64 rsv_start, rsv_size;
+
+		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
+		if (ret) {
+			pr_err("Malformed device tree.\n");
+			return -EINVAL;
+		}
+
+		if (rsv_start == start && rsv_size == size) {
+			ret = fdt_del_mem_rsv(fdt, i);
+			if (ret) {
+				pr_err("Error deleting device tree reservation.\n");
+				return -EINVAL;
+			}
+
+			return 0;
+		}
+	}
+
+	return -ENOENT;
+}
+
+/*
+ * of_kexec_setup_new_fdt - modify /chosen and memory reservation for the next kernel
+ *
+ * @image:		kexec image being loaded.
+ * @fdt:		Flattened device tree for the next kernel.
+ * @initrd_load_addr:	Address where the next initrd will be loaded.
+ * @initrd_len:		Size of the next initrd, or 0 if there will be none.
+ * @cmdline:		Command line for the next kernel, or NULL if there will
+ *			be none.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
+			   unsigned long initrd_load_addr, unsigned long initrd_len,
+			   const char *cmdline)
+{
+	int ret, chosen_node;
+	const void *prop;
+
+	/* Remove memory reservation for the current device tree. */
+	ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
+				       fdt_totalsize(initial_boot_params));
+	if (ret == -EINVAL)
+		return ret;
+
+	chosen_node = fdt_path_offset(fdt, "/chosen");
+	if (chosen_node == -FDT_ERR_NOTFOUND)
+		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
+					      "chosen");
+	if (chosen_node < 0) {
+		ret = chosen_node;
+		goto out;
+	}
+
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KEXEC_ELFHDR);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_MEM_RANGE);
+	if (ret && ret != -FDT_ERR_NOTFOUND)
+		goto out;
+
+	/* Did we boot using an initrd? */
+	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
+	if (prop) {
+		u64 tmp_start, tmp_end, tmp_size;
+
+		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
+		if (!prop)
+			return -EINVAL;
+
+		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
+
+		/*
+		 * kexec reserves exact initrd size, while firmware may
+		 * reserve a multiple of PAGE_SIZE, so check for both.
+		 */
+		tmp_size = tmp_end - tmp_start;
+		ret = fdt_find_and_del_mem_rsv(fdt, tmp_start, tmp_size);
+		if (ret == -ENOENT)
+			ret = fdt_find_and_del_mem_rsv(fdt, tmp_start,
+						       round_up(tmp_size, PAGE_SIZE));
+		if (ret == -EINVAL)
+			return ret;
+	}
+
+	/* add initrd-* */
+	if (initrd_load_addr) {
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_START,
+				      initrd_load_addr);
+		if (ret)
+			goto out;
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_INITRD_END,
+				      initrd_load_addr + initrd_len);
+		if (ret)
+			goto out;
+
+		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
+		if (ret)
+			goto out;
+
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_START);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_INITRD_END);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	if (image->type == KEXEC_TYPE_CRASH) {
+		/* add linux,elfcorehdr */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_KEXEC_ELFHDR,
+				image->arch.elf_headers_mem,
+				image->arch.elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/*
+		 * Avoid elfcorehdr from being stomped on in kdump kernel by
+		 * setting up memory reserve map.
+		 */
+		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
+				      image->arch.elf_headers_sz);
+		if (ret)
+			goto out;
+
+		/* add linux,usable-memory-range */
+		ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				FDT_PROP_MEM_RANGE,
+				crashk_res.start,
+				crashk_res.end - crashk_res.start + 1);
+		if (ret)
+			goto out;
+	}
+
+	/* add bootargs */
+	if (cmdline) {
+		ret = fdt_setprop_string(fdt, chosen_node, FDT_PROP_BOOTARGS, cmdline);
+		if (ret)
+			goto out;
+	} else {
+		ret = fdt_delprop(fdt, chosen_node, FDT_PROP_BOOTARGS);
+		if (ret && (ret != -FDT_ERR_NOTFOUND))
+			goto out;
+	}
+
+	/* add kaslr-seed */
+	ret = fdt_delprop(fdt, chosen_node, FDT_PROP_KASLR_SEED);
+	if (ret == -FDT_ERR_NOTFOUND)
+		ret = 0;
+	else if (ret)
+		goto out;
+
+	if (rng_is_initialized()) {
+		u64 seed = get_random_u64();
+
+		ret = fdt_setprop_u64(fdt, chosen_node, FDT_PROP_KASLR_SEED, seed);
+		if (ret)
+			goto out;
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_KASLR_SEED);
+	}
+
+	/* add rng-seed */
+	if (rng_is_initialized()) {
+		void *rng_seed;
+
+		ret = fdt_setprop_placeholder(fdt, chosen_node, FDT_PROP_RNG_SEED,
+				RNG_SEED_SIZE, &rng_seed);
+		if (ret)
+			goto out;
+		get_random_bytes(rng_seed, RNG_SEED_SIZE);
+	} else {
+		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
+				FDT_PROP_RNG_SEED);
+	}
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+
+out:
+	if (ret)
+		return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
+
+	return 0;
+}
diff --git a/include/linux/of.h b/include/linux/of.h
index 4b27c9a27df3..41e256adf758 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -559,6 +559,10 @@ int of_map_id(struct device_node *np, u32 id,
 	       struct device_node **target, u32 *id_out);
 
 phys_addr_t of_dma_get_max_cpu_address(struct device_node *np);
+struct kimage;
+int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
+			   unsigned long initrd_load_addr, unsigned long initrd_len,
+			   const char *cmdline);
 
 #else /* CONFIG_OF */
 
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 03/12] arm64: Use common of_kexec_setup_new_fdt()
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The code for setting up the /chosen node in the device tree
and updating the memory reservation for the next kernel has been
moved to of_kexec_setup_new_fdt() defined in "drivers/of/kexec.c".

Use the common of_kexec_setup_new_fdt() to setup the device tree
and update the memory reservation for kexec for arm64.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Acked-by: Will Deacon <will@kernel.org>
---
 arch/arm64/kernel/machine_kexec_file.c | 123 +------------------------
 1 file changed, 3 insertions(+), 120 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 03210f644790..7da22bb7b9d5 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -15,23 +15,12 @@
 #include <linux/kexec.h>
 #include <linux/libfdt.h>
 #include <linux/memblock.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
-#include <linux/random.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/vmalloc.h>
-#include <asm/byteorder.h>
-
-/* relevant device tree properties */
-#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
-#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
-#define FDT_PROP_INITRD_START	"linux,initrd-start"
-#define FDT_PROP_INITRD_END	"linux,initrd-end"
-#define FDT_PROP_BOOTARGS	"bootargs"
-#define FDT_PROP_KASLR_SEED	"kaslr-seed"
-#define FDT_PROP_RNG_SEED	"rng-seed"
-#define RNG_SEED_SIZE		128
 
 const struct kexec_file_ops * const kexec_file_loaders[] = {
 	&kexec_image_ops,
@@ -50,112 +39,6 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	return kexec_image_post_load_cleanup_default(image);
 }
 
-static int setup_dtb(struct kimage *image,
-		     unsigned long initrd_load_addr, unsigned long initrd_len,
-		     char *cmdline, void *dtb)
-{
-	int off, ret;
-
-	ret = fdt_path_offset(dtb, "/chosen");
-	if (ret < 0)
-		goto out;
-
-	off = ret;
-
-	ret = fdt_delprop(dtb, off, FDT_PROP_KEXEC_ELFHDR);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		goto out;
-	ret = fdt_delprop(dtb, off, FDT_PROP_MEM_RANGE);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		goto out;
-
-	if (image->type == KEXEC_TYPE_CRASH) {
-		/* add linux,elfcorehdr */
-		ret = fdt_appendprop_addrrange(dtb, 0, off,
-				FDT_PROP_KEXEC_ELFHDR,
-				image->arch.elf_headers_mem,
-				image->arch.elf_headers_sz);
-		if (ret)
-			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
-
-		/* add linux,usable-memory-range */
-		ret = fdt_appendprop_addrrange(dtb, 0, off,
-				FDT_PROP_MEM_RANGE,
-				crashk_res.start,
-				crashk_res.end - crashk_res.start + 1);
-		if (ret)
-			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
-	}
-
-	/* add bootargs */
-	if (cmdline) {
-		ret = fdt_setprop_string(dtb, off, FDT_PROP_BOOTARGS, cmdline);
-		if (ret)
-			goto out;
-	} else {
-		ret = fdt_delprop(dtb, off, FDT_PROP_BOOTARGS);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-	}
-
-	/* add initrd-* */
-	if (initrd_load_addr) {
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_START,
-				      initrd_load_addr);
-		if (ret)
-			goto out;
-
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_END,
-				      initrd_load_addr + initrd_len);
-		if (ret)
-			goto out;
-	} else {
-		ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_START);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-
-		ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_END);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-	}
-
-	/* add kaslr-seed */
-	ret = fdt_delprop(dtb, off, FDT_PROP_KASLR_SEED);
-	if (ret == -FDT_ERR_NOTFOUND)
-		ret = 0;
-	else if (ret)
-		goto out;
-
-	if (rng_is_initialized()) {
-		u64 seed = get_random_u64();
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_KASLR_SEED, seed);
-		if (ret)
-			goto out;
-	} else {
-		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
-				FDT_PROP_KASLR_SEED);
-	}
-
-	/* add rng-seed */
-	if (rng_is_initialized()) {
-		void *rng_seed;
-		ret = fdt_setprop_placeholder(dtb, off, FDT_PROP_RNG_SEED,
-				RNG_SEED_SIZE, &rng_seed);
-		if (ret)
-			goto out;
-		get_random_bytes(rng_seed, RNG_SEED_SIZE);
-	} else {
-		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
-				FDT_PROP_RNG_SEED);
-	}
-
-out:
-	if (ret)
-		return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
-
-	return 0;
-}
-
 /*
  * More space needed so that we can add initrd, bootargs, kaslr-seed,
  * rng-seed, userable-memory-range and elfcorehdr.
@@ -185,8 +68,8 @@ static int create_dtb(struct kimage *image,
 		if (ret)
 			return -EINVAL;
 
-		ret = setup_dtb(image, initrd_load_addr, initrd_len,
-				cmdline, buf);
+		ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
+					     initrd_len, cmdline);
 		if (ret) {
 			vfree(buf);
 			if (ret == -ENOMEM) {
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 03/12] arm64: Use common of_kexec_setup_new_fdt()
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The code for setting up the /chosen node in the device tree
and updating the memory reservation for the next kernel has been
moved to of_kexec_setup_new_fdt() defined in "drivers/of/kexec.c".

Use the common of_kexec_setup_new_fdt() to setup the device tree
and update the memory reservation for kexec for arm64.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Acked-by: Will Deacon <will@kernel.org>
---
 arch/arm64/kernel/machine_kexec_file.c | 123 +------------------------
 1 file changed, 3 insertions(+), 120 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 03210f644790..7da22bb7b9d5 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -15,23 +15,12 @@
 #include <linux/kexec.h>
 #include <linux/libfdt.h>
 #include <linux/memblock.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
-#include <linux/random.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/vmalloc.h>
-#include <asm/byteorder.h>
-
-/* relevant device tree properties */
-#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
-#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
-#define FDT_PROP_INITRD_START	"linux,initrd-start"
-#define FDT_PROP_INITRD_END	"linux,initrd-end"
-#define FDT_PROP_BOOTARGS	"bootargs"
-#define FDT_PROP_KASLR_SEED	"kaslr-seed"
-#define FDT_PROP_RNG_SEED	"rng-seed"
-#define RNG_SEED_SIZE		128
 
 const struct kexec_file_ops * const kexec_file_loaders[] = {
 	&kexec_image_ops,
@@ -50,112 +39,6 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	return kexec_image_post_load_cleanup_default(image);
 }
 
-static int setup_dtb(struct kimage *image,
-		     unsigned long initrd_load_addr, unsigned long initrd_len,
-		     char *cmdline, void *dtb)
-{
-	int off, ret;
-
-	ret = fdt_path_offset(dtb, "/chosen");
-	if (ret < 0)
-		goto out;
-
-	off = ret;
-
-	ret = fdt_delprop(dtb, off, FDT_PROP_KEXEC_ELFHDR);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		goto out;
-	ret = fdt_delprop(dtb, off, FDT_PROP_MEM_RANGE);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		goto out;
-
-	if (image->type == KEXEC_TYPE_CRASH) {
-		/* add linux,elfcorehdr */
-		ret = fdt_appendprop_addrrange(dtb, 0, off,
-				FDT_PROP_KEXEC_ELFHDR,
-				image->arch.elf_headers_mem,
-				image->arch.elf_headers_sz);
-		if (ret)
-			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
-
-		/* add linux,usable-memory-range */
-		ret = fdt_appendprop_addrrange(dtb, 0, off,
-				FDT_PROP_MEM_RANGE,
-				crashk_res.start,
-				crashk_res.end - crashk_res.start + 1);
-		if (ret)
-			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
-	}
-
-	/* add bootargs */
-	if (cmdline) {
-		ret = fdt_setprop_string(dtb, off, FDT_PROP_BOOTARGS, cmdline);
-		if (ret)
-			goto out;
-	} else {
-		ret = fdt_delprop(dtb, off, FDT_PROP_BOOTARGS);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-	}
-
-	/* add initrd-* */
-	if (initrd_load_addr) {
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_START,
-				      initrd_load_addr);
-		if (ret)
-			goto out;
-
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_END,
-				      initrd_load_addr + initrd_len);
-		if (ret)
-			goto out;
-	} else {
-		ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_START);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-
-		ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_END);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-	}
-
-	/* add kaslr-seed */
-	ret = fdt_delprop(dtb, off, FDT_PROP_KASLR_SEED);
-	if (ret == -FDT_ERR_NOTFOUND)
-		ret = 0;
-	else if (ret)
-		goto out;
-
-	if (rng_is_initialized()) {
-		u64 seed = get_random_u64();
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_KASLR_SEED, seed);
-		if (ret)
-			goto out;
-	} else {
-		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
-				FDT_PROP_KASLR_SEED);
-	}
-
-	/* add rng-seed */
-	if (rng_is_initialized()) {
-		void *rng_seed;
-		ret = fdt_setprop_placeholder(dtb, off, FDT_PROP_RNG_SEED,
-				RNG_SEED_SIZE, &rng_seed);
-		if (ret)
-			goto out;
-		get_random_bytes(rng_seed, RNG_SEED_SIZE);
-	} else {
-		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
-				FDT_PROP_RNG_SEED);
-	}
-
-out:
-	if (ret)
-		return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
-
-	return 0;
-}
-
 /*
  * More space needed so that we can add initrd, bootargs, kaslr-seed,
  * rng-seed, userable-memory-range and elfcorehdr.
@@ -185,8 +68,8 @@ static int create_dtb(struct kimage *image,
 		if (ret)
 			return -EINVAL;
 
-		ret = setup_dtb(image, initrd_load_addr, initrd_len,
-				cmdline, buf);
+		ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
+					     initrd_len, cmdline);
 		if (ret) {
 			vfree(buf);
 			if (ret == -ENOMEM) {
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 03/12] arm64: Use common of_kexec_setup_new_fdt()
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The code for setting up the /chosen node in the device tree
and updating the memory reservation for the next kernel has been
moved to of_kexec_setup_new_fdt() defined in "drivers/of/kexec.c".

Use the common of_kexec_setup_new_fdt() to setup the device tree
and update the memory reservation for kexec for arm64.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Acked-by: Will Deacon <will@kernel.org>
---
 arch/arm64/kernel/machine_kexec_file.c | 123 +------------------------
 1 file changed, 3 insertions(+), 120 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 03210f644790..7da22bb7b9d5 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -15,23 +15,12 @@
 #include <linux/kexec.h>
 #include <linux/libfdt.h>
 #include <linux/memblock.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
-#include <linux/random.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/vmalloc.h>
-#include <asm/byteorder.h>
-
-/* relevant device tree properties */
-#define FDT_PROP_KEXEC_ELFHDR	"linux,elfcorehdr"
-#define FDT_PROP_MEM_RANGE	"linux,usable-memory-range"
-#define FDT_PROP_INITRD_START	"linux,initrd-start"
-#define FDT_PROP_INITRD_END	"linux,initrd-end"
-#define FDT_PROP_BOOTARGS	"bootargs"
-#define FDT_PROP_KASLR_SEED	"kaslr-seed"
-#define FDT_PROP_RNG_SEED	"rng-seed"
-#define RNG_SEED_SIZE		128
 
 const struct kexec_file_ops * const kexec_file_loaders[] = {
 	&kexec_image_ops,
@@ -50,112 +39,6 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	return kexec_image_post_load_cleanup_default(image);
 }
 
-static int setup_dtb(struct kimage *image,
-		     unsigned long initrd_load_addr, unsigned long initrd_len,
-		     char *cmdline, void *dtb)
-{
-	int off, ret;
-
-	ret = fdt_path_offset(dtb, "/chosen");
-	if (ret < 0)
-		goto out;
-
-	off = ret;
-
-	ret = fdt_delprop(dtb, off, FDT_PROP_KEXEC_ELFHDR);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		goto out;
-	ret = fdt_delprop(dtb, off, FDT_PROP_MEM_RANGE);
-	if (ret && ret != -FDT_ERR_NOTFOUND)
-		goto out;
-
-	if (image->type == KEXEC_TYPE_CRASH) {
-		/* add linux,elfcorehdr */
-		ret = fdt_appendprop_addrrange(dtb, 0, off,
-				FDT_PROP_KEXEC_ELFHDR,
-				image->arch.elf_headers_mem,
-				image->arch.elf_headers_sz);
-		if (ret)
-			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
-
-		/* add linux,usable-memory-range */
-		ret = fdt_appendprop_addrrange(dtb, 0, off,
-				FDT_PROP_MEM_RANGE,
-				crashk_res.start,
-				crashk_res.end - crashk_res.start + 1);
-		if (ret)
-			return (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL);
-	}
-
-	/* add bootargs */
-	if (cmdline) {
-		ret = fdt_setprop_string(dtb, off, FDT_PROP_BOOTARGS, cmdline);
-		if (ret)
-			goto out;
-	} else {
-		ret = fdt_delprop(dtb, off, FDT_PROP_BOOTARGS);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-	}
-
-	/* add initrd-* */
-	if (initrd_load_addr) {
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_START,
-				      initrd_load_addr);
-		if (ret)
-			goto out;
-
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_INITRD_END,
-				      initrd_load_addr + initrd_len);
-		if (ret)
-			goto out;
-	} else {
-		ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_START);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-
-		ret = fdt_delprop(dtb, off, FDT_PROP_INITRD_END);
-		if (ret && (ret != -FDT_ERR_NOTFOUND))
-			goto out;
-	}
-
-	/* add kaslr-seed */
-	ret = fdt_delprop(dtb, off, FDT_PROP_KASLR_SEED);
-	if (ret == -FDT_ERR_NOTFOUND)
-		ret = 0;
-	else if (ret)
-		goto out;
-
-	if (rng_is_initialized()) {
-		u64 seed = get_random_u64();
-		ret = fdt_setprop_u64(dtb, off, FDT_PROP_KASLR_SEED, seed);
-		if (ret)
-			goto out;
-	} else {
-		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
-				FDT_PROP_KASLR_SEED);
-	}
-
-	/* add rng-seed */
-	if (rng_is_initialized()) {
-		void *rng_seed;
-		ret = fdt_setprop_placeholder(dtb, off, FDT_PROP_RNG_SEED,
-				RNG_SEED_SIZE, &rng_seed);
-		if (ret)
-			goto out;
-		get_random_bytes(rng_seed, RNG_SEED_SIZE);
-	} else {
-		pr_notice("RNG is not initialised: omitting \"%s\" property\n",
-				FDT_PROP_RNG_SEED);
-	}
-
-out:
-	if (ret)
-		return (ret == -FDT_ERR_NOSPACE) ? -ENOMEM : -EINVAL;
-
-	return 0;
-}
-
 /*
  * More space needed so that we can add initrd, bootargs, kaslr-seed,
  * rng-seed, userable-memory-range and elfcorehdr.
@@ -185,8 +68,8 @@ static int create_dtb(struct kimage *image,
 		if (ret)
 			return -EINVAL;
 
-		ret = setup_dtb(image, initrd_load_addr, initrd_len,
-				cmdline, buf);
+		ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
+					     initrd_len, cmdline);
 		if (ret) {
 			vfree(buf);
 			if (ret == -ENOMEM) {
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 04/12] powerpc: Use common of_kexec_setup_new_fdt()
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The code for setting up the /chosen node in the device tree
and updating the memory reservation for the next kernel has been
moved to of_kexec_setup_new_fdt() defined in "drivers/of/kexec.c".

Use the common of_kexec_setup_new_fdt() to setup the device tree
and update the memory reservation for kexec for powerpc.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/kexec/file_load.c | 125 ++-------------------------------
 1 file changed, 6 insertions(+), 119 deletions(-)

diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index e452b11df631..956bcb2d1ec2 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -16,6 +16,7 @@
 
 #include <linux/slab.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/setup.h>
@@ -156,132 +157,18 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		  unsigned long initrd_load_addr, unsigned long initrd_len,
 		  const char *cmdline)
 {
-	int ret, chosen_node;
-	const void *prop;
-
-	/* Remove memory reservation for the current device tree. */
-	ret = delete_fdt_mem_rsv(fdt, __pa(initial_boot_params),
-				 fdt_totalsize(initial_boot_params));
-	if (ret == 0)
-		pr_debug("Removed old device tree reservation.\n");
-	else if (ret != -ENOENT)
-		return ret;
-
-	chosen_node = fdt_path_offset(fdt, "/chosen");
-	if (chosen_node == -FDT_ERR_NOTFOUND) {
-		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
-					      "chosen");
-		if (chosen_node < 0) {
-			pr_err("Error creating /chosen.\n");
-			return -EINVAL;
-		}
-	} else if (chosen_node < 0) {
-		pr_err("Malformed device tree: error reading /chosen.\n");
-		return -EINVAL;
-	}
-
-	/* Did we boot using an initrd? */
-	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
-	if (prop) {
-		uint64_t tmp_start, tmp_end, tmp_size;
-
-		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
-
-		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
-		if (!prop) {
-			pr_err("Malformed device tree.\n");
-			return -EINVAL;
-		}
-		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
-
-		/*
-		 * kexec reserves exact initrd size, while firmware may
-		 * reserve a multiple of PAGE_SIZE, so check for both.
-		 */
-		tmp_size = tmp_end - tmp_start;
-		ret = delete_fdt_mem_rsv(fdt, tmp_start, tmp_size);
-		if (ret == -ENOENT)
-			ret = delete_fdt_mem_rsv(fdt, tmp_start,
-						 round_up(tmp_size, PAGE_SIZE));
-		if (ret == 0)
-			pr_debug("Removed old initrd reservation.\n");
-		else if (ret != -ENOENT)
-			return ret;
-
-		/* If there's no new initrd, delete the old initrd's info. */
-		if (initrd_len == 0) {
-			ret = fdt_delprop(fdt, chosen_node,
-					  "linux,initrd-start");
-			if (ret) {
-				pr_err("Error deleting linux,initrd-start.\n");
-				return -EINVAL;
-			}
-
-			ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");
-			if (ret) {
-				pr_err("Error deleting linux,initrd-end.\n");
-				return -EINVAL;
-			}
-		}
-	}
-
-	if (initrd_len) {
-		ret = fdt_setprop_u64(fdt, chosen_node,
-				      "linux,initrd-start",
-				      initrd_load_addr);
-		if (ret < 0)
-			goto err;
-
-		/* initrd-end is the first address after the initrd image. */
-		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
-				      initrd_load_addr + initrd_len);
-		if (ret < 0)
-			goto err;
-
-		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
-		if (ret) {
-			pr_err("Error reserving initrd memory: %s\n",
-			       fdt_strerror(ret));
-			return -EINVAL;
-		}
-	}
-
-	if (cmdline != NULL) {
-		ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
-		if (ret < 0)
-			goto err;
-	} else {
-		ret = fdt_delprop(fdt, chosen_node, "bootargs");
-		if (ret && ret != -FDT_ERR_NOTFOUND) {
-			pr_err("Error deleting bootargs.\n");
-			return -EINVAL;
-		}
-	}
+	int ret;
 
-	if (image->type == KEXEC_TYPE_CRASH) {
-		/*
-		 * Avoid elfcorehdr from being stomped on in kdump kernel by
-		 * setting up memory reserve map.
-		 */
-		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
-				      image->arch.elf_headers_sz);
-		if (ret) {
-			pr_err("Error reserving elfcorehdr memory: %s\n",
-			       fdt_strerror(ret));
-			goto err;
-		}
-	}
+	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
+	if (ret)
+		goto err;
 
-	ret = setup_ima_buffer(image, fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 	if (ret) {
 		pr_err("Error setting up the new device tree.\n");
 		return ret;
 	}
 
-	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
-	if (ret)
-		goto err;
-
 	return 0;
 
 err:
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 04/12] powerpc: Use common of_kexec_setup_new_fdt()
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The code for setting up the /chosen node in the device tree
and updating the memory reservation for the next kernel has been
moved to of_kexec_setup_new_fdt() defined in "drivers/of/kexec.c".

Use the common of_kexec_setup_new_fdt() to setup the device tree
and update the memory reservation for kexec for powerpc.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/kexec/file_load.c | 125 ++-------------------------------
 1 file changed, 6 insertions(+), 119 deletions(-)

diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index e452b11df631..956bcb2d1ec2 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -16,6 +16,7 @@
 
 #include <linux/slab.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/setup.h>
@@ -156,132 +157,18 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		  unsigned long initrd_load_addr, unsigned long initrd_len,
 		  const char *cmdline)
 {
-	int ret, chosen_node;
-	const void *prop;
-
-	/* Remove memory reservation for the current device tree. */
-	ret = delete_fdt_mem_rsv(fdt, __pa(initial_boot_params),
-				 fdt_totalsize(initial_boot_params));
-	if (ret == 0)
-		pr_debug("Removed old device tree reservation.\n");
-	else if (ret != -ENOENT)
-		return ret;
-
-	chosen_node = fdt_path_offset(fdt, "/chosen");
-	if (chosen_node == -FDT_ERR_NOTFOUND) {
-		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
-					      "chosen");
-		if (chosen_node < 0) {
-			pr_err("Error creating /chosen.\n");
-			return -EINVAL;
-		}
-	} else if (chosen_node < 0) {
-		pr_err("Malformed device tree: error reading /chosen.\n");
-		return -EINVAL;
-	}
-
-	/* Did we boot using an initrd? */
-	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
-	if (prop) {
-		uint64_t tmp_start, tmp_end, tmp_size;
-
-		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
-
-		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
-		if (!prop) {
-			pr_err("Malformed device tree.\n");
-			return -EINVAL;
-		}
-		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
-
-		/*
-		 * kexec reserves exact initrd size, while firmware may
-		 * reserve a multiple of PAGE_SIZE, so check for both.
-		 */
-		tmp_size = tmp_end - tmp_start;
-		ret = delete_fdt_mem_rsv(fdt, tmp_start, tmp_size);
-		if (ret == -ENOENT)
-			ret = delete_fdt_mem_rsv(fdt, tmp_start,
-						 round_up(tmp_size, PAGE_SIZE));
-		if (ret == 0)
-			pr_debug("Removed old initrd reservation.\n");
-		else if (ret != -ENOENT)
-			return ret;
-
-		/* If there's no new initrd, delete the old initrd's info. */
-		if (initrd_len == 0) {
-			ret = fdt_delprop(fdt, chosen_node,
-					  "linux,initrd-start");
-			if (ret) {
-				pr_err("Error deleting linux,initrd-start.\n");
-				return -EINVAL;
-			}
-
-			ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");
-			if (ret) {
-				pr_err("Error deleting linux,initrd-end.\n");
-				return -EINVAL;
-			}
-		}
-	}
-
-	if (initrd_len) {
-		ret = fdt_setprop_u64(fdt, chosen_node,
-				      "linux,initrd-start",
-				      initrd_load_addr);
-		if (ret < 0)
-			goto err;
-
-		/* initrd-end is the first address after the initrd image. */
-		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
-				      initrd_load_addr + initrd_len);
-		if (ret < 0)
-			goto err;
-
-		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
-		if (ret) {
-			pr_err("Error reserving initrd memory: %s\n",
-			       fdt_strerror(ret));
-			return -EINVAL;
-		}
-	}
-
-	if (cmdline != NULL) {
-		ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
-		if (ret < 0)
-			goto err;
-	} else {
-		ret = fdt_delprop(fdt, chosen_node, "bootargs");
-		if (ret && ret != -FDT_ERR_NOTFOUND) {
-			pr_err("Error deleting bootargs.\n");
-			return -EINVAL;
-		}
-	}
+	int ret;
 
-	if (image->type == KEXEC_TYPE_CRASH) {
-		/*
-		 * Avoid elfcorehdr from being stomped on in kdump kernel by
-		 * setting up memory reserve map.
-		 */
-		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
-				      image->arch.elf_headers_sz);
-		if (ret) {
-			pr_err("Error reserving elfcorehdr memory: %s\n",
-			       fdt_strerror(ret));
-			goto err;
-		}
-	}
+	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
+	if (ret)
+		goto err;
 
-	ret = setup_ima_buffer(image, fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 	if (ret) {
 		pr_err("Error setting up the new device tree.\n");
 		return ret;
 	}
 
-	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
-	if (ret)
-		goto err;
-
 	return 0;
 
 err:
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 04/12] powerpc: Use common of_kexec_setup_new_fdt()
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

From: Rob Herring <robh@kernel.org>

The code for setting up the /chosen node in the device tree
and updating the memory reservation for the next kernel has been
moved to of_kexec_setup_new_fdt() defined in "drivers/of/kexec.c".

Use the common of_kexec_setup_new_fdt() to setup the device tree
and update the memory reservation for kexec for powerpc.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/kexec/file_load.c | 125 ++-------------------------------
 1 file changed, 6 insertions(+), 119 deletions(-)

diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index e452b11df631..956bcb2d1ec2 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -16,6 +16,7 @@
 
 #include <linux/slab.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/setup.h>
@@ -156,132 +157,18 @@ int setup_new_fdt(const struct kimage *image, void *fdt,
 		  unsigned long initrd_load_addr, unsigned long initrd_len,
 		  const char *cmdline)
 {
-	int ret, chosen_node;
-	const void *prop;
-
-	/* Remove memory reservation for the current device tree. */
-	ret = delete_fdt_mem_rsv(fdt, __pa(initial_boot_params),
-				 fdt_totalsize(initial_boot_params));
-	if (ret == 0)
-		pr_debug("Removed old device tree reservation.\n");
-	else if (ret != -ENOENT)
-		return ret;
-
-	chosen_node = fdt_path_offset(fdt, "/chosen");
-	if (chosen_node == -FDT_ERR_NOTFOUND) {
-		chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"),
-					      "chosen");
-		if (chosen_node < 0) {
-			pr_err("Error creating /chosen.\n");
-			return -EINVAL;
-		}
-	} else if (chosen_node < 0) {
-		pr_err("Malformed device tree: error reading /chosen.\n");
-		return -EINVAL;
-	}
-
-	/* Did we boot using an initrd? */
-	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);
-	if (prop) {
-		uint64_t tmp_start, tmp_end, tmp_size;
-
-		tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop));
-
-		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);
-		if (!prop) {
-			pr_err("Malformed device tree.\n");
-			return -EINVAL;
-		}
-		tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop));
-
-		/*
-		 * kexec reserves exact initrd size, while firmware may
-		 * reserve a multiple of PAGE_SIZE, so check for both.
-		 */
-		tmp_size = tmp_end - tmp_start;
-		ret = delete_fdt_mem_rsv(fdt, tmp_start, tmp_size);
-		if (ret == -ENOENT)
-			ret = delete_fdt_mem_rsv(fdt, tmp_start,
-						 round_up(tmp_size, PAGE_SIZE));
-		if (ret == 0)
-			pr_debug("Removed old initrd reservation.\n");
-		else if (ret != -ENOENT)
-			return ret;
-
-		/* If there's no new initrd, delete the old initrd's info. */
-		if (initrd_len == 0) {
-			ret = fdt_delprop(fdt, chosen_node,
-					  "linux,initrd-start");
-			if (ret) {
-				pr_err("Error deleting linux,initrd-start.\n");
-				return -EINVAL;
-			}
-
-			ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");
-			if (ret) {
-				pr_err("Error deleting linux,initrd-end.\n");
-				return -EINVAL;
-			}
-		}
-	}
-
-	if (initrd_len) {
-		ret = fdt_setprop_u64(fdt, chosen_node,
-				      "linux,initrd-start",
-				      initrd_load_addr);
-		if (ret < 0)
-			goto err;
-
-		/* initrd-end is the first address after the initrd image. */
-		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",
-				      initrd_load_addr + initrd_len);
-		if (ret < 0)
-			goto err;
-
-		ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len);
-		if (ret) {
-			pr_err("Error reserving initrd memory: %s\n",
-			       fdt_strerror(ret));
-			return -EINVAL;
-		}
-	}
-
-	if (cmdline != NULL) {
-		ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline);
-		if (ret < 0)
-			goto err;
-	} else {
-		ret = fdt_delprop(fdt, chosen_node, "bootargs");
-		if (ret && ret != -FDT_ERR_NOTFOUND) {
-			pr_err("Error deleting bootargs.\n");
-			return -EINVAL;
-		}
-	}
+	int ret;
 
-	if (image->type == KEXEC_TYPE_CRASH) {
-		/*
-		 * Avoid elfcorehdr from being stomped on in kdump kernel by
-		 * setting up memory reserve map.
-		 */
-		ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
-				      image->arch.elf_headers_sz);
-		if (ret) {
-			pr_err("Error reserving elfcorehdr memory: %s\n",
-			       fdt_strerror(ret));
-			goto err;
-		}
-	}
+	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
+	if (ret)
+		goto err;
 
-	ret = setup_ima_buffer(image, fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 	if (ret) {
 		pr_err("Error setting up the new device tree.\n");
 		return ret;
 	}
 
-	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
-	if (ret)
-		goto err;
-
 	return 0;
 
 err:
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 05/12] powerpc: Move ima buffer fields to struct kimage
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

The fields ima_buffer_addr and ima_buffer_size in "struct kimage_arch"
for powerpc are used to carry forward the IMA measurement list across
kexec system call.  These fields are not architecture specific, but are
currently limited to powerpc.

arch_ima_add_kexec_buffer() defined in "arch/powerpc/kexec/ima.c"
sets ima_buffer_addr and ima_buffer_size for the kexec system call.
This function does not have architecture specific code, but is
currently limited to powerpc.

Move ima_buffer_addr and ima_buffer_size to "struct kimage".
Rename arch_ima_add_kexec_buffer() to of_ima_add_kexec_buffer()
and move it in drivers/of/kexec.c.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Will Deacon <will@kernel.org>
---
 arch/powerpc/include/asm/ima.h     |  3 ---
 arch/powerpc/include/asm/kexec.h   |  5 -----
 arch/powerpc/kexec/ima.c           | 29 ++++++-----------------------
 drivers/of/kexec.c                 | 23 +++++++++++++++++++++++
 include/linux/kexec.h              |  5 +++++
 include/linux/of.h                 |  5 +++++
 security/integrity/ima/ima_kexec.c |  3 ++-
 7 files changed, 41 insertions(+), 32 deletions(-)

diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
index ead488cf3981..51f64fd06c19 100644
--- a/arch/powerpc/include/asm/ima.h
+++ b/arch/powerpc/include/asm/ima.h
@@ -14,9 +14,6 @@ static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
 #endif
 
 #ifdef CONFIG_IMA_KEXEC
-int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
-			      size_t size);
-
 int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
 #else
 static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index dbf09d2f36d0..2248dc27080b 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -111,11 +111,6 @@ struct kimage_arch {
 	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
-
-#ifdef CONFIG_IMA_KEXEC
-	phys_addr_t ima_buffer_addr;
-	size_t ima_buffer_size;
-#endif
 };
 
 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index 720e50e490b6..ed38125e2f87 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -128,23 +128,6 @@ void remove_ima_buffer(void *fdt, int chosen_node)
 }
 
 #ifdef CONFIG_IMA_KEXEC
-/**
- * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
- *
- * Architectures should use this function to pass on the IMA buffer
- * information to the next kernel.
- *
- * Return: 0 on success, negative errno on error.
- */
-int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
-			      size_t size)
-{
-	image->arch.ima_buffer_addr = load_addr;
-	image->arch.ima_buffer_size = size;
-
-	return 0;
-}
-
 static int write_number(void *p, u64 value, int cells)
 {
 	if (cells == 1) {
@@ -180,7 +163,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	u8 value[16];
 
 	remove_ima_buffer(fdt, chosen_node);
-	if (!image->arch.ima_buffer_size)
+	if (!image->ima_buffer_size)
 		return 0;
 
 	ret = get_addr_size_cells(&addr_cells, &size_cells);
@@ -192,11 +175,11 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (entry_size > sizeof(value))
 		return -EINVAL;
 
-	ret = write_number(value, image->arch.ima_buffer_addr, addr_cells);
+	ret = write_number(value, image->ima_buffer_addr, addr_cells);
 	if (ret)
 		return ret;
 
-	ret = write_number(value + 4 * addr_cells, image->arch.ima_buffer_size,
+	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
 			   size_cells);
 	if (ret)
 		return ret;
@@ -206,13 +189,13 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (ret < 0)
 		return -EINVAL;
 
-	ret = fdt_add_mem_rsv(fdt, image->arch.ima_buffer_addr,
-			      image->arch.ima_buffer_size);
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
 	if (ret)
 		return -EINVAL;
 
 	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
-		 image->arch.ima_buffer_addr, image->arch.ima_buffer_size);
+		 image->ima_buffer_addr, image->ima_buffer_size);
 
 	return 0;
 }
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 4afd3cc1c04a..efbf54f164fd 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -63,6 +63,29 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
 	return -ENOENT;
 }
 
+#ifdef CONFIG_IMA_KEXEC
+/**
+ * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
+ *
+ * @image: kimage struct to set IMA buffer data
+ * @load_addr: Starting address where IMA buffer is loaded at
+ * @size: Number of bytes in the IMA buffer
+ *
+ * Use this function to pass on the IMA buffer information to
+ * the next kernel across kexec system call.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int of_ima_add_kexec_buffer(struct kimage *image,
+			    unsigned long load_addr, size_t size)
+{
+	image->ima_buffer_addr = load_addr;
+	image->ima_buffer_size = size;
+
+	return 0;
+}
+#endif /* CONFIG_IMA_KEXEC */
+
 /*
  * of_kexec_setup_new_fdt - modify /chosen and memory reservation for the next kernel
  *
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 9e93bef52968..c142a1e5568d 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -300,6 +300,11 @@ struct kimage {
 	/* Information for loading purgatory */
 	struct purgatory_info purgatory_info;
 #endif
+
+#ifdef CONFIG_IMA_KEXEC
+	phys_addr_t ima_buffer_addr;
+	size_t ima_buffer_size;
+#endif
 };
 
 /* kexec interface functions */
diff --git a/include/linux/of.h b/include/linux/of.h
index 41e256adf758..551117c32773 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -564,6 +564,11 @@ int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 			   unsigned long initrd_load_addr, unsigned long initrd_len,
 			   const char *cmdline);
 
+#ifdef CONFIG_IMA_KEXEC
+int of_ima_add_kexec_buffer(struct kimage *image,
+			    unsigned long load_addr, size_t size);
+#endif /* CONFIG_IMA_KEXEC */
+
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 121de3e04af2..345b78515774 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -10,6 +10,7 @@
 #include <linux/seq_file.h>
 #include <linux/vmalloc.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
 #include "ima.h"
 
 #ifdef CONFIG_IMA_KEXEC
@@ -122,7 +123,7 @@ void ima_add_kexec_buffer(struct kimage *image)
 		return;
 	}
 
-	ret = arch_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
+	ret = of_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
 	if (ret) {
 		pr_err("Error passing over kexec measurement buffer.\n");
 		return;
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 05/12] powerpc: Move ima buffer fields to struct kimage
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

The fields ima_buffer_addr and ima_buffer_size in "struct kimage_arch"
for powerpc are used to carry forward the IMA measurement list across
kexec system call.  These fields are not architecture specific, but are
currently limited to powerpc.

arch_ima_add_kexec_buffer() defined in "arch/powerpc/kexec/ima.c"
sets ima_buffer_addr and ima_buffer_size for the kexec system call.
This function does not have architecture specific code, but is
currently limited to powerpc.

Move ima_buffer_addr and ima_buffer_size to "struct kimage".
Rename arch_ima_add_kexec_buffer() to of_ima_add_kexec_buffer()
and move it in drivers/of/kexec.c.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Will Deacon <will@kernel.org>
---
 arch/powerpc/include/asm/ima.h     |  3 ---
 arch/powerpc/include/asm/kexec.h   |  5 -----
 arch/powerpc/kexec/ima.c           | 29 ++++++-----------------------
 drivers/of/kexec.c                 | 23 +++++++++++++++++++++++
 include/linux/kexec.h              |  5 +++++
 include/linux/of.h                 |  5 +++++
 security/integrity/ima/ima_kexec.c |  3 ++-
 7 files changed, 41 insertions(+), 32 deletions(-)

diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
index ead488cf3981..51f64fd06c19 100644
--- a/arch/powerpc/include/asm/ima.h
+++ b/arch/powerpc/include/asm/ima.h
@@ -14,9 +14,6 @@ static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
 #endif
 
 #ifdef CONFIG_IMA_KEXEC
-int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
-			      size_t size);
-
 int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
 #else
 static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index dbf09d2f36d0..2248dc27080b 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -111,11 +111,6 @@ struct kimage_arch {
 	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
-
-#ifdef CONFIG_IMA_KEXEC
-	phys_addr_t ima_buffer_addr;
-	size_t ima_buffer_size;
-#endif
 };
 
 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index 720e50e490b6..ed38125e2f87 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -128,23 +128,6 @@ void remove_ima_buffer(void *fdt, int chosen_node)
 }
 
 #ifdef CONFIG_IMA_KEXEC
-/**
- * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
- *
- * Architectures should use this function to pass on the IMA buffer
- * information to the next kernel.
- *
- * Return: 0 on success, negative errno on error.
- */
-int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
-			      size_t size)
-{
-	image->arch.ima_buffer_addr = load_addr;
-	image->arch.ima_buffer_size = size;
-
-	return 0;
-}
-
 static int write_number(void *p, u64 value, int cells)
 {
 	if (cells == 1) {
@@ -180,7 +163,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	u8 value[16];
 
 	remove_ima_buffer(fdt, chosen_node);
-	if (!image->arch.ima_buffer_size)
+	if (!image->ima_buffer_size)
 		return 0;
 
 	ret = get_addr_size_cells(&addr_cells, &size_cells);
@@ -192,11 +175,11 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (entry_size > sizeof(value))
 		return -EINVAL;
 
-	ret = write_number(value, image->arch.ima_buffer_addr, addr_cells);
+	ret = write_number(value, image->ima_buffer_addr, addr_cells);
 	if (ret)
 		return ret;
 
-	ret = write_number(value + 4 * addr_cells, image->arch.ima_buffer_size,
+	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
 			   size_cells);
 	if (ret)
 		return ret;
@@ -206,13 +189,13 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (ret < 0)
 		return -EINVAL;
 
-	ret = fdt_add_mem_rsv(fdt, image->arch.ima_buffer_addr,
-			      image->arch.ima_buffer_size);
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
 	if (ret)
 		return -EINVAL;
 
 	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
-		 image->arch.ima_buffer_addr, image->arch.ima_buffer_size);
+		 image->ima_buffer_addr, image->ima_buffer_size);
 
 	return 0;
 }
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 4afd3cc1c04a..efbf54f164fd 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -63,6 +63,29 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
 	return -ENOENT;
 }
 
+#ifdef CONFIG_IMA_KEXEC
+/**
+ * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
+ *
+ * @image: kimage struct to set IMA buffer data
+ * @load_addr: Starting address where IMA buffer is loaded at
+ * @size: Number of bytes in the IMA buffer
+ *
+ * Use this function to pass on the IMA buffer information to
+ * the next kernel across kexec system call.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int of_ima_add_kexec_buffer(struct kimage *image,
+			    unsigned long load_addr, size_t size)
+{
+	image->ima_buffer_addr = load_addr;
+	image->ima_buffer_size = size;
+
+	return 0;
+}
+#endif /* CONFIG_IMA_KEXEC */
+
 /*
  * of_kexec_setup_new_fdt - modify /chosen and memory reservation for the next kernel
  *
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 9e93bef52968..c142a1e5568d 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -300,6 +300,11 @@ struct kimage {
 	/* Information for loading purgatory */
 	struct purgatory_info purgatory_info;
 #endif
+
+#ifdef CONFIG_IMA_KEXEC
+	phys_addr_t ima_buffer_addr;
+	size_t ima_buffer_size;
+#endif
 };
 
 /* kexec interface functions */
diff --git a/include/linux/of.h b/include/linux/of.h
index 41e256adf758..551117c32773 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -564,6 +564,11 @@ int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 			   unsigned long initrd_load_addr, unsigned long initrd_len,
 			   const char *cmdline);
 
+#ifdef CONFIG_IMA_KEXEC
+int of_ima_add_kexec_buffer(struct kimage *image,
+			    unsigned long load_addr, size_t size);
+#endif /* CONFIG_IMA_KEXEC */
+
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 121de3e04af2..345b78515774 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -10,6 +10,7 @@
 #include <linux/seq_file.h>
 #include <linux/vmalloc.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
 #include "ima.h"
 
 #ifdef CONFIG_IMA_KEXEC
@@ -122,7 +123,7 @@ void ima_add_kexec_buffer(struct kimage *image)
 		return;
 	}
 
-	ret = arch_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
+	ret = of_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
 	if (ret) {
 		pr_err("Error passing over kexec measurement buffer.\n");
 		return;
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 05/12] powerpc: Move ima buffer fields to struct kimage
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

The fields ima_buffer_addr and ima_buffer_size in "struct kimage_arch"
for powerpc are used to carry forward the IMA measurement list across
kexec system call.  These fields are not architecture specific, but are
currently limited to powerpc.

arch_ima_add_kexec_buffer() defined in "arch/powerpc/kexec/ima.c"
sets ima_buffer_addr and ima_buffer_size for the kexec system call.
This function does not have architecture specific code, but is
currently limited to powerpc.

Move ima_buffer_addr and ima_buffer_size to "struct kimage".
Rename arch_ima_add_kexec_buffer() to of_ima_add_kexec_buffer()
and move it in drivers/of/kexec.c.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Will Deacon <will@kernel.org>
---
 arch/powerpc/include/asm/ima.h     |  3 ---
 arch/powerpc/include/asm/kexec.h   |  5 -----
 arch/powerpc/kexec/ima.c           | 29 ++++++-----------------------
 drivers/of/kexec.c                 | 23 +++++++++++++++++++++++
 include/linux/kexec.h              |  5 +++++
 include/linux/of.h                 |  5 +++++
 security/integrity/ima/ima_kexec.c |  3 ++-
 7 files changed, 41 insertions(+), 32 deletions(-)

diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
index ead488cf3981..51f64fd06c19 100644
--- a/arch/powerpc/include/asm/ima.h
+++ b/arch/powerpc/include/asm/ima.h
@@ -14,9 +14,6 @@ static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
 #endif
 
 #ifdef CONFIG_IMA_KEXEC
-int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
-			      size_t size);
-
 int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
 #else
 static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index dbf09d2f36d0..2248dc27080b 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -111,11 +111,6 @@ struct kimage_arch {
 	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
-
-#ifdef CONFIG_IMA_KEXEC
-	phys_addr_t ima_buffer_addr;
-	size_t ima_buffer_size;
-#endif
 };
 
 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
index 720e50e490b6..ed38125e2f87 100644
--- a/arch/powerpc/kexec/ima.c
+++ b/arch/powerpc/kexec/ima.c
@@ -128,23 +128,6 @@ void remove_ima_buffer(void *fdt, int chosen_node)
 }
 
 #ifdef CONFIG_IMA_KEXEC
-/**
- * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer
- *
- * Architectures should use this function to pass on the IMA buffer
- * information to the next kernel.
- *
- * Return: 0 on success, negative errno on error.
- */
-int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr,
-			      size_t size)
-{
-	image->arch.ima_buffer_addr = load_addr;
-	image->arch.ima_buffer_size = size;
-
-	return 0;
-}
-
 static int write_number(void *p, u64 value, int cells)
 {
 	if (cells == 1) {
@@ -180,7 +163,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	u8 value[16];
 
 	remove_ima_buffer(fdt, chosen_node);
-	if (!image->arch.ima_buffer_size)
+	if (!image->ima_buffer_size)
 		return 0;
 
 	ret = get_addr_size_cells(&addr_cells, &size_cells);
@@ -192,11 +175,11 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (entry_size > sizeof(value))
 		return -EINVAL;
 
-	ret = write_number(value, image->arch.ima_buffer_addr, addr_cells);
+	ret = write_number(value, image->ima_buffer_addr, addr_cells);
 	if (ret)
 		return ret;
 
-	ret = write_number(value + 4 * addr_cells, image->arch.ima_buffer_size,
+	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
 			   size_cells);
 	if (ret)
 		return ret;
@@ -206,13 +189,13 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
 	if (ret < 0)
 		return -EINVAL;
 
-	ret = fdt_add_mem_rsv(fdt, image->arch.ima_buffer_addr,
-			      image->arch.ima_buffer_size);
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
 	if (ret)
 		return -EINVAL;
 
 	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
-		 image->arch.ima_buffer_addr, image->arch.ima_buffer_size);
+		 image->ima_buffer_addr, image->ima_buffer_size);
 
 	return 0;
 }
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 4afd3cc1c04a..efbf54f164fd 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -63,6 +63,29 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
 	return -ENOENT;
 }
 
+#ifdef CONFIG_IMA_KEXEC
+/**
+ * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
+ *
+ * @image: kimage struct to set IMA buffer data
+ * @load_addr: Starting address where IMA buffer is loaded at
+ * @size: Number of bytes in the IMA buffer
+ *
+ * Use this function to pass on the IMA buffer information to
+ * the next kernel across kexec system call.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int of_ima_add_kexec_buffer(struct kimage *image,
+			    unsigned long load_addr, size_t size)
+{
+	image->ima_buffer_addr = load_addr;
+	image->ima_buffer_size = size;
+
+	return 0;
+}
+#endif /* CONFIG_IMA_KEXEC */
+
 /*
  * of_kexec_setup_new_fdt - modify /chosen and memory reservation for the next kernel
  *
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index 9e93bef52968..c142a1e5568d 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -300,6 +300,11 @@ struct kimage {
 	/* Information for loading purgatory */
 	struct purgatory_info purgatory_info;
 #endif
+
+#ifdef CONFIG_IMA_KEXEC
+	phys_addr_t ima_buffer_addr;
+	size_t ima_buffer_size;
+#endif
 };
 
 /* kexec interface functions */
diff --git a/include/linux/of.h b/include/linux/of.h
index 41e256adf758..551117c32773 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -564,6 +564,11 @@ int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 			   unsigned long initrd_load_addr, unsigned long initrd_len,
 			   const char *cmdline);
 
+#ifdef CONFIG_IMA_KEXEC
+int of_ima_add_kexec_buffer(struct kimage *image,
+			    unsigned long load_addr, size_t size);
+#endif /* CONFIG_IMA_KEXEC */
+
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 121de3e04af2..345b78515774 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -10,6 +10,7 @@
 #include <linux/seq_file.h>
 #include <linux/vmalloc.h>
 #include <linux/kexec.h>
+#include <linux/of.h>
 #include "ima.h"
 
 #ifdef CONFIG_IMA_KEXEC
@@ -122,7 +123,7 @@ void ima_add_kexec_buffer(struct kimage *image)
 		return;
 	}
 
-	ret = arch_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
+	ret = of_ima_add_kexec_buffer(image, kbuf.mem, kexec_segment_size);
 	if (ret) {
 		pr_err("Error passing over kexec measurement buffer.\n");
 		return;
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 06/12] powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

The functions defined in "arch/powerpc/kexec/ima.c" handle setting up
and freeing the resources required to carry over the IMA measurement
list from the current kernel to the next kernel across kexec system call.
These functions do not have architecture specific code, but are
currently limited to powerpc.

Move setup_ima_buffer() call into of_kexec_setup_new_fdt() defined in
"drivers/of/kexec.c".  Call of_kexec_setup_new_fdt() from
setup_new_fdt_ppc64() and remove setup_new_fdt() in
"arch/powerpc/kexec/file_load.c".

Move the remaining architecture independent functions from
"arch/powerpc/kexec/ima.c" to "drivers/of/kexec.c".
Delete "arch/powerpc/kexec/ima.c" and "arch/powerpc/include/asm/ima.h".
Remove references to the deleted files in powerpc and in ima.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/Kconfig              |   2 +-
 arch/powerpc/include/asm/ima.h    |  27 ----
 arch/powerpc/include/asm/kexec.h  |   3 -
 arch/powerpc/kexec/Makefile       |   7 -
 arch/powerpc/kexec/file_load.c    |  35 -----
 arch/powerpc/kexec/file_load_64.c |   4 +-
 arch/powerpc/kexec/ima.c          | 202 -------------------------
 drivers/of/kexec.c                | 239 ++++++++++++++++++++++++++++++
 include/linux/of.h                |   2 +
 security/integrity/ima/ima.h      |   4 -
 10 files changed, 245 insertions(+), 280 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/ima.h
 delete mode 100644 arch/powerpc/kexec/ima.c

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 107bb4319e0e..d6e593ad270e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -554,7 +554,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "kexec file based system call"
 	select KEXEC_CORE
-	select HAVE_IMA_KEXEC
+	select HAVE_IMA_KEXEC if IMA
 	select BUILD_BIN2C
 	select KEXEC_ELF
 	depends on PPC64
diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
deleted file mode 100644
index 51f64fd06c19..000000000000
--- a/arch/powerpc/include/asm/ima.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_POWERPC_IMA_H
-#define _ASM_POWERPC_IMA_H
-
-struct kimage;
-
-int ima_get_kexec_buffer(void **addr, size_t *size);
-int ima_free_kexec_buffer(void);
-
-#ifdef CONFIG_IMA
-void remove_ima_buffer(void *fdt, int chosen_node);
-#else
-static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
-#endif
-
-#ifdef CONFIG_IMA_KEXEC
-int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
-#else
-static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
-				   int chosen_node)
-{
-	remove_ima_buffer(fdt, chosen_node);
-	return 0;
-}
-#endif /* CONFIG_IMA_KEXEC */
-
-#endif /* _ASM_POWERPC_IMA_H */
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 2248dc27080b..939bc40dfa62 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -118,9 +118,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 int setup_purgatory(struct kimage *image, const void *slave_code,
 		    const void *fdt, unsigned long kernel_load_addr,
 		    unsigned long fdt_load_addr);
-int setup_new_fdt(const struct kimage *image, void *fdt,
-		  unsigned long initrd_load_addr, unsigned long initrd_len,
-		  const char *cmdline);
 int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 
 #ifdef CONFIG_PPC64
diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile
index 4aff6846c772..b6c52608cb49 100644
--- a/arch/powerpc/kexec/Makefile
+++ b/arch/powerpc/kexec/Makefile
@@ -9,13 +9,6 @@ obj-$(CONFIG_PPC32)		+= relocate_32.o
 
 obj-$(CONFIG_KEXEC_FILE)	+= file_load.o ranges.o file_load_$(BITS).o elf_$(BITS).o
 
-ifdef CONFIG_HAVE_IMA_KEXEC
-ifdef CONFIG_IMA
-obj-y				+= ima.o
-endif
-endif
-
-
 # Disable GCOV, KCOV & sanitizers in odd or sensitive code
 GCOV_PROFILE_core_$(BITS).o := n
 KCOV_INSTRUMENT_core_$(BITS).o := n
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 956bcb2d1ec2..5dd3a9c45a2d 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -20,7 +20,6 @@
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/setup.h>
-#include <asm/ima.h>
 
 #define SLAVE_CODE_SIZE		256	/* First 0x100 bytes */
 
@@ -141,37 +140,3 @@ int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
 
 	return -ENOENT;
 }
-
-/*
- * setup_new_fdt - modify /chosen and memory reservation for the next kernel
- * @image:		kexec image being loaded.
- * @fdt:		Flattened device tree for the next kernel.
- * @initrd_load_addr:	Address where the next initrd will be loaded.
- * @initrd_len:		Size of the next initrd, or 0 if there will be none.
- * @cmdline:		Command line for the next kernel, or NULL if there will
- *			be none.
- *
- * Return: 0 on success, or negative errno on error.
- */
-int setup_new_fdt(const struct kimage *image, void *fdt,
-		  unsigned long initrd_load_addr, unsigned long initrd_len,
-		  const char *cmdline)
-{
-	int ret;
-
-	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
-	if (ret)
-		goto err;
-
-	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
-	if (ret) {
-		pr_err("Error setting up the new device tree.\n");
-		return ret;
-	}
-
-	return 0;
-
-err:
-	pr_err("Error setting up the new device tree.\n");
-	return -EINVAL;
-}
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index a05c19b3cc60..3cab318aa3b9 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -17,6 +17,7 @@
 #include <linux/kexec.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
+#include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/memblock.h>
 #include <linux/slab.h>
@@ -944,7 +945,8 @@ int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
 	struct crash_mem *umem = NULL, *rmem = NULL;
 	int i, nr_ranges, ret;
 
-	ret = setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
+	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len,
+				     cmdline);
 	if (ret)
 		goto out;
 
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
deleted file mode 100644
index ed38125e2f87..000000000000
--- a/arch/powerpc/kexec/ima.c
+++ /dev/null
@@ -1,202 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2016 IBM Corporation
- *
- * Authors:
- * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
- */
-
-#include <linux/slab.h>
-#include <linux/kexec.h>
-#include <linux/of.h>
-#include <linux/memblock.h>
-#include <linux/libfdt.h>
-
-static int get_addr_size_cells(int *addr_cells, int *size_cells)
-{
-	struct device_node *root;
-
-	root = of_find_node_by_path("/");
-	if (!root)
-		return -EINVAL;
-
-	*addr_cells = of_n_addr_cells(root);
-	*size_cells = of_n_size_cells(root);
-
-	of_node_put(root);
-
-	return 0;
-}
-
-static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
-			       size_t *size)
-{
-	int ret, addr_cells, size_cells;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	if (len < 4 * (addr_cells + size_cells))
-		return -ENOENT;
-
-	*addr = of_read_number(prop, addr_cells);
-	*size = of_read_number(prop + 4 * addr_cells, size_cells);
-
-	return 0;
-}
-
-/**
- * ima_get_kexec_buffer - get IMA buffer from the previous kernel
- * @addr:	On successful return, set to point to the buffer contents.
- * @size:	On successful return, set to the buffer size.
- *
- * Return: 0 on success, negative errno on error.
- */
-int ima_get_kexec_buffer(void **addr, size_t *size)
-{
-	int ret, len;
-	unsigned long tmp_addr;
-	size_t tmp_size;
-	const void *prop;
-
-	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
-	if (ret)
-		return ret;
-
-	*addr = __va(tmp_addr);
-	*size = tmp_size;
-
-	return 0;
-}
-
-/**
- * ima_free_kexec_buffer - free memory used by the IMA buffer
- */
-int ima_free_kexec_buffer(void)
-{
-	int ret;
-	unsigned long addr;
-	size_t size;
-	struct property *prop;
-
-	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
-	if (ret)
-		return ret;
-
-	ret = of_remove_property(of_chosen, prop);
-	if (ret)
-		return ret;
-
-	return memblock_free(addr, size);
-
-}
-
-/**
- * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
- *
- * The IMA measurement buffer is of no use to a subsequent kernel, so we always
- * remove it from the device tree.
- */
-void remove_ima_buffer(void *fdt, int chosen_node)
-{
-	int ret, len;
-	unsigned long addr;
-	size_t size;
-	const void *prop;
-
-	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return;
-
-	ret = do_get_kexec_buffer(prop, len, &addr, &size);
-	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
-	if (ret)
-		return;
-
-	ret = delete_fdt_mem_rsv(fdt, addr, size);
-	if (!ret)
-		pr_debug("Removed old IMA buffer reservation.\n");
-}
-
-#ifdef CONFIG_IMA_KEXEC
-static int write_number(void *p, u64 value, int cells)
-{
-	if (cells == 1) {
-		u32 tmp;
-
-		if (value > U32_MAX)
-			return -EINVAL;
-
-		tmp = cpu_to_be32(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else if (cells == 2) {
-		u64 tmp;
-
-		tmp = cpu_to_be64(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else
-		return -EINVAL;
-
-	return 0;
-}
-
-/**
- * setup_ima_buffer - add IMA buffer information to the fdt
- * @image:		kexec image being loaded.
- * @fdt:		Flattened device tree for the next kernel.
- * @chosen_node:	Offset to the chosen node.
- *
- * Return: 0 on success, or negative errno on error.
- */
-int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
-{
-	int ret, addr_cells, size_cells, entry_size;
-	u8 value[16];
-
-	remove_ima_buffer(fdt, chosen_node);
-	if (!image->ima_buffer_size)
-		return 0;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	entry_size = 4 * (addr_cells + size_cells);
-
-	if (entry_size > sizeof(value))
-		return -EINVAL;
-
-	ret = write_number(value, image->ima_buffer_addr, addr_cells);
-	if (ret)
-		return ret;
-
-	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
-			   size_cells);
-	if (ret)
-		return ret;
-
-	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
-			  entry_size);
-	if (ret < 0)
-		return -EINVAL;
-
-	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
-			      image->ima_buffer_size);
-	if (ret)
-		return -EINVAL;
-
-	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
-		 image->ima_buffer_addr, image->ima_buffer_size);
-
-	return 0;
-}
-#endif /* CONFIG_IMA_KEXEC */
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index efbf54f164fd..7ee4f498ca19 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/memblock.h>
 #include <linux/libfdt.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
@@ -63,6 +64,152 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
 	return -ENOENT;
 }
 
+
+/**
+ * get_addr_size_cells - Get address and size of root node
+ *
+ * @addr_cells: Return address of the root node
+ * @size_cells: Return size of the root node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int get_addr_size_cells(int *addr_cells, int *size_cells)
+{
+	struct device_node *root;
+
+	root = of_find_node_by_path("/");
+	if (!root)
+		return -EINVAL;
+
+	*addr_cells = of_n_addr_cells(root);
+	*size_cells = of_n_size_cells(root);
+
+	of_node_put(root);
+
+	return 0;
+}
+
+/**
+ * do_get_kexec_buffer - Get address and size of device tree property
+ *
+ * @prop: Device tree property
+ * @len: Size of @prop
+ * @addr: Return address of the node
+ * @size: Return size of the node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
+			       size_t *size)
+{
+	int ret, addr_cells, size_cells;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	if (len < 4 * (addr_cells + size_cells))
+		return -ENOENT;
+
+	*addr = of_read_number(prop, addr_cells);
+	*size = of_read_number(prop + 4 * addr_cells, size_cells);
+
+	return 0;
+}
+
+/**
+ * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
+ *
+ * @fdt: Flattened Device Tree to update
+ * @chosen_node: Offset to the chosen node in the device tree
+ *
+ * The IMA measurement buffer is of no use to a subsequent kernel, so we always
+ * remove it from the device tree.
+ */
+static void remove_ima_buffer(void *fdt, int chosen_node)
+{
+	int ret, len;
+	unsigned long addr;
+	size_t size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return;
+
+	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return;
+
+	ret = do_get_kexec_buffer(prop, len, &addr, &size);
+	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
+	if (ret)
+		return;
+
+	ret = fdt_find_and_del_mem_rsv(fdt, addr, size);
+	if (!ret)
+		pr_debug("Removed old IMA buffer reservation.\n");
+}
+
+/**
+ * ima_get_kexec_buffer - get IMA buffer from the previous kernel
+ * @addr:	On successful return, set to point to the buffer contents.
+ * @size:	On successful return, set to the buffer size.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int ima_get_kexec_buffer(void **addr, size_t *size)
+{
+	int ret, len;
+	unsigned long tmp_addr;
+	size_t tmp_size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
+	if (ret)
+		return ret;
+
+	*addr = __va(tmp_addr);
+	*size = tmp_size;
+
+	return 0;
+}
+
+/**
+ * ima_free_kexec_buffer - free memory used by the IMA buffer
+ */
+int ima_free_kexec_buffer(void)
+{
+	int ret;
+	unsigned long addr;
+	size_t size;
+	struct property *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+	if (ret)
+		return ret;
+
+	ret = of_remove_property(of_chosen, prop);
+	if (ret)
+		return ret;
+
+	return memblock_free(addr, size);
+
+}
+
 #ifdef CONFIG_IMA_KEXEC
 /**
  * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
@@ -84,6 +231,93 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 
 	return 0;
 }
+
+/**
+ * write_number - Convert number to big-endian format
+ *
+ * @p:		Buffer to write the number to
+ * @value:	Number to convert
+ * @cells:	Number of cells
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int write_number(void *p, u64 value, int cells)
+{
+	if (cells == 1) {
+		u32 tmp;
+
+		if (value > U32_MAX)
+			return -EINVAL;
+
+		tmp = cpu_to_be32(value);
+		memcpy(p, &tmp, sizeof(tmp));
+	} else if (cells == 2) {
+		u64 tmp;
+
+		tmp = cpu_to_be64(value);
+		memcpy(p, &tmp, sizeof(tmp));
+	} else
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * setup_ima_buffer - add IMA buffer information to the fdt
+ * @image:		kexec image being loaded.
+ * @fdt:		Flattened device tree for the next kernel.
+ * @chosen_node:	Offset to the chosen node.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int setup_ima_buffer(const struct kimage *image, void *fdt,
+			    int chosen_node)
+{
+	int ret, addr_cells, size_cells, entry_size;
+	u8 value[16];
+
+	if (!image->ima_buffer_size)
+		return 0;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	entry_size = 4 * (addr_cells + size_cells);
+
+	if (entry_size > sizeof(value))
+		return -EINVAL;
+
+	ret = write_number(value, image->ima_buffer_addr, addr_cells);
+	if (ret)
+		return ret;
+
+	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
+			   size_cells);
+	if (ret)
+		return ret;
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
+			  entry_size);
+	if (ret < 0)
+		return -EINVAL;
+
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
+	if (ret)
+		return -EINVAL;
+
+	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
+		 image->ima_buffer_addr, image->ima_buffer_size);
+
+	return 0;
+}
+#else /* CONFIG_IMA_KEXEC */
+static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
+				   int chosen_node)
+{
+	return 0;
+}
 #endif /* CONFIG_IMA_KEXEC */
 
 /*
@@ -250,6 +484,11 @@ int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 	}
 
 	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+	if (ret)
+		goto out;
+
+	remove_ima_buffer(fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 
 out:
 	if (ret)
diff --git a/include/linux/of.h b/include/linux/of.h
index 551117c32773..19f77dd12507 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -569,6 +569,8 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 			    unsigned long load_addr, size_t size);
 #endif /* CONFIG_IMA_KEXEC */
 
+int ima_get_kexec_buffer(void **addr, size_t *size);
+int ima_free_kexec_buffer(void);
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index aa312472c7c5..fdae37fa7051 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -24,10 +24,6 @@
 
 #include "../integrity.h"
 
-#ifdef CONFIG_HAVE_IMA_KEXEC
-#include <asm/ima.h>
-#endif
-
 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
 		     IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 06/12] powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

The functions defined in "arch/powerpc/kexec/ima.c" handle setting up
and freeing the resources required to carry over the IMA measurement
list from the current kernel to the next kernel across kexec system call.
These functions do not have architecture specific code, but are
currently limited to powerpc.

Move setup_ima_buffer() call into of_kexec_setup_new_fdt() defined in
"drivers/of/kexec.c".  Call of_kexec_setup_new_fdt() from
setup_new_fdt_ppc64() and remove setup_new_fdt() in
"arch/powerpc/kexec/file_load.c".

Move the remaining architecture independent functions from
"arch/powerpc/kexec/ima.c" to "drivers/of/kexec.c".
Delete "arch/powerpc/kexec/ima.c" and "arch/powerpc/include/asm/ima.h".
Remove references to the deleted files in powerpc and in ima.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/Kconfig              |   2 +-
 arch/powerpc/include/asm/ima.h    |  27 ----
 arch/powerpc/include/asm/kexec.h  |   3 -
 arch/powerpc/kexec/Makefile       |   7 -
 arch/powerpc/kexec/file_load.c    |  35 -----
 arch/powerpc/kexec/file_load_64.c |   4 +-
 arch/powerpc/kexec/ima.c          | 202 -------------------------
 drivers/of/kexec.c                | 239 ++++++++++++++++++++++++++++++
 include/linux/of.h                |   2 +
 security/integrity/ima/ima.h      |   4 -
 10 files changed, 245 insertions(+), 280 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/ima.h
 delete mode 100644 arch/powerpc/kexec/ima.c

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 107bb4319e0e..d6e593ad270e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -554,7 +554,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "kexec file based system call"
 	select KEXEC_CORE
-	select HAVE_IMA_KEXEC
+	select HAVE_IMA_KEXEC if IMA
 	select BUILD_BIN2C
 	select KEXEC_ELF
 	depends on PPC64
diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
deleted file mode 100644
index 51f64fd06c19..000000000000
--- a/arch/powerpc/include/asm/ima.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_POWERPC_IMA_H
-#define _ASM_POWERPC_IMA_H
-
-struct kimage;
-
-int ima_get_kexec_buffer(void **addr, size_t *size);
-int ima_free_kexec_buffer(void);
-
-#ifdef CONFIG_IMA
-void remove_ima_buffer(void *fdt, int chosen_node);
-#else
-static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
-#endif
-
-#ifdef CONFIG_IMA_KEXEC
-int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
-#else
-static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
-				   int chosen_node)
-{
-	remove_ima_buffer(fdt, chosen_node);
-	return 0;
-}
-#endif /* CONFIG_IMA_KEXEC */
-
-#endif /* _ASM_POWERPC_IMA_H */
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 2248dc27080b..939bc40dfa62 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -118,9 +118,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 int setup_purgatory(struct kimage *image, const void *slave_code,
 		    const void *fdt, unsigned long kernel_load_addr,
 		    unsigned long fdt_load_addr);
-int setup_new_fdt(const struct kimage *image, void *fdt,
-		  unsigned long initrd_load_addr, unsigned long initrd_len,
-		  const char *cmdline);
 int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 
 #ifdef CONFIG_PPC64
diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile
index 4aff6846c772..b6c52608cb49 100644
--- a/arch/powerpc/kexec/Makefile
+++ b/arch/powerpc/kexec/Makefile
@@ -9,13 +9,6 @@ obj-$(CONFIG_PPC32)		+= relocate_32.o
 
 obj-$(CONFIG_KEXEC_FILE)	+= file_load.o ranges.o file_load_$(BITS).o elf_$(BITS).o
 
-ifdef CONFIG_HAVE_IMA_KEXEC
-ifdef CONFIG_IMA
-obj-y				+= ima.o
-endif
-endif
-
-
 # Disable GCOV, KCOV & sanitizers in odd or sensitive code
 GCOV_PROFILE_core_$(BITS).o := n
 KCOV_INSTRUMENT_core_$(BITS).o := n
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 956bcb2d1ec2..5dd3a9c45a2d 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -20,7 +20,6 @@
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/setup.h>
-#include <asm/ima.h>
 
 #define SLAVE_CODE_SIZE		256	/* First 0x100 bytes */
 
@@ -141,37 +140,3 @@ int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
 
 	return -ENOENT;
 }
-
-/*
- * setup_new_fdt - modify /chosen and memory reservation for the next kernel
- * @image:		kexec image being loaded.
- * @fdt:		Flattened device tree for the next kernel.
- * @initrd_load_addr:	Address where the next initrd will be loaded.
- * @initrd_len:		Size of the next initrd, or 0 if there will be none.
- * @cmdline:		Command line for the next kernel, or NULL if there will
- *			be none.
- *
- * Return: 0 on success, or negative errno on error.
- */
-int setup_new_fdt(const struct kimage *image, void *fdt,
-		  unsigned long initrd_load_addr, unsigned long initrd_len,
-		  const char *cmdline)
-{
-	int ret;
-
-	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
-	if (ret)
-		goto err;
-
-	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
-	if (ret) {
-		pr_err("Error setting up the new device tree.\n");
-		return ret;
-	}
-
-	return 0;
-
-err:
-	pr_err("Error setting up the new device tree.\n");
-	return -EINVAL;
-}
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index a05c19b3cc60..3cab318aa3b9 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -17,6 +17,7 @@
 #include <linux/kexec.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
+#include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/memblock.h>
 #include <linux/slab.h>
@@ -944,7 +945,8 @@ int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
 	struct crash_mem *umem = NULL, *rmem = NULL;
 	int i, nr_ranges, ret;
 
-	ret = setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
+	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len,
+				     cmdline);
 	if (ret)
 		goto out;
 
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
deleted file mode 100644
index ed38125e2f87..000000000000
--- a/arch/powerpc/kexec/ima.c
+++ /dev/null
@@ -1,202 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2016 IBM Corporation
- *
- * Authors:
- * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
- */
-
-#include <linux/slab.h>
-#include <linux/kexec.h>
-#include <linux/of.h>
-#include <linux/memblock.h>
-#include <linux/libfdt.h>
-
-static int get_addr_size_cells(int *addr_cells, int *size_cells)
-{
-	struct device_node *root;
-
-	root = of_find_node_by_path("/");
-	if (!root)
-		return -EINVAL;
-
-	*addr_cells = of_n_addr_cells(root);
-	*size_cells = of_n_size_cells(root);
-
-	of_node_put(root);
-
-	return 0;
-}
-
-static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
-			       size_t *size)
-{
-	int ret, addr_cells, size_cells;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	if (len < 4 * (addr_cells + size_cells))
-		return -ENOENT;
-
-	*addr = of_read_number(prop, addr_cells);
-	*size = of_read_number(prop + 4 * addr_cells, size_cells);
-
-	return 0;
-}
-
-/**
- * ima_get_kexec_buffer - get IMA buffer from the previous kernel
- * @addr:	On successful return, set to point to the buffer contents.
- * @size:	On successful return, set to the buffer size.
- *
- * Return: 0 on success, negative errno on error.
- */
-int ima_get_kexec_buffer(void **addr, size_t *size)
-{
-	int ret, len;
-	unsigned long tmp_addr;
-	size_t tmp_size;
-	const void *prop;
-
-	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
-	if (ret)
-		return ret;
-
-	*addr = __va(tmp_addr);
-	*size = tmp_size;
-
-	return 0;
-}
-
-/**
- * ima_free_kexec_buffer - free memory used by the IMA buffer
- */
-int ima_free_kexec_buffer(void)
-{
-	int ret;
-	unsigned long addr;
-	size_t size;
-	struct property *prop;
-
-	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
-	if (ret)
-		return ret;
-
-	ret = of_remove_property(of_chosen, prop);
-	if (ret)
-		return ret;
-
-	return memblock_free(addr, size);
-
-}
-
-/**
- * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
- *
- * The IMA measurement buffer is of no use to a subsequent kernel, so we always
- * remove it from the device tree.
- */
-void remove_ima_buffer(void *fdt, int chosen_node)
-{
-	int ret, len;
-	unsigned long addr;
-	size_t size;
-	const void *prop;
-
-	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return;
-
-	ret = do_get_kexec_buffer(prop, len, &addr, &size);
-	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
-	if (ret)
-		return;
-
-	ret = delete_fdt_mem_rsv(fdt, addr, size);
-	if (!ret)
-		pr_debug("Removed old IMA buffer reservation.\n");
-}
-
-#ifdef CONFIG_IMA_KEXEC
-static int write_number(void *p, u64 value, int cells)
-{
-	if (cells == 1) {
-		u32 tmp;
-
-		if (value > U32_MAX)
-			return -EINVAL;
-
-		tmp = cpu_to_be32(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else if (cells == 2) {
-		u64 tmp;
-
-		tmp = cpu_to_be64(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else
-		return -EINVAL;
-
-	return 0;
-}
-
-/**
- * setup_ima_buffer - add IMA buffer information to the fdt
- * @image:		kexec image being loaded.
- * @fdt:		Flattened device tree for the next kernel.
- * @chosen_node:	Offset to the chosen node.
- *
- * Return: 0 on success, or negative errno on error.
- */
-int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
-{
-	int ret, addr_cells, size_cells, entry_size;
-	u8 value[16];
-
-	remove_ima_buffer(fdt, chosen_node);
-	if (!image->ima_buffer_size)
-		return 0;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	entry_size = 4 * (addr_cells + size_cells);
-
-	if (entry_size > sizeof(value))
-		return -EINVAL;
-
-	ret = write_number(value, image->ima_buffer_addr, addr_cells);
-	if (ret)
-		return ret;
-
-	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
-			   size_cells);
-	if (ret)
-		return ret;
-
-	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
-			  entry_size);
-	if (ret < 0)
-		return -EINVAL;
-
-	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
-			      image->ima_buffer_size);
-	if (ret)
-		return -EINVAL;
-
-	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
-		 image->ima_buffer_addr, image->ima_buffer_size);
-
-	return 0;
-}
-#endif /* CONFIG_IMA_KEXEC */
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index efbf54f164fd..7ee4f498ca19 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/memblock.h>
 #include <linux/libfdt.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
@@ -63,6 +64,152 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
 	return -ENOENT;
 }
 
+
+/**
+ * get_addr_size_cells - Get address and size of root node
+ *
+ * @addr_cells: Return address of the root node
+ * @size_cells: Return size of the root node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int get_addr_size_cells(int *addr_cells, int *size_cells)
+{
+	struct device_node *root;
+
+	root = of_find_node_by_path("/");
+	if (!root)
+		return -EINVAL;
+
+	*addr_cells = of_n_addr_cells(root);
+	*size_cells = of_n_size_cells(root);
+
+	of_node_put(root);
+
+	return 0;
+}
+
+/**
+ * do_get_kexec_buffer - Get address and size of device tree property
+ *
+ * @prop: Device tree property
+ * @len: Size of @prop
+ * @addr: Return address of the node
+ * @size: Return size of the node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
+			       size_t *size)
+{
+	int ret, addr_cells, size_cells;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	if (len < 4 * (addr_cells + size_cells))
+		return -ENOENT;
+
+	*addr = of_read_number(prop, addr_cells);
+	*size = of_read_number(prop + 4 * addr_cells, size_cells);
+
+	return 0;
+}
+
+/**
+ * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
+ *
+ * @fdt: Flattened Device Tree to update
+ * @chosen_node: Offset to the chosen node in the device tree
+ *
+ * The IMA measurement buffer is of no use to a subsequent kernel, so we always
+ * remove it from the device tree.
+ */
+static void remove_ima_buffer(void *fdt, int chosen_node)
+{
+	int ret, len;
+	unsigned long addr;
+	size_t size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return;
+
+	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return;
+
+	ret = do_get_kexec_buffer(prop, len, &addr, &size);
+	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
+	if (ret)
+		return;
+
+	ret = fdt_find_and_del_mem_rsv(fdt, addr, size);
+	if (!ret)
+		pr_debug("Removed old IMA buffer reservation.\n");
+}
+
+/**
+ * ima_get_kexec_buffer - get IMA buffer from the previous kernel
+ * @addr:	On successful return, set to point to the buffer contents.
+ * @size:	On successful return, set to the buffer size.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int ima_get_kexec_buffer(void **addr, size_t *size)
+{
+	int ret, len;
+	unsigned long tmp_addr;
+	size_t tmp_size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
+	if (ret)
+		return ret;
+
+	*addr = __va(tmp_addr);
+	*size = tmp_size;
+
+	return 0;
+}
+
+/**
+ * ima_free_kexec_buffer - free memory used by the IMA buffer
+ */
+int ima_free_kexec_buffer(void)
+{
+	int ret;
+	unsigned long addr;
+	size_t size;
+	struct property *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+	if (ret)
+		return ret;
+
+	ret = of_remove_property(of_chosen, prop);
+	if (ret)
+		return ret;
+
+	return memblock_free(addr, size);
+
+}
+
 #ifdef CONFIG_IMA_KEXEC
 /**
  * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
@@ -84,6 +231,93 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 
 	return 0;
 }
+
+/**
+ * write_number - Convert number to big-endian format
+ *
+ * @p:		Buffer to write the number to
+ * @value:	Number to convert
+ * @cells:	Number of cells
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int write_number(void *p, u64 value, int cells)
+{
+	if (cells == 1) {
+		u32 tmp;
+
+		if (value > U32_MAX)
+			return -EINVAL;
+
+		tmp = cpu_to_be32(value);
+		memcpy(p, &tmp, sizeof(tmp));
+	} else if (cells == 2) {
+		u64 tmp;
+
+		tmp = cpu_to_be64(value);
+		memcpy(p, &tmp, sizeof(tmp));
+	} else
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * setup_ima_buffer - add IMA buffer information to the fdt
+ * @image:		kexec image being loaded.
+ * @fdt:		Flattened device tree for the next kernel.
+ * @chosen_node:	Offset to the chosen node.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int setup_ima_buffer(const struct kimage *image, void *fdt,
+			    int chosen_node)
+{
+	int ret, addr_cells, size_cells, entry_size;
+	u8 value[16];
+
+	if (!image->ima_buffer_size)
+		return 0;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	entry_size = 4 * (addr_cells + size_cells);
+
+	if (entry_size > sizeof(value))
+		return -EINVAL;
+
+	ret = write_number(value, image->ima_buffer_addr, addr_cells);
+	if (ret)
+		return ret;
+
+	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
+			   size_cells);
+	if (ret)
+		return ret;
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
+			  entry_size);
+	if (ret < 0)
+		return -EINVAL;
+
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
+	if (ret)
+		return -EINVAL;
+
+	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
+		 image->ima_buffer_addr, image->ima_buffer_size);
+
+	return 0;
+}
+#else /* CONFIG_IMA_KEXEC */
+static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
+				   int chosen_node)
+{
+	return 0;
+}
 #endif /* CONFIG_IMA_KEXEC */
 
 /*
@@ -250,6 +484,11 @@ int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 	}
 
 	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+	if (ret)
+		goto out;
+
+	remove_ima_buffer(fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 
 out:
 	if (ret)
diff --git a/include/linux/of.h b/include/linux/of.h
index 551117c32773..19f77dd12507 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -569,6 +569,8 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 			    unsigned long load_addr, size_t size);
 #endif /* CONFIG_IMA_KEXEC */
 
+int ima_get_kexec_buffer(void **addr, size_t *size);
+int ima_free_kexec_buffer(void);
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index aa312472c7c5..fdae37fa7051 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -24,10 +24,6 @@
 
 #include "../integrity.h"
 
-#ifdef CONFIG_HAVE_IMA_KEXEC
-#include <asm/ima.h>
-#endif
-
 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
 		     IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 06/12] powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

The functions defined in "arch/powerpc/kexec/ima.c" handle setting up
and freeing the resources required to carry over the IMA measurement
list from the current kernel to the next kernel across kexec system call.
These functions do not have architecture specific code, but are
currently limited to powerpc.

Move setup_ima_buffer() call into of_kexec_setup_new_fdt() defined in
"drivers/of/kexec.c".  Call of_kexec_setup_new_fdt() from
setup_new_fdt_ppc64() and remove setup_new_fdt() in
"arch/powerpc/kexec/file_load.c".

Move the remaining architecture independent functions from
"arch/powerpc/kexec/ima.c" to "drivers/of/kexec.c".
Delete "arch/powerpc/kexec/ima.c" and "arch/powerpc/include/asm/ima.h".
Remove references to the deleted files in powerpc and in ima.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/Kconfig              |   2 +-
 arch/powerpc/include/asm/ima.h    |  27 ----
 arch/powerpc/include/asm/kexec.h  |   3 -
 arch/powerpc/kexec/Makefile       |   7 -
 arch/powerpc/kexec/file_load.c    |  35 -----
 arch/powerpc/kexec/file_load_64.c |   4 +-
 arch/powerpc/kexec/ima.c          | 202 -------------------------
 drivers/of/kexec.c                | 239 ++++++++++++++++++++++++++++++
 include/linux/of.h                |   2 +
 security/integrity/ima/ima.h      |   4 -
 10 files changed, 245 insertions(+), 280 deletions(-)
 delete mode 100644 arch/powerpc/include/asm/ima.h
 delete mode 100644 arch/powerpc/kexec/ima.c

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 107bb4319e0e..d6e593ad270e 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -554,7 +554,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "kexec file based system call"
 	select KEXEC_CORE
-	select HAVE_IMA_KEXEC
+	select HAVE_IMA_KEXEC if IMA
 	select BUILD_BIN2C
 	select KEXEC_ELF
 	depends on PPC64
diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h
deleted file mode 100644
index 51f64fd06c19..000000000000
--- a/arch/powerpc/include/asm/ima.h
+++ /dev/null
@@ -1,27 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ASM_POWERPC_IMA_H
-#define _ASM_POWERPC_IMA_H
-
-struct kimage;
-
-int ima_get_kexec_buffer(void **addr, size_t *size);
-int ima_free_kexec_buffer(void);
-
-#ifdef CONFIG_IMA
-void remove_ima_buffer(void *fdt, int chosen_node);
-#else
-static inline void remove_ima_buffer(void *fdt, int chosen_node) {}
-#endif
-
-#ifdef CONFIG_IMA_KEXEC
-int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node);
-#else
-static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
-				   int chosen_node)
-{
-	remove_ima_buffer(fdt, chosen_node);
-	return 0;
-}
-#endif /* CONFIG_IMA_KEXEC */
-
-#endif /* _ASM_POWERPC_IMA_H */
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 2248dc27080b..939bc40dfa62 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -118,9 +118,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 int setup_purgatory(struct kimage *image, const void *slave_code,
 		    const void *fdt, unsigned long kernel_load_addr,
 		    unsigned long fdt_load_addr);
-int setup_new_fdt(const struct kimage *image, void *fdt,
-		  unsigned long initrd_load_addr, unsigned long initrd_len,
-		  const char *cmdline);
 int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 
 #ifdef CONFIG_PPC64
diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile
index 4aff6846c772..b6c52608cb49 100644
--- a/arch/powerpc/kexec/Makefile
+++ b/arch/powerpc/kexec/Makefile
@@ -9,13 +9,6 @@ obj-$(CONFIG_PPC32)		+= relocate_32.o
 
 obj-$(CONFIG_KEXEC_FILE)	+= file_load.o ranges.o file_load_$(BITS).o elf_$(BITS).o
 
-ifdef CONFIG_HAVE_IMA_KEXEC
-ifdef CONFIG_IMA
-obj-y				+= ima.o
-endif
-endif
-
-
 # Disable GCOV, KCOV & sanitizers in odd or sensitive code
 GCOV_PROFILE_core_$(BITS).o := n
 KCOV_INSTRUMENT_core_$(BITS).o := n
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 956bcb2d1ec2..5dd3a9c45a2d 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -20,7 +20,6 @@
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
 #include <asm/setup.h>
-#include <asm/ima.h>
 
 #define SLAVE_CODE_SIZE		256	/* First 0x100 bytes */
 
@@ -141,37 +140,3 @@ int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
 
 	return -ENOENT;
 }
-
-/*
- * setup_new_fdt - modify /chosen and memory reservation for the next kernel
- * @image:		kexec image being loaded.
- * @fdt:		Flattened device tree for the next kernel.
- * @initrd_load_addr:	Address where the next initrd will be loaded.
- * @initrd_len:		Size of the next initrd, or 0 if there will be none.
- * @cmdline:		Command line for the next kernel, or NULL if there will
- *			be none.
- *
- * Return: 0 on success, or negative errno on error.
- */
-int setup_new_fdt(const struct kimage *image, void *fdt,
-		  unsigned long initrd_load_addr, unsigned long initrd_len,
-		  const char *cmdline)
-{
-	int ret;
-
-	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
-	if (ret)
-		goto err;
-
-	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
-	if (ret) {
-		pr_err("Error setting up the new device tree.\n");
-		return ret;
-	}
-
-	return 0;
-
-err:
-	pr_err("Error setting up the new device tree.\n");
-	return -EINVAL;
-}
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index a05c19b3cc60..3cab318aa3b9 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -17,6 +17,7 @@
 #include <linux/kexec.h>
 #include <linux/of_fdt.h>
 #include <linux/libfdt.h>
+#include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/memblock.h>
 #include <linux/slab.h>
@@ -944,7 +945,8 @@ int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
 	struct crash_mem *umem = NULL, *rmem = NULL;
 	int i, nr_ranges, ret;
 
-	ret = setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
+	ret = of_kexec_setup_new_fdt(image, fdt, initrd_load_addr, initrd_len,
+				     cmdline);
 	if (ret)
 		goto out;
 
diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c
deleted file mode 100644
index ed38125e2f87..000000000000
--- a/arch/powerpc/kexec/ima.c
+++ /dev/null
@@ -1,202 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2016 IBM Corporation
- *
- * Authors:
- * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
- */
-
-#include <linux/slab.h>
-#include <linux/kexec.h>
-#include <linux/of.h>
-#include <linux/memblock.h>
-#include <linux/libfdt.h>
-
-static int get_addr_size_cells(int *addr_cells, int *size_cells)
-{
-	struct device_node *root;
-
-	root = of_find_node_by_path("/");
-	if (!root)
-		return -EINVAL;
-
-	*addr_cells = of_n_addr_cells(root);
-	*size_cells = of_n_size_cells(root);
-
-	of_node_put(root);
-
-	return 0;
-}
-
-static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
-			       size_t *size)
-{
-	int ret, addr_cells, size_cells;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	if (len < 4 * (addr_cells + size_cells))
-		return -ENOENT;
-
-	*addr = of_read_number(prop, addr_cells);
-	*size = of_read_number(prop + 4 * addr_cells, size_cells);
-
-	return 0;
-}
-
-/**
- * ima_get_kexec_buffer - get IMA buffer from the previous kernel
- * @addr:	On successful return, set to point to the buffer contents.
- * @size:	On successful return, set to the buffer size.
- *
- * Return: 0 on success, negative errno on error.
- */
-int ima_get_kexec_buffer(void **addr, size_t *size)
-{
-	int ret, len;
-	unsigned long tmp_addr;
-	size_t tmp_size;
-	const void *prop;
-
-	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
-	if (ret)
-		return ret;
-
-	*addr = __va(tmp_addr);
-	*size = tmp_size;
-
-	return 0;
-}
-
-/**
- * ima_free_kexec_buffer - free memory used by the IMA buffer
- */
-int ima_free_kexec_buffer(void)
-{
-	int ret;
-	unsigned long addr;
-	size_t size;
-	struct property *prop;
-
-	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
-	if (!prop)
-		return -ENOENT;
-
-	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
-	if (ret)
-		return ret;
-
-	ret = of_remove_property(of_chosen, prop);
-	if (ret)
-		return ret;
-
-	return memblock_free(addr, size);
-
-}
-
-/**
- * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
- *
- * The IMA measurement buffer is of no use to a subsequent kernel, so we always
- * remove it from the device tree.
- */
-void remove_ima_buffer(void *fdt, int chosen_node)
-{
-	int ret, len;
-	unsigned long addr;
-	size_t size;
-	const void *prop;
-
-	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
-	if (!prop)
-		return;
-
-	ret = do_get_kexec_buffer(prop, len, &addr, &size);
-	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
-	if (ret)
-		return;
-
-	ret = delete_fdt_mem_rsv(fdt, addr, size);
-	if (!ret)
-		pr_debug("Removed old IMA buffer reservation.\n");
-}
-
-#ifdef CONFIG_IMA_KEXEC
-static int write_number(void *p, u64 value, int cells)
-{
-	if (cells == 1) {
-		u32 tmp;
-
-		if (value > U32_MAX)
-			return -EINVAL;
-
-		tmp = cpu_to_be32(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else if (cells == 2) {
-		u64 tmp;
-
-		tmp = cpu_to_be64(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else
-		return -EINVAL;
-
-	return 0;
-}
-
-/**
- * setup_ima_buffer - add IMA buffer information to the fdt
- * @image:		kexec image being loaded.
- * @fdt:		Flattened device tree for the next kernel.
- * @chosen_node:	Offset to the chosen node.
- *
- * Return: 0 on success, or negative errno on error.
- */
-int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node)
-{
-	int ret, addr_cells, size_cells, entry_size;
-	u8 value[16];
-
-	remove_ima_buffer(fdt, chosen_node);
-	if (!image->ima_buffer_size)
-		return 0;
-
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	entry_size = 4 * (addr_cells + size_cells);
-
-	if (entry_size > sizeof(value))
-		return -EINVAL;
-
-	ret = write_number(value, image->ima_buffer_addr, addr_cells);
-	if (ret)
-		return ret;
-
-	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
-			   size_cells);
-	if (ret)
-		return ret;
-
-	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
-			  entry_size);
-	if (ret < 0)
-		return -EINVAL;
-
-	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
-			      image->ima_buffer_size);
-	if (ret)
-		return -EINVAL;
-
-	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
-		 image->ima_buffer_addr, image->ima_buffer_size);
-
-	return 0;
-}
-#endif /* CONFIG_IMA_KEXEC */
diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index efbf54f164fd..7ee4f498ca19 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/memblock.h>
 #include <linux/libfdt.h>
 #include <linux/of.h>
 #include <linux/of_fdt.h>
@@ -63,6 +64,152 @@ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned lon
 	return -ENOENT;
 }
 
+
+/**
+ * get_addr_size_cells - Get address and size of root node
+ *
+ * @addr_cells: Return address of the root node
+ * @size_cells: Return size of the root node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int get_addr_size_cells(int *addr_cells, int *size_cells)
+{
+	struct device_node *root;
+
+	root = of_find_node_by_path("/");
+	if (!root)
+		return -EINVAL;
+
+	*addr_cells = of_n_addr_cells(root);
+	*size_cells = of_n_size_cells(root);
+
+	of_node_put(root);
+
+	return 0;
+}
+
+/**
+ * do_get_kexec_buffer - Get address and size of device tree property
+ *
+ * @prop: Device tree property
+ * @len: Size of @prop
+ * @addr: Return address of the node
+ * @size: Return size of the node
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr,
+			       size_t *size)
+{
+	int ret, addr_cells, size_cells;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	if (len < 4 * (addr_cells + size_cells))
+		return -ENOENT;
+
+	*addr = of_read_number(prop, addr_cells);
+	*size = of_read_number(prop + 4 * addr_cells, size_cells);
+
+	return 0;
+}
+
+/**
+ * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
+ *
+ * @fdt: Flattened Device Tree to update
+ * @chosen_node: Offset to the chosen node in the device tree
+ *
+ * The IMA measurement buffer is of no use to a subsequent kernel, so we always
+ * remove it from the device tree.
+ */
+static void remove_ima_buffer(void *fdt, int chosen_node)
+{
+	int ret, len;
+	unsigned long addr;
+	size_t size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return;
+
+	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return;
+
+	ret = do_get_kexec_buffer(prop, len, &addr, &size);
+	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");
+	if (ret)
+		return;
+
+	ret = fdt_find_and_del_mem_rsv(fdt, addr, size);
+	if (!ret)
+		pr_debug("Removed old IMA buffer reservation.\n");
+}
+
+/**
+ * ima_get_kexec_buffer - get IMA buffer from the previous kernel
+ * @addr:	On successful return, set to point to the buffer contents.
+ * @size:	On successful return, set to the buffer size.
+ *
+ * Return: 0 on success, negative errno on error.
+ */
+int ima_get_kexec_buffer(void **addr, size_t *size)
+{
+	int ret, len;
+	unsigned long tmp_addr;
+	size_t tmp_size;
+	const void *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size);
+	if (ret)
+		return ret;
+
+	*addr = __va(tmp_addr);
+	*size = tmp_size;
+
+	return 0;
+}
+
+/**
+ * ima_free_kexec_buffer - free memory used by the IMA buffer
+ */
+int ima_free_kexec_buffer(void)
+{
+	int ret;
+	unsigned long addr;
+	size_t size;
+	struct property *prop;
+
+	if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC))
+		return -ENOTSUPP;
+
+	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);
+	if (!prop)
+		return -ENOENT;
+
+	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);
+	if (ret)
+		return ret;
+
+	ret = of_remove_property(of_chosen, prop);
+	if (ret)
+		return ret;
+
+	return memblock_free(addr, size);
+
+}
+
 #ifdef CONFIG_IMA_KEXEC
 /**
  * of_ima_add_kexec_buffer - Add IMA buffer for next kernel
@@ -84,6 +231,93 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 
 	return 0;
 }
+
+/**
+ * write_number - Convert number to big-endian format
+ *
+ * @p:		Buffer to write the number to
+ * @value:	Number to convert
+ * @cells:	Number of cells
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int write_number(void *p, u64 value, int cells)
+{
+	if (cells == 1) {
+		u32 tmp;
+
+		if (value > U32_MAX)
+			return -EINVAL;
+
+		tmp = cpu_to_be32(value);
+		memcpy(p, &tmp, sizeof(tmp));
+	} else if (cells == 2) {
+		u64 tmp;
+
+		tmp = cpu_to_be64(value);
+		memcpy(p, &tmp, sizeof(tmp));
+	} else
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * setup_ima_buffer - add IMA buffer information to the fdt
+ * @image:		kexec image being loaded.
+ * @fdt:		Flattened device tree for the next kernel.
+ * @chosen_node:	Offset to the chosen node.
+ *
+ * Return: 0 on success, or negative errno on error.
+ */
+static int setup_ima_buffer(const struct kimage *image, void *fdt,
+			    int chosen_node)
+{
+	int ret, addr_cells, size_cells, entry_size;
+	u8 value[16];
+
+	if (!image->ima_buffer_size)
+		return 0;
+
+	ret = get_addr_size_cells(&addr_cells, &size_cells);
+	if (ret)
+		return ret;
+
+	entry_size = 4 * (addr_cells + size_cells);
+
+	if (entry_size > sizeof(value))
+		return -EINVAL;
+
+	ret = write_number(value, image->ima_buffer_addr, addr_cells);
+	if (ret)
+		return ret;
+
+	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
+			   size_cells);
+	if (ret)
+		return ret;
+
+	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
+			  entry_size);
+	if (ret < 0)
+		return -EINVAL;
+
+	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,
+			      image->ima_buffer_size);
+	if (ret)
+		return -EINVAL;
+
+	pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n",
+		 image->ima_buffer_addr, image->ima_buffer_size);
+
+	return 0;
+}
+#else /* CONFIG_IMA_KEXEC */
+static inline int setup_ima_buffer(const struct kimage *image, void *fdt,
+				   int chosen_node)
+{
+	return 0;
+}
 #endif /* CONFIG_IMA_KEXEC */
 
 /*
@@ -250,6 +484,11 @@ int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 	}
 
 	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);
+	if (ret)
+		goto out;
+
+	remove_ima_buffer(fdt, chosen_node);
+	ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen"));
 
 out:
 	if (ret)
diff --git a/include/linux/of.h b/include/linux/of.h
index 551117c32773..19f77dd12507 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -569,6 +569,8 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 			    unsigned long load_addr, size_t size);
 #endif /* CONFIG_IMA_KEXEC */
 
+int ima_get_kexec_buffer(void **addr, size_t *size);
+int ima_free_kexec_buffer(void);
 #else /* CONFIG_OF */
 
 static inline void of_core_init(void)
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index aa312472c7c5..fdae37fa7051 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -24,10 +24,6 @@
 
 #include "../integrity.h"
 
-#ifdef CONFIG_HAVE_IMA_KEXEC
-#include <asm/ima.h>
-#endif
-
 enum ima_show_type { IMA_SHOW_BINARY, IMA_SHOW_BINARY_NO_FIELD_LEN,
 		     IMA_SHOW_BINARY_OLD_STRING_FMT, IMA_SHOW_ASCII };
 enum tpm_pcrs { TPM_PCR0 = 0, TPM_PCR8 = 8, TPM_PCR10 = 10 };
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 07/12] kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

fdt_appendprop_addrrange() function adds a property, with the given name,
to the device tree at the given node offset, and also sets the address
and size of the property.  This function should be used to add
"linux,ima-kexec-buffer" property to the device tree and set the address
and size of the IMA measurement buffer, instead of using custom function.

Use fdt_appendprop_addrrange() to add  "linux,ima-kexec-buffer" property
to the device tree.  This property holds the address and size of
the IMA measurement buffer that needs to be passed from the current
kernel to the next kernel across kexec system call.

Remove custom code that is used in setup_ima_buffer() to add
"linux,ima-kexec-buffer" property to the device tree.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 drivers/of/kexec.c | 57 ++++------------------------------------------
 1 file changed, 5 insertions(+), 52 deletions(-)

diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 7ee4f498ca19..5ae0e5d90f55 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -232,36 +232,6 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 	return 0;
 }
 
-/**
- * write_number - Convert number to big-endian format
- *
- * @p:		Buffer to write the number to
- * @value:	Number to convert
- * @cells:	Number of cells
- *
- * Return: 0 on success, or negative errno on error.
- */
-static int write_number(void *p, u64 value, int cells)
-{
-	if (cells == 1) {
-		u32 tmp;
-
-		if (value > U32_MAX)
-			return -EINVAL;
-
-		tmp = cpu_to_be32(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else if (cells == 2) {
-		u64 tmp;
-
-		tmp = cpu_to_be64(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else
-		return -EINVAL;
-
-	return 0;
-}
-
 /**
  * setup_ima_buffer - add IMA buffer information to the fdt
  * @image:		kexec image being loaded.
@@ -273,32 +243,15 @@ static int write_number(void *p, u64 value, int cells)
 static int setup_ima_buffer(const struct kimage *image, void *fdt,
 			    int chosen_node)
 {
-	int ret, addr_cells, size_cells, entry_size;
-	u8 value[16];
+	int ret;
 
 	if (!image->ima_buffer_size)
 		return 0;
 
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	entry_size = 4 * (addr_cells + size_cells);
-
-	if (entry_size > sizeof(value))
-		return -EINVAL;
-
-	ret = write_number(value, image->ima_buffer_addr, addr_cells);
-	if (ret)
-		return ret;
-
-	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
-			   size_cells);
-	if (ret)
-		return ret;
-
-	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
-			  entry_size);
+	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				       "linux,ima-kexec-buffer",
+				       image->ima_buffer_addr,
+				       image->ima_buffer_size);
 	if (ret < 0)
 		return -EINVAL;
 
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 07/12] kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

fdt_appendprop_addrrange() function adds a property, with the given name,
to the device tree at the given node offset, and also sets the address
and size of the property.  This function should be used to add
"linux,ima-kexec-buffer" property to the device tree and set the address
and size of the IMA measurement buffer, instead of using custom function.

Use fdt_appendprop_addrrange() to add  "linux,ima-kexec-buffer" property
to the device tree.  This property holds the address and size of
the IMA measurement buffer that needs to be passed from the current
kernel to the next kernel across kexec system call.

Remove custom code that is used in setup_ima_buffer() to add
"linux,ima-kexec-buffer" property to the device tree.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 drivers/of/kexec.c | 57 ++++------------------------------------------
 1 file changed, 5 insertions(+), 52 deletions(-)

diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 7ee4f498ca19..5ae0e5d90f55 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -232,36 +232,6 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 	return 0;
 }
 
-/**
- * write_number - Convert number to big-endian format
- *
- * @p:		Buffer to write the number to
- * @value:	Number to convert
- * @cells:	Number of cells
- *
- * Return: 0 on success, or negative errno on error.
- */
-static int write_number(void *p, u64 value, int cells)
-{
-	if (cells == 1) {
-		u32 tmp;
-
-		if (value > U32_MAX)
-			return -EINVAL;
-
-		tmp = cpu_to_be32(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else if (cells == 2) {
-		u64 tmp;
-
-		tmp = cpu_to_be64(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else
-		return -EINVAL;
-
-	return 0;
-}
-
 /**
  * setup_ima_buffer - add IMA buffer information to the fdt
  * @image:		kexec image being loaded.
@@ -273,32 +243,15 @@ static int write_number(void *p, u64 value, int cells)
 static int setup_ima_buffer(const struct kimage *image, void *fdt,
 			    int chosen_node)
 {
-	int ret, addr_cells, size_cells, entry_size;
-	u8 value[16];
+	int ret;
 
 	if (!image->ima_buffer_size)
 		return 0;
 
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	entry_size = 4 * (addr_cells + size_cells);
-
-	if (entry_size > sizeof(value))
-		return -EINVAL;
-
-	ret = write_number(value, image->ima_buffer_addr, addr_cells);
-	if (ret)
-		return ret;
-
-	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
-			   size_cells);
-	if (ret)
-		return ret;
-
-	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
-			  entry_size);
+	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				       "linux,ima-kexec-buffer",
+				       image->ima_buffer_addr,
+				       image->ima_buffer_size);
 	if (ret < 0)
 		return -EINVAL;
 
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 07/12] kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

fdt_appendprop_addrrange() function adds a property, with the given name,
to the device tree at the given node offset, and also sets the address
and size of the property.  This function should be used to add
"linux,ima-kexec-buffer" property to the device tree and set the address
and size of the IMA measurement buffer, instead of using custom function.

Use fdt_appendprop_addrrange() to add  "linux,ima-kexec-buffer" property
to the device tree.  This property holds the address and size of
the IMA measurement buffer that needs to be passed from the current
kernel to the next kernel across kexec system call.

Remove custom code that is used in setup_ima_buffer() to add
"linux,ima-kexec-buffer" property to the device tree.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 drivers/of/kexec.c | 57 ++++------------------------------------------
 1 file changed, 5 insertions(+), 52 deletions(-)

diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 7ee4f498ca19..5ae0e5d90f55 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -232,36 +232,6 @@ int of_ima_add_kexec_buffer(struct kimage *image,
 	return 0;
 }
 
-/**
- * write_number - Convert number to big-endian format
- *
- * @p:		Buffer to write the number to
- * @value:	Number to convert
- * @cells:	Number of cells
- *
- * Return: 0 on success, or negative errno on error.
- */
-static int write_number(void *p, u64 value, int cells)
-{
-	if (cells == 1) {
-		u32 tmp;
-
-		if (value > U32_MAX)
-			return -EINVAL;
-
-		tmp = cpu_to_be32(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else if (cells == 2) {
-		u64 tmp;
-
-		tmp = cpu_to_be64(value);
-		memcpy(p, &tmp, sizeof(tmp));
-	} else
-		return -EINVAL;
-
-	return 0;
-}
-
 /**
  * setup_ima_buffer - add IMA buffer information to the fdt
  * @image:		kexec image being loaded.
@@ -273,32 +243,15 @@ static int write_number(void *p, u64 value, int cells)
 static int setup_ima_buffer(const struct kimage *image, void *fdt,
 			    int chosen_node)
 {
-	int ret, addr_cells, size_cells, entry_size;
-	u8 value[16];
+	int ret;
 
 	if (!image->ima_buffer_size)
 		return 0;
 
-	ret = get_addr_size_cells(&addr_cells, &size_cells);
-	if (ret)
-		return ret;
-
-	entry_size = 4 * (addr_cells + size_cells);
-
-	if (entry_size > sizeof(value))
-		return -EINVAL;
-
-	ret = write_number(value, image->ima_buffer_addr, addr_cells);
-	if (ret)
-		return ret;
-
-	ret = write_number(value + 4 * addr_cells, image->ima_buffer_size,
-			   size_cells);
-	if (ret)
-		return ret;
-
-	ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value,
-			  entry_size);
+	ret = fdt_appendprop_addrrange(fdt, 0, chosen_node,
+				       "linux,ima-kexec-buffer",
+				       image->ima_buffer_addr,
+				       image->ima_buffer_size);
 	if (ret < 0)
 		return -EINVAL;
 
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 08/12] powerpc: Delete unused function delete_fdt_mem_rsv()
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

delete_fdt_mem_rsv() defined in "arch/powerpc/kexec/file_load.c"
has been renamed to fdt_find_and_del_mem_rsv(), and moved to
"drivers/of/kexec.c".

Remove delete_fdt_mem_rsv() in "arch/powerpc/kexec/file_load.c".

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/include/asm/kexec.h |  1 -
 arch/powerpc/kexec/file_load.c   | 32 --------------------------------
 2 files changed, 33 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 939bc40dfa62..2c0be93d239a 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -118,7 +118,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 int setup_purgatory(struct kimage *image, const void *slave_code,
 		    const void *fdt, unsigned long kernel_load_addr,
 		    unsigned long fdt_load_addr);
-int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 
 #ifdef CONFIG_PPC64
 struct kexec_buf;
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 5dd3a9c45a2d..036c8fb48fc3 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -108,35 +108,3 @@ int setup_purgatory(struct kimage *image, const void *slave_code,
 
 	return 0;
 }
-
-/**
- * delete_fdt_mem_rsv - delete memory reservation with given address and size
- *
- * Return: 0 on success, or negative errno on error.
- */
-int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
-{
-	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
-
-	for (i = 0; i < num_rsvs; i++) {
-		uint64_t rsv_start, rsv_size;
-
-		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
-		if (ret) {
-			pr_err("Malformed device tree.\n");
-			return -EINVAL;
-		}
-
-		if (rsv_start == start && rsv_size == size) {
-			ret = fdt_del_mem_rsv(fdt, i);
-			if (ret) {
-				pr_err("Error deleting device tree reservation.\n");
-				return -EINVAL;
-			}
-
-			return 0;
-		}
-	}
-
-	return -ENOENT;
-}
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 08/12] powerpc: Delete unused function delete_fdt_mem_rsv()
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

delete_fdt_mem_rsv() defined in "arch/powerpc/kexec/file_load.c"
has been renamed to fdt_find_and_del_mem_rsv(), and moved to
"drivers/of/kexec.c".

Remove delete_fdt_mem_rsv() in "arch/powerpc/kexec/file_load.c".

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/include/asm/kexec.h |  1 -
 arch/powerpc/kexec/file_load.c   | 32 --------------------------------
 2 files changed, 33 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 939bc40dfa62..2c0be93d239a 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -118,7 +118,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 int setup_purgatory(struct kimage *image, const void *slave_code,
 		    const void *fdt, unsigned long kernel_load_addr,
 		    unsigned long fdt_load_addr);
-int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 
 #ifdef CONFIG_PPC64
 struct kexec_buf;
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 5dd3a9c45a2d..036c8fb48fc3 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -108,35 +108,3 @@ int setup_purgatory(struct kimage *image, const void *slave_code,
 
 	return 0;
 }
-
-/**
- * delete_fdt_mem_rsv - delete memory reservation with given address and size
- *
- * Return: 0 on success, or negative errno on error.
- */
-int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
-{
-	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
-
-	for (i = 0; i < num_rsvs; i++) {
-		uint64_t rsv_start, rsv_size;
-
-		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
-		if (ret) {
-			pr_err("Malformed device tree.\n");
-			return -EINVAL;
-		}
-
-		if (rsv_start == start && rsv_size == size) {
-			ret = fdt_del_mem_rsv(fdt, i);
-			if (ret) {
-				pr_err("Error deleting device tree reservation.\n");
-				return -EINVAL;
-			}
-
-			return 0;
-		}
-	}
-
-	return -ENOENT;
-}
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 08/12] powerpc: Delete unused function delete_fdt_mem_rsv()
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

delete_fdt_mem_rsv() defined in "arch/powerpc/kexec/file_load.c"
has been renamed to fdt_find_and_del_mem_rsv(), and moved to
"drivers/of/kexec.c".

Remove delete_fdt_mem_rsv() in "arch/powerpc/kexec/file_load.c".

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/powerpc/include/asm/kexec.h |  1 -
 arch/powerpc/kexec/file_load.c   | 32 --------------------------------
 2 files changed, 33 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 939bc40dfa62..2c0be93d239a 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -118,7 +118,6 @@ char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 int setup_purgatory(struct kimage *image, const void *slave_code,
 		    const void *fdt, unsigned long kernel_load_addr,
 		    unsigned long fdt_load_addr);
-int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 
 #ifdef CONFIG_PPC64
 struct kexec_buf;
diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c
index 5dd3a9c45a2d..036c8fb48fc3 100644
--- a/arch/powerpc/kexec/file_load.c
+++ b/arch/powerpc/kexec/file_load.c
@@ -108,35 +108,3 @@ int setup_purgatory(struct kimage *image, const void *slave_code,
 
 	return 0;
 }
-
-/**
- * delete_fdt_mem_rsv - delete memory reservation with given address and size
- *
- * Return: 0 on success, or negative errno on error.
- */
-int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size)
-{
-	int i, ret, num_rsvs = fdt_num_mem_rsv(fdt);
-
-	for (i = 0; i < num_rsvs; i++) {
-		uint64_t rsv_start, rsv_size;
-
-		ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size);
-		if (ret) {
-			pr_err("Malformed device tree.\n");
-			return -EINVAL;
-		}
-
-		if (rsv_start == start && rsv_size == size) {
-			ret = fdt_del_mem_rsv(fdt, i);
-			if (ret) {
-				pr_err("Error deleting device tree reservation.\n");
-				return -EINVAL;
-			}
-
-			return 0;
-		}
-	}
-
-	return -ENOENT;
-}
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 09/12] of: Define functions to allocate and free FDT
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

Kernel components that use Flattened Device Tree (FDT) allocate kernel
memory and call fdt_open_into() to reorganize the tree into a form
suitable for the read-write operations.  These operations can be
combined into a single function to allocate and initialize the FDT
so the different architecures do not have to duplicate the code.

Define of_alloc_and_init_fdt() and of_free_fdt() in drivers/of/kexec.c
to allocate and initialize FDT, and to free the FDT buffer respectively.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Suggested-by: Joe Perches <joe@perches.com>
---
 drivers/of/kexec.c | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/of.h |  2 ++
 2 files changed, 39 insertions(+)

diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 5ae0e5d90f55..197e71104f47 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/mm.h>
 #include <linux/memblock.h>
 #include <linux/libfdt.h>
 #include <linux/of.h>
@@ -28,6 +29,42 @@
 #define FDT_PROP_RNG_SEED	"rng-seed"
 #define RNG_SEED_SIZE		128
 
+/**
+ * of_alloc_and_init_fdt - Allocate and initialize a Flattened device tree
+ *
+ * @fdt_size:	Flattened device tree size
+ *
+ * Return the allocated FDT buffer on success, or NULL on error.
+ */
+void *of_alloc_and_init_fdt(unsigned int fdt_size)
+{
+	void *fdt;
+	int ret;
+
+	fdt = kvmalloc(fdt_size, GFP_KERNEL);
+	if (!fdt)
+		return NULL;
+
+	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
+	if (ret < 0) {
+		pr_err("Error setting up the new device tree.\n");
+		kvfree(fdt);
+		fdt = NULL;
+	}
+
+	return fdt;
+}
+
+/**
+ * of_free_fdt - Free the buffer for Flattened device tree
+ *
+ * @fdt:	Flattened device tree buffer to free
+ */
+void of_free_fdt(void *fdt)
+{
+	kvfree(fdt);
+}
+
 /**
  * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
  *
diff --git a/include/linux/of.h b/include/linux/of.h
index 19f77dd12507..9f0261761e28 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -563,6 +563,8 @@ struct kimage;
 int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 			   unsigned long initrd_load_addr, unsigned long initrd_len,
 			   const char *cmdline);
+void *of_alloc_and_init_fdt(unsigned int fdt_size);
+void of_free_fdt(void *fdt);
 
 #ifdef CONFIG_IMA_KEXEC
 int of_ima_add_kexec_buffer(struct kimage *image,
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 09/12] of: Define functions to allocate and free FDT
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

Kernel components that use Flattened Device Tree (FDT) allocate kernel
memory and call fdt_open_into() to reorganize the tree into a form
suitable for the read-write operations.  These operations can be
combined into a single function to allocate and initialize the FDT
so the different architecures do not have to duplicate the code.

Define of_alloc_and_init_fdt() and of_free_fdt() in drivers/of/kexec.c
to allocate and initialize FDT, and to free the FDT buffer respectively.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Suggested-by: Joe Perches <joe@perches.com>
---
 drivers/of/kexec.c | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/of.h |  2 ++
 2 files changed, 39 insertions(+)

diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 5ae0e5d90f55..197e71104f47 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/mm.h>
 #include <linux/memblock.h>
 #include <linux/libfdt.h>
 #include <linux/of.h>
@@ -28,6 +29,42 @@
 #define FDT_PROP_RNG_SEED	"rng-seed"
 #define RNG_SEED_SIZE		128
 
+/**
+ * of_alloc_and_init_fdt - Allocate and initialize a Flattened device tree
+ *
+ * @fdt_size:	Flattened device tree size
+ *
+ * Return the allocated FDT buffer on success, or NULL on error.
+ */
+void *of_alloc_and_init_fdt(unsigned int fdt_size)
+{
+	void *fdt;
+	int ret;
+
+	fdt = kvmalloc(fdt_size, GFP_KERNEL);
+	if (!fdt)
+		return NULL;
+
+	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
+	if (ret < 0) {
+		pr_err("Error setting up the new device tree.\n");
+		kvfree(fdt);
+		fdt = NULL;
+	}
+
+	return fdt;
+}
+
+/**
+ * of_free_fdt - Free the buffer for Flattened device tree
+ *
+ * @fdt:	Flattened device tree buffer to free
+ */
+void of_free_fdt(void *fdt)
+{
+	kvfree(fdt);
+}
+
 /**
  * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
  *
diff --git a/include/linux/of.h b/include/linux/of.h
index 19f77dd12507..9f0261761e28 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -563,6 +563,8 @@ struct kimage;
 int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 			   unsigned long initrd_load_addr, unsigned long initrd_len,
 			   const char *cmdline);
+void *of_alloc_and_init_fdt(unsigned int fdt_size);
+void of_free_fdt(void *fdt);
 
 #ifdef CONFIG_IMA_KEXEC
 int of_ima_add_kexec_buffer(struct kimage *image,
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 09/12] of: Define functions to allocate and free FDT
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

Kernel components that use Flattened Device Tree (FDT) allocate kernel
memory and call fdt_open_into() to reorganize the tree into a form
suitable for the read-write operations.  These operations can be
combined into a single function to allocate and initialize the FDT
so the different architecures do not have to duplicate the code.

Define of_alloc_and_init_fdt() and of_free_fdt() in drivers/of/kexec.c
to allocate and initialize FDT, and to free the FDT buffer respectively.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Suggested-by: Joe Perches <joe@perches.com>
---
 drivers/of/kexec.c | 37 +++++++++++++++++++++++++++++++++++++
 include/linux/of.h |  2 ++
 2 files changed, 39 insertions(+)

diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c
index 5ae0e5d90f55..197e71104f47 100644
--- a/drivers/of/kexec.c
+++ b/drivers/of/kexec.c
@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/kexec.h>
+#include <linux/mm.h>
 #include <linux/memblock.h>
 #include <linux/libfdt.h>
 #include <linux/of.h>
@@ -28,6 +29,42 @@
 #define FDT_PROP_RNG_SEED	"rng-seed"
 #define RNG_SEED_SIZE		128
 
+/**
+ * of_alloc_and_init_fdt - Allocate and initialize a Flattened device tree
+ *
+ * @fdt_size:	Flattened device tree size
+ *
+ * Return the allocated FDT buffer on success, or NULL on error.
+ */
+void *of_alloc_and_init_fdt(unsigned int fdt_size)
+{
+	void *fdt;
+	int ret;
+
+	fdt = kvmalloc(fdt_size, GFP_KERNEL);
+	if (!fdt)
+		return NULL;
+
+	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
+	if (ret < 0) {
+		pr_err("Error setting up the new device tree.\n");
+		kvfree(fdt);
+		fdt = NULL;
+	}
+
+	return fdt;
+}
+
+/**
+ * of_free_fdt - Free the buffer for Flattened device tree
+ *
+ * @fdt:	Flattened device tree buffer to free
+ */
+void of_free_fdt(void *fdt)
+{
+	kvfree(fdt);
+}
+
 /**
  * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
  *
diff --git a/include/linux/of.h b/include/linux/of.h
index 19f77dd12507..9f0261761e28 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -563,6 +563,8 @@ struct kimage;
 int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
 			   unsigned long initrd_load_addr, unsigned long initrd_len,
 			   const char *cmdline);
+void *of_alloc_and_init_fdt(unsigned int fdt_size);
+void of_free_fdt(void *fdt);
 
 #ifdef CONFIG_IMA_KEXEC
 int of_ima_add_kexec_buffer(struct kimage *image,
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 10/12] arm64: Use OF alloc and free functions for FDT
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

of_alloc_and_init_fdt() and of_free_fdt() have been defined in
drivers/of/kexec.c to allocate and free memory for FDT.

Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
initialize the FDT, and to free the FDT respectively.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
---
 arch/arm64/kernel/machine_kexec_file.c | 37 +++++++-------------------
 1 file changed, 10 insertions(+), 27 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 7da22bb7b9d5..7d6cc478f73c 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -29,7 +29,7 @@ const struct kexec_file_ops * const kexec_file_loaders[] = {
 
 int arch_kimage_file_post_load_cleanup(struct kimage *image)
 {
-	vfree(image->arch.dtb);
+	of_free_fdt(image->arch.dtb);
 	image->arch.dtb = NULL;
 
 	vfree(image->arch.elf_headers);
@@ -57,36 +57,19 @@ static int create_dtb(struct kimage *image,
 	cmdline_len = cmdline ? strlen(cmdline) : 0;
 	buf_size = fdt_totalsize(initial_boot_params)
 			+ cmdline_len + DTB_EXTRA_SPACE;
-
-	for (;;) {
-		buf = vmalloc(buf_size);
-		if (!buf)
-			return -ENOMEM;
-
-		/* duplicate a device tree blob */
-		ret = fdt_open_into(initial_boot_params, buf, buf_size);
-		if (ret)
-			return -EINVAL;
-
-		ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
+	buf = of_alloc_and_init_fdt(buf_size);
+	if (!buf)
+		return -ENOMEM;
+	ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
 					     initrd_len, cmdline);
-		if (ret) {
-			vfree(buf);
-			if (ret == -ENOMEM) {
-				/* unlikely, but just in case */
-				buf_size += DTB_EXTRA_SPACE;
-				continue;
-			} else {
-				return ret;
-			}
-		}
-
+	if (!ret) {
 		/* trim it */
 		fdt_pack(buf);
 		*dtb = buf;
+	} else
+		of_free_fdt(buf);
 
-		return 0;
-	}
+	return ret;
 }
 
 static int prepare_elf_headers(void **addr, unsigned long *sz)
@@ -224,6 +207,6 @@ int load_other_segments(struct kimage *image,
 
 out_err:
 	image->nr_segments = orig_segments;
-	vfree(dtb);
+	of_free_fdt(dtb);
 	return ret;
 }
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 10/12] arm64: Use OF alloc and free functions for FDT
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

of_alloc_and_init_fdt() and of_free_fdt() have been defined in
drivers/of/kexec.c to allocate and free memory for FDT.

Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
initialize the FDT, and to free the FDT respectively.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
---
 arch/arm64/kernel/machine_kexec_file.c | 37 +++++++-------------------
 1 file changed, 10 insertions(+), 27 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 7da22bb7b9d5..7d6cc478f73c 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -29,7 +29,7 @@ const struct kexec_file_ops * const kexec_file_loaders[] = {
 
 int arch_kimage_file_post_load_cleanup(struct kimage *image)
 {
-	vfree(image->arch.dtb);
+	of_free_fdt(image->arch.dtb);
 	image->arch.dtb = NULL;
 
 	vfree(image->arch.elf_headers);
@@ -57,36 +57,19 @@ static int create_dtb(struct kimage *image,
 	cmdline_len = cmdline ? strlen(cmdline) : 0;
 	buf_size = fdt_totalsize(initial_boot_params)
 			+ cmdline_len + DTB_EXTRA_SPACE;
-
-	for (;;) {
-		buf = vmalloc(buf_size);
-		if (!buf)
-			return -ENOMEM;
-
-		/* duplicate a device tree blob */
-		ret = fdt_open_into(initial_boot_params, buf, buf_size);
-		if (ret)
-			return -EINVAL;
-
-		ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
+	buf = of_alloc_and_init_fdt(buf_size);
+	if (!buf)
+		return -ENOMEM;
+	ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
 					     initrd_len, cmdline);
-		if (ret) {
-			vfree(buf);
-			if (ret == -ENOMEM) {
-				/* unlikely, but just in case */
-				buf_size += DTB_EXTRA_SPACE;
-				continue;
-			} else {
-				return ret;
-			}
-		}
-
+	if (!ret) {
 		/* trim it */
 		fdt_pack(buf);
 		*dtb = buf;
+	} else
+		of_free_fdt(buf);
 
-		return 0;
-	}
+	return ret;
 }
 
 static int prepare_elf_headers(void **addr, unsigned long *sz)
@@ -224,6 +207,6 @@ int load_other_segments(struct kimage *image,
 
 out_err:
 	image->nr_segments = orig_segments;
-	vfree(dtb);
+	of_free_fdt(dtb);
 	return ret;
 }
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 10/12] arm64: Use OF alloc and free functions for FDT
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

of_alloc_and_init_fdt() and of_free_fdt() have been defined in
drivers/of/kexec.c to allocate and free memory for FDT.

Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
initialize the FDT, and to free the FDT respectively.

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
---
 arch/arm64/kernel/machine_kexec_file.c | 37 +++++++-------------------
 1 file changed, 10 insertions(+), 27 deletions(-)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 7da22bb7b9d5..7d6cc478f73c 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -29,7 +29,7 @@ const struct kexec_file_ops * const kexec_file_loaders[] = {
 
 int arch_kimage_file_post_load_cleanup(struct kimage *image)
 {
-	vfree(image->arch.dtb);
+	of_free_fdt(image->arch.dtb);
 	image->arch.dtb = NULL;
 
 	vfree(image->arch.elf_headers);
@@ -57,36 +57,19 @@ static int create_dtb(struct kimage *image,
 	cmdline_len = cmdline ? strlen(cmdline) : 0;
 	buf_size = fdt_totalsize(initial_boot_params)
 			+ cmdline_len + DTB_EXTRA_SPACE;
-
-	for (;;) {
-		buf = vmalloc(buf_size);
-		if (!buf)
-			return -ENOMEM;
-
-		/* duplicate a device tree blob */
-		ret = fdt_open_into(initial_boot_params, buf, buf_size);
-		if (ret)
-			return -EINVAL;
-
-		ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
+	buf = of_alloc_and_init_fdt(buf_size);
+	if (!buf)
+		return -ENOMEM;
+	ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
 					     initrd_len, cmdline);
-		if (ret) {
-			vfree(buf);
-			if (ret == -ENOMEM) {
-				/* unlikely, but just in case */
-				buf_size += DTB_EXTRA_SPACE;
-				continue;
-			} else {
-				return ret;
-			}
-		}
-
+	if (!ret) {
 		/* trim it */
 		fdt_pack(buf);
 		*dtb = buf;
+	} else
+		of_free_fdt(buf);
 
-		return 0;
-	}
+	return ret;
 }
 
 static int prepare_elf_headers(void **addr, unsigned long *sz)
@@ -224,6 +207,6 @@ int load_other_segments(struct kimage *image,
 
 out_err:
 	image->nr_segments = orig_segments;
-	vfree(dtb);
+	of_free_fdt(dtb);
 	return ret;
 }
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

of_alloc_and_init_fdt() and of_free_fdt() have been defined in
drivers/of/kexec.c to allocate and free memory for FDT.

Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
initialize the FDT, and to free the FDT respectively.

powerpc sets the FDT address in image_loader_data field in
"struct kimage" and the memory is freed in
kimage_file_post_load_cleanup().  This cleanup function uses kfree()
to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
for allocation, the buffer needs to be freed using kvfree().

Define "fdt" field in "struct kimage_arch" for powerpc to store
the address of FDT, and free the memory in powerpc specific
arch_kimage_file_post_load_cleanup().

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/powerpc/include/asm/kexec.h  |  2 ++
 arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
 arch/powerpc/kexec/file_load_64.c |  3 +++
 3 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 2c0be93d239a..d7d13cac4d31 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -111,6 +111,8 @@ struct kimage_arch {
 	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
+
+	void *fdt;
 };
 
 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
index d0e459bb2f05..51d2d8eb6c1b 100644
--- a/arch/powerpc/kexec/elf_64.c
+++ b/arch/powerpc/kexec/elf_64.c
@@ -19,6 +19,7 @@
 #include <linux/kexec.h>
 #include <linux/libfdt.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/slab.h>
 #include <linux/types.h>
@@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	unsigned int fdt_size;
 	unsigned long kernel_load_addr;
 	unsigned long initrd_load_addr = 0, fdt_load_addr;
-	void *fdt;
+	void *fdt = NULL;
 	const void *slave_code;
 	struct elfhdr ehdr;
 	char *modified_cmdline = NULL;
@@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	}
 
 	fdt_size = fdt_totalsize(initial_boot_params) * 2;
-	fdt = kmalloc(fdt_size, GFP_KERNEL);
+	fdt = of_alloc_and_init_fdt(fdt_size);
 	if (!fdt) {
 		pr_err("Not enough memory for the device tree.\n");
 		ret = -ENOMEM;
 		goto out;
 	}
-	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
-	if (ret < 0) {
-		pr_err("Error setting up the new device tree.\n");
-		ret = -EINVAL;
-		goto out;
-	}
 
 	ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
 				  initrd_len, cmdline);
@@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	ret = kexec_add_buffer(&kbuf);
 	if (ret)
 		goto out;
+
+	/* FDT will be freed in arch_kimage_file_post_load_cleanup */
+	image->arch.fdt = fdt;
+
 	fdt_load_addr = kbuf.mem;
 
 	pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
@@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	kfree(modified_cmdline);
 	kexec_free_elf_info(&elf_info);
 
-	/* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
-	return ret ? ERR_PTR(ret) : fdt;
+	/*
+	 * Once FDT buffer has been successfully passed to kexec_add_buffer(),
+	 * the FDT buffer address is saved in image->arch.fdt. In that case,
+	 * the memory cannot be freed here in case of any other error.
+	 */
+	if (ret && !image->arch.fdt)
+		of_free_fdt(fdt);
+
+	return ret ? ERR_PTR(ret) : NULL;
 }
 
 const struct kexec_file_ops kexec_elf64_ops = {
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index 3cab318aa3b9..d9d5b5569a6d 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	image->arch.elf_headers = NULL;
 	image->arch.elf_headers_sz = 0;
 
+	of_free_fdt(image->arch.fdt);
+	image->arch.fdt = NULL;
+
 	return kexec_image_post_load_cleanup_default(image);
 }
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

of_alloc_and_init_fdt() and of_free_fdt() have been defined in
drivers/of/kexec.c to allocate and free memory for FDT.

Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
initialize the FDT, and to free the FDT respectively.

powerpc sets the FDT address in image_loader_data field in
"struct kimage" and the memory is freed in
kimage_file_post_load_cleanup().  This cleanup function uses kfree()
to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
for allocation, the buffer needs to be freed using kvfree().

Define "fdt" field in "struct kimage_arch" for powerpc to store
the address of FDT, and free the memory in powerpc specific
arch_kimage_file_post_load_cleanup().

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/powerpc/include/asm/kexec.h  |  2 ++
 arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
 arch/powerpc/kexec/file_load_64.c |  3 +++
 3 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 2c0be93d239a..d7d13cac4d31 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -111,6 +111,8 @@ struct kimage_arch {
 	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
+
+	void *fdt;
 };
 
 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
index d0e459bb2f05..51d2d8eb6c1b 100644
--- a/arch/powerpc/kexec/elf_64.c
+++ b/arch/powerpc/kexec/elf_64.c
@@ -19,6 +19,7 @@
 #include <linux/kexec.h>
 #include <linux/libfdt.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/slab.h>
 #include <linux/types.h>
@@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	unsigned int fdt_size;
 	unsigned long kernel_load_addr;
 	unsigned long initrd_load_addr = 0, fdt_load_addr;
-	void *fdt;
+	void *fdt = NULL;
 	const void *slave_code;
 	struct elfhdr ehdr;
 	char *modified_cmdline = NULL;
@@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	}
 
 	fdt_size = fdt_totalsize(initial_boot_params) * 2;
-	fdt = kmalloc(fdt_size, GFP_KERNEL);
+	fdt = of_alloc_and_init_fdt(fdt_size);
 	if (!fdt) {
 		pr_err("Not enough memory for the device tree.\n");
 		ret = -ENOMEM;
 		goto out;
 	}
-	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
-	if (ret < 0) {
-		pr_err("Error setting up the new device tree.\n");
-		ret = -EINVAL;
-		goto out;
-	}
 
 	ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
 				  initrd_len, cmdline);
@@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	ret = kexec_add_buffer(&kbuf);
 	if (ret)
 		goto out;
+
+	/* FDT will be freed in arch_kimage_file_post_load_cleanup */
+	image->arch.fdt = fdt;
+
 	fdt_load_addr = kbuf.mem;
 
 	pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
@@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	kfree(modified_cmdline);
 	kexec_free_elf_info(&elf_info);
 
-	/* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
-	return ret ? ERR_PTR(ret) : fdt;
+	/*
+	 * Once FDT buffer has been successfully passed to kexec_add_buffer(),
+	 * the FDT buffer address is saved in image->arch.fdt. In that case,
+	 * the memory cannot be freed here in case of any other error.
+	 */
+	if (ret && !image->arch.fdt)
+		of_free_fdt(fdt);
+
+	return ret ? ERR_PTR(ret) : NULL;
 }
 
 const struct kexec_file_ops kexec_elf64_ops = {
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index 3cab318aa3b9..d9d5b5569a6d 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	image->arch.elf_headers = NULL;
 	image->arch.elf_headers_sz = 0;
 
+	of_free_fdt(image->arch.fdt);
+	image->arch.fdt = NULL;
+
 	return kexec_image_post_load_cleanup_default(image);
 }
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

of_alloc_and_init_fdt() and of_free_fdt() have been defined in
drivers/of/kexec.c to allocate and free memory for FDT.

Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
initialize the FDT, and to free the FDT respectively.

powerpc sets the FDT address in image_loader_data field in
"struct kimage" and the memory is freed in
kimage_file_post_load_cleanup().  This cleanup function uses kfree()
to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
for allocation, the buffer needs to be freed using kvfree().

Define "fdt" field in "struct kimage_arch" for powerpc to store
the address of FDT, and free the memory in powerpc specific
arch_kimage_file_post_load_cleanup().

Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Suggested-by: Rob Herring <robh@kernel.org>
Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
---
 arch/powerpc/include/asm/kexec.h  |  2 ++
 arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
 arch/powerpc/kexec/file_load_64.c |  3 +++
 3 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 2c0be93d239a..d7d13cac4d31 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -111,6 +111,8 @@ struct kimage_arch {
 	unsigned long elf_headers_mem;
 	unsigned long elf_headers_sz;
 	void *elf_headers;
+
+	void *fdt;
 };
 
 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
index d0e459bb2f05..51d2d8eb6c1b 100644
--- a/arch/powerpc/kexec/elf_64.c
+++ b/arch/powerpc/kexec/elf_64.c
@@ -19,6 +19,7 @@
 #include <linux/kexec.h>
 #include <linux/libfdt.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/of_fdt.h>
 #include <linux/slab.h>
 #include <linux/types.h>
@@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	unsigned int fdt_size;
 	unsigned long kernel_load_addr;
 	unsigned long initrd_load_addr = 0, fdt_load_addr;
-	void *fdt;
+	void *fdt = NULL;
 	const void *slave_code;
 	struct elfhdr ehdr;
 	char *modified_cmdline = NULL;
@@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	}
 
 	fdt_size = fdt_totalsize(initial_boot_params) * 2;
-	fdt = kmalloc(fdt_size, GFP_KERNEL);
+	fdt = of_alloc_and_init_fdt(fdt_size);
 	if (!fdt) {
 		pr_err("Not enough memory for the device tree.\n");
 		ret = -ENOMEM;
 		goto out;
 	}
-	ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
-	if (ret < 0) {
-		pr_err("Error setting up the new device tree.\n");
-		ret = -EINVAL;
-		goto out;
-	}
 
 	ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
 				  initrd_len, cmdline);
@@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	ret = kexec_add_buffer(&kbuf);
 	if (ret)
 		goto out;
+
+	/* FDT will be freed in arch_kimage_file_post_load_cleanup */
+	image->arch.fdt = fdt;
+
 	fdt_load_addr = kbuf.mem;
 
 	pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
@@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
 	kfree(modified_cmdline);
 	kexec_free_elf_info(&elf_info);
 
-	/* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
-	return ret ? ERR_PTR(ret) : fdt;
+	/*
+	 * Once FDT buffer has been successfully passed to kexec_add_buffer(),
+	 * the FDT buffer address is saved in image->arch.fdt. In that case,
+	 * the memory cannot be freed here in case of any other error.
+	 */
+	if (ret && !image->arch.fdt)
+		of_free_fdt(fdt);
+
+	return ret ? ERR_PTR(ret) : NULL;
 }
 
 const struct kexec_file_ops kexec_elf64_ops = {
diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
index 3cab318aa3b9..d9d5b5569a6d 100644
--- a/arch/powerpc/kexec/file_load_64.c
+++ b/arch/powerpc/kexec/file_load_64.c
@@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
 	image->arch.elf_headers = NULL;
 	image->arch.elf_headers_sz = 0;
 
+	of_free_fdt(image->arch.fdt);
+	image->arch.fdt = NULL;
+
 	return kexec_image_post_load_cleanup_default(image);
 }
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 12/12] arm64: Enable passing IMA log to next kernel on kexec
  2021-02-04 16:41 ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: james.morse, sashal, benh, paulus, frowand.list,
	vincenzo.frascino, mark.rutland, dmitry.kasatkin, jmorris, serge,
	pasha.tatashin, allison, masahiroy, bhsharma, mbrugger, hsinyi,
	tao.li, christophe.leroy, prsriva, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC, if CONFIG_IMA
is enabled, to indicate that the IMA measurement log information is
present in the device tree for ARM64.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 05e17351e4f3..8a93573cebb6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1093,6 +1093,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "kexec file based system call"
 	select KEXEC_CORE
+	select HAVE_IMA_KEXEC if IMA
 	help
 	  This is new version of kexec system call. This system call is
 	  file based and takes file descriptors as system call argument
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 12/12] arm64: Enable passing IMA log to next kernel on kexec
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC, if CONFIG_IMA
is enabled, to indicate that the IMA measurement log information is
present in the device tree for ARM64.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 05e17351e4f3..8a93573cebb6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1093,6 +1093,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "kexec file based system call"
 	select KEXEC_CORE
+	select HAVE_IMA_KEXEC if IMA
 	help
 	  This is new version of kexec system call. This system call is
 	  file based and takes file descriptors as system call argument
-- 
2.30.0


^ permalink raw reply related	[flat|nested] 58+ messages in thread
* [PATCH v16 12/12] arm64: Enable passing IMA log to next kernel on kexec
@ 2021-02-04 16:41   ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 16:41 UTC (permalink / raw)
  To: zohar, bauerman, robh, takahiro.akashi, gregkh, will, joe,
	catalin.marinas, mpe
  Cc: mark.rutland, benh, bhsharma, tao.li, paulus, vincenzo.frascino,
	frowand.list, sashal, masahiroy, jmorris, linux-arm-kernel,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, linux-integrity, linuxppc-dev

Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC, if CONFIG_IMA
is enabled, to indicate that the IMA measurement log information is
present in the device tree for ARM64.

Co-developed-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Prakhar Srivastava <prsriva@linux.microsoft.com>
Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
---
 arch/arm64/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 05e17351e4f3..8a93573cebb6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1093,6 +1093,7 @@ config KEXEC
 config KEXEC_FILE
 	bool "kexec file based system call"
 	select KEXEC_CORE
+	select HAVE_IMA_KEXEC if IMA
 	help
 	  This is new version of kexec system call. This system call is
 	  file based and takes file descriptors as system call argument
-- 
2.30.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply related	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 10/12] arm64: Use OF alloc and free functions for FDT
  2021-02-04 16:41   ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 18:00     ` Will Deacon
  -1 siblings, 0 replies; 58+ messages in thread
From: Will Deacon @ 2021-02-04 18:00 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: zohar, bauerman, robh, takahiro.akashi, gregkh, joe,
	catalin.marinas, mpe, james.morse, sashal, benh, paulus,
	frowand.list, vincenzo.frascino, mark.rutland, dmitry.kasatkin,
	jmorris, serge, pasha.tatashin, allison, masahiroy, bhsharma,
	mbrugger, hsinyi, tao.li, christophe.leroy, prsriva, balajib,
	linux-integrity, linux-kernel, linux-arm-kernel, devicetree,
	linuxppc-dev

On Thu, Feb 04, 2021 at 08:41:33AM -0800, Lakshmi Ramasubramanian wrote:
> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> drivers/of/kexec.c to allocate and free memory for FDT.
> 
> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> initialize the FDT, and to free the FDT respectively.
> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> ---
>  arch/arm64/kernel/machine_kexec_file.c | 37 +++++++-------------------
>  1 file changed, 10 insertions(+), 27 deletions(-)

Acked-by: Will Deacon <will@kernel.org>

Will

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 10/12] arm64: Use OF alloc and free functions for FDT
@ 2021-02-04 18:00     ` Will Deacon
  0 siblings, 0 replies; 58+ messages in thread
From: Will Deacon @ 2021-02-04 18:00 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: mark.rutland, bhsharma, tao.li, zohar, paulus, vincenzo.frascino,
	frowand.list, sashal, robh, masahiroy, jmorris, takahiro.akashi,
	linux-arm-kernel, catalin.marinas, serge, devicetree,
	pasha.tatashin, prsriva, hsinyi, allison, christophe.leroy,
	mbrugger, balajib, dmitry.kasatkin, linux-kernel, james.morse,
	gregkh, joe, linux-integrity, linuxppc-dev, bauerman

On Thu, Feb 04, 2021 at 08:41:33AM -0800, Lakshmi Ramasubramanian wrote:
> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> drivers/of/kexec.c to allocate and free memory for FDT.
> 
> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> initialize the FDT, and to free the FDT respectively.
> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> ---
>  arch/arm64/kernel/machine_kexec_file.c | 37 +++++++-------------------
>  1 file changed, 10 insertions(+), 27 deletions(-)

Acked-by: Will Deacon <will@kernel.org>

Will

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 10/12] arm64: Use OF alloc and free functions for FDT
@ 2021-02-04 18:00     ` Will Deacon
  0 siblings, 0 replies; 58+ messages in thread
From: Will Deacon @ 2021-02-04 18:00 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: mark.rutland, benh, bhsharma, tao.li, zohar, paulus,
	vincenzo.frascino, frowand.list, sashal, robh, mpe, masahiroy,
	jmorris, takahiro.akashi, linux-arm-kernel, catalin.marinas,
	serge, devicetree, pasha.tatashin, prsriva, hsinyi, allison,
	christophe.leroy, mbrugger, balajib, dmitry.kasatkin,
	linux-kernel, james.morse, gregkh, joe, linux-integrity,
	linuxppc-dev, bauerman

On Thu, Feb 04, 2021 at 08:41:33AM -0800, Lakshmi Ramasubramanian wrote:
> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> drivers/of/kexec.c to allocate and free memory for FDT.
> 
> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> initialize the FDT, and to free the FDT respectively.
> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> ---
>  arch/arm64/kernel/machine_kexec_file.c | 37 +++++++-------------------
>  1 file changed, 10 insertions(+), 27 deletions(-)

Acked-by: Will Deacon <will@kernel.org>

Will

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
  2021-02-04 16:41   ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 19:26     ` Rob Herring
  -1 siblings, 0 replies; 58+ messages in thread
From: Rob Herring @ 2021-02-04 19:26 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: Mimi Zohar, Thiago Jung Bauermann, AKASHI, Takahiro,
	Greg Kroah-Hartman, Will Deacon, Joe Perches, Catalin Marinas,
	Michael Ellerman, James Morse, Sasha Levin,
	Benjamin Herrenschmidt, Paul Mackerras, Frank Rowand,
	vincenzo.frascino, Mark Rutland, dmitry.kasatkin, James Morris,
	Serge E. Hallyn, Pavel Tatashin, Allison Randal, Masahiro Yamada,
	Bhupesh Sharma, Matthias Brugger, Hsin-Yi Wang, tao.li,
	Christophe Leroy, Prakhar Srivastava, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
>
> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> drivers/of/kexec.c to allocate and free memory for FDT.
>
> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> initialize the FDT, and to free the FDT respectively.
>
> powerpc sets the FDT address in image_loader_data field in
> "struct kimage" and the memory is freed in
> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
> for allocation, the buffer needs to be freed using kvfree().

You could just change the kexec core to call kvfree() instead.

> Define "fdt" field in "struct kimage_arch" for powerpc to store
> the address of FDT, and free the memory in powerpc specific
> arch_kimage_file_post_load_cleanup().

However, given all the other buffers have an explicit field in kimage
or kimage_arch, changing powerpc is to match arm64 is better IMO.

> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> ---
>  arch/powerpc/include/asm/kexec.h  |  2 ++
>  arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>  arch/powerpc/kexec/file_load_64.c |  3 +++
>  3 files changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
> index 2c0be93d239a..d7d13cac4d31 100644
> --- a/arch/powerpc/include/asm/kexec.h
> +++ b/arch/powerpc/include/asm/kexec.h
> @@ -111,6 +111,8 @@ struct kimage_arch {
>         unsigned long elf_headers_mem;
>         unsigned long elf_headers_sz;
>         void *elf_headers;
> +
> +       void *fdt;
>  };
>
>  char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
> index d0e459bb2f05..51d2d8eb6c1b 100644
> --- a/arch/powerpc/kexec/elf_64.c
> +++ b/arch/powerpc/kexec/elf_64.c
> @@ -19,6 +19,7 @@
>  #include <linux/kexec.h>
>  #include <linux/libfdt.h>
>  #include <linux/module.h>
> +#include <linux/of.h>
>  #include <linux/of_fdt.h>
>  #include <linux/slab.h>
>  #include <linux/types.h>
> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         unsigned int fdt_size;
>         unsigned long kernel_load_addr;
>         unsigned long initrd_load_addr = 0, fdt_load_addr;
> -       void *fdt;
> +       void *fdt = NULL;
>         const void *slave_code;
>         struct elfhdr ehdr;
>         char *modified_cmdline = NULL;
> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         }
>
>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
> +       fdt = of_alloc_and_init_fdt(fdt_size);
>         if (!fdt) {
>                 pr_err("Not enough memory for the device tree.\n");
>                 ret = -ENOMEM;
>                 goto out;
>         }
> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
> -       if (ret < 0) {
> -               pr_err("Error setting up the new device tree.\n");
> -               ret = -EINVAL;
> -               goto out;
> -       }
>
>         ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,

The first thing this function does is call setup_new_fdt() which first
calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
PPC code split. It looks like there's a 32-bit and 64-bit split, but
32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
setup_new_fdt_ppc64()). The arm64 version is calling
of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.

So we can just make of_alloc_and_init_fdt() also call
of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
the alloc and copy). I don't think the architecture needs to pick the
size either. It's doubtful that either one is that sensitive to the
amount of extra space.

>                                   initrd_len, cmdline);
> @@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         ret = kexec_add_buffer(&kbuf);
>         if (ret)
>                 goto out;
> +
> +       /* FDT will be freed in arch_kimage_file_post_load_cleanup */
> +       image->arch.fdt = fdt;
> +
>         fdt_load_addr = kbuf.mem;
>
>         pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
> @@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         kfree(modified_cmdline);
>         kexec_free_elf_info(&elf_info);
>
> -       /* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
> -       return ret ? ERR_PTR(ret) : fdt;
> +       /*
> +        * Once FDT buffer has been successfully passed to kexec_add_buffer(),
> +        * the FDT buffer address is saved in image->arch.fdt. In that case,
> +        * the memory cannot be freed here in case of any other error.
> +        */
> +       if (ret && !image->arch.fdt)
> +               of_free_fdt(fdt);

Just call kvfree() directly.

> +
> +       return ret ? ERR_PTR(ret) : NULL;
>  }
>
>  const struct kexec_file_ops kexec_elf64_ops = {
> diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
> index 3cab318aa3b9..d9d5b5569a6d 100644
> --- a/arch/powerpc/kexec/file_load_64.c
> +++ b/arch/powerpc/kexec/file_load_64.c
> @@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
>         image->arch.elf_headers = NULL;
>         image->arch.elf_headers_sz = 0;
>
> +       of_free_fdt(image->arch.fdt);
> +       image->arch.fdt = NULL;
> +
>         return kexec_image_post_load_cleanup_default(image);
>  }
> --
> 2.30.0
>

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 19:26     ` Rob Herring
  0 siblings, 0 replies; 58+ messages in thread
From: Rob Herring @ 2021-02-04 19:26 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: Mark Rutland, Bhupesh Sharma, tao.li, Mimi Zohar, Paul Mackerras,
	vincenzo.frascino, Frank Rowand, Sasha Levin, Masahiro Yamada,
	James Morris, AKASHI, Takahiro, linux-arm-kernel,
	Catalin Marinas, Serge E. Hallyn, devicetree, Pavel Tatashin,
	Will Deacon, Prakhar Srivastava, Hsin-Yi Wang, Allison Randal,
	Christophe Leroy, Matthias Brugger, balajib, dmitry.kasatkin,
	linux-kernel, James Morse, Greg Kroah-Hartman, Joe Perches,
	linux-integrity, linuxppc-dev, Thiago Jung Bauermann

On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
>
> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> drivers/of/kexec.c to allocate and free memory for FDT.
>
> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> initialize the FDT, and to free the FDT respectively.
>
> powerpc sets the FDT address in image_loader_data field in
> "struct kimage" and the memory is freed in
> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
> for allocation, the buffer needs to be freed using kvfree().

You could just change the kexec core to call kvfree() instead.

> Define "fdt" field in "struct kimage_arch" for powerpc to store
> the address of FDT, and free the memory in powerpc specific
> arch_kimage_file_post_load_cleanup().

However, given all the other buffers have an explicit field in kimage
or kimage_arch, changing powerpc is to match arm64 is better IMO.

> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> ---
>  arch/powerpc/include/asm/kexec.h  |  2 ++
>  arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>  arch/powerpc/kexec/file_load_64.c |  3 +++
>  3 files changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
> index 2c0be93d239a..d7d13cac4d31 100644
> --- a/arch/powerpc/include/asm/kexec.h
> +++ b/arch/powerpc/include/asm/kexec.h
> @@ -111,6 +111,8 @@ struct kimage_arch {
>         unsigned long elf_headers_mem;
>         unsigned long elf_headers_sz;
>         void *elf_headers;
> +
> +       void *fdt;
>  };
>
>  char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
> index d0e459bb2f05..51d2d8eb6c1b 100644
> --- a/arch/powerpc/kexec/elf_64.c
> +++ b/arch/powerpc/kexec/elf_64.c
> @@ -19,6 +19,7 @@
>  #include <linux/kexec.h>
>  #include <linux/libfdt.h>
>  #include <linux/module.h>
> +#include <linux/of.h>
>  #include <linux/of_fdt.h>
>  #include <linux/slab.h>
>  #include <linux/types.h>
> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         unsigned int fdt_size;
>         unsigned long kernel_load_addr;
>         unsigned long initrd_load_addr = 0, fdt_load_addr;
> -       void *fdt;
> +       void *fdt = NULL;
>         const void *slave_code;
>         struct elfhdr ehdr;
>         char *modified_cmdline = NULL;
> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         }
>
>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
> +       fdt = of_alloc_and_init_fdt(fdt_size);
>         if (!fdt) {
>                 pr_err("Not enough memory for the device tree.\n");
>                 ret = -ENOMEM;
>                 goto out;
>         }
> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
> -       if (ret < 0) {
> -               pr_err("Error setting up the new device tree.\n");
> -               ret = -EINVAL;
> -               goto out;
> -       }
>
>         ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,

The first thing this function does is call setup_new_fdt() which first
calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
PPC code split. It looks like there's a 32-bit and 64-bit split, but
32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
setup_new_fdt_ppc64()). The arm64 version is calling
of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.

So we can just make of_alloc_and_init_fdt() also call
of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
the alloc and copy). I don't think the architecture needs to pick the
size either. It's doubtful that either one is that sensitive to the
amount of extra space.

>                                   initrd_len, cmdline);
> @@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         ret = kexec_add_buffer(&kbuf);
>         if (ret)
>                 goto out;
> +
> +       /* FDT will be freed in arch_kimage_file_post_load_cleanup */
> +       image->arch.fdt = fdt;
> +
>         fdt_load_addr = kbuf.mem;
>
>         pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
> @@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         kfree(modified_cmdline);
>         kexec_free_elf_info(&elf_info);
>
> -       /* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
> -       return ret ? ERR_PTR(ret) : fdt;
> +       /*
> +        * Once FDT buffer has been successfully passed to kexec_add_buffer(),
> +        * the FDT buffer address is saved in image->arch.fdt. In that case,
> +        * the memory cannot be freed here in case of any other error.
> +        */
> +       if (ret && !image->arch.fdt)
> +               of_free_fdt(fdt);

Just call kvfree() directly.

> +
> +       return ret ? ERR_PTR(ret) : NULL;
>  }
>
>  const struct kexec_file_ops kexec_elf64_ops = {
> diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
> index 3cab318aa3b9..d9d5b5569a6d 100644
> --- a/arch/powerpc/kexec/file_load_64.c
> +++ b/arch/powerpc/kexec/file_load_64.c
> @@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
>         image->arch.elf_headers = NULL;
>         image->arch.elf_headers_sz = 0;
>
> +       of_free_fdt(image->arch.fdt);
> +       image->arch.fdt = NULL;
> +
>         return kexec_image_post_load_cleanup_default(image);
>  }
> --
> 2.30.0
>

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 19:26     ` Rob Herring
  0 siblings, 0 replies; 58+ messages in thread
From: Rob Herring @ 2021-02-04 19:26 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: Mark Rutland, Benjamin Herrenschmidt, Bhupesh Sharma, tao.li,
	Mimi Zohar, Paul Mackerras, vincenzo.frascino, Frank Rowand,
	Sasha Levin, Michael Ellerman, Masahiro Yamada, James Morris,
	AKASHI, Takahiro, linux-arm-kernel, Catalin Marinas,
	Serge E. Hallyn, devicetree, Pavel Tatashin, Will Deacon,
	Prakhar Srivastava, Hsin-Yi Wang, Allison Randal,
	Christophe Leroy, Matthias Brugger, balajib, dmitry.kasatkin,
	linux-kernel, James Morse, Greg Kroah-Hartman, Joe Perches,
	linux-integrity, linuxppc-dev, Thiago Jung Bauermann

On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
>
> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> drivers/of/kexec.c to allocate and free memory for FDT.
>
> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> initialize the FDT, and to free the FDT respectively.
>
> powerpc sets the FDT address in image_loader_data field in
> "struct kimage" and the memory is freed in
> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
> for allocation, the buffer needs to be freed using kvfree().

You could just change the kexec core to call kvfree() instead.

> Define "fdt" field in "struct kimage_arch" for powerpc to store
> the address of FDT, and free the memory in powerpc specific
> arch_kimage_file_post_load_cleanup().

However, given all the other buffers have an explicit field in kimage
or kimage_arch, changing powerpc is to match arm64 is better IMO.

> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> Suggested-by: Rob Herring <robh@kernel.org>
> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> ---
>  arch/powerpc/include/asm/kexec.h  |  2 ++
>  arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>  arch/powerpc/kexec/file_load_64.c |  3 +++
>  3 files changed, 21 insertions(+), 10 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
> index 2c0be93d239a..d7d13cac4d31 100644
> --- a/arch/powerpc/include/asm/kexec.h
> +++ b/arch/powerpc/include/asm/kexec.h
> @@ -111,6 +111,8 @@ struct kimage_arch {
>         unsigned long elf_headers_mem;
>         unsigned long elf_headers_sz;
>         void *elf_headers;
> +
> +       void *fdt;
>  };
>
>  char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
> index d0e459bb2f05..51d2d8eb6c1b 100644
> --- a/arch/powerpc/kexec/elf_64.c
> +++ b/arch/powerpc/kexec/elf_64.c
> @@ -19,6 +19,7 @@
>  #include <linux/kexec.h>
>  #include <linux/libfdt.h>
>  #include <linux/module.h>
> +#include <linux/of.h>
>  #include <linux/of_fdt.h>
>  #include <linux/slab.h>
>  #include <linux/types.h>
> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         unsigned int fdt_size;
>         unsigned long kernel_load_addr;
>         unsigned long initrd_load_addr = 0, fdt_load_addr;
> -       void *fdt;
> +       void *fdt = NULL;
>         const void *slave_code;
>         struct elfhdr ehdr;
>         char *modified_cmdline = NULL;
> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         }
>
>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
> +       fdt = of_alloc_and_init_fdt(fdt_size);
>         if (!fdt) {
>                 pr_err("Not enough memory for the device tree.\n");
>                 ret = -ENOMEM;
>                 goto out;
>         }
> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
> -       if (ret < 0) {
> -               pr_err("Error setting up the new device tree.\n");
> -               ret = -EINVAL;
> -               goto out;
> -       }
>
>         ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,

The first thing this function does is call setup_new_fdt() which first
calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
PPC code split. It looks like there's a 32-bit and 64-bit split, but
32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
setup_new_fdt_ppc64()). The arm64 version is calling
of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.

So we can just make of_alloc_and_init_fdt() also call
of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
the alloc and copy). I don't think the architecture needs to pick the
size either. It's doubtful that either one is that sensitive to the
amount of extra space.

>                                   initrd_len, cmdline);
> @@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         ret = kexec_add_buffer(&kbuf);
>         if (ret)
>                 goto out;
> +
> +       /* FDT will be freed in arch_kimage_file_post_load_cleanup */
> +       image->arch.fdt = fdt;
> +
>         fdt_load_addr = kbuf.mem;
>
>         pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
> @@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>         kfree(modified_cmdline);
>         kexec_free_elf_info(&elf_info);
>
> -       /* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
> -       return ret ? ERR_PTR(ret) : fdt;
> +       /*
> +        * Once FDT buffer has been successfully passed to kexec_add_buffer(),
> +        * the FDT buffer address is saved in image->arch.fdt. In that case,
> +        * the memory cannot be freed here in case of any other error.
> +        */
> +       if (ret && !image->arch.fdt)
> +               of_free_fdt(fdt);

Just call kvfree() directly.

> +
> +       return ret ? ERR_PTR(ret) : NULL;
>  }
>
>  const struct kexec_file_ops kexec_elf64_ops = {
> diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
> index 3cab318aa3b9..d9d5b5569a6d 100644
> --- a/arch/powerpc/kexec/file_load_64.c
> +++ b/arch/powerpc/kexec/file_load_64.c
> @@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
>         image->arch.elf_headers = NULL;
>         image->arch.elf_headers_sz = 0;
>
> +       of_free_fdt(image->arch.fdt);
> +       image->arch.fdt = NULL;
> +
>         return kexec_image_post_load_cleanup_default(image);
>  }
> --
> 2.30.0
>

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
  2021-02-04 19:26     ` Rob Herring
  (?)
@ 2021-02-04 23:23       ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 23:23 UTC (permalink / raw)
  To: Rob Herring
  Cc: Mimi Zohar, Thiago Jung Bauermann, AKASHI, Takahiro,
	Greg Kroah-Hartman, Will Deacon, Joe Perches, Catalin Marinas,
	Michael Ellerman, James Morse, Sasha Levin,
	Benjamin Herrenschmidt, Paul Mackerras, Frank Rowand,
	vincenzo.frascino, Mark Rutland, dmitry.kasatkin, James Morris,
	Serge E. Hallyn, Pavel Tatashin, Allison Randal, Masahiro Yamada,
	Bhupesh Sharma, Matthias Brugger, Hsin-Yi Wang, tao.li,
	Christophe Leroy, Prakhar Srivastava, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

On 2/4/21 11:26 AM, Rob Herring wrote:
> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
>>
>> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
>> drivers/of/kexec.c to allocate and free memory for FDT.
>>
>> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
>> initialize the FDT, and to free the FDT respectively.
>>
>> powerpc sets the FDT address in image_loader_data field in
>> "struct kimage" and the memory is freed in
>> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
>> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
>> for allocation, the buffer needs to be freed using kvfree().
> 
> You could just change the kexec core to call kvfree() instead.

> 
>> Define "fdt" field in "struct kimage_arch" for powerpc to store
>> the address of FDT, and free the memory in powerpc specific
>> arch_kimage_file_post_load_cleanup().
> 
> However, given all the other buffers have an explicit field in kimage
> or kimage_arch, changing powerpc is to match arm64 is better IMO.

Just to be clear:
I'll leave this as is - free FDT buffer in powerpc's 
arch_kimage_file_post_load_cleanup() to match arm64 behavior.

Will not change "kexec core" to call kvfree() - doing that change would 
require changing all architectures to use kvmalloc() for 
image_loader_data allocation.

> 
>> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>> Suggested-by: Rob Herring <robh@kernel.org>
>> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>> ---
>>   arch/powerpc/include/asm/kexec.h  |  2 ++
>>   arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>>   arch/powerpc/kexec/file_load_64.c |  3 +++
>>   3 files changed, 21 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
>> index 2c0be93d239a..d7d13cac4d31 100644
>> --- a/arch/powerpc/include/asm/kexec.h
>> +++ b/arch/powerpc/include/asm/kexec.h
>> @@ -111,6 +111,8 @@ struct kimage_arch {
>>          unsigned long elf_headers_mem;
>>          unsigned long elf_headers_sz;
>>          void *elf_headers;
>> +
>> +       void *fdt;
>>   };
>>
>>   char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>> index d0e459bb2f05..51d2d8eb6c1b 100644
>> --- a/arch/powerpc/kexec/elf_64.c
>> +++ b/arch/powerpc/kexec/elf_64.c
>> @@ -19,6 +19,7 @@
>>   #include <linux/kexec.h>
>>   #include <linux/libfdt.h>
>>   #include <linux/module.h>
>> +#include <linux/of.h>
>>   #include <linux/of_fdt.h>
>>   #include <linux/slab.h>
>>   #include <linux/types.h>
>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          unsigned int fdt_size;
>>          unsigned long kernel_load_addr;
>>          unsigned long initrd_load_addr = 0, fdt_load_addr;
>> -       void *fdt;
>> +       void *fdt = NULL;
>>          const void *slave_code;
>>          struct elfhdr ehdr;
>>          char *modified_cmdline = NULL;
>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          }
>>
>>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>          if (!fdt) {
>>                  pr_err("Not enough memory for the device tree.\n");
>>                  ret = -ENOMEM;
>>                  goto out;
>>          }
>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>> -       if (ret < 0) {
>> -               pr_err("Error setting up the new device tree.\n");
>> -               ret = -EINVAL;
>> -               goto out;
>> -       }
>>
>>          ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
> 
> The first thing this function does is call setup_new_fdt() which first
> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> PPC code split. It looks like there's a 32-bit and 64-bit split, but
> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> setup_new_fdt_ppc64()). The arm64 version is calling
> of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
> 
> So we can just make of_alloc_and_init_fdt() also call
> of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
> the alloc and copy). 
ok - will move fdt allocation into of_kexec_setup_new_fdt().

I don't think the architecture needs to pick the
> size either. It's doubtful that either one is that sensitive to the
> amount of extra space.
I am not clear about the above comment -
are you saying the architectures don't need to pass FDT size to the 
alloc function?

arm64 is adding command line string length and some extra space to the 
size computed from initial_boot_params for FDT Size:

	buf_size = fdt_totalsize(initial_boot_params)
			+ cmdline_len + DTB_EXTRA_SPACE;

powerpc is just using twice the size computed from initial_boot_params

	fdt_size = fdt_totalsize(initial_boot_params) * 2;

I think it would be safe to let arm64 and powerpc pass the required FDT 
size, along with the other params to of_kexec_setup_new_fdt() - and in 
this function we allocate FDT and set it up.

And, for powerpc leave the remaining code in setup_new_fdt_ppc64().

Would that be ok?

> 
>>                                    initrd_len, cmdline);
>> @@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          ret = kexec_add_buffer(&kbuf);
>>          if (ret)
>>                  goto out;
>> +
>> +       /* FDT will be freed in arch_kimage_file_post_load_cleanup */
>> +       image->arch.fdt = fdt;
>> +
>>          fdt_load_addr = kbuf.mem;
>>
>>          pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
>> @@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          kfree(modified_cmdline);
>>          kexec_free_elf_info(&elf_info);
>>
>> -       /* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
>> -       return ret ? ERR_PTR(ret) : fdt;
>> +       /*
>> +        * Once FDT buffer has been successfully passed to kexec_add_buffer(),
>> +        * the FDT buffer address is saved in image->arch.fdt. In that case,
>> +        * the memory cannot be freed here in case of any other error.
>> +        */
>> +       if (ret && !image->arch.fdt)
>> +               of_free_fdt(fdt);
> 
> Just call kvfree() directly.
Sure - will do.

  -lakshmi

> 
>> +
>> +       return ret ? ERR_PTR(ret) : NULL;
>>   }
>>
>>   const struct kexec_file_ops kexec_elf64_ops = {
>> diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
>> index 3cab318aa3b9..d9d5b5569a6d 100644
>> --- a/arch/powerpc/kexec/file_load_64.c
>> +++ b/arch/powerpc/kexec/file_load_64.c
>> @@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
>>          image->arch.elf_headers = NULL;
>>          image->arch.elf_headers_sz = 0;
>>
>> +       of_free_fdt(image->arch.fdt);
>> +       image->arch.fdt = NULL;
>> +
>>          return kexec_image_post_load_cleanup_default(image);
>>   }
>> --
>> 2.30.0
>>


^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 23:23       ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 23:23 UTC (permalink / raw)
  To: Rob Herring
  Cc: Mark Rutland, Bhupesh Sharma, tao.li, Mimi Zohar, Paul Mackerras,
	vincenzo.frascino, Frank Rowand, Sasha Levin, Masahiro Yamada,
	James Morris, AKASHI, Takahiro, linux-arm-kernel,
	Catalin Marinas, Serge E. Hallyn, devicetree, Pavel Tatashin,
	Will Deacon, Prakhar Srivastava, Hsin-Yi Wang, Allison Randal,
	Christophe Leroy, Matthias Brugger, balajib, dmitry.kasatkin,
	linux-kernel, James Morse, Greg Kroah-Hartman, Joe Perches,
	linux-integrity, linuxppc-dev, Thiago Jung Bauermann

On 2/4/21 11:26 AM, Rob Herring wrote:
> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
>>
>> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
>> drivers/of/kexec.c to allocate and free memory for FDT.
>>
>> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
>> initialize the FDT, and to free the FDT respectively.
>>
>> powerpc sets the FDT address in image_loader_data field in
>> "struct kimage" and the memory is freed in
>> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
>> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
>> for allocation, the buffer needs to be freed using kvfree().
> 
> You could just change the kexec core to call kvfree() instead.

> 
>> Define "fdt" field in "struct kimage_arch" for powerpc to store
>> the address of FDT, and free the memory in powerpc specific
>> arch_kimage_file_post_load_cleanup().
> 
> However, given all the other buffers have an explicit field in kimage
> or kimage_arch, changing powerpc is to match arm64 is better IMO.

Just to be clear:
I'll leave this as is - free FDT buffer in powerpc's 
arch_kimage_file_post_load_cleanup() to match arm64 behavior.

Will not change "kexec core" to call kvfree() - doing that change would 
require changing all architectures to use kvmalloc() for 
image_loader_data allocation.

> 
>> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>> Suggested-by: Rob Herring <robh@kernel.org>
>> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>> ---
>>   arch/powerpc/include/asm/kexec.h  |  2 ++
>>   arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>>   arch/powerpc/kexec/file_load_64.c |  3 +++
>>   3 files changed, 21 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
>> index 2c0be93d239a..d7d13cac4d31 100644
>> --- a/arch/powerpc/include/asm/kexec.h
>> +++ b/arch/powerpc/include/asm/kexec.h
>> @@ -111,6 +111,8 @@ struct kimage_arch {
>>          unsigned long elf_headers_mem;
>>          unsigned long elf_headers_sz;
>>          void *elf_headers;
>> +
>> +       void *fdt;
>>   };
>>
>>   char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>> index d0e459bb2f05..51d2d8eb6c1b 100644
>> --- a/arch/powerpc/kexec/elf_64.c
>> +++ b/arch/powerpc/kexec/elf_64.c
>> @@ -19,6 +19,7 @@
>>   #include <linux/kexec.h>
>>   #include <linux/libfdt.h>
>>   #include <linux/module.h>
>> +#include <linux/of.h>
>>   #include <linux/of_fdt.h>
>>   #include <linux/slab.h>
>>   #include <linux/types.h>
>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          unsigned int fdt_size;
>>          unsigned long kernel_load_addr;
>>          unsigned long initrd_load_addr = 0, fdt_load_addr;
>> -       void *fdt;
>> +       void *fdt = NULL;
>>          const void *slave_code;
>>          struct elfhdr ehdr;
>>          char *modified_cmdline = NULL;
>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          }
>>
>>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>          if (!fdt) {
>>                  pr_err("Not enough memory for the device tree.\n");
>>                  ret = -ENOMEM;
>>                  goto out;
>>          }
>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>> -       if (ret < 0) {
>> -               pr_err("Error setting up the new device tree.\n");
>> -               ret = -EINVAL;
>> -               goto out;
>> -       }
>>
>>          ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
> 
> The first thing this function does is call setup_new_fdt() which first
> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> PPC code split. It looks like there's a 32-bit and 64-bit split, but
> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> setup_new_fdt_ppc64()). The arm64 version is calling
> of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
> 
> So we can just make of_alloc_and_init_fdt() also call
> of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
> the alloc and copy). 
ok - will move fdt allocation into of_kexec_setup_new_fdt().

I don't think the architecture needs to pick the
> size either. It's doubtful that either one is that sensitive to the
> amount of extra space.
I am not clear about the above comment -
are you saying the architectures don't need to pass FDT size to the 
alloc function?

arm64 is adding command line string length and some extra space to the 
size computed from initial_boot_params for FDT Size:

	buf_size = fdt_totalsize(initial_boot_params)
			+ cmdline_len + DTB_EXTRA_SPACE;

powerpc is just using twice the size computed from initial_boot_params

	fdt_size = fdt_totalsize(initial_boot_params) * 2;

I think it would be safe to let arm64 and powerpc pass the required FDT 
size, along with the other params to of_kexec_setup_new_fdt() - and in 
this function we allocate FDT and set it up.

And, for powerpc leave the remaining code in setup_new_fdt_ppc64().

Would that be ok?

> 
>>                                    initrd_len, cmdline);
>> @@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          ret = kexec_add_buffer(&kbuf);
>>          if (ret)
>>                  goto out;
>> +
>> +       /* FDT will be freed in arch_kimage_file_post_load_cleanup */
>> +       image->arch.fdt = fdt;
>> +
>>          fdt_load_addr = kbuf.mem;
>>
>>          pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
>> @@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          kfree(modified_cmdline);
>>          kexec_free_elf_info(&elf_info);
>>
>> -       /* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
>> -       return ret ? ERR_PTR(ret) : fdt;
>> +       /*
>> +        * Once FDT buffer has been successfully passed to kexec_add_buffer(),
>> +        * the FDT buffer address is saved in image->arch.fdt. In that case,
>> +        * the memory cannot be freed here in case of any other error.
>> +        */
>> +       if (ret && !image->arch.fdt)
>> +               of_free_fdt(fdt);
> 
> Just call kvfree() directly.
Sure - will do.

  -lakshmi

> 
>> +
>> +       return ret ? ERR_PTR(ret) : NULL;
>>   }
>>
>>   const struct kexec_file_ops kexec_elf64_ops = {
>> diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
>> index 3cab318aa3b9..d9d5b5569a6d 100644
>> --- a/arch/powerpc/kexec/file_load_64.c
>> +++ b/arch/powerpc/kexec/file_load_64.c
>> @@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
>>          image->arch.elf_headers = NULL;
>>          image->arch.elf_headers_sz = 0;
>>
>> +       of_free_fdt(image->arch.fdt);
>> +       image->arch.fdt = NULL;
>> +
>>          return kexec_image_post_load_cleanup_default(image);
>>   }
>> --
>> 2.30.0
>>


^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 23:23       ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 23:23 UTC (permalink / raw)
  To: Rob Herring
  Cc: Mark Rutland, Benjamin Herrenschmidt, Bhupesh Sharma, tao.li,
	Mimi Zohar, Paul Mackerras, vincenzo.frascino, Frank Rowand,
	Sasha Levin, Michael Ellerman, Masahiro Yamada, James Morris,
	AKASHI, Takahiro, linux-arm-kernel, Catalin Marinas,
	Serge E. Hallyn, devicetree, Pavel Tatashin, Will Deacon,
	Prakhar Srivastava, Hsin-Yi Wang, Allison Randal,
	Christophe Leroy, Matthias Brugger, balajib, dmitry.kasatkin,
	linux-kernel, James Morse, Greg Kroah-Hartman, Joe Perches,
	linux-integrity, linuxppc-dev, Thiago Jung Bauermann

On 2/4/21 11:26 AM, Rob Herring wrote:
> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
>>
>> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
>> drivers/of/kexec.c to allocate and free memory for FDT.
>>
>> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
>> initialize the FDT, and to free the FDT respectively.
>>
>> powerpc sets the FDT address in image_loader_data field in
>> "struct kimage" and the memory is freed in
>> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
>> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
>> for allocation, the buffer needs to be freed using kvfree().
> 
> You could just change the kexec core to call kvfree() instead.

> 
>> Define "fdt" field in "struct kimage_arch" for powerpc to store
>> the address of FDT, and free the memory in powerpc specific
>> arch_kimage_file_post_load_cleanup().
> 
> However, given all the other buffers have an explicit field in kimage
> or kimage_arch, changing powerpc is to match arm64 is better IMO.

Just to be clear:
I'll leave this as is - free FDT buffer in powerpc's 
arch_kimage_file_post_load_cleanup() to match arm64 behavior.

Will not change "kexec core" to call kvfree() - doing that change would 
require changing all architectures to use kvmalloc() for 
image_loader_data allocation.

> 
>> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>> Suggested-by: Rob Herring <robh@kernel.org>
>> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>> ---
>>   arch/powerpc/include/asm/kexec.h  |  2 ++
>>   arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>>   arch/powerpc/kexec/file_load_64.c |  3 +++
>>   3 files changed, 21 insertions(+), 10 deletions(-)
>>
>> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
>> index 2c0be93d239a..d7d13cac4d31 100644
>> --- a/arch/powerpc/include/asm/kexec.h
>> +++ b/arch/powerpc/include/asm/kexec.h
>> @@ -111,6 +111,8 @@ struct kimage_arch {
>>          unsigned long elf_headers_mem;
>>          unsigned long elf_headers_sz;
>>          void *elf_headers;
>> +
>> +       void *fdt;
>>   };
>>
>>   char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>> index d0e459bb2f05..51d2d8eb6c1b 100644
>> --- a/arch/powerpc/kexec/elf_64.c
>> +++ b/arch/powerpc/kexec/elf_64.c
>> @@ -19,6 +19,7 @@
>>   #include <linux/kexec.h>
>>   #include <linux/libfdt.h>
>>   #include <linux/module.h>
>> +#include <linux/of.h>
>>   #include <linux/of_fdt.h>
>>   #include <linux/slab.h>
>>   #include <linux/types.h>
>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          unsigned int fdt_size;
>>          unsigned long kernel_load_addr;
>>          unsigned long initrd_load_addr = 0, fdt_load_addr;
>> -       void *fdt;
>> +       void *fdt = NULL;
>>          const void *slave_code;
>>          struct elfhdr ehdr;
>>          char *modified_cmdline = NULL;
>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          }
>>
>>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>          if (!fdt) {
>>                  pr_err("Not enough memory for the device tree.\n");
>>                  ret = -ENOMEM;
>>                  goto out;
>>          }
>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>> -       if (ret < 0) {
>> -               pr_err("Error setting up the new device tree.\n");
>> -               ret = -EINVAL;
>> -               goto out;
>> -       }
>>
>>          ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
> 
> The first thing this function does is call setup_new_fdt() which first
> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> PPC code split. It looks like there's a 32-bit and 64-bit split, but
> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> setup_new_fdt_ppc64()). The arm64 version is calling
> of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
> 
> So we can just make of_alloc_and_init_fdt() also call
> of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
> the alloc and copy). 
ok - will move fdt allocation into of_kexec_setup_new_fdt().

I don't think the architecture needs to pick the
> size either. It's doubtful that either one is that sensitive to the
> amount of extra space.
I am not clear about the above comment -
are you saying the architectures don't need to pass FDT size to the 
alloc function?

arm64 is adding command line string length and some extra space to the 
size computed from initial_boot_params for FDT Size:

	buf_size = fdt_totalsize(initial_boot_params)
			+ cmdline_len + DTB_EXTRA_SPACE;

powerpc is just using twice the size computed from initial_boot_params

	fdt_size = fdt_totalsize(initial_boot_params) * 2;

I think it would be safe to let arm64 and powerpc pass the required FDT 
size, along with the other params to of_kexec_setup_new_fdt() - and in 
this function we allocate FDT and set it up.

And, for powerpc leave the remaining code in setup_new_fdt_ppc64().

Would that be ok?

> 
>>                                    initrd_len, cmdline);
>> @@ -131,6 +126,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          ret = kexec_add_buffer(&kbuf);
>>          if (ret)
>>                  goto out;
>> +
>> +       /* FDT will be freed in arch_kimage_file_post_load_cleanup */
>> +       image->arch.fdt = fdt;
>> +
>>          fdt_load_addr = kbuf.mem;
>>
>>          pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr);
>> @@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>          kfree(modified_cmdline);
>>          kexec_free_elf_info(&elf_info);
>>
>> -       /* Make kimage_file_post_load_cleanup free the fdt buffer for us. */
>> -       return ret ? ERR_PTR(ret) : fdt;
>> +       /*
>> +        * Once FDT buffer has been successfully passed to kexec_add_buffer(),
>> +        * the FDT buffer address is saved in image->arch.fdt. In that case,
>> +        * the memory cannot be freed here in case of any other error.
>> +        */
>> +       if (ret && !image->arch.fdt)
>> +               of_free_fdt(fdt);
> 
> Just call kvfree() directly.
Sure - will do.

  -lakshmi

> 
>> +
>> +       return ret ? ERR_PTR(ret) : NULL;
>>   }
>>
>>   const struct kexec_file_ops kexec_elf64_ops = {
>> diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c
>> index 3cab318aa3b9..d9d5b5569a6d 100644
>> --- a/arch/powerpc/kexec/file_load_64.c
>> +++ b/arch/powerpc/kexec/file_load_64.c
>> @@ -1113,5 +1113,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image)
>>          image->arch.elf_headers = NULL;
>>          image->arch.elf_headers_sz = 0;
>>
>> +       of_free_fdt(image->arch.fdt);
>> +       image->arch.fdt = NULL;
>> +
>>          return kexec_image_post_load_cleanup_default(image);
>>   }
>> --
>> 2.30.0
>>


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
  2021-02-04 23:23       ` Lakshmi Ramasubramanian
  (?)
@ 2021-02-04 23:36         ` Rob Herring
  -1 siblings, 0 replies; 58+ messages in thread
From: Rob Herring @ 2021-02-04 23:36 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: Mimi Zohar, Thiago Jung Bauermann, AKASHI, Takahiro,
	Greg Kroah-Hartman, Will Deacon, Joe Perches, Catalin Marinas,
	Michael Ellerman, James Morse, Sasha Levin,
	Benjamin Herrenschmidt, Paul Mackerras, Frank Rowand,
	vincenzo.frascino, Mark Rutland, dmitry.kasatkin, James Morris,
	Serge E. Hallyn, Pavel Tatashin, Allison Randal, Masahiro Yamada,
	Bhupesh Sharma, Matthias Brugger, Hsin-Yi Wang, tao.li,
	Christophe Leroy, Prakhar Srivastava, balajib, linux-integrity,
	linux-kernel, linux-arm-kernel, devicetree, linuxppc-dev

On Thu, Feb 4, 2021 at 5:23 PM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
>
> On 2/4/21 11:26 AM, Rob Herring wrote:
> > On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> > <nramas@linux.microsoft.com> wrote:
> >>
> >> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> >> drivers/of/kexec.c to allocate and free memory for FDT.
> >>
> >> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> >> initialize the FDT, and to free the FDT respectively.
> >>
> >> powerpc sets the FDT address in image_loader_data field in
> >> "struct kimage" and the memory is freed in
> >> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
> >> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
> >> for allocation, the buffer needs to be freed using kvfree().
> >
> > You could just change the kexec core to call kvfree() instead.
>
> >
> >> Define "fdt" field in "struct kimage_arch" for powerpc to store
> >> the address of FDT, and free the memory in powerpc specific
> >> arch_kimage_file_post_load_cleanup().
> >
> > However, given all the other buffers have an explicit field in kimage
> > or kimage_arch, changing powerpc is to match arm64 is better IMO.
>
> Just to be clear:
> I'll leave this as is - free FDT buffer in powerpc's
> arch_kimage_file_post_load_cleanup() to match arm64 behavior.

Yes.

> Will not change "kexec core" to call kvfree() - doing that change would
> require changing all architectures to use kvmalloc() for
> image_loader_data allocation.

Actually, no. AIUI, kvfree() can be used whether you used kvmalloc,
vmalloc, or kmalloc for the alloc.

> >> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> >> Suggested-by: Rob Herring <robh@kernel.org>
> >> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> >> ---
> >>   arch/powerpc/include/asm/kexec.h  |  2 ++
> >>   arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
> >>   arch/powerpc/kexec/file_load_64.c |  3 +++
> >>   3 files changed, 21 insertions(+), 10 deletions(-)
> >>
> >> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
> >> index 2c0be93d239a..d7d13cac4d31 100644
> >> --- a/arch/powerpc/include/asm/kexec.h
> >> +++ b/arch/powerpc/include/asm/kexec.h
> >> @@ -111,6 +111,8 @@ struct kimage_arch {
> >>          unsigned long elf_headers_mem;
> >>          unsigned long elf_headers_sz;
> >>          void *elf_headers;
> >> +
> >> +       void *fdt;
> >>   };
> >>
> >>   char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
> >> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
> >> index d0e459bb2f05..51d2d8eb6c1b 100644
> >> --- a/arch/powerpc/kexec/elf_64.c
> >> +++ b/arch/powerpc/kexec/elf_64.c
> >> @@ -19,6 +19,7 @@
> >>   #include <linux/kexec.h>
> >>   #include <linux/libfdt.h>
> >>   #include <linux/module.h>
> >> +#include <linux/of.h>
> >>   #include <linux/of_fdt.h>
> >>   #include <linux/slab.h>
> >>   #include <linux/types.h>
> >> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
> >>          unsigned int fdt_size;
> >>          unsigned long kernel_load_addr;
> >>          unsigned long initrd_load_addr = 0, fdt_load_addr;
> >> -       void *fdt;
> >> +       void *fdt = NULL;
> >>          const void *slave_code;
> >>          struct elfhdr ehdr;
> >>          char *modified_cmdline = NULL;
> >> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
> >>          }
> >>
> >>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
> >> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
> >> +       fdt = of_alloc_and_init_fdt(fdt_size);
> >>          if (!fdt) {
> >>                  pr_err("Not enough memory for the device tree.\n");
> >>                  ret = -ENOMEM;
> >>                  goto out;
> >>          }
> >> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
> >> -       if (ret < 0) {
> >> -               pr_err("Error setting up the new device tree.\n");
> >> -               ret = -EINVAL;
> >> -               goto out;
> >> -       }
> >>
> >>          ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
> >
> > The first thing this function does is call setup_new_fdt() which first
> > calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> > PPC code split. It looks like there's a 32-bit and 64-bit split, but
> > 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> > setup_new_fdt_ppc64()). The arm64 version is calling
> > of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
> >
> > So we can just make of_alloc_and_init_fdt() also call
> > of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
> > the alloc and copy).
> ok - will move fdt allocation into of_kexec_setup_new_fdt().
>
> I don't think the architecture needs to pick the
> > size either. It's doubtful that either one is that sensitive to the
> > amount of extra space.
> I am not clear about the above comment -
> are you saying the architectures don't need to pass FDT size to the
> alloc function?
>
> arm64 is adding command line string length and some extra space to the
> size computed from initial_boot_params for FDT Size:
>
>         buf_size = fdt_totalsize(initial_boot_params)
>                         + cmdline_len + DTB_EXTRA_SPACE;
>
> powerpc is just using twice the size computed from initial_boot_params
>
>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
>
> I think it would be safe to let arm64 and powerpc pass the required FDT
> size, along with the other params to of_kexec_setup_new_fdt() - and in
> this function we allocate FDT and set it up.

It's pretty clear that someone just picked something that 'should be
enough'. The only thing I can guess for the difference is that arm
DT's tend to be a bit larger. So doubling the size would be even more
excessive. Either way, we're talking 10s kB to few 100kB. I'd go with
DTB_EXTRA_SPACE and we can bump it up if someone has problems.

Also, I would like for 'initial_boot_params' to be private ultimately,
so removing any references is helpful.

> And, for powerpc leave the remaining code in setup_new_fdt_ppc64().

Right.

Rob

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 23:36         ` Rob Herring
  0 siblings, 0 replies; 58+ messages in thread
From: Rob Herring @ 2021-02-04 23:36 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: Mark Rutland, Bhupesh Sharma, tao.li, Mimi Zohar, Paul Mackerras,
	vincenzo.frascino, Frank Rowand, Sasha Levin, Masahiro Yamada,
	James Morris, AKASHI, Takahiro, linux-arm-kernel,
	Catalin Marinas, Serge E. Hallyn, devicetree, Pavel Tatashin,
	Will Deacon, Prakhar Srivastava, Hsin-Yi Wang, Allison Randal,
	Christophe Leroy, Matthias Brugger, balajib, dmitry.kasatkin,
	linux-kernel, James Morse, Greg Kroah-Hartman, Joe Perches,
	linux-integrity, linuxppc-dev, Thiago Jung Bauermann

On Thu, Feb 4, 2021 at 5:23 PM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
>
> On 2/4/21 11:26 AM, Rob Herring wrote:
> > On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> > <nramas@linux.microsoft.com> wrote:
> >>
> >> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> >> drivers/of/kexec.c to allocate and free memory for FDT.
> >>
> >> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> >> initialize the FDT, and to free the FDT respectively.
> >>
> >> powerpc sets the FDT address in image_loader_data field in
> >> "struct kimage" and the memory is freed in
> >> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
> >> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
> >> for allocation, the buffer needs to be freed using kvfree().
> >
> > You could just change the kexec core to call kvfree() instead.
>
> >
> >> Define "fdt" field in "struct kimage_arch" for powerpc to store
> >> the address of FDT, and free the memory in powerpc specific
> >> arch_kimage_file_post_load_cleanup().
> >
> > However, given all the other buffers have an explicit field in kimage
> > or kimage_arch, changing powerpc is to match arm64 is better IMO.
>
> Just to be clear:
> I'll leave this as is - free FDT buffer in powerpc's
> arch_kimage_file_post_load_cleanup() to match arm64 behavior.

Yes.

> Will not change "kexec core" to call kvfree() - doing that change would
> require changing all architectures to use kvmalloc() for
> image_loader_data allocation.

Actually, no. AIUI, kvfree() can be used whether you used kvmalloc,
vmalloc, or kmalloc for the alloc.

> >> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> >> Suggested-by: Rob Herring <robh@kernel.org>
> >> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> >> ---
> >>   arch/powerpc/include/asm/kexec.h  |  2 ++
> >>   arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
> >>   arch/powerpc/kexec/file_load_64.c |  3 +++
> >>   3 files changed, 21 insertions(+), 10 deletions(-)
> >>
> >> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
> >> index 2c0be93d239a..d7d13cac4d31 100644
> >> --- a/arch/powerpc/include/asm/kexec.h
> >> +++ b/arch/powerpc/include/asm/kexec.h
> >> @@ -111,6 +111,8 @@ struct kimage_arch {
> >>          unsigned long elf_headers_mem;
> >>          unsigned long elf_headers_sz;
> >>          void *elf_headers;
> >> +
> >> +       void *fdt;
> >>   };
> >>
> >>   char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
> >> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
> >> index d0e459bb2f05..51d2d8eb6c1b 100644
> >> --- a/arch/powerpc/kexec/elf_64.c
> >> +++ b/arch/powerpc/kexec/elf_64.c
> >> @@ -19,6 +19,7 @@
> >>   #include <linux/kexec.h>
> >>   #include <linux/libfdt.h>
> >>   #include <linux/module.h>
> >> +#include <linux/of.h>
> >>   #include <linux/of_fdt.h>
> >>   #include <linux/slab.h>
> >>   #include <linux/types.h>
> >> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
> >>          unsigned int fdt_size;
> >>          unsigned long kernel_load_addr;
> >>          unsigned long initrd_load_addr = 0, fdt_load_addr;
> >> -       void *fdt;
> >> +       void *fdt = NULL;
> >>          const void *slave_code;
> >>          struct elfhdr ehdr;
> >>          char *modified_cmdline = NULL;
> >> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
> >>          }
> >>
> >>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
> >> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
> >> +       fdt = of_alloc_and_init_fdt(fdt_size);
> >>          if (!fdt) {
> >>                  pr_err("Not enough memory for the device tree.\n");
> >>                  ret = -ENOMEM;
> >>                  goto out;
> >>          }
> >> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
> >> -       if (ret < 0) {
> >> -               pr_err("Error setting up the new device tree.\n");
> >> -               ret = -EINVAL;
> >> -               goto out;
> >> -       }
> >>
> >>          ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
> >
> > The first thing this function does is call setup_new_fdt() which first
> > calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> > PPC code split. It looks like there's a 32-bit and 64-bit split, but
> > 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> > setup_new_fdt_ppc64()). The arm64 version is calling
> > of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
> >
> > So we can just make of_alloc_and_init_fdt() also call
> > of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
> > the alloc and copy).
> ok - will move fdt allocation into of_kexec_setup_new_fdt().
>
> I don't think the architecture needs to pick the
> > size either. It's doubtful that either one is that sensitive to the
> > amount of extra space.
> I am not clear about the above comment -
> are you saying the architectures don't need to pass FDT size to the
> alloc function?
>
> arm64 is adding command line string length and some extra space to the
> size computed from initial_boot_params for FDT Size:
>
>         buf_size = fdt_totalsize(initial_boot_params)
>                         + cmdline_len + DTB_EXTRA_SPACE;
>
> powerpc is just using twice the size computed from initial_boot_params
>
>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
>
> I think it would be safe to let arm64 and powerpc pass the required FDT
> size, along with the other params to of_kexec_setup_new_fdt() - and in
> this function we allocate FDT and set it up.

It's pretty clear that someone just picked something that 'should be
enough'. The only thing I can guess for the difference is that arm
DT's tend to be a bit larger. So doubling the size would be even more
excessive. Either way, we're talking 10s kB to few 100kB. I'd go with
DTB_EXTRA_SPACE and we can bump it up if someone has problems.

Also, I would like for 'initial_boot_params' to be private ultimately,
so removing any references is helpful.

> And, for powerpc leave the remaining code in setup_new_fdt_ppc64().

Right.

Rob

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 23:36         ` Rob Herring
  0 siblings, 0 replies; 58+ messages in thread
From: Rob Herring @ 2021-02-04 23:36 UTC (permalink / raw)
  To: Lakshmi Ramasubramanian
  Cc: Mark Rutland, Benjamin Herrenschmidt, Bhupesh Sharma, tao.li,
	Mimi Zohar, Paul Mackerras, vincenzo.frascino, Frank Rowand,
	Sasha Levin, Michael Ellerman, Masahiro Yamada, James Morris,
	AKASHI, Takahiro, linux-arm-kernel, Catalin Marinas,
	Serge E. Hallyn, devicetree, Pavel Tatashin, Will Deacon,
	Prakhar Srivastava, Hsin-Yi Wang, Allison Randal,
	Christophe Leroy, Matthias Brugger, balajib, dmitry.kasatkin,
	linux-kernel, James Morse, Greg Kroah-Hartman, Joe Perches,
	linux-integrity, linuxppc-dev, Thiago Jung Bauermann

On Thu, Feb 4, 2021 at 5:23 PM Lakshmi Ramasubramanian
<nramas@linux.microsoft.com> wrote:
>
> On 2/4/21 11:26 AM, Rob Herring wrote:
> > On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> > <nramas@linux.microsoft.com> wrote:
> >>
> >> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
> >> drivers/of/kexec.c to allocate and free memory for FDT.
> >>
> >> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
> >> initialize the FDT, and to free the FDT respectively.
> >>
> >> powerpc sets the FDT address in image_loader_data field in
> >> "struct kimage" and the memory is freed in
> >> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
> >> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
> >> for allocation, the buffer needs to be freed using kvfree().
> >
> > You could just change the kexec core to call kvfree() instead.
>
> >
> >> Define "fdt" field in "struct kimage_arch" for powerpc to store
> >> the address of FDT, and free the memory in powerpc specific
> >> arch_kimage_file_post_load_cleanup().
> >
> > However, given all the other buffers have an explicit field in kimage
> > or kimage_arch, changing powerpc is to match arm64 is better IMO.
>
> Just to be clear:
> I'll leave this as is - free FDT buffer in powerpc's
> arch_kimage_file_post_load_cleanup() to match arm64 behavior.

Yes.

> Will not change "kexec core" to call kvfree() - doing that change would
> require changing all architectures to use kvmalloc() for
> image_loader_data allocation.

Actually, no. AIUI, kvfree() can be used whether you used kvmalloc,
vmalloc, or kmalloc for the alloc.

> >> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> >> Suggested-by: Rob Herring <robh@kernel.org>
> >> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
> >> ---
> >>   arch/powerpc/include/asm/kexec.h  |  2 ++
> >>   arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
> >>   arch/powerpc/kexec/file_load_64.c |  3 +++
> >>   3 files changed, 21 insertions(+), 10 deletions(-)
> >>
> >> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
> >> index 2c0be93d239a..d7d13cac4d31 100644
> >> --- a/arch/powerpc/include/asm/kexec.h
> >> +++ b/arch/powerpc/include/asm/kexec.h
> >> @@ -111,6 +111,8 @@ struct kimage_arch {
> >>          unsigned long elf_headers_mem;
> >>          unsigned long elf_headers_sz;
> >>          void *elf_headers;
> >> +
> >> +       void *fdt;
> >>   };
> >>
> >>   char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
> >> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
> >> index d0e459bb2f05..51d2d8eb6c1b 100644
> >> --- a/arch/powerpc/kexec/elf_64.c
> >> +++ b/arch/powerpc/kexec/elf_64.c
> >> @@ -19,6 +19,7 @@
> >>   #include <linux/kexec.h>
> >>   #include <linux/libfdt.h>
> >>   #include <linux/module.h>
> >> +#include <linux/of.h>
> >>   #include <linux/of_fdt.h>
> >>   #include <linux/slab.h>
> >>   #include <linux/types.h>
> >> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
> >>          unsigned int fdt_size;
> >>          unsigned long kernel_load_addr;
> >>          unsigned long initrd_load_addr = 0, fdt_load_addr;
> >> -       void *fdt;
> >> +       void *fdt = NULL;
> >>          const void *slave_code;
> >>          struct elfhdr ehdr;
> >>          char *modified_cmdline = NULL;
> >> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
> >>          }
> >>
> >>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
> >> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
> >> +       fdt = of_alloc_and_init_fdt(fdt_size);
> >>          if (!fdt) {
> >>                  pr_err("Not enough memory for the device tree.\n");
> >>                  ret = -ENOMEM;
> >>                  goto out;
> >>          }
> >> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
> >> -       if (ret < 0) {
> >> -               pr_err("Error setting up the new device tree.\n");
> >> -               ret = -EINVAL;
> >> -               goto out;
> >> -       }
> >>
> >>          ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
> >
> > The first thing this function does is call setup_new_fdt() which first
> > calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> > PPC code split. It looks like there's a 32-bit and 64-bit split, but
> > 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> > setup_new_fdt_ppc64()). The arm64 version is calling
> > of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
> >
> > So we can just make of_alloc_and_init_fdt() also call
> > of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
> > the alloc and copy).
> ok - will move fdt allocation into of_kexec_setup_new_fdt().
>
> I don't think the architecture needs to pick the
> > size either. It's doubtful that either one is that sensitive to the
> > amount of extra space.
> I am not clear about the above comment -
> are you saying the architectures don't need to pass FDT size to the
> alloc function?
>
> arm64 is adding command line string length and some extra space to the
> size computed from initial_boot_params for FDT Size:
>
>         buf_size = fdt_totalsize(initial_boot_params)
>                         + cmdline_len + DTB_EXTRA_SPACE;
>
> powerpc is just using twice the size computed from initial_boot_params
>
>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
>
> I think it would be safe to let arm64 and powerpc pass the required FDT
> size, along with the other params to of_kexec_setup_new_fdt() - and in
> this function we allocate FDT and set it up.

It's pretty clear that someone just picked something that 'should be
enough'. The only thing I can guess for the difference is that arm
DT's tend to be a bit larger. So doubling the size would be even more
excessive. Either way, we're talking 10s kB to few 100kB. I'd go with
DTB_EXTRA_SPACE and we can bump it up if someone has problems.

Also, I would like for 'initial_boot_params' to be private ultimately,
so removing any references is helpful.

> And, for powerpc leave the remaining code in setup_new_fdt_ppc64().

Right.

Rob

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
  2021-02-04 23:36         ` Rob Herring
  (?)
@ 2021-02-04 23:42           ` Lakshmi Ramasubramanian
  -1 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 23:42 UTC (permalink / raw)
  To: Rob Herring
  Cc: Mimi Zohar, Thiago Jung Bauermann, AKASHI, Takahiro,
	Greg Kroah-Hartman, Will Deacon, Joe Perches, Catalin Marinas,
	Michael Ellerman, James Morse, Sasha Levin,
	Benjamin Herrenschmidt, Paul Mackerras, Frank Rowand,
	vincenzo.frascino, Mark Rutland, dmitry.kasatkin, James Morris,
	Serge E. Hallyn, Pavel Tatashin, Allison Randal, Masahiro Yamada,
	Matthias Brugger, Hsin-Yi Wang, tao.li, Christophe Leroy,
	Prakhar Srivastava, balajib, linux-integrity, linux-kernel,
	linux-arm-kernel, devicetree, linuxppc-dev

On 2/4/21 3:36 PM, Rob Herring wrote:
> On Thu, Feb 4, 2021 at 5:23 PM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
>>
>> On 2/4/21 11:26 AM, Rob Herring wrote:
>>> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
>>> <nramas@linux.microsoft.com> wrote:
>>>>
>>>> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
>>>> drivers/of/kexec.c to allocate and free memory for FDT.
>>>>
>>>> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
>>>> initialize the FDT, and to free the FDT respectively.
>>>>
>>>> powerpc sets the FDT address in image_loader_data field in
>>>> "struct kimage" and the memory is freed in
>>>> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
>>>> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
>>>> for allocation, the buffer needs to be freed using kvfree().
>>>
>>> You could just change the kexec core to call kvfree() instead.
>>
>>>
>>>> Define "fdt" field in "struct kimage_arch" for powerpc to store
>>>> the address of FDT, and free the memory in powerpc specific
>>>> arch_kimage_file_post_load_cleanup().
>>>
>>> However, given all the other buffers have an explicit field in kimage
>>> or kimage_arch, changing powerpc is to match arm64 is better IMO.
>>
>> Just to be clear:
>> I'll leave this as is - free FDT buffer in powerpc's
>> arch_kimage_file_post_load_cleanup() to match arm64 behavior.
> 
> Yes.

ok

> 
>> Will not change "kexec core" to call kvfree() - doing that change would
>> require changing all architectures to use kvmalloc() for
>> image_loader_data allocation.
> 
> Actually, no. AIUI, kvfree() can be used whether you used kvmalloc,
> vmalloc, or kmalloc for the alloc.
That is good information. Thanks.

> 
>>>> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>>>> Suggested-by: Rob Herring <robh@kernel.org>
>>>> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>>>> ---
>>>>    arch/powerpc/include/asm/kexec.h  |  2 ++
>>>>    arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>>>>    arch/powerpc/kexec/file_load_64.c |  3 +++
>>>>    3 files changed, 21 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
>>>> index 2c0be93d239a..d7d13cac4d31 100644
>>>> --- a/arch/powerpc/include/asm/kexec.h
>>>> +++ b/arch/powerpc/include/asm/kexec.h
>>>> @@ -111,6 +111,8 @@ struct kimage_arch {
>>>>           unsigned long elf_headers_mem;
>>>>           unsigned long elf_headers_sz;
>>>>           void *elf_headers;
>>>> +
>>>> +       void *fdt;
>>>>    };
>>>>
>>>>    char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
>>>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>>>> index d0e459bb2f05..51d2d8eb6c1b 100644
>>>> --- a/arch/powerpc/kexec/elf_64.c
>>>> +++ b/arch/powerpc/kexec/elf_64.c
>>>> @@ -19,6 +19,7 @@
>>>>    #include <linux/kexec.h>
>>>>    #include <linux/libfdt.h>
>>>>    #include <linux/module.h>
>>>> +#include <linux/of.h>
>>>>    #include <linux/of_fdt.h>
>>>>    #include <linux/slab.h>
>>>>    #include <linux/types.h>
>>>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>>>           unsigned int fdt_size;
>>>>           unsigned long kernel_load_addr;
>>>>           unsigned long initrd_load_addr = 0, fdt_load_addr;
>>>> -       void *fdt;
>>>> +       void *fdt = NULL;
>>>>           const void *slave_code;
>>>>           struct elfhdr ehdr;
>>>>           char *modified_cmdline = NULL;
>>>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>>>           }
>>>>
>>>>           fdt_size = fdt_totalsize(initial_boot_params) * 2;
>>>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>>>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>>>           if (!fdt) {
>>>>                   pr_err("Not enough memory for the device tree.\n");
>>>>                   ret = -ENOMEM;
>>>>                   goto out;
>>>>           }
>>>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>>>> -       if (ret < 0) {
>>>> -               pr_err("Error setting up the new device tree.\n");
>>>> -               ret = -EINVAL;
>>>> -               goto out;
>>>> -       }
>>>>
>>>>           ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
>>>
>>> The first thing this function does is call setup_new_fdt() which first
>>> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
>>> PPC code split. It looks like there's a 32-bit and 64-bit split, but
>>> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
>>> setup_new_fdt_ppc64()). The arm64 version is calling
>>> of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
>>>
>>> So we can just make of_alloc_and_init_fdt() also call
>>> of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
>>> the alloc and copy).
>> ok - will move fdt allocation into of_kexec_setup_new_fdt().
>>
>> I don't think the architecture needs to pick the
>>> size either. It's doubtful that either one is that sensitive to the
>>> amount of extra space.
>> I am not clear about the above comment -
>> are you saying the architectures don't need to pass FDT size to the
>> alloc function?
>>
>> arm64 is adding command line string length and some extra space to the
>> size computed from initial_boot_params for FDT Size:
>>
>>          buf_size = fdt_totalsize(initial_boot_params)
>>                          + cmdline_len + DTB_EXTRA_SPACE;
>>
>> powerpc is just using twice the size computed from initial_boot_params
>>
>>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
>>
>> I think it would be safe to let arm64 and powerpc pass the required FDT
>> size, along with the other params to of_kexec_setup_new_fdt() - and in
>> this function we allocate FDT and set it up.
> 
> It's pretty clear that someone just picked something that 'should be
> enough'. The only thing I can guess for the difference is that arm
> DT's tend to be a bit larger. So doubling the size would be even more
> excessive. Either way, we're talking 10s kB to few 100kB. I'd go with
> DTB_EXTRA_SPACE and we can bump it up if someone has problems.
ok - I'll use DTB_EXTRA_SPACE for the fdt allocation.

> 
> Also, I would like for 'initial_boot_params' to be private ultimately,
> so removing any references is helpful.
ok

> 
>> And, for powerpc leave the remaining code in setup_new_fdt_ppc64().
> 
> Right.
ok

thanks,
  -lakshmi

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 23:42           ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 23:42 UTC (permalink / raw)
  To: Rob Herring
  Cc: Mark Rutland, tao.li, Mimi Zohar, Paul Mackerras,
	vincenzo.frascino, Frank Rowand, Sasha Levin, Masahiro Yamada,
	James Morris, AKASHI, Takahiro, linux-arm-kernel,
	Catalin Marinas, Serge E. Hallyn, devicetree, Pavel Tatashin,
	Will Deacon, Prakhar Srivastava, Hsin-Yi Wang, Allison Randal,
	Christophe Leroy, Matthias Brugger, balajib, dmitry.kasatkin,
	linux-kernel, James Morse, Greg Kroah-Hartman, Joe Perches,
	linux-integrity, linuxppc-dev, Thiago Jung Bauermann

On 2/4/21 3:36 PM, Rob Herring wrote:
> On Thu, Feb 4, 2021 at 5:23 PM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
>>
>> On 2/4/21 11:26 AM, Rob Herring wrote:
>>> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
>>> <nramas@linux.microsoft.com> wrote:
>>>>
>>>> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
>>>> drivers/of/kexec.c to allocate and free memory for FDT.
>>>>
>>>> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
>>>> initialize the FDT, and to free the FDT respectively.
>>>>
>>>> powerpc sets the FDT address in image_loader_data field in
>>>> "struct kimage" and the memory is freed in
>>>> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
>>>> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
>>>> for allocation, the buffer needs to be freed using kvfree().
>>>
>>> You could just change the kexec core to call kvfree() instead.
>>
>>>
>>>> Define "fdt" field in "struct kimage_arch" for powerpc to store
>>>> the address of FDT, and free the memory in powerpc specific
>>>> arch_kimage_file_post_load_cleanup().
>>>
>>> However, given all the other buffers have an explicit field in kimage
>>> or kimage_arch, changing powerpc is to match arm64 is better IMO.
>>
>> Just to be clear:
>> I'll leave this as is - free FDT buffer in powerpc's
>> arch_kimage_file_post_load_cleanup() to match arm64 behavior.
> 
> Yes.

ok

> 
>> Will not change "kexec core" to call kvfree() - doing that change would
>> require changing all architectures to use kvmalloc() for
>> image_loader_data allocation.
> 
> Actually, no. AIUI, kvfree() can be used whether you used kvmalloc,
> vmalloc, or kmalloc for the alloc.
That is good information. Thanks.

> 
>>>> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>>>> Suggested-by: Rob Herring <robh@kernel.org>
>>>> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>>>> ---
>>>>    arch/powerpc/include/asm/kexec.h  |  2 ++
>>>>    arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>>>>    arch/powerpc/kexec/file_load_64.c |  3 +++
>>>>    3 files changed, 21 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
>>>> index 2c0be93d239a..d7d13cac4d31 100644
>>>> --- a/arch/powerpc/include/asm/kexec.h
>>>> +++ b/arch/powerpc/include/asm/kexec.h
>>>> @@ -111,6 +111,8 @@ struct kimage_arch {
>>>>           unsigned long elf_headers_mem;
>>>>           unsigned long elf_headers_sz;
>>>>           void *elf_headers;
>>>> +
>>>> +       void *fdt;
>>>>    };
>>>>
>>>>    char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
>>>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>>>> index d0e459bb2f05..51d2d8eb6c1b 100644
>>>> --- a/arch/powerpc/kexec/elf_64.c
>>>> +++ b/arch/powerpc/kexec/elf_64.c
>>>> @@ -19,6 +19,7 @@
>>>>    #include <linux/kexec.h>
>>>>    #include <linux/libfdt.h>
>>>>    #include <linux/module.h>
>>>> +#include <linux/of.h>
>>>>    #include <linux/of_fdt.h>
>>>>    #include <linux/slab.h>
>>>>    #include <linux/types.h>
>>>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>>>           unsigned int fdt_size;
>>>>           unsigned long kernel_load_addr;
>>>>           unsigned long initrd_load_addr = 0, fdt_load_addr;
>>>> -       void *fdt;
>>>> +       void *fdt = NULL;
>>>>           const void *slave_code;
>>>>           struct elfhdr ehdr;
>>>>           char *modified_cmdline = NULL;
>>>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>>>           }
>>>>
>>>>           fdt_size = fdt_totalsize(initial_boot_params) * 2;
>>>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>>>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>>>           if (!fdt) {
>>>>                   pr_err("Not enough memory for the device tree.\n");
>>>>                   ret = -ENOMEM;
>>>>                   goto out;
>>>>           }
>>>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>>>> -       if (ret < 0) {
>>>> -               pr_err("Error setting up the new device tree.\n");
>>>> -               ret = -EINVAL;
>>>> -               goto out;
>>>> -       }
>>>>
>>>>           ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
>>>
>>> The first thing this function does is call setup_new_fdt() which first
>>> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
>>> PPC code split. It looks like there's a 32-bit and 64-bit split, but
>>> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
>>> setup_new_fdt_ppc64()). The arm64 version is calling
>>> of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
>>>
>>> So we can just make of_alloc_and_init_fdt() also call
>>> of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
>>> the alloc and copy).
>> ok - will move fdt allocation into of_kexec_setup_new_fdt().
>>
>> I don't think the architecture needs to pick the
>>> size either. It's doubtful that either one is that sensitive to the
>>> amount of extra space.
>> I am not clear about the above comment -
>> are you saying the architectures don't need to pass FDT size to the
>> alloc function?
>>
>> arm64 is adding command line string length and some extra space to the
>> size computed from initial_boot_params for FDT Size:
>>
>>          buf_size = fdt_totalsize(initial_boot_params)
>>                          + cmdline_len + DTB_EXTRA_SPACE;
>>
>> powerpc is just using twice the size computed from initial_boot_params
>>
>>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
>>
>> I think it would be safe to let arm64 and powerpc pass the required FDT
>> size, along with the other params to of_kexec_setup_new_fdt() - and in
>> this function we allocate FDT and set it up.
> 
> It's pretty clear that someone just picked something that 'should be
> enough'. The only thing I can guess for the difference is that arm
> DT's tend to be a bit larger. So doubling the size would be even more
> excessive. Either way, we're talking 10s kB to few 100kB. I'd go with
> DTB_EXTRA_SPACE and we can bump it up if someone has problems.
ok - I'll use DTB_EXTRA_SPACE for the fdt allocation.

> 
> Also, I would like for 'initial_boot_params' to be private ultimately,
> so removing any references is helpful.
ok

> 
>> And, for powerpc leave the remaining code in setup_new_fdt_ppc64().
> 
> Right.
ok

thanks,
  -lakshmi

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-04 23:42           ` Lakshmi Ramasubramanian
  0 siblings, 0 replies; 58+ messages in thread
From: Lakshmi Ramasubramanian @ 2021-02-04 23:42 UTC (permalink / raw)
  To: Rob Herring
  Cc: Mark Rutland, Benjamin Herrenschmidt, tao.li, Mimi Zohar,
	Paul Mackerras, vincenzo.frascino, Frank Rowand, Sasha Levin,
	Michael Ellerman, Masahiro Yamada, James Morris, AKASHI,
	Takahiro, linux-arm-kernel, Catalin Marinas, Serge E. Hallyn,
	devicetree, Pavel Tatashin, Will Deacon, Prakhar Srivastava,
	Hsin-Yi Wang, Allison Randal, Christophe Leroy, Matthias Brugger,
	balajib, dmitry.kasatkin, linux-kernel, James Morse,
	Greg Kroah-Hartman, Joe Perches, linux-integrity, linuxppc-dev,
	Thiago Jung Bauermann

On 2/4/21 3:36 PM, Rob Herring wrote:
> On Thu, Feb 4, 2021 at 5:23 PM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
>>
>> On 2/4/21 11:26 AM, Rob Herring wrote:
>>> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
>>> <nramas@linux.microsoft.com> wrote:
>>>>
>>>> of_alloc_and_init_fdt() and of_free_fdt() have been defined in
>>>> drivers/of/kexec.c to allocate and free memory for FDT.
>>>>
>>>> Use of_alloc_and_init_fdt() and of_free_fdt() to allocate and
>>>> initialize the FDT, and to free the FDT respectively.
>>>>
>>>> powerpc sets the FDT address in image_loader_data field in
>>>> "struct kimage" and the memory is freed in
>>>> kimage_file_post_load_cleanup().  This cleanup function uses kfree()
>>>> to free the memory. But since of_alloc_and_init_fdt() uses kvmalloc()
>>>> for allocation, the buffer needs to be freed using kvfree().
>>>
>>> You could just change the kexec core to call kvfree() instead.
>>
>>>
>>>> Define "fdt" field in "struct kimage_arch" for powerpc to store
>>>> the address of FDT, and free the memory in powerpc specific
>>>> arch_kimage_file_post_load_cleanup().
>>>
>>> However, given all the other buffers have an explicit field in kimage
>>> or kimage_arch, changing powerpc is to match arm64 is better IMO.
>>
>> Just to be clear:
>> I'll leave this as is - free FDT buffer in powerpc's
>> arch_kimage_file_post_load_cleanup() to match arm64 behavior.
> 
> Yes.

ok

> 
>> Will not change "kexec core" to call kvfree() - doing that change would
>> require changing all architectures to use kvmalloc() for
>> image_loader_data allocation.
> 
> Actually, no. AIUI, kvfree() can be used whether you used kvmalloc,
> vmalloc, or kmalloc for the alloc.
That is good information. Thanks.

> 
>>>> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
>>>> Suggested-by: Rob Herring <robh@kernel.org>
>>>> Suggested-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
>>>> ---
>>>>    arch/powerpc/include/asm/kexec.h  |  2 ++
>>>>    arch/powerpc/kexec/elf_64.c       | 26 ++++++++++++++++----------
>>>>    arch/powerpc/kexec/file_load_64.c |  3 +++
>>>>    3 files changed, 21 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
>>>> index 2c0be93d239a..d7d13cac4d31 100644
>>>> --- a/arch/powerpc/include/asm/kexec.h
>>>> +++ b/arch/powerpc/include/asm/kexec.h
>>>> @@ -111,6 +111,8 @@ struct kimage_arch {
>>>>           unsigned long elf_headers_mem;
>>>>           unsigned long elf_headers_sz;
>>>>           void *elf_headers;
>>>> +
>>>> +       void *fdt;
>>>>    };
>>>>
>>>>    char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
>>>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>>>> index d0e459bb2f05..51d2d8eb6c1b 100644
>>>> --- a/arch/powerpc/kexec/elf_64.c
>>>> +++ b/arch/powerpc/kexec/elf_64.c
>>>> @@ -19,6 +19,7 @@
>>>>    #include <linux/kexec.h>
>>>>    #include <linux/libfdt.h>
>>>>    #include <linux/module.h>
>>>> +#include <linux/of.h>
>>>>    #include <linux/of_fdt.h>
>>>>    #include <linux/slab.h>
>>>>    #include <linux/types.h>
>>>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>>>           unsigned int fdt_size;
>>>>           unsigned long kernel_load_addr;
>>>>           unsigned long initrd_load_addr = 0, fdt_load_addr;
>>>> -       void *fdt;
>>>> +       void *fdt = NULL;
>>>>           const void *slave_code;
>>>>           struct elfhdr ehdr;
>>>>           char *modified_cmdline = NULL;
>>>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>>>           }
>>>>
>>>>           fdt_size = fdt_totalsize(initial_boot_params) * 2;
>>>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>>>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>>>           if (!fdt) {
>>>>                   pr_err("Not enough memory for the device tree.\n");
>>>>                   ret = -ENOMEM;
>>>>                   goto out;
>>>>           }
>>>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>>>> -       if (ret < 0) {
>>>> -               pr_err("Error setting up the new device tree.\n");
>>>> -               ret = -EINVAL;
>>>> -               goto out;
>>>> -       }
>>>>
>>>>           ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
>>>
>>> The first thing this function does is call setup_new_fdt() which first
>>> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
>>> PPC code split. It looks like there's a 32-bit and 64-bit split, but
>>> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
>>> setup_new_fdt_ppc64()). The arm64 version is calling
>>> of_alloc_and_init_fdt() and then of_kexec_setup_new_fdt() directly.
>>>
>>> So we can just make of_alloc_and_init_fdt() also call
>>> of_kexec_setup_new_fdt() (really, just tweak of_kexec_setup_new_fdt do
>>> the alloc and copy).
>> ok - will move fdt allocation into of_kexec_setup_new_fdt().
>>
>> I don't think the architecture needs to pick the
>>> size either. It's doubtful that either one is that sensitive to the
>>> amount of extra space.
>> I am not clear about the above comment -
>> are you saying the architectures don't need to pass FDT size to the
>> alloc function?
>>
>> arm64 is adding command line string length and some extra space to the
>> size computed from initial_boot_params for FDT Size:
>>
>>          buf_size = fdt_totalsize(initial_boot_params)
>>                          + cmdline_len + DTB_EXTRA_SPACE;
>>
>> powerpc is just using twice the size computed from initial_boot_params
>>
>>          fdt_size = fdt_totalsize(initial_boot_params) * 2;
>>
>> I think it would be safe to let arm64 and powerpc pass the required FDT
>> size, along with the other params to of_kexec_setup_new_fdt() - and in
>> this function we allocate FDT and set it up.
> 
> It's pretty clear that someone just picked something that 'should be
> enough'. The only thing I can guess for the difference is that arm
> DT's tend to be a bit larger. So doubling the size would be even more
> excessive. Either way, we're talking 10s kB to few 100kB. I'd go with
> DTB_EXTRA_SPACE and we can bump it up if someone has problems.
ok - I'll use DTB_EXTRA_SPACE for the fdt allocation.

> 
> Also, I would like for 'initial_boot_params' to be private ultimately,
> so removing any references is helpful.
ok

> 
>> And, for powerpc leave the remaining code in setup_new_fdt_ppc64().
> 
> Right.
ok

thanks,
  -lakshmi

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^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 02/12] of: Add a common kexec FDT setup function
  2021-02-04 16:41   ` Lakshmi Ramasubramanian
  (?)
  (?)
@ 2021-02-06 23:38   ` kernel test robot
  -1 siblings, 0 replies; 58+ messages in thread
From: kernel test robot @ 2021-02-06 23:38 UTC (permalink / raw)
  To: kbuild-all

[-- Attachment #1: Type: text/plain, Size: 4444 bytes --]

Hi Lakshmi,

I love your patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on robh/for-next arm64/for-next/core v5.11-rc6 next-20210125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Lakshmi-Ramasubramanian/Carry-forward-IMA-measurement-log-on-kexec-on-ARM64/20210205-010018
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: x86_64-randconfig-a006-20210205 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/029dfec178c52eaec7d685d81c9b0a08da337d66
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Lakshmi-Ramasubramanian/Carry-forward-IMA-measurement-log-on-kexec-on-ARM64/20210205-010018
        git checkout 029dfec178c52eaec7d685d81c9b0a08da337d66
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/x86/include/asm/user_64.h:6,
                    from arch/x86/include/asm/user.h:8,
                    from include/linux/user.h:1,
                    from include/linux/elfcore.h:5,
                    from include/linux/crash_core.h:6,
                    from include/linux/kexec.h:18,
                    from drivers/of/kexec.c:13:
   drivers/of/kexec.c: In function 'of_kexec_setup_new_fdt':
>> drivers/of/kexec.c:86:43: error: 'initial_boot_params' undeclared (first use in this function)
      86 |  ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
         |                                           ^~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/page.h:42:46: note: in definition of macro '__pa'
      42 | #define __pa(x)  __phys_addr((unsigned long)(x))
         |                                              ^
   drivers/of/kexec.c:86:43: note: each undeclared identifier is reported only once for each function it appears in
      86 |  ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),
         |                                           ^~~~~~~~~~~~~~~~~~~
   arch/x86/include/asm/page.h:42:46: note: in definition of macro '__pa'
      42 | #define __pa(x)  __phys_addr((unsigned long)(x))
         |                                              ^
   drivers/of/kexec.c:163:17: error: 'const struct kimage_arch' has no member named 'elf_headers_mem'; did you mean 'elf_headers_sz'?
     163 |     image->arch.elf_headers_mem,
         |                 ^~~~~~~~~~~~~~~
         |                 elf_headers_sz
   drivers/of/kexec.c:172:42: error: 'const struct kimage_arch' has no member named 'elf_headers_mem'; did you mean 'elf_headers_sz'?
     172 |   ret = fdt_add_mem_rsv(fdt, image->arch.elf_headers_mem,
         |                                          ^~~~~~~~~~~~~~~
         |                                          elf_headers_sz


vim +/initial_boot_params +86 drivers/of/kexec.c

    65	
    66	/*
    67	 * of_kexec_setup_new_fdt - modify /chosen and memory reservation for the next kernel
    68	 *
    69	 * @image:		kexec image being loaded.
    70	 * @fdt:		Flattened device tree for the next kernel.
    71	 * @initrd_load_addr:	Address where the next initrd will be loaded.
    72	 * @initrd_len:		Size of the next initrd, or 0 if there will be none.
    73	 * @cmdline:		Command line for the next kernel, or NULL if there will
    74	 *			be none.
    75	 *
    76	 * Return: 0 on success, or negative errno on error.
    77	 */
    78	int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt,
    79				   unsigned long initrd_load_addr, unsigned long initrd_len,
    80				   const char *cmdline)
    81	{
    82		int ret, chosen_node;
    83		const void *prop;
    84	
    85		/* Remove memory reservation for the current device tree. */
  > 86		ret = fdt_find_and_del_mem_rsv(fdt, __pa(initial_boot_params),

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

[-- Attachment #2: config.gz --]
[-- Type: application/gzip, Size: 34394 bytes --]

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
  2021-02-04 19:26     ` Rob Herring
  (?)
@ 2021-02-08  4:12       ` Michael Ellerman
  -1 siblings, 0 replies; 58+ messages in thread
From: Michael Ellerman @ 2021-02-08  4:12 UTC (permalink / raw)
  To: Rob Herring, Lakshmi Ramasubramanian
  Cc: Mimi Zohar, Thiago Jung Bauermann, AKASHI, Takahiro,
	Greg Kroah-Hartman, Will Deacon, Joe Perches, Catalin Marinas,
	James Morse, Sasha Levin, Benjamin Herrenschmidt, Paul Mackerras,
	Frank Rowand, vincenzo.frascino, Mark Rutland, dmitry.kasatkin,
	James Morris, Serge E. Hallyn, Pavel Tatashin, Allison Randal,
	Masahiro Yamada, Bhupesh Sharma, Matthias Brugger, Hsin-Yi Wang,
	tao.li, Christophe Leroy, Prakhar Srivastava, balajib,
	linux-integrity, linux-kernel, linux-arm-kernel, devicetree,
	linuxppc-dev

Rob Herring <robh@kernel.org> writes:
> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
...
>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>> index d0e459bb2f05..51d2d8eb6c1b 100644
>> --- a/arch/powerpc/kexec/elf_64.c
>> +++ b/arch/powerpc/kexec/elf_64.c
>> @@ -19,6 +19,7 @@
>>  #include <linux/kexec.h>
>>  #include <linux/libfdt.h>
>>  #include <linux/module.h>
>> +#include <linux/of.h>
>>  #include <linux/of_fdt.h>
>>  #include <linux/slab.h>
>>  #include <linux/types.h>
>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>         unsigned int fdt_size;
>>         unsigned long kernel_load_addr;
>>         unsigned long initrd_load_addr = 0, fdt_load_addr;
>> -       void *fdt;
>> +       void *fdt = NULL;
>>         const void *slave_code;
>>         struct elfhdr ehdr;
>>         char *modified_cmdline = NULL;
>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>         }
>>
>>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>         if (!fdt) {
>>                 pr_err("Not enough memory for the device tree.\n");
>>                 ret = -ENOMEM;
>>                 goto out;
>>         }
>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>> -       if (ret < 0) {
>> -               pr_err("Error setting up the new device tree.\n");
>> -               ret = -EINVAL;
>> -               goto out;
>> -       }
>>
>>         ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
>
> The first thing this function does is call setup_new_fdt() which first
> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> PPC code split. It looks like there's a 32-bit and 64-bit split, but
> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> setup_new_fdt_ppc64()).

I think that's because 32-bit doesn't support kexec_file_load().

cheers

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-08  4:12       ` Michael Ellerman
  0 siblings, 0 replies; 58+ messages in thread
From: Michael Ellerman @ 2021-02-08  4:12 UTC (permalink / raw)
  To: Rob Herring, Lakshmi Ramasubramanian
  Cc: Mark Rutland, Bhupesh Sharma, tao.li, Mimi Zohar, Paul Mackerras,
	vincenzo.frascino, Frank Rowand, Sasha Levin, Will Deacon,
	Masahiro Yamada, James Morris, AKASHI, Takahiro,
	linux-arm-kernel, Catalin Marinas, Serge E. Hallyn, devicetree,
	Pavel Tatashin, Prakhar Srivastava, Hsin-Yi Wang, Allison Randal,
	Christophe Leroy, Matthias Brugger, balajib, dmitry.kasatkin,
	linux-kernel, James Morse, Greg Kroah-Hartman, Joe Perches,
	linux-integrity, linuxppc-dev, Thiago Jung Bauermann

Rob Herring <robh@kernel.org> writes:
> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
...
>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>> index d0e459bb2f05..51d2d8eb6c1b 100644
>> --- a/arch/powerpc/kexec/elf_64.c
>> +++ b/arch/powerpc/kexec/elf_64.c
>> @@ -19,6 +19,7 @@
>>  #include <linux/kexec.h>
>>  #include <linux/libfdt.h>
>>  #include <linux/module.h>
>> +#include <linux/of.h>
>>  #include <linux/of_fdt.h>
>>  #include <linux/slab.h>
>>  #include <linux/types.h>
>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>         unsigned int fdt_size;
>>         unsigned long kernel_load_addr;
>>         unsigned long initrd_load_addr = 0, fdt_load_addr;
>> -       void *fdt;
>> +       void *fdt = NULL;
>>         const void *slave_code;
>>         struct elfhdr ehdr;
>>         char *modified_cmdline = NULL;
>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>         }
>>
>>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>         if (!fdt) {
>>                 pr_err("Not enough memory for the device tree.\n");
>>                 ret = -ENOMEM;
>>                 goto out;
>>         }
>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>> -       if (ret < 0) {
>> -               pr_err("Error setting up the new device tree.\n");
>> -               ret = -EINVAL;
>> -               goto out;
>> -       }
>>
>>         ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
>
> The first thing this function does is call setup_new_fdt() which first
> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> PPC code split. It looks like there's a 32-bit and 64-bit split, but
> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> setup_new_fdt_ppc64()).

I think that's because 32-bit doesn't support kexec_file_load().

cheers

^ permalink raw reply	[flat|nested] 58+ messages in thread
* Re: [PATCH v16 11/12] powerpc: Use OF alloc and free for FDT
@ 2021-02-08  4:12       ` Michael Ellerman
  0 siblings, 0 replies; 58+ messages in thread
From: Michael Ellerman @ 2021-02-08  4:12 UTC (permalink / raw)
  To: Rob Herring, Lakshmi Ramasubramanian
  Cc: Mark Rutland, Benjamin Herrenschmidt, Bhupesh Sharma, tao.li,
	Mimi Zohar, Paul Mackerras, vincenzo.frascino, Frank Rowand,
	Sasha Levin, Will Deacon, Masahiro Yamada, James Morris, AKASHI,
	Takahiro, linux-arm-kernel, Catalin Marinas, Serge E. Hallyn,
	devicetree, Pavel Tatashin, Prakhar Srivastava, Hsin-Yi Wang,
	Allison Randal, Christophe Leroy, Matthias Brugger, balajib,
	dmitry.kasatkin, linux-kernel, James Morse, Greg Kroah-Hartman,
	Joe Perches, linux-integrity, linuxppc-dev,
	Thiago Jung Bauermann

Rob Herring <robh@kernel.org> writes:
> On Thu, Feb 4, 2021 at 10:42 AM Lakshmi Ramasubramanian
> <nramas@linux.microsoft.com> wrote:
...
>> diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c
>> index d0e459bb2f05..51d2d8eb6c1b 100644
>> --- a/arch/powerpc/kexec/elf_64.c
>> +++ b/arch/powerpc/kexec/elf_64.c
>> @@ -19,6 +19,7 @@
>>  #include <linux/kexec.h>
>>  #include <linux/libfdt.h>
>>  #include <linux/module.h>
>> +#include <linux/of.h>
>>  #include <linux/of_fdt.h>
>>  #include <linux/slab.h>
>>  #include <linux/types.h>
>> @@ -32,7 +33,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>         unsigned int fdt_size;
>>         unsigned long kernel_load_addr;
>>         unsigned long initrd_load_addr = 0, fdt_load_addr;
>> -       void *fdt;
>> +       void *fdt = NULL;
>>         const void *slave_code;
>>         struct elfhdr ehdr;
>>         char *modified_cmdline = NULL;
>> @@ -103,18 +104,12 @@ static void *elf64_load(struct kimage *image, char *kernel_buf,
>>         }
>>
>>         fdt_size = fdt_totalsize(initial_boot_params) * 2;
>> -       fdt = kmalloc(fdt_size, GFP_KERNEL);
>> +       fdt = of_alloc_and_init_fdt(fdt_size);
>>         if (!fdt) {
>>                 pr_err("Not enough memory for the device tree.\n");
>>                 ret = -ENOMEM;
>>                 goto out;
>>         }
>> -       ret = fdt_open_into(initial_boot_params, fdt, fdt_size);
>> -       if (ret < 0) {
>> -               pr_err("Error setting up the new device tree.\n");
>> -               ret = -EINVAL;
>> -               goto out;
>> -       }
>>
>>         ret = setup_new_fdt_ppc64(image, fdt, initrd_load_addr,
>
> The first thing this function does is call setup_new_fdt() which first
> calls of_kexec_setup_new_fdt(). (Note, I really don't understand the
> PPC code split. It looks like there's a 32-bit and 64-bit split, but
> 32-bit looks broken to me. Nothing ever calls setup_new_fdt() except
> setup_new_fdt_ppc64()).

I think that's because 32-bit doesn't support kexec_file_load().

cheers

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^ permalink raw reply	[flat|nested] 58+ messages in thread
end of thread, other threads:[~2021-02-08  4:14 UTC | newest]

Thread overview: 58+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-02-04 16:41 [PATCH v16 00/12] Carry forward IMA measurement log on kexec on ARM64 Lakshmi Ramasubramanian
2021-02-04 16:41 ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 01/12] powerpc: Rename kexec elfcorehdr_addr to elf_headers_mem Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 02/12] of: Add a common kexec FDT setup function Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-06 23:38   ` kernel test robot
2021-02-04 16:41 ` [PATCH v16 03/12] arm64: Use common of_kexec_setup_new_fdt() Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 04/12] powerpc: " Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 05/12] powerpc: Move ima buffer fields to struct kimage Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 06/12] powerpc: Move arch independent ima kexec functions to drivers/of/kexec.c Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 07/12] kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 08/12] powerpc: Delete unused function delete_fdt_mem_rsv() Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 09/12] of: Define functions to allocate and free FDT Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41 ` [PATCH v16 10/12] arm64: Use OF alloc and free functions for FDT Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 18:00   ` Will Deacon
2021-02-04 18:00     ` Will Deacon
2021-02-04 18:00     ` Will Deacon
2021-02-04 16:41 ` [PATCH v16 11/12] powerpc: Use OF alloc and free " Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 19:26   ` Rob Herring
2021-02-04 19:26     ` Rob Herring
2021-02-04 19:26     ` Rob Herring
2021-02-04 23:23     ` Lakshmi Ramasubramanian
2021-02-04 23:23       ` Lakshmi Ramasubramanian
2021-02-04 23:23       ` Lakshmi Ramasubramanian
2021-02-04 23:36       ` Rob Herring
2021-02-04 23:36         ` Rob Herring
2021-02-04 23:36         ` Rob Herring
2021-02-04 23:42         ` Lakshmi Ramasubramanian
2021-02-04 23:42           ` Lakshmi Ramasubramanian
2021-02-04 23:42           ` Lakshmi Ramasubramanian
2021-02-08  4:12     ` Michael Ellerman
2021-02-08  4:12       ` Michael Ellerman
2021-02-08  4:12       ` Michael Ellerman
2021-02-04 16:41 ` [PATCH v16 12/12] arm64: Enable passing IMA log to next kernel on kexec Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian
2021-02-04 16:41   ` Lakshmi Ramasubramanian

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