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* [PATCH v2 0/8] arm64: Relocate absolute hyp VAs
@ 2021-01-05 18:05 ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

nVHE hyp code is linked into the same kernel binary but executes under
different memory mappings. If the compiler of hyp code chooses absolute
addressing for accessing a symbol, the kernel linker will relocate that
address to a kernel image virtual address, causing a runtime exception.

So far the strategy has been to force PC-relative addressing by wrapping
all symbol references with the hyp_symbol_addr macro. This is error
prone and developer unfriendly.

The series adds a new build-time step for nVHE hyp object file where
positions targeted by R_AARCH64_ABS64 relocations are enumerated and
the information stored in a separate ELF section in the kernel image.
At runtime, the kernel first relocates all absolute addresses to their
actual virtual offset (eg. for KASLR), and then addresses listed in this
section are converted to hyp VAs.

The RFC of this series did not have a build-time step and instead relied
on filtering dynamic relocations at runtime. That approach does not work
if the kernel is built with !CONFIG_RELOCATABLE, hence an always-present
set of relocation positions was added.

The series is based on 5.11-rc2 + kvmarm/next and structured as follows:
  * patches 1-2 make sure that all sections referred to by hyp code are
    handled by the hyp linker script and prefixed with .hyp so they can
    be identified by the build-time tool
  * patches 3-5 contain the actual changes to identify and relocate VAs
  * patches 6-7 fix existing code that assumes kernel VAs
  * patch 8 removes the (now redundant) hyp_symbol_addr

The series is also available at:
  https://android-kvm.googlesource.com/linux topic/hyp-reloc_v2

Changes since v1:
  * fix for older linkers: declare hyp section symbols in hyp-reloc.S
  * fix for older host glibc: define R_AARCH64_ constants if missing
  * add generated files to .gitignore

-David

David Brazdil (8):
  KVM: arm64: Rename .idmap.text in hyp linker script
  KVM: arm64: Set up .hyp.rodata ELF section
  KVM: arm64: Add symbol at the beginning of each hyp section
  KVM: arm64: Generate hyp relocation data
  KVM: arm64: Apply hyp relocations at runtime
  KVM: arm64: Fix constant-pool users in hyp
  KVM: arm64: Remove patching of fn pointers in hyp
  KVM: arm64: Remove hyp_symbol_addr

 arch/arm64/include/asm/hyp_image.h       |  29 +-
 arch/arm64/include/asm/kvm_asm.h         |  26 --
 arch/arm64/include/asm/kvm_mmu.h         |  61 +---
 arch/arm64/include/asm/sections.h        |   3 +-
 arch/arm64/kernel/image-vars.h           |   1 -
 arch/arm64/kernel/smp.c                  |   4 +-
 arch/arm64/kernel/vmlinux.lds.S          |  18 +-
 arch/arm64/kvm/arm.c                     |   7 +-
 arch/arm64/kvm/hyp/include/hyp/switch.h  |   4 +-
 arch/arm64/kvm/hyp/nvhe/.gitignore       |   2 +
 arch/arm64/kvm/hyp/nvhe/Makefile         |  28 +-
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c     | 413 +++++++++++++++++++++++
 arch/arm64/kvm/hyp/nvhe/host.S           |  29 +-
 arch/arm64/kvm/hyp/nvhe/hyp-init.S       |   4 +-
 arch/arm64/kvm/hyp/nvhe/hyp-main.c       |  11 +-
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |   4 +-
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S        |   9 +-
 arch/arm64/kvm/hyp/nvhe/psci-relay.c     |  24 +-
 arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |   2 +-
 arch/arm64/kvm/va_layout.c               |  34 +-
 20 files changed, 578 insertions(+), 135 deletions(-)
 create mode 100644 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c

--
2.29.2.729.g45daf8777d-goog

^ permalink raw reply	[flat|nested] 57+ messages in thread
* [PATCH v2 0/8] arm64: Relocate absolute hyp VAs
@ 2021-01-05 18:05 ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

nVHE hyp code is linked into the same kernel binary but executes under
different memory mappings. If the compiler of hyp code chooses absolute
addressing for accessing a symbol, the kernel linker will relocate that
address to a kernel image virtual address, causing a runtime exception.

So far the strategy has been to force PC-relative addressing by wrapping
all symbol references with the hyp_symbol_addr macro. This is error
prone and developer unfriendly.

The series adds a new build-time step for nVHE hyp object file where
positions targeted by R_AARCH64_ABS64 relocations are enumerated and
the information stored in a separate ELF section in the kernel image.
At runtime, the kernel first relocates all absolute addresses to their
actual virtual offset (eg. for KASLR), and then addresses listed in this
section are converted to hyp VAs.

The RFC of this series did not have a build-time step and instead relied
on filtering dynamic relocations at runtime. That approach does not work
if the kernel is built with !CONFIG_RELOCATABLE, hence an always-present
set of relocation positions was added.

The series is based on 5.11-rc2 + kvmarm/next and structured as follows:
  * patches 1-2 make sure that all sections referred to by hyp code are
    handled by the hyp linker script and prefixed with .hyp so they can
    be identified by the build-time tool
  * patches 3-5 contain the actual changes to identify and relocate VAs
  * patches 6-7 fix existing code that assumes kernel VAs
  * patch 8 removes the (now redundant) hyp_symbol_addr

The series is also available at:
  https://android-kvm.googlesource.com/linux topic/hyp-reloc_v2

Changes since v1:
  * fix for older linkers: declare hyp section symbols in hyp-reloc.S
  * fix for older host glibc: define R_AARCH64_ constants if missing
  * add generated files to .gitignore

-David

David Brazdil (8):
  KVM: arm64: Rename .idmap.text in hyp linker script
  KVM: arm64: Set up .hyp.rodata ELF section
  KVM: arm64: Add symbol at the beginning of each hyp section
  KVM: arm64: Generate hyp relocation data
  KVM: arm64: Apply hyp relocations at runtime
  KVM: arm64: Fix constant-pool users in hyp
  KVM: arm64: Remove patching of fn pointers in hyp
  KVM: arm64: Remove hyp_symbol_addr

 arch/arm64/include/asm/hyp_image.h       |  29 +-
 arch/arm64/include/asm/kvm_asm.h         |  26 --
 arch/arm64/include/asm/kvm_mmu.h         |  61 +---
 arch/arm64/include/asm/sections.h        |   3 +-
 arch/arm64/kernel/image-vars.h           |   1 -
 arch/arm64/kernel/smp.c                  |   4 +-
 arch/arm64/kernel/vmlinux.lds.S          |  18 +-
 arch/arm64/kvm/arm.c                     |   7 +-
 arch/arm64/kvm/hyp/include/hyp/switch.h  |   4 +-
 arch/arm64/kvm/hyp/nvhe/.gitignore       |   2 +
 arch/arm64/kvm/hyp/nvhe/Makefile         |  28 +-
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c     | 413 +++++++++++++++++++++++
 arch/arm64/kvm/hyp/nvhe/host.S           |  29 +-
 arch/arm64/kvm/hyp/nvhe/hyp-init.S       |   4 +-
 arch/arm64/kvm/hyp/nvhe/hyp-main.c       |  11 +-
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |   4 +-
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S        |   9 +-
 arch/arm64/kvm/hyp/nvhe/psci-relay.c     |  24 +-
 arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |   2 +-
 arch/arm64/kvm/va_layout.c               |  34 +-
 20 files changed, 578 insertions(+), 135 deletions(-)
 create mode 100644 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c

--
2.29.2.729.g45daf8777d-goog
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* [PATCH v2 0/8] arm64: Relocate absolute hyp VAs
@ 2021-01-05 18:05 ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

nVHE hyp code is linked into the same kernel binary but executes under
different memory mappings. If the compiler of hyp code chooses absolute
addressing for accessing a symbol, the kernel linker will relocate that
address to a kernel image virtual address, causing a runtime exception.

So far the strategy has been to force PC-relative addressing by wrapping
all symbol references with the hyp_symbol_addr macro. This is error
prone and developer unfriendly.

The series adds a new build-time step for nVHE hyp object file where
positions targeted by R_AARCH64_ABS64 relocations are enumerated and
the information stored in a separate ELF section in the kernel image.
At runtime, the kernel first relocates all absolute addresses to their
actual virtual offset (eg. for KASLR), and then addresses listed in this
section are converted to hyp VAs.

The RFC of this series did not have a build-time step and instead relied
on filtering dynamic relocations at runtime. That approach does not work
if the kernel is built with !CONFIG_RELOCATABLE, hence an always-present
set of relocation positions was added.

The series is based on 5.11-rc2 + kvmarm/next and structured as follows:
  * patches 1-2 make sure that all sections referred to by hyp code are
    handled by the hyp linker script and prefixed with .hyp so they can
    be identified by the build-time tool
  * patches 3-5 contain the actual changes to identify and relocate VAs
  * patches 6-7 fix existing code that assumes kernel VAs
  * patch 8 removes the (now redundant) hyp_symbol_addr

The series is also available at:
  https://android-kvm.googlesource.com/linux topic/hyp-reloc_v2

Changes since v1:
  * fix for older linkers: declare hyp section symbols in hyp-reloc.S
  * fix for older host glibc: define R_AARCH64_ constants if missing
  * add generated files to .gitignore

-David

David Brazdil (8):
  KVM: arm64: Rename .idmap.text in hyp linker script
  KVM: arm64: Set up .hyp.rodata ELF section
  KVM: arm64: Add symbol at the beginning of each hyp section
  KVM: arm64: Generate hyp relocation data
  KVM: arm64: Apply hyp relocations at runtime
  KVM: arm64: Fix constant-pool users in hyp
  KVM: arm64: Remove patching of fn pointers in hyp
  KVM: arm64: Remove hyp_symbol_addr

 arch/arm64/include/asm/hyp_image.h       |  29 +-
 arch/arm64/include/asm/kvm_asm.h         |  26 --
 arch/arm64/include/asm/kvm_mmu.h         |  61 +---
 arch/arm64/include/asm/sections.h        |   3 +-
 arch/arm64/kernel/image-vars.h           |   1 -
 arch/arm64/kernel/smp.c                  |   4 +-
 arch/arm64/kernel/vmlinux.lds.S          |  18 +-
 arch/arm64/kvm/arm.c                     |   7 +-
 arch/arm64/kvm/hyp/include/hyp/switch.h  |   4 +-
 arch/arm64/kvm/hyp/nvhe/.gitignore       |   2 +
 arch/arm64/kvm/hyp/nvhe/Makefile         |  28 +-
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c     | 413 +++++++++++++++++++++++
 arch/arm64/kvm/hyp/nvhe/host.S           |  29 +-
 arch/arm64/kvm/hyp/nvhe/hyp-init.S       |   4 +-
 arch/arm64/kvm/hyp/nvhe/hyp-main.c       |  11 +-
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |   4 +-
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S        |   9 +-
 arch/arm64/kvm/hyp/nvhe/psci-relay.c     |  24 +-
 arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |   2 +-
 arch/arm64/kvm/va_layout.c               |  34 +-
 20 files changed, 578 insertions(+), 135 deletions(-)
 create mode 100644 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c

--
2.29.2.729.g45daf8777d-goog

_______________________________________________
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] 57+ messages in thread
* [PATCH v2 1/8] KVM: arm64: Rename .idmap.text in hyp linker script
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-05 18:05   ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

So far hyp-init.S created a .hyp.idmap.text section directly, without
relying on the hyp linker script to prefix its name. Change it to create
.idmap.text and add a HYP_SECTION entry to hyp.lds.S. This way all .hyp*
sections go through the linker script and can be instrumented there.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/kvm/hyp/nvhe/hyp-init.S | 2 +-
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
index 31b060a44045..68fd64f2313e 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -18,7 +18,7 @@
 #include <asm/virt.h>
 
 	.text
-	.pushsection	.hyp.idmap.text, "ax"
+	.pushsection	.idmap.text, "ax"
 
 	.align	11
 
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index 1206d0d754d5..70ac48ccede7 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -12,6 +12,7 @@
 #include <asm/memory.h>
 
 SECTIONS {
+	HYP_SECTION(.idmap.text)
 	HYP_SECTION(.text)
 	/*
 	 * .hyp..data..percpu needs to be page aligned to maintain the same
-- 
2.29.2.729.g45daf8777d-goog


^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 1/8] KVM: arm64: Rename .idmap.text in hyp linker script
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

So far hyp-init.S created a .hyp.idmap.text section directly, without
relying on the hyp linker script to prefix its name. Change it to create
.idmap.text and add a HYP_SECTION entry to hyp.lds.S. This way all .hyp*
sections go through the linker script and can be instrumented there.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/kvm/hyp/nvhe/hyp-init.S | 2 +-
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
index 31b060a44045..68fd64f2313e 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -18,7 +18,7 @@
 #include <asm/virt.h>
 
 	.text
-	.pushsection	.hyp.idmap.text, "ax"
+	.pushsection	.idmap.text, "ax"
 
 	.align	11
 
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index 1206d0d754d5..70ac48ccede7 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -12,6 +12,7 @@
 #include <asm/memory.h>
 
 SECTIONS {
+	HYP_SECTION(.idmap.text)
 	HYP_SECTION(.text)
 	/*
 	 * .hyp..data..percpu needs to be page aligned to maintain the same
-- 
2.29.2.729.g45daf8777d-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 1/8] KVM: arm64: Rename .idmap.text in hyp linker script
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

So far hyp-init.S created a .hyp.idmap.text section directly, without
relying on the hyp linker script to prefix its name. Change it to create
.idmap.text and add a HYP_SECTION entry to hyp.lds.S. This way all .hyp*
sections go through the linker script and can be instrumented there.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/kvm/hyp/nvhe/hyp-init.S | 2 +-
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
index 31b060a44045..68fd64f2313e 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -18,7 +18,7 @@
 #include <asm/virt.h>
 
 	.text
-	.pushsection	.hyp.idmap.text, "ax"
+	.pushsection	.idmap.text, "ax"
 
 	.align	11
 
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index 1206d0d754d5..70ac48ccede7 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -12,6 +12,7 @@
 #include <asm/memory.h>
 
 SECTIONS {
+	HYP_SECTION(.idmap.text)
 	HYP_SECTION(.text)
 	/*
 	 * .hyp..data..percpu needs to be page aligned to maintain the same
-- 
2.29.2.729.g45daf8777d-goog


_______________________________________________
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] 57+ messages in thread
* [PATCH v2 2/8] KVM: arm64: Set up .hyp.rodata ELF section
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-05 18:05   ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

We will need to recognize pointers in .rodata specific to hyp, so
establish a .hyp.rodata ELF section. Merge it with the existing
.hyp.data..ro_after_init as they are treated the same at runtime.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/sections.h | 2 +-
 arch/arm64/kernel/vmlinux.lds.S   | 7 ++++---
 arch/arm64/kvm/arm.c              | 7 +++----
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 4 +++-
 4 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/include/asm/sections.h b/arch/arm64/include/asm/sections.h
index 8ff579361731..a6f3557d1ab2 100644
--- a/arch/arm64/include/asm/sections.h
+++ b/arch/arm64/include/asm/sections.h
@@ -11,7 +11,7 @@ extern char __alt_instructions[], __alt_instructions_end[];
 extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[];
 extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
 extern char __hyp_text_start[], __hyp_text_end[];
-extern char __hyp_data_ro_after_init_start[], __hyp_data_ro_after_init_end[];
+extern char __hyp_rodata_start[], __hyp_rodata_end[];
 extern char __idmap_text_start[], __idmap_text_end[];
 extern char __initdata_begin[], __initdata_end[];
 extern char __inittext_begin[], __inittext_end[];
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 4c0b0c89ad59..9672b54bba7c 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -31,10 +31,11 @@ jiffies = jiffies_64;
 	__stop___kvm_ex_table = .;
 
 #define HYPERVISOR_DATA_SECTIONS				\
-	HYP_SECTION_NAME(.data..ro_after_init) : {		\
-		__hyp_data_ro_after_init_start = .;		\
+	HYP_SECTION_NAME(.rodata) : {				\
+		__hyp_rodata_start = .;				\
 		*(HYP_SECTION_NAME(.data..ro_after_init))	\
-		__hyp_data_ro_after_init_end = .;		\
+		*(HYP_SECTION_NAME(.rodata))			\
+		__hyp_rodata_end = .;				\
 	}
 
 #define HYPERVISOR_PERCPU_SECTION				\
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 04c44853b103..de1af4052780 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1749,11 +1749,10 @@ static int init_hyp_mode(void)
 		goto out_err;
 	}
 
-	err = create_hyp_mappings(kvm_ksym_ref(__hyp_data_ro_after_init_start),
-				  kvm_ksym_ref(__hyp_data_ro_after_init_end),
-				  PAGE_HYP_RO);
+	err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start),
+				  kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO);
 	if (err) {
-		kvm_err("Cannot map .hyp.data..ro_after_init section\n");
+		kvm_err("Cannot map .hyp.rodata section\n");
 		goto out_err;
 	}
 
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index 70ac48ccede7..cfdc59b4329b 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -14,6 +14,9 @@
 SECTIONS {
 	HYP_SECTION(.idmap.text)
 	HYP_SECTION(.text)
+	HYP_SECTION(.data..ro_after_init)
+	HYP_SECTION(.rodata)
+
 	/*
 	 * .hyp..data..percpu needs to be page aligned to maintain the same
 	 * alignment for when linking into vmlinux.
@@ -22,5 +25,4 @@ SECTIONS {
 	HYP_SECTION_NAME(.data..percpu) : {
 		PERCPU_INPUT(L1_CACHE_BYTES)
 	}
-	HYP_SECTION(.data..ro_after_init)
 }
-- 
2.29.2.729.g45daf8777d-goog


^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 2/8] KVM: arm64: Set up .hyp.rodata ELF section
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

We will need to recognize pointers in .rodata specific to hyp, so
establish a .hyp.rodata ELF section. Merge it with the existing
.hyp.data..ro_after_init as they are treated the same at runtime.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/sections.h | 2 +-
 arch/arm64/kernel/vmlinux.lds.S   | 7 ++++---
 arch/arm64/kvm/arm.c              | 7 +++----
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 4 +++-
 4 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/include/asm/sections.h b/arch/arm64/include/asm/sections.h
index 8ff579361731..a6f3557d1ab2 100644
--- a/arch/arm64/include/asm/sections.h
+++ b/arch/arm64/include/asm/sections.h
@@ -11,7 +11,7 @@ extern char __alt_instructions[], __alt_instructions_end[];
 extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[];
 extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
 extern char __hyp_text_start[], __hyp_text_end[];
-extern char __hyp_data_ro_after_init_start[], __hyp_data_ro_after_init_end[];
+extern char __hyp_rodata_start[], __hyp_rodata_end[];
 extern char __idmap_text_start[], __idmap_text_end[];
 extern char __initdata_begin[], __initdata_end[];
 extern char __inittext_begin[], __inittext_end[];
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 4c0b0c89ad59..9672b54bba7c 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -31,10 +31,11 @@ jiffies = jiffies_64;
 	__stop___kvm_ex_table = .;
 
 #define HYPERVISOR_DATA_SECTIONS				\
-	HYP_SECTION_NAME(.data..ro_after_init) : {		\
-		__hyp_data_ro_after_init_start = .;		\
+	HYP_SECTION_NAME(.rodata) : {				\
+		__hyp_rodata_start = .;				\
 		*(HYP_SECTION_NAME(.data..ro_after_init))	\
-		__hyp_data_ro_after_init_end = .;		\
+		*(HYP_SECTION_NAME(.rodata))			\
+		__hyp_rodata_end = .;				\
 	}
 
 #define HYPERVISOR_PERCPU_SECTION				\
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 04c44853b103..de1af4052780 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1749,11 +1749,10 @@ static int init_hyp_mode(void)
 		goto out_err;
 	}
 
-	err = create_hyp_mappings(kvm_ksym_ref(__hyp_data_ro_after_init_start),
-				  kvm_ksym_ref(__hyp_data_ro_after_init_end),
-				  PAGE_HYP_RO);
+	err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start),
+				  kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO);
 	if (err) {
-		kvm_err("Cannot map .hyp.data..ro_after_init section\n");
+		kvm_err("Cannot map .hyp.rodata section\n");
 		goto out_err;
 	}
 
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index 70ac48ccede7..cfdc59b4329b 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -14,6 +14,9 @@
 SECTIONS {
 	HYP_SECTION(.idmap.text)
 	HYP_SECTION(.text)
+	HYP_SECTION(.data..ro_after_init)
+	HYP_SECTION(.rodata)
+
 	/*
 	 * .hyp..data..percpu needs to be page aligned to maintain the same
 	 * alignment for when linking into vmlinux.
@@ -22,5 +25,4 @@ SECTIONS {
 	HYP_SECTION_NAME(.data..percpu) : {
 		PERCPU_INPUT(L1_CACHE_BYTES)
 	}
-	HYP_SECTION(.data..ro_after_init)
 }
-- 
2.29.2.729.g45daf8777d-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 2/8] KVM: arm64: Set up .hyp.rodata ELF section
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

We will need to recognize pointers in .rodata specific to hyp, so
establish a .hyp.rodata ELF section. Merge it with the existing
.hyp.data..ro_after_init as they are treated the same at runtime.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/sections.h | 2 +-
 arch/arm64/kernel/vmlinux.lds.S   | 7 ++++---
 arch/arm64/kvm/arm.c              | 7 +++----
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S | 4 +++-
 4 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/include/asm/sections.h b/arch/arm64/include/asm/sections.h
index 8ff579361731..a6f3557d1ab2 100644
--- a/arch/arm64/include/asm/sections.h
+++ b/arch/arm64/include/asm/sections.h
@@ -11,7 +11,7 @@ extern char __alt_instructions[], __alt_instructions_end[];
 extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[];
 extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
 extern char __hyp_text_start[], __hyp_text_end[];
-extern char __hyp_data_ro_after_init_start[], __hyp_data_ro_after_init_end[];
+extern char __hyp_rodata_start[], __hyp_rodata_end[];
 extern char __idmap_text_start[], __idmap_text_end[];
 extern char __initdata_begin[], __initdata_end[];
 extern char __inittext_begin[], __inittext_end[];
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 4c0b0c89ad59..9672b54bba7c 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -31,10 +31,11 @@ jiffies = jiffies_64;
 	__stop___kvm_ex_table = .;
 
 #define HYPERVISOR_DATA_SECTIONS				\
-	HYP_SECTION_NAME(.data..ro_after_init) : {		\
-		__hyp_data_ro_after_init_start = .;		\
+	HYP_SECTION_NAME(.rodata) : {				\
+		__hyp_rodata_start = .;				\
 		*(HYP_SECTION_NAME(.data..ro_after_init))	\
-		__hyp_data_ro_after_init_end = .;		\
+		*(HYP_SECTION_NAME(.rodata))			\
+		__hyp_rodata_end = .;				\
 	}
 
 #define HYPERVISOR_PERCPU_SECTION				\
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 04c44853b103..de1af4052780 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1749,11 +1749,10 @@ static int init_hyp_mode(void)
 		goto out_err;
 	}
 
-	err = create_hyp_mappings(kvm_ksym_ref(__hyp_data_ro_after_init_start),
-				  kvm_ksym_ref(__hyp_data_ro_after_init_end),
-				  PAGE_HYP_RO);
+	err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start),
+				  kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO);
 	if (err) {
-		kvm_err("Cannot map .hyp.data..ro_after_init section\n");
+		kvm_err("Cannot map .hyp.rodata section\n");
 		goto out_err;
 	}
 
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index 70ac48ccede7..cfdc59b4329b 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -14,6 +14,9 @@
 SECTIONS {
 	HYP_SECTION(.idmap.text)
 	HYP_SECTION(.text)
+	HYP_SECTION(.data..ro_after_init)
+	HYP_SECTION(.rodata)
+
 	/*
 	 * .hyp..data..percpu needs to be page aligned to maintain the same
 	 * alignment for when linking into vmlinux.
@@ -22,5 +25,4 @@ SECTIONS {
 	HYP_SECTION_NAME(.data..percpu) : {
 		PERCPU_INPUT(L1_CACHE_BYTES)
 	}
-	HYP_SECTION(.data..ro_after_init)
 }
-- 
2.29.2.729.g45daf8777d-goog


_______________________________________________
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] 57+ messages in thread
* [PATCH v2 3/8] KVM: arm64: Add symbol at the beginning of each hyp section
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-05 18:05   ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

Generating hyp relocations will require referencing positions at a given
offset from the beginning of hyp sections. Since the final layout will
not be determined until the linking of `vmlinux`, modify the hyp linker
script to insert a symbol at the first byte of each hyp section to use
as an anchor. The linker of `vmlinux` will place the symbols together
with the sections.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/hyp_image.h | 29 +++++++++++++++++++++++++++--
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S  |  4 ++--
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/hyp_image.h b/arch/arm64/include/asm/hyp_image.h
index daa1a1da539e..f97b774b58f4 100644
--- a/arch/arm64/include/asm/hyp_image.h
+++ b/arch/arm64/include/asm/hyp_image.h
@@ -7,6 +7,9 @@
 #ifndef __ARM64_HYP_IMAGE_H__
 #define __ARM64_HYP_IMAGE_H__
 
+#define HYP_CONCAT(a, b)	__HYP_CONCAT(a, b)
+#define __HYP_CONCAT(a, b)	a ## b
+
 /*
  * KVM nVHE code has its own symbol namespace prefixed with __kvm_nvhe_,
  * to separate it from the kernel proper.
@@ -21,9 +24,31 @@
  */
 #define HYP_SECTION_NAME(NAME)	.hyp##NAME
 
+/* Symbol defined at the beginning of each hyp section. */
+#define HYP_SECTION_SYMBOL_NAME(NAME) \
+	HYP_CONCAT(__hyp_section_, HYP_SECTION_NAME(NAME))
+
+/*
+ * Helper to generate linker script statements starting a hyp section.
+ *
+ * A symbol with a well-known name is defined at the first byte. This
+ * is used as a base for hyp relocations (see gen-hyprel.c). It must
+ * be defined inside the section so the linker of `vmlinux` cannot
+ * separate it from the section data.
+ */
+#define BEGIN_HYP_SECTION(NAME)				\
+	HYP_SECTION_NAME(NAME) : {			\
+		HYP_SECTION_SYMBOL_NAME(NAME) = .;
+
+/* Helper to generate linker script statements ending a hyp section. */
+#define END_HYP_SECTION					\
+	}
+
 /* Defines an ELF hyp section from input section @NAME and its subsections. */
-#define HYP_SECTION(NAME) \
-	HYP_SECTION_NAME(NAME) : { *(NAME NAME##.*) }
+#define HYP_SECTION(NAME)			\
+	BEGIN_HYP_SECTION(NAME)			\
+		*(NAME NAME##.*)		\
+	END_HYP_SECTION
 
 /*
  * Defines a linker script alias of a kernel-proper symbol referenced by
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index cfdc59b4329b..cd119d82d8e3 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -22,7 +22,7 @@ SECTIONS {
 	 * alignment for when linking into vmlinux.
 	 */
 	. = ALIGN(PAGE_SIZE);
-	HYP_SECTION_NAME(.data..percpu) : {
+	BEGIN_HYP_SECTION(.data..percpu)
 		PERCPU_INPUT(L1_CACHE_BYTES)
-	}
+	END_HYP_SECTION
 }
-- 
2.29.2.729.g45daf8777d-goog


^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 3/8] KVM: arm64: Add symbol at the beginning of each hyp section
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

Generating hyp relocations will require referencing positions at a given
offset from the beginning of hyp sections. Since the final layout will
not be determined until the linking of `vmlinux`, modify the hyp linker
script to insert a symbol at the first byte of each hyp section to use
as an anchor. The linker of `vmlinux` will place the symbols together
with the sections.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/hyp_image.h | 29 +++++++++++++++++++++++++++--
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S  |  4 ++--
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/hyp_image.h b/arch/arm64/include/asm/hyp_image.h
index daa1a1da539e..f97b774b58f4 100644
--- a/arch/arm64/include/asm/hyp_image.h
+++ b/arch/arm64/include/asm/hyp_image.h
@@ -7,6 +7,9 @@
 #ifndef __ARM64_HYP_IMAGE_H__
 #define __ARM64_HYP_IMAGE_H__
 
+#define HYP_CONCAT(a, b)	__HYP_CONCAT(a, b)
+#define __HYP_CONCAT(a, b)	a ## b
+
 /*
  * KVM nVHE code has its own symbol namespace prefixed with __kvm_nvhe_,
  * to separate it from the kernel proper.
@@ -21,9 +24,31 @@
  */
 #define HYP_SECTION_NAME(NAME)	.hyp##NAME
 
+/* Symbol defined at the beginning of each hyp section. */
+#define HYP_SECTION_SYMBOL_NAME(NAME) \
+	HYP_CONCAT(__hyp_section_, HYP_SECTION_NAME(NAME))
+
+/*
+ * Helper to generate linker script statements starting a hyp section.
+ *
+ * A symbol with a well-known name is defined at the first byte. This
+ * is used as a base for hyp relocations (see gen-hyprel.c). It must
+ * be defined inside the section so the linker of `vmlinux` cannot
+ * separate it from the section data.
+ */
+#define BEGIN_HYP_SECTION(NAME)				\
+	HYP_SECTION_NAME(NAME) : {			\
+		HYP_SECTION_SYMBOL_NAME(NAME) = .;
+
+/* Helper to generate linker script statements ending a hyp section. */
+#define END_HYP_SECTION					\
+	}
+
 /* Defines an ELF hyp section from input section @NAME and its subsections. */
-#define HYP_SECTION(NAME) \
-	HYP_SECTION_NAME(NAME) : { *(NAME NAME##.*) }
+#define HYP_SECTION(NAME)			\
+	BEGIN_HYP_SECTION(NAME)			\
+		*(NAME NAME##.*)		\
+	END_HYP_SECTION
 
 /*
  * Defines a linker script alias of a kernel-proper symbol referenced by
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index cfdc59b4329b..cd119d82d8e3 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -22,7 +22,7 @@ SECTIONS {
 	 * alignment for when linking into vmlinux.
 	 */
 	. = ALIGN(PAGE_SIZE);
-	HYP_SECTION_NAME(.data..percpu) : {
+	BEGIN_HYP_SECTION(.data..percpu)
 		PERCPU_INPUT(L1_CACHE_BYTES)
-	}
+	END_HYP_SECTION
 }
-- 
2.29.2.729.g45daf8777d-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 3/8] KVM: arm64: Add symbol at the beginning of each hyp section
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Generating hyp relocations will require referencing positions at a given
offset from the beginning of hyp sections. Since the final layout will
not be determined until the linking of `vmlinux`, modify the hyp linker
script to insert a symbol at the first byte of each hyp section to use
as an anchor. The linker of `vmlinux` will place the symbols together
with the sections.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/hyp_image.h | 29 +++++++++++++++++++++++++++--
 arch/arm64/kvm/hyp/nvhe/hyp.lds.S  |  4 ++--
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/hyp_image.h b/arch/arm64/include/asm/hyp_image.h
index daa1a1da539e..f97b774b58f4 100644
--- a/arch/arm64/include/asm/hyp_image.h
+++ b/arch/arm64/include/asm/hyp_image.h
@@ -7,6 +7,9 @@
 #ifndef __ARM64_HYP_IMAGE_H__
 #define __ARM64_HYP_IMAGE_H__
 
+#define HYP_CONCAT(a, b)	__HYP_CONCAT(a, b)
+#define __HYP_CONCAT(a, b)	a ## b
+
 /*
  * KVM nVHE code has its own symbol namespace prefixed with __kvm_nvhe_,
  * to separate it from the kernel proper.
@@ -21,9 +24,31 @@
  */
 #define HYP_SECTION_NAME(NAME)	.hyp##NAME
 
+/* Symbol defined at the beginning of each hyp section. */
+#define HYP_SECTION_SYMBOL_NAME(NAME) \
+	HYP_CONCAT(__hyp_section_, HYP_SECTION_NAME(NAME))
+
+/*
+ * Helper to generate linker script statements starting a hyp section.
+ *
+ * A symbol with a well-known name is defined at the first byte. This
+ * is used as a base for hyp relocations (see gen-hyprel.c). It must
+ * be defined inside the section so the linker of `vmlinux` cannot
+ * separate it from the section data.
+ */
+#define BEGIN_HYP_SECTION(NAME)				\
+	HYP_SECTION_NAME(NAME) : {			\
+		HYP_SECTION_SYMBOL_NAME(NAME) = .;
+
+/* Helper to generate linker script statements ending a hyp section. */
+#define END_HYP_SECTION					\
+	}
+
 /* Defines an ELF hyp section from input section @NAME and its subsections. */
-#define HYP_SECTION(NAME) \
-	HYP_SECTION_NAME(NAME) : { *(NAME NAME##.*) }
+#define HYP_SECTION(NAME)			\
+	BEGIN_HYP_SECTION(NAME)			\
+		*(NAME NAME##.*)		\
+	END_HYP_SECTION
 
 /*
  * Defines a linker script alias of a kernel-proper symbol referenced by
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
index cfdc59b4329b..cd119d82d8e3 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp.lds.S
@@ -22,7 +22,7 @@ SECTIONS {
 	 * alignment for when linking into vmlinux.
 	 */
 	. = ALIGN(PAGE_SIZE);
-	HYP_SECTION_NAME(.data..percpu) : {
+	BEGIN_HYP_SECTION(.data..percpu)
 		PERCPU_INPUT(L1_CACHE_BYTES)
-	}
+	END_HYP_SECTION
 }
-- 
2.29.2.729.g45daf8777d-goog


_______________________________________________
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] 57+ messages in thread
* [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-05 18:05   ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

Add a post-processing step to compilation of KVM nVHE hyp code which
calls a custom host tool (gen-hyprel) on the partially linked object
file (hyp sections' names prefixed).

The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
sections and generates an assembly file that will form a new section
.hyp.reloc in the kernel binary. The new section contains an array of
32-bit offsets to the positions targeted by these relocations.

Since these addresses of those positions will not be determined until
linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
relocation with addend <section_base_sym> + <r_offset>. The linker of
`vmlinux` will therefore fill the slot accordingly.

This relocation data will be used at runtime to convert the kernel VAs
at those positions to hyp VAs.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/kernel/vmlinux.lds.S      |  11 +
 arch/arm64/kvm/hyp/nvhe/.gitignore   |   2 +
 arch/arm64/kvm/hyp/nvhe/Makefile     |  28 +-
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 413 +++++++++++++++++++++++++++
 4 files changed, 451 insertions(+), 3 deletions(-)
 create mode 100644 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 9672b54bba7c..636ca45aa1d4 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -43,10 +43,19 @@ jiffies = jiffies_64;
 	HYP_SECTION_NAME(.data..percpu) : {			\
 		*(HYP_SECTION_NAME(.data..percpu))		\
 	}
+
+#define HYPERVISOR_RELOC_SECTION				\
+	.hyp.reloc : ALIGN(4) {					\
+		__hyp_reloc_begin = .;				\
+		*(.hyp.reloc)					\
+		__hyp_reloc_end = .;				\
+	}
+
 #else /* CONFIG_KVM */
 #define HYPERVISOR_EXTABLE
 #define HYPERVISOR_DATA_SECTIONS
 #define HYPERVISOR_PERCPU_SECTION
+#define HYPERVISOR_RELOC_SECTION
 #endif
 
 #define HYPERVISOR_TEXT					\
@@ -217,6 +226,8 @@ SECTIONS
 	PERCPU_SECTION(L1_CACHE_BYTES)
 	HYPERVISOR_PERCPU_SECTION
 
+	HYPERVISOR_RELOC_SECTION
+
 	.rela.dyn : ALIGN(8) {
 		*(.rela .rela*)
 	}
diff --git a/arch/arm64/kvm/hyp/nvhe/.gitignore b/arch/arm64/kvm/hyp/nvhe/.gitignore
index 695d73d0249e..5b6c43cc96f8 100644
--- a/arch/arm64/kvm/hyp/nvhe/.gitignore
+++ b/arch/arm64/kvm/hyp/nvhe/.gitignore
@@ -1,2 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
+gen-hyprel
 hyp.lds
+hyp-reloc.S
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 1f1e351c5fe2..268be1376f74 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -6,6 +6,8 @@
 asflags-y := -D__KVM_NVHE_HYPERVISOR__
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__
 
+hostprogs := gen-hyprel
+
 obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
 	 hyp-main.o hyp-smp.o psci-relay.o
 obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
@@ -19,7 +21,7 @@ obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
 
 hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y))
 obj-y := kvm_nvhe.o
-extra-y := $(hyp-obj) kvm_nvhe.tmp.o hyp.lds
+extra-y := $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o
 
 # 1) Compile all source files to `.nvhe.o` object files. The file extension
 #    avoids file name clashes for files shared with VHE.
@@ -42,11 +44,31 @@ LDFLAGS_kvm_nvhe.tmp.o := -r -T
 $(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE
 	$(call if_changed,ld)
 
-# 4) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
+# 4) Generate list of hyp code/data positions that need to be relocated at
+#    runtime. Because the hypervisor is part of the kernel binary, relocations
+#    produce a kernel VA. We enumerate relocations targeting hyp at build time
+#    and convert the kernel VAs at those positions to hyp VAs.
+$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel
+	$(call if_changed,hyprel)
+
+# 5) Compile hyp-reloc.S and link it into the existing partially linked object.
+#    The object file now contains a section with pointers to hyp positions that
+#    will contain kernel VAs at runtime. These pointers have relocations on them
+#    so that they get updated as the hyp object is linked into `vmlinux`.
+LDFLAGS_kvm_nvhe.rel.o := -r
+$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE
+	$(call if_changed,ld)
+
+# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
 #    Prefixes names of ELF symbols with '__kvm_nvhe_'.
-$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.tmp.o FORCE
+$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE
 	$(call if_changed,hypcopy)
 
+# The HYPREL command calls `gen-hyprel` to generate an assembly file with
+# a list of relocations targeting hyp code/data.
+quiet_cmd_hyprel = HYPREL  $@
+      cmd_hyprel = $(obj)/gen-hyprel $< > $@
+
 # The HYPCOPY command uses `objcopy` to prefix all ELF symbol names
 # to avoid clashes with VHE code/data.
 quiet_cmd_hypcopy = HYPCOPY $@
diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
new file mode 100644
index 000000000000..58fe31fdba8e
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
@@ -0,0 +1,413 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: David Brazdil <dbrazdil@google.com>
+ *
+ * Generates relocation information used by the kernel to convert
+ * absolute addresses in hyp data from kernel VAs to hyp VAs.
+ *
+ * This is necessary because hyp code is linked into the same binary
+ * as the kernel but executes under different memory mappings.
+ * If the compiler used absolute addressing, those addresses need to
+ * be converted before they are used by hyp code.
+ *
+ * The input of this program is the relocatable ELF object containing
+ * all hyp code/data, not yet linked into vmlinux. Hyp section names
+ * should have been prefixed with `.hyp` at this point.
+ *
+ * The output (printed to stdout) is an assembly file containing
+ * an array of 32-bit integers and static relocations that instruct
+ * the linker of `vmlinux` to populate the array entries with offsets
+ * to positions in the kernel binary containing VAs used by hyp code.
+ *
+ * Note that dynamic relocations could be used for the same purpose.
+ * However, those are only generated if CONFIG_RELOCATABLE=y.
+ */
+
+#include <elf.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define HYP_SECTION_PREFIX		".hyp"
+#define HYP_RELOC_SECTION		".hyp.reloc"
+#define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
+
+/*
+ * AArch64 relocation type constants.
+ * Included in case these are not defined in the host toolchain.
+ */
+#ifndef R_AARCH64_ABS64
+#define R_AARCH64_ABS64			257
+#endif
+#ifndef R_AARCH64_LD_PREL_LO19
+#define R_AARCH64_LD_PREL_LO19		273
+#endif
+#ifndef R_AARCH64_ADR_PREL_LO21
+#define R_AARCH64_ADR_PREL_LO21		274
+#endif
+#ifndef R_AARCH64_ADR_PREL_PG_HI21
+#define R_AARCH64_ADR_PREL_PG_HI21	275
+#endif
+#ifndef R_AARCH64_ADR_PREL_PG_HI21_NC
+#define R_AARCH64_ADR_PREL_PG_HI21_NC	276
+#endif
+#ifndef R_AARCH64_ADD_ABS_LO12_NC
+#define R_AARCH64_ADD_ABS_LO12_NC	277
+#endif
+#ifndef R_AARCH64_LDST8_ABS_LO12_NC
+#define R_AARCH64_LDST8_ABS_LO12_NC	278
+#endif
+#ifndef R_AARCH64_TSTBR14
+#define R_AARCH64_TSTBR14		279
+#endif
+#ifndef R_AARCH64_CONDBR19
+#define R_AARCH64_CONDBR19		280
+#endif
+#ifndef R_AARCH64_JUMP26
+#define R_AARCH64_JUMP26		282
+#endif
+#ifndef R_AARCH64_CALL26
+#define R_AARCH64_CALL26		283
+#endif
+#ifndef R_AARCH64_LDST16_ABS_LO12_NC
+#define R_AARCH64_LDST16_ABS_LO12_NC	284
+#endif
+#ifndef R_AARCH64_LDST32_ABS_LO12_NC
+#define R_AARCH64_LDST32_ABS_LO12_NC	285
+#endif
+#ifndef R_AARCH64_LDST64_ABS_LO12_NC
+#define R_AARCH64_LDST64_ABS_LO12_NC	286
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G0
+#define R_AARCH64_MOVW_PREL_G0		287
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G0_NC
+#define R_AARCH64_MOVW_PREL_G0_NC	288
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G1
+#define R_AARCH64_MOVW_PREL_G1		289
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G1_NC
+#define R_AARCH64_MOVW_PREL_G1_NC	290
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G2
+#define R_AARCH64_MOVW_PREL_G2		291
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G2_NC
+#define R_AARCH64_MOVW_PREL_G2_NC	292
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G3
+#define R_AARCH64_MOVW_PREL_G3		293
+#endif
+#ifndef R_AARCH64_LDST128_ABS_LO12_NC
+#define R_AARCH64_LDST128_ABS_LO12_NC	299
+#endif
+
+/* Global state of the processed ELF. */
+static struct {
+	const char	*path;
+	char		*begin;
+	size_t		size;
+	Elf64_Ehdr	*ehdr;
+	Elf64_Shdr	*sh_table;
+	const char	*sh_string;
+} elf;
+
+#define fatal_error(fmt, ...)						\
+	({								\
+		fprintf(stderr, "error: %s: " fmt "\n",			\
+			elf.path, ## __VA_ARGS__);			\
+		exit(EXIT_FAILURE);					\
+		__builtin_unreachable();				\
+	})
+
+#define fatal_perror(msg)						\
+	({								\
+		fprintf(stderr, "error: %s: " msg ": %s\n",		\
+			elf.path, strerror(errno));			\
+		exit(EXIT_FAILURE);					\
+		__builtin_unreachable();				\
+	})
+
+#define assert_op(lhs, rhs, fmt, op)					\
+	({								\
+		typeof(lhs) _lhs = (lhs);				\
+		typeof(rhs) _rhs = (rhs);				\
+									\
+		if (!(_lhs op _rhs)) {					\
+			fatal_error("assertion " #lhs " " #op " " #rhs	\
+				" failed (lhs=" fmt ", rhs=" fmt	\
+				", line=%d)", _lhs, _rhs, __LINE__);	\
+		}							\
+	})
+
+#define assert_eq(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, ==)
+#define assert_ne(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, !=)
+#define assert_lt(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, <)
+#define assert_ge(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, >=)
+
+/*
+ * Return a pointer of a given type at a given offset from
+ * the beginning of the ELF file.
+ */
+#define elf_ptr(type, off) ((type *)(elf.begin + (off)))
+
+/* Iterate over all sections in the ELF. */
+#define for_each_section(var) \
+	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
+
+/* Iterate over all Elf64_Rela relocations in a given section. */
+#define for_each_rela(shdr, var)					\
+	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
+	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
+
+/* True if a string starts with a given prefix. */
+static inline bool starts_with(const char *str, const char *prefix)
+{
+	return memcmp(str, prefix, strlen(prefix)) == 0;
+}
+
+/* Returns a string containing the name of a given section. */
+static inline const char *section_name(Elf64_Shdr *shdr)
+{
+	return elf.sh_string + shdr->sh_name;
+}
+
+/* Returns a pointer to the first byte of section data. */
+static inline const char *section_begin(Elf64_Shdr *shdr)
+{
+	return elf_ptr(char, shdr->sh_offset);
+}
+
+/* Find a section by its offset from the beginning of the file. */
+static inline Elf64_Shdr *section_by_off(Elf64_Off off)
+{
+	assert_ne(off, 0UL, "%lu");
+	return elf_ptr(Elf64_Shdr, off);
+}
+
+/* Find a section by its index. */
+static inline Elf64_Shdr *section_by_idx(uint16_t idx)
+{
+	assert_ne(idx, SHN_UNDEF, "%u");
+	return &elf.sh_table[idx];
+}
+
+/*
+ * Memory-map the given ELF file, perform sanity checks, and
+ * populate global state.
+ */
+static void init_elf(const char *path)
+{
+	int fd, ret;
+	struct stat stat;
+
+	/* Store path in the global struct for error printing. */
+	elf.path = path;
+
+	/* Open the ELF file. */
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		fatal_perror("Could not open ELF file");
+
+	/* Get status of ELF file to obtain its size. */
+	ret = fstat(fd, &stat);
+	if (ret < 0) {
+		close(fd);
+		fatal_perror("Could not get status of ELF file");
+	}
+
+	/* mmap() the entire ELF file read-only at an arbitrary address. */
+	elf.begin = mmap(0, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (elf.begin == MAP_FAILED) {
+		close(fd);
+		fatal_perror("Could not mmap ELF file");
+	}
+
+	/* mmap() was successful, close the FD. */
+	close(fd);
+
+	/* Get pointer to the ELF header. */
+	assert_ge(stat.st_size, sizeof(*elf.ehdr), "%lu");
+	elf.ehdr = elf_ptr(Elf64_Ehdr, 0);
+
+	/* Check the ELF magic. */
+	assert_eq(elf.ehdr->e_ident[EI_MAG0], ELFMAG0, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG1], ELFMAG1, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG2], ELFMAG2, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG3], ELFMAG3, "0x%x");
+
+	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
+	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
+	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
+	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
+	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
+
+	/* Populate fields of the global struct. */
+	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
+	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
+}
+
+/* Print the prologue of the output ASM file. */
+static void emit_prologue(void)
+{
+	printf(".data\n"
+	       ".pushsection " HYP_RELOC_SECTION ", \"a\"\n");
+}
+
+/* Print ASM statements needed as a prologue to a processed hyp section. */
+static void emit_section_prologue(const char *sh_orig_name)
+{
+	/* Declare the hyp section symbol. */
+	printf(".global %s%s\n", HYP_SECTION_SYMBOL_PREFIX, sh_orig_name);
+}
+
+/*
+ * Print ASM statements to create a hyp relocation entry for a given
+ * R_AARCH64_ABS64 relocation.
+ *
+ * The linker of vmlinux will populate the position given by `rela` with
+ * an absolute 64-bit kernel VA. If the kernel is relocatable, it will
+ * also generate a dynamic relocation entry so that the kernel can shift
+ * the address at runtime for KASLR.
+ *
+ * Emit a 32-bit offset from the current address to the position given
+ * by `rela`. This way the kernel can iterate over all kernel VAs used
+ * by hyp at runtime and convert them to hyp VAs. However, that offset
+ * will not be known until linking of `vmlinux`, so emit a PREL32
+ * relocation referencing a symbol that the hyp linker script put at
+ * the beginning of the relocated section + the offset from `rela`.
+ */
+static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
+{
+	/* Offset of this reloc from the beginning of HYP_RELOC_SECTION. */
+	static size_t reloc_offset;
+
+	/* Create storage for the 32-bit offset. */
+	printf(".word 0\n");
+
+	/*
+	 * Create a PREL32 relocation which instructs the linker of `vmlinux`
+	 * to insert offset to position <base> + <offset>, where <base> is
+	 * a symbol at the beginning of the relocated section, and <offset>
+	 * is `rela->r_offset`.
+	 */
+	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
+		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
+		rela->r_offset);
+
+	reloc_offset += 4;
+}
+
+/* Print the epilogue of the output ASM file. */
+static void emit_epilogue(void)
+{
+	printf(".popsection\n");
+}
+
+/*
+ * Iterate over all RELA relocations in a given section and emit
+ * hyp relocation data for all absolute addresses in hyp code/data.
+ *
+ * Static relocations that generate PC-relative-addressing are ignored.
+ * Failure is reported for unexpected relocation types.
+ */
+static void emit_rela_section(Elf64_Shdr *sh_rela)
+{
+	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
+	const char *sh_orig_name = section_name(sh_orig);
+	Elf64_Rela *rela;
+
+	/* Skip all non-hyp sections. */
+	if (!starts_with(sh_orig_name, HYP_SECTION_PREFIX))
+		return;
+
+	emit_section_prologue(sh_orig_name);
+
+	for_each_rela(sh_rela, rela) {
+		uint32_t type = (uint32_t)rela->r_info;
+
+		/* Check that rela points inside the relocated section. */
+		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
+
+		switch (type) {
+		/*
+		 * Data relocations to generate absolute addressing.
+		 * Emit a hyp relocation.
+		 */
+		case R_AARCH64_ABS64:
+			emit_rela_abs64(rela, sh_orig_name);
+			break;
+		/* Allow relocations to generate PC-relative addressing. */
+		case R_AARCH64_LD_PREL_LO19:
+		case R_AARCH64_ADR_PREL_LO21:
+		case R_AARCH64_ADR_PREL_PG_HI21:
+		case R_AARCH64_ADR_PREL_PG_HI21_NC:
+		case R_AARCH64_ADD_ABS_LO12_NC:
+		case R_AARCH64_LDST8_ABS_LO12_NC:
+		case R_AARCH64_LDST16_ABS_LO12_NC:
+		case R_AARCH64_LDST32_ABS_LO12_NC:
+		case R_AARCH64_LDST64_ABS_LO12_NC:
+		case R_AARCH64_LDST128_ABS_LO12_NC:
+			break;
+		/* Allow relative relocations for control-flow instructions. */
+		case R_AARCH64_TSTBR14:
+		case R_AARCH64_CONDBR19:
+		case R_AARCH64_JUMP26:
+		case R_AARCH64_CALL26:
+			break;
+		/* Allow group relocations to create PC-relative offset inline. */
+		case R_AARCH64_MOVW_PREL_G0:
+		case R_AARCH64_MOVW_PREL_G0_NC:
+		case R_AARCH64_MOVW_PREL_G1:
+		case R_AARCH64_MOVW_PREL_G1_NC:
+		case R_AARCH64_MOVW_PREL_G2:
+		case R_AARCH64_MOVW_PREL_G2_NC:
+		case R_AARCH64_MOVW_PREL_G3:
+			break;
+		default:
+			fatal_error("Unexpected RELA type %u", type);
+		}
+	}
+}
+
+/* Iterate over all sections and emit hyp relocation data for RELA sections. */
+static void emit_all_relocs(void)
+{
+	Elf64_Shdr *shdr;
+
+	for_each_section(shdr) {
+		switch (shdr->sh_type) {
+		case SHT_REL:
+			fatal_error("Unexpected SHT_REL section \"%s\"",
+				section_name(shdr));
+		case SHT_RELA:
+			emit_rela_section(shdr);
+			break;
+		}
+	}
+}
+
+int main(int argc, const char **argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <elf_input>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	init_elf(argv[1]);
+
+	emit_prologue();
+	emit_all_relocs();
+	emit_epilogue();
+
+	return EXIT_SUCCESS;
+}
-- 
2.29.2.729.g45daf8777d-goog


^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

Add a post-processing step to compilation of KVM nVHE hyp code which
calls a custom host tool (gen-hyprel) on the partially linked object
file (hyp sections' names prefixed).

The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
sections and generates an assembly file that will form a new section
.hyp.reloc in the kernel binary. The new section contains an array of
32-bit offsets to the positions targeted by these relocations.

Since these addresses of those positions will not be determined until
linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
relocation with addend <section_base_sym> + <r_offset>. The linker of
`vmlinux` will therefore fill the slot accordingly.

This relocation data will be used at runtime to convert the kernel VAs
at those positions to hyp VAs.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/kernel/vmlinux.lds.S      |  11 +
 arch/arm64/kvm/hyp/nvhe/.gitignore   |   2 +
 arch/arm64/kvm/hyp/nvhe/Makefile     |  28 +-
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 413 +++++++++++++++++++++++++++
 4 files changed, 451 insertions(+), 3 deletions(-)
 create mode 100644 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 9672b54bba7c..636ca45aa1d4 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -43,10 +43,19 @@ jiffies = jiffies_64;
 	HYP_SECTION_NAME(.data..percpu) : {			\
 		*(HYP_SECTION_NAME(.data..percpu))		\
 	}
+
+#define HYPERVISOR_RELOC_SECTION				\
+	.hyp.reloc : ALIGN(4) {					\
+		__hyp_reloc_begin = .;				\
+		*(.hyp.reloc)					\
+		__hyp_reloc_end = .;				\
+	}
+
 #else /* CONFIG_KVM */
 #define HYPERVISOR_EXTABLE
 #define HYPERVISOR_DATA_SECTIONS
 #define HYPERVISOR_PERCPU_SECTION
+#define HYPERVISOR_RELOC_SECTION
 #endif
 
 #define HYPERVISOR_TEXT					\
@@ -217,6 +226,8 @@ SECTIONS
 	PERCPU_SECTION(L1_CACHE_BYTES)
 	HYPERVISOR_PERCPU_SECTION
 
+	HYPERVISOR_RELOC_SECTION
+
 	.rela.dyn : ALIGN(8) {
 		*(.rela .rela*)
 	}
diff --git a/arch/arm64/kvm/hyp/nvhe/.gitignore b/arch/arm64/kvm/hyp/nvhe/.gitignore
index 695d73d0249e..5b6c43cc96f8 100644
--- a/arch/arm64/kvm/hyp/nvhe/.gitignore
+++ b/arch/arm64/kvm/hyp/nvhe/.gitignore
@@ -1,2 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
+gen-hyprel
 hyp.lds
+hyp-reloc.S
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 1f1e351c5fe2..268be1376f74 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -6,6 +6,8 @@
 asflags-y := -D__KVM_NVHE_HYPERVISOR__
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__
 
+hostprogs := gen-hyprel
+
 obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
 	 hyp-main.o hyp-smp.o psci-relay.o
 obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
@@ -19,7 +21,7 @@ obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
 
 hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y))
 obj-y := kvm_nvhe.o
-extra-y := $(hyp-obj) kvm_nvhe.tmp.o hyp.lds
+extra-y := $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o
 
 # 1) Compile all source files to `.nvhe.o` object files. The file extension
 #    avoids file name clashes for files shared with VHE.
@@ -42,11 +44,31 @@ LDFLAGS_kvm_nvhe.tmp.o := -r -T
 $(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE
 	$(call if_changed,ld)
 
-# 4) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
+# 4) Generate list of hyp code/data positions that need to be relocated at
+#    runtime. Because the hypervisor is part of the kernel binary, relocations
+#    produce a kernel VA. We enumerate relocations targeting hyp at build time
+#    and convert the kernel VAs at those positions to hyp VAs.
+$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel
+	$(call if_changed,hyprel)
+
+# 5) Compile hyp-reloc.S and link it into the existing partially linked object.
+#    The object file now contains a section with pointers to hyp positions that
+#    will contain kernel VAs at runtime. These pointers have relocations on them
+#    so that they get updated as the hyp object is linked into `vmlinux`.
+LDFLAGS_kvm_nvhe.rel.o := -r
+$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE
+	$(call if_changed,ld)
+
+# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
 #    Prefixes names of ELF symbols with '__kvm_nvhe_'.
-$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.tmp.o FORCE
+$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE
 	$(call if_changed,hypcopy)
 
+# The HYPREL command calls `gen-hyprel` to generate an assembly file with
+# a list of relocations targeting hyp code/data.
+quiet_cmd_hyprel = HYPREL  $@
+      cmd_hyprel = $(obj)/gen-hyprel $< > $@
+
 # The HYPCOPY command uses `objcopy` to prefix all ELF symbol names
 # to avoid clashes with VHE code/data.
 quiet_cmd_hypcopy = HYPCOPY $@
diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
new file mode 100644
index 000000000000..58fe31fdba8e
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
@@ -0,0 +1,413 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: David Brazdil <dbrazdil@google.com>
+ *
+ * Generates relocation information used by the kernel to convert
+ * absolute addresses in hyp data from kernel VAs to hyp VAs.
+ *
+ * This is necessary because hyp code is linked into the same binary
+ * as the kernel but executes under different memory mappings.
+ * If the compiler used absolute addressing, those addresses need to
+ * be converted before they are used by hyp code.
+ *
+ * The input of this program is the relocatable ELF object containing
+ * all hyp code/data, not yet linked into vmlinux. Hyp section names
+ * should have been prefixed with `.hyp` at this point.
+ *
+ * The output (printed to stdout) is an assembly file containing
+ * an array of 32-bit integers and static relocations that instruct
+ * the linker of `vmlinux` to populate the array entries with offsets
+ * to positions in the kernel binary containing VAs used by hyp code.
+ *
+ * Note that dynamic relocations could be used for the same purpose.
+ * However, those are only generated if CONFIG_RELOCATABLE=y.
+ */
+
+#include <elf.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define HYP_SECTION_PREFIX		".hyp"
+#define HYP_RELOC_SECTION		".hyp.reloc"
+#define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
+
+/*
+ * AArch64 relocation type constants.
+ * Included in case these are not defined in the host toolchain.
+ */
+#ifndef R_AARCH64_ABS64
+#define R_AARCH64_ABS64			257
+#endif
+#ifndef R_AARCH64_LD_PREL_LO19
+#define R_AARCH64_LD_PREL_LO19		273
+#endif
+#ifndef R_AARCH64_ADR_PREL_LO21
+#define R_AARCH64_ADR_PREL_LO21		274
+#endif
+#ifndef R_AARCH64_ADR_PREL_PG_HI21
+#define R_AARCH64_ADR_PREL_PG_HI21	275
+#endif
+#ifndef R_AARCH64_ADR_PREL_PG_HI21_NC
+#define R_AARCH64_ADR_PREL_PG_HI21_NC	276
+#endif
+#ifndef R_AARCH64_ADD_ABS_LO12_NC
+#define R_AARCH64_ADD_ABS_LO12_NC	277
+#endif
+#ifndef R_AARCH64_LDST8_ABS_LO12_NC
+#define R_AARCH64_LDST8_ABS_LO12_NC	278
+#endif
+#ifndef R_AARCH64_TSTBR14
+#define R_AARCH64_TSTBR14		279
+#endif
+#ifndef R_AARCH64_CONDBR19
+#define R_AARCH64_CONDBR19		280
+#endif
+#ifndef R_AARCH64_JUMP26
+#define R_AARCH64_JUMP26		282
+#endif
+#ifndef R_AARCH64_CALL26
+#define R_AARCH64_CALL26		283
+#endif
+#ifndef R_AARCH64_LDST16_ABS_LO12_NC
+#define R_AARCH64_LDST16_ABS_LO12_NC	284
+#endif
+#ifndef R_AARCH64_LDST32_ABS_LO12_NC
+#define R_AARCH64_LDST32_ABS_LO12_NC	285
+#endif
+#ifndef R_AARCH64_LDST64_ABS_LO12_NC
+#define R_AARCH64_LDST64_ABS_LO12_NC	286
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G0
+#define R_AARCH64_MOVW_PREL_G0		287
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G0_NC
+#define R_AARCH64_MOVW_PREL_G0_NC	288
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G1
+#define R_AARCH64_MOVW_PREL_G1		289
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G1_NC
+#define R_AARCH64_MOVW_PREL_G1_NC	290
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G2
+#define R_AARCH64_MOVW_PREL_G2		291
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G2_NC
+#define R_AARCH64_MOVW_PREL_G2_NC	292
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G3
+#define R_AARCH64_MOVW_PREL_G3		293
+#endif
+#ifndef R_AARCH64_LDST128_ABS_LO12_NC
+#define R_AARCH64_LDST128_ABS_LO12_NC	299
+#endif
+
+/* Global state of the processed ELF. */
+static struct {
+	const char	*path;
+	char		*begin;
+	size_t		size;
+	Elf64_Ehdr	*ehdr;
+	Elf64_Shdr	*sh_table;
+	const char	*sh_string;
+} elf;
+
+#define fatal_error(fmt, ...)						\
+	({								\
+		fprintf(stderr, "error: %s: " fmt "\n",			\
+			elf.path, ## __VA_ARGS__);			\
+		exit(EXIT_FAILURE);					\
+		__builtin_unreachable();				\
+	})
+
+#define fatal_perror(msg)						\
+	({								\
+		fprintf(stderr, "error: %s: " msg ": %s\n",		\
+			elf.path, strerror(errno));			\
+		exit(EXIT_FAILURE);					\
+		__builtin_unreachable();				\
+	})
+
+#define assert_op(lhs, rhs, fmt, op)					\
+	({								\
+		typeof(lhs) _lhs = (lhs);				\
+		typeof(rhs) _rhs = (rhs);				\
+									\
+		if (!(_lhs op _rhs)) {					\
+			fatal_error("assertion " #lhs " " #op " " #rhs	\
+				" failed (lhs=" fmt ", rhs=" fmt	\
+				", line=%d)", _lhs, _rhs, __LINE__);	\
+		}							\
+	})
+
+#define assert_eq(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, ==)
+#define assert_ne(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, !=)
+#define assert_lt(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, <)
+#define assert_ge(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, >=)
+
+/*
+ * Return a pointer of a given type at a given offset from
+ * the beginning of the ELF file.
+ */
+#define elf_ptr(type, off) ((type *)(elf.begin + (off)))
+
+/* Iterate over all sections in the ELF. */
+#define for_each_section(var) \
+	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
+
+/* Iterate over all Elf64_Rela relocations in a given section. */
+#define for_each_rela(shdr, var)					\
+	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
+	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
+
+/* True if a string starts with a given prefix. */
+static inline bool starts_with(const char *str, const char *prefix)
+{
+	return memcmp(str, prefix, strlen(prefix)) == 0;
+}
+
+/* Returns a string containing the name of a given section. */
+static inline const char *section_name(Elf64_Shdr *shdr)
+{
+	return elf.sh_string + shdr->sh_name;
+}
+
+/* Returns a pointer to the first byte of section data. */
+static inline const char *section_begin(Elf64_Shdr *shdr)
+{
+	return elf_ptr(char, shdr->sh_offset);
+}
+
+/* Find a section by its offset from the beginning of the file. */
+static inline Elf64_Shdr *section_by_off(Elf64_Off off)
+{
+	assert_ne(off, 0UL, "%lu");
+	return elf_ptr(Elf64_Shdr, off);
+}
+
+/* Find a section by its index. */
+static inline Elf64_Shdr *section_by_idx(uint16_t idx)
+{
+	assert_ne(idx, SHN_UNDEF, "%u");
+	return &elf.sh_table[idx];
+}
+
+/*
+ * Memory-map the given ELF file, perform sanity checks, and
+ * populate global state.
+ */
+static void init_elf(const char *path)
+{
+	int fd, ret;
+	struct stat stat;
+
+	/* Store path in the global struct for error printing. */
+	elf.path = path;
+
+	/* Open the ELF file. */
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		fatal_perror("Could not open ELF file");
+
+	/* Get status of ELF file to obtain its size. */
+	ret = fstat(fd, &stat);
+	if (ret < 0) {
+		close(fd);
+		fatal_perror("Could not get status of ELF file");
+	}
+
+	/* mmap() the entire ELF file read-only at an arbitrary address. */
+	elf.begin = mmap(0, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (elf.begin == MAP_FAILED) {
+		close(fd);
+		fatal_perror("Could not mmap ELF file");
+	}
+
+	/* mmap() was successful, close the FD. */
+	close(fd);
+
+	/* Get pointer to the ELF header. */
+	assert_ge(stat.st_size, sizeof(*elf.ehdr), "%lu");
+	elf.ehdr = elf_ptr(Elf64_Ehdr, 0);
+
+	/* Check the ELF magic. */
+	assert_eq(elf.ehdr->e_ident[EI_MAG0], ELFMAG0, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG1], ELFMAG1, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG2], ELFMAG2, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG3], ELFMAG3, "0x%x");
+
+	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
+	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
+	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
+	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
+	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
+
+	/* Populate fields of the global struct. */
+	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
+	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
+}
+
+/* Print the prologue of the output ASM file. */
+static void emit_prologue(void)
+{
+	printf(".data\n"
+	       ".pushsection " HYP_RELOC_SECTION ", \"a\"\n");
+}
+
+/* Print ASM statements needed as a prologue to a processed hyp section. */
+static void emit_section_prologue(const char *sh_orig_name)
+{
+	/* Declare the hyp section symbol. */
+	printf(".global %s%s\n", HYP_SECTION_SYMBOL_PREFIX, sh_orig_name);
+}
+
+/*
+ * Print ASM statements to create a hyp relocation entry for a given
+ * R_AARCH64_ABS64 relocation.
+ *
+ * The linker of vmlinux will populate the position given by `rela` with
+ * an absolute 64-bit kernel VA. If the kernel is relocatable, it will
+ * also generate a dynamic relocation entry so that the kernel can shift
+ * the address at runtime for KASLR.
+ *
+ * Emit a 32-bit offset from the current address to the position given
+ * by `rela`. This way the kernel can iterate over all kernel VAs used
+ * by hyp at runtime and convert them to hyp VAs. However, that offset
+ * will not be known until linking of `vmlinux`, so emit a PREL32
+ * relocation referencing a symbol that the hyp linker script put at
+ * the beginning of the relocated section + the offset from `rela`.
+ */
+static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
+{
+	/* Offset of this reloc from the beginning of HYP_RELOC_SECTION. */
+	static size_t reloc_offset;
+
+	/* Create storage for the 32-bit offset. */
+	printf(".word 0\n");
+
+	/*
+	 * Create a PREL32 relocation which instructs the linker of `vmlinux`
+	 * to insert offset to position <base> + <offset>, where <base> is
+	 * a symbol at the beginning of the relocated section, and <offset>
+	 * is `rela->r_offset`.
+	 */
+	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
+		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
+		rela->r_offset);
+
+	reloc_offset += 4;
+}
+
+/* Print the epilogue of the output ASM file. */
+static void emit_epilogue(void)
+{
+	printf(".popsection\n");
+}
+
+/*
+ * Iterate over all RELA relocations in a given section and emit
+ * hyp relocation data for all absolute addresses in hyp code/data.
+ *
+ * Static relocations that generate PC-relative-addressing are ignored.
+ * Failure is reported for unexpected relocation types.
+ */
+static void emit_rela_section(Elf64_Shdr *sh_rela)
+{
+	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
+	const char *sh_orig_name = section_name(sh_orig);
+	Elf64_Rela *rela;
+
+	/* Skip all non-hyp sections. */
+	if (!starts_with(sh_orig_name, HYP_SECTION_PREFIX))
+		return;
+
+	emit_section_prologue(sh_orig_name);
+
+	for_each_rela(sh_rela, rela) {
+		uint32_t type = (uint32_t)rela->r_info;
+
+		/* Check that rela points inside the relocated section. */
+		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
+
+		switch (type) {
+		/*
+		 * Data relocations to generate absolute addressing.
+		 * Emit a hyp relocation.
+		 */
+		case R_AARCH64_ABS64:
+			emit_rela_abs64(rela, sh_orig_name);
+			break;
+		/* Allow relocations to generate PC-relative addressing. */
+		case R_AARCH64_LD_PREL_LO19:
+		case R_AARCH64_ADR_PREL_LO21:
+		case R_AARCH64_ADR_PREL_PG_HI21:
+		case R_AARCH64_ADR_PREL_PG_HI21_NC:
+		case R_AARCH64_ADD_ABS_LO12_NC:
+		case R_AARCH64_LDST8_ABS_LO12_NC:
+		case R_AARCH64_LDST16_ABS_LO12_NC:
+		case R_AARCH64_LDST32_ABS_LO12_NC:
+		case R_AARCH64_LDST64_ABS_LO12_NC:
+		case R_AARCH64_LDST128_ABS_LO12_NC:
+			break;
+		/* Allow relative relocations for control-flow instructions. */
+		case R_AARCH64_TSTBR14:
+		case R_AARCH64_CONDBR19:
+		case R_AARCH64_JUMP26:
+		case R_AARCH64_CALL26:
+			break;
+		/* Allow group relocations to create PC-relative offset inline. */
+		case R_AARCH64_MOVW_PREL_G0:
+		case R_AARCH64_MOVW_PREL_G0_NC:
+		case R_AARCH64_MOVW_PREL_G1:
+		case R_AARCH64_MOVW_PREL_G1_NC:
+		case R_AARCH64_MOVW_PREL_G2:
+		case R_AARCH64_MOVW_PREL_G2_NC:
+		case R_AARCH64_MOVW_PREL_G3:
+			break;
+		default:
+			fatal_error("Unexpected RELA type %u", type);
+		}
+	}
+}
+
+/* Iterate over all sections and emit hyp relocation data for RELA sections. */
+static void emit_all_relocs(void)
+{
+	Elf64_Shdr *shdr;
+
+	for_each_section(shdr) {
+		switch (shdr->sh_type) {
+		case SHT_REL:
+			fatal_error("Unexpected SHT_REL section \"%s\"",
+				section_name(shdr));
+		case SHT_RELA:
+			emit_rela_section(shdr);
+			break;
+		}
+	}
+}
+
+int main(int argc, const char **argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <elf_input>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	init_elf(argv[1]);
+
+	emit_prologue();
+	emit_all_relocs();
+	emit_epilogue();
+
+	return EXIT_SUCCESS;
+}
-- 
2.29.2.729.g45daf8777d-goog

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^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Add a post-processing step to compilation of KVM nVHE hyp code which
calls a custom host tool (gen-hyprel) on the partially linked object
file (hyp sections' names prefixed).

The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
sections and generates an assembly file that will form a new section
.hyp.reloc in the kernel binary. The new section contains an array of
32-bit offsets to the positions targeted by these relocations.

Since these addresses of those positions will not be determined until
linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
relocation with addend <section_base_sym> + <r_offset>. The linker of
`vmlinux` will therefore fill the slot accordingly.

This relocation data will be used at runtime to convert the kernel VAs
at those positions to hyp VAs.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/kernel/vmlinux.lds.S      |  11 +
 arch/arm64/kvm/hyp/nvhe/.gitignore   |   2 +
 arch/arm64/kvm/hyp/nvhe/Makefile     |  28 +-
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 413 +++++++++++++++++++++++++++
 4 files changed, 451 insertions(+), 3 deletions(-)
 create mode 100644 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 9672b54bba7c..636ca45aa1d4 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -43,10 +43,19 @@ jiffies = jiffies_64;
 	HYP_SECTION_NAME(.data..percpu) : {			\
 		*(HYP_SECTION_NAME(.data..percpu))		\
 	}
+
+#define HYPERVISOR_RELOC_SECTION				\
+	.hyp.reloc : ALIGN(4) {					\
+		__hyp_reloc_begin = .;				\
+		*(.hyp.reloc)					\
+		__hyp_reloc_end = .;				\
+	}
+
 #else /* CONFIG_KVM */
 #define HYPERVISOR_EXTABLE
 #define HYPERVISOR_DATA_SECTIONS
 #define HYPERVISOR_PERCPU_SECTION
+#define HYPERVISOR_RELOC_SECTION
 #endif
 
 #define HYPERVISOR_TEXT					\
@@ -217,6 +226,8 @@ SECTIONS
 	PERCPU_SECTION(L1_CACHE_BYTES)
 	HYPERVISOR_PERCPU_SECTION
 
+	HYPERVISOR_RELOC_SECTION
+
 	.rela.dyn : ALIGN(8) {
 		*(.rela .rela*)
 	}
diff --git a/arch/arm64/kvm/hyp/nvhe/.gitignore b/arch/arm64/kvm/hyp/nvhe/.gitignore
index 695d73d0249e..5b6c43cc96f8 100644
--- a/arch/arm64/kvm/hyp/nvhe/.gitignore
+++ b/arch/arm64/kvm/hyp/nvhe/.gitignore
@@ -1,2 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
+gen-hyprel
 hyp.lds
+hyp-reloc.S
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 1f1e351c5fe2..268be1376f74 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -6,6 +6,8 @@
 asflags-y := -D__KVM_NVHE_HYPERVISOR__
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__
 
+hostprogs := gen-hyprel
+
 obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
 	 hyp-main.o hyp-smp.o psci-relay.o
 obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
@@ -19,7 +21,7 @@ obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
 
 hyp-obj := $(patsubst %.o,%.nvhe.o,$(obj-y))
 obj-y := kvm_nvhe.o
-extra-y := $(hyp-obj) kvm_nvhe.tmp.o hyp.lds
+extra-y := $(hyp-obj) kvm_nvhe.tmp.o kvm_nvhe.rel.o hyp.lds hyp-reloc.S hyp-reloc.o
 
 # 1) Compile all source files to `.nvhe.o` object files. The file extension
 #    avoids file name clashes for files shared with VHE.
@@ -42,11 +44,31 @@ LDFLAGS_kvm_nvhe.tmp.o := -r -T
 $(obj)/kvm_nvhe.tmp.o: $(obj)/hyp.lds $(addprefix $(obj)/,$(hyp-obj)) FORCE
 	$(call if_changed,ld)
 
-# 4) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
+# 4) Generate list of hyp code/data positions that need to be relocated at
+#    runtime. Because the hypervisor is part of the kernel binary, relocations
+#    produce a kernel VA. We enumerate relocations targeting hyp at build time
+#    and convert the kernel VAs at those positions to hyp VAs.
+$(obj)/hyp-reloc.S: $(obj)/kvm_nvhe.tmp.o $(obj)/gen-hyprel
+	$(call if_changed,hyprel)
+
+# 5) Compile hyp-reloc.S and link it into the existing partially linked object.
+#    The object file now contains a section with pointers to hyp positions that
+#    will contain kernel VAs at runtime. These pointers have relocations on them
+#    so that they get updated as the hyp object is linked into `vmlinux`.
+LDFLAGS_kvm_nvhe.rel.o := -r
+$(obj)/kvm_nvhe.rel.o: $(obj)/kvm_nvhe.tmp.o $(obj)/hyp-reloc.o FORCE
+	$(call if_changed,ld)
+
+# 6) Produce the final 'kvm_nvhe.o', ready to be linked into 'vmlinux'.
 #    Prefixes names of ELF symbols with '__kvm_nvhe_'.
-$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.tmp.o FORCE
+$(obj)/kvm_nvhe.o: $(obj)/kvm_nvhe.rel.o FORCE
 	$(call if_changed,hypcopy)
 
+# The HYPREL command calls `gen-hyprel` to generate an assembly file with
+# a list of relocations targeting hyp code/data.
+quiet_cmd_hyprel = HYPREL  $@
+      cmd_hyprel = $(obj)/gen-hyprel $< > $@
+
 # The HYPCOPY command uses `objcopy` to prefix all ELF symbol names
 # to avoid clashes with VHE code/data.
 quiet_cmd_hypcopy = HYPCOPY $@
diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
new file mode 100644
index 000000000000..58fe31fdba8e
--- /dev/null
+++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
@@ -0,0 +1,413 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 - Google LLC
+ * Author: David Brazdil <dbrazdil@google.com>
+ *
+ * Generates relocation information used by the kernel to convert
+ * absolute addresses in hyp data from kernel VAs to hyp VAs.
+ *
+ * This is necessary because hyp code is linked into the same binary
+ * as the kernel but executes under different memory mappings.
+ * If the compiler used absolute addressing, those addresses need to
+ * be converted before they are used by hyp code.
+ *
+ * The input of this program is the relocatable ELF object containing
+ * all hyp code/data, not yet linked into vmlinux. Hyp section names
+ * should have been prefixed with `.hyp` at this point.
+ *
+ * The output (printed to stdout) is an assembly file containing
+ * an array of 32-bit integers and static relocations that instruct
+ * the linker of `vmlinux` to populate the array entries with offsets
+ * to positions in the kernel binary containing VAs used by hyp code.
+ *
+ * Note that dynamic relocations could be used for the same purpose.
+ * However, those are only generated if CONFIG_RELOCATABLE=y.
+ */
+
+#include <elf.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define HYP_SECTION_PREFIX		".hyp"
+#define HYP_RELOC_SECTION		".hyp.reloc"
+#define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
+
+/*
+ * AArch64 relocation type constants.
+ * Included in case these are not defined in the host toolchain.
+ */
+#ifndef R_AARCH64_ABS64
+#define R_AARCH64_ABS64			257
+#endif
+#ifndef R_AARCH64_LD_PREL_LO19
+#define R_AARCH64_LD_PREL_LO19		273
+#endif
+#ifndef R_AARCH64_ADR_PREL_LO21
+#define R_AARCH64_ADR_PREL_LO21		274
+#endif
+#ifndef R_AARCH64_ADR_PREL_PG_HI21
+#define R_AARCH64_ADR_PREL_PG_HI21	275
+#endif
+#ifndef R_AARCH64_ADR_PREL_PG_HI21_NC
+#define R_AARCH64_ADR_PREL_PG_HI21_NC	276
+#endif
+#ifndef R_AARCH64_ADD_ABS_LO12_NC
+#define R_AARCH64_ADD_ABS_LO12_NC	277
+#endif
+#ifndef R_AARCH64_LDST8_ABS_LO12_NC
+#define R_AARCH64_LDST8_ABS_LO12_NC	278
+#endif
+#ifndef R_AARCH64_TSTBR14
+#define R_AARCH64_TSTBR14		279
+#endif
+#ifndef R_AARCH64_CONDBR19
+#define R_AARCH64_CONDBR19		280
+#endif
+#ifndef R_AARCH64_JUMP26
+#define R_AARCH64_JUMP26		282
+#endif
+#ifndef R_AARCH64_CALL26
+#define R_AARCH64_CALL26		283
+#endif
+#ifndef R_AARCH64_LDST16_ABS_LO12_NC
+#define R_AARCH64_LDST16_ABS_LO12_NC	284
+#endif
+#ifndef R_AARCH64_LDST32_ABS_LO12_NC
+#define R_AARCH64_LDST32_ABS_LO12_NC	285
+#endif
+#ifndef R_AARCH64_LDST64_ABS_LO12_NC
+#define R_AARCH64_LDST64_ABS_LO12_NC	286
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G0
+#define R_AARCH64_MOVW_PREL_G0		287
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G0_NC
+#define R_AARCH64_MOVW_PREL_G0_NC	288
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G1
+#define R_AARCH64_MOVW_PREL_G1		289
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G1_NC
+#define R_AARCH64_MOVW_PREL_G1_NC	290
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G2
+#define R_AARCH64_MOVW_PREL_G2		291
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G2_NC
+#define R_AARCH64_MOVW_PREL_G2_NC	292
+#endif
+#ifndef R_AARCH64_MOVW_PREL_G3
+#define R_AARCH64_MOVW_PREL_G3		293
+#endif
+#ifndef R_AARCH64_LDST128_ABS_LO12_NC
+#define R_AARCH64_LDST128_ABS_LO12_NC	299
+#endif
+
+/* Global state of the processed ELF. */
+static struct {
+	const char	*path;
+	char		*begin;
+	size_t		size;
+	Elf64_Ehdr	*ehdr;
+	Elf64_Shdr	*sh_table;
+	const char	*sh_string;
+} elf;
+
+#define fatal_error(fmt, ...)						\
+	({								\
+		fprintf(stderr, "error: %s: " fmt "\n",			\
+			elf.path, ## __VA_ARGS__);			\
+		exit(EXIT_FAILURE);					\
+		__builtin_unreachable();				\
+	})
+
+#define fatal_perror(msg)						\
+	({								\
+		fprintf(stderr, "error: %s: " msg ": %s\n",		\
+			elf.path, strerror(errno));			\
+		exit(EXIT_FAILURE);					\
+		__builtin_unreachable();				\
+	})
+
+#define assert_op(lhs, rhs, fmt, op)					\
+	({								\
+		typeof(lhs) _lhs = (lhs);				\
+		typeof(rhs) _rhs = (rhs);				\
+									\
+		if (!(_lhs op _rhs)) {					\
+			fatal_error("assertion " #lhs " " #op " " #rhs	\
+				" failed (lhs=" fmt ", rhs=" fmt	\
+				", line=%d)", _lhs, _rhs, __LINE__);	\
+		}							\
+	})
+
+#define assert_eq(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, ==)
+#define assert_ne(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, !=)
+#define assert_lt(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, <)
+#define assert_ge(lhs, rhs, fmt)	assert_op(lhs, rhs, fmt, >=)
+
+/*
+ * Return a pointer of a given type at a given offset from
+ * the beginning of the ELF file.
+ */
+#define elf_ptr(type, off) ((type *)(elf.begin + (off)))
+
+/* Iterate over all sections in the ELF. */
+#define for_each_section(var) \
+	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
+
+/* Iterate over all Elf64_Rela relocations in a given section. */
+#define for_each_rela(shdr, var)					\
+	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
+	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
+
+/* True if a string starts with a given prefix. */
+static inline bool starts_with(const char *str, const char *prefix)
+{
+	return memcmp(str, prefix, strlen(prefix)) == 0;
+}
+
+/* Returns a string containing the name of a given section. */
+static inline const char *section_name(Elf64_Shdr *shdr)
+{
+	return elf.sh_string + shdr->sh_name;
+}
+
+/* Returns a pointer to the first byte of section data. */
+static inline const char *section_begin(Elf64_Shdr *shdr)
+{
+	return elf_ptr(char, shdr->sh_offset);
+}
+
+/* Find a section by its offset from the beginning of the file. */
+static inline Elf64_Shdr *section_by_off(Elf64_Off off)
+{
+	assert_ne(off, 0UL, "%lu");
+	return elf_ptr(Elf64_Shdr, off);
+}
+
+/* Find a section by its index. */
+static inline Elf64_Shdr *section_by_idx(uint16_t idx)
+{
+	assert_ne(idx, SHN_UNDEF, "%u");
+	return &elf.sh_table[idx];
+}
+
+/*
+ * Memory-map the given ELF file, perform sanity checks, and
+ * populate global state.
+ */
+static void init_elf(const char *path)
+{
+	int fd, ret;
+	struct stat stat;
+
+	/* Store path in the global struct for error printing. */
+	elf.path = path;
+
+	/* Open the ELF file. */
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		fatal_perror("Could not open ELF file");
+
+	/* Get status of ELF file to obtain its size. */
+	ret = fstat(fd, &stat);
+	if (ret < 0) {
+		close(fd);
+		fatal_perror("Could not get status of ELF file");
+	}
+
+	/* mmap() the entire ELF file read-only at an arbitrary address. */
+	elf.begin = mmap(0, stat.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (elf.begin == MAP_FAILED) {
+		close(fd);
+		fatal_perror("Could not mmap ELF file");
+	}
+
+	/* mmap() was successful, close the FD. */
+	close(fd);
+
+	/* Get pointer to the ELF header. */
+	assert_ge(stat.st_size, sizeof(*elf.ehdr), "%lu");
+	elf.ehdr = elf_ptr(Elf64_Ehdr, 0);
+
+	/* Check the ELF magic. */
+	assert_eq(elf.ehdr->e_ident[EI_MAG0], ELFMAG0, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG1], ELFMAG1, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG2], ELFMAG2, "0x%x");
+	assert_eq(elf.ehdr->e_ident[EI_MAG3], ELFMAG3, "0x%x");
+
+	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
+	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
+	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
+	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
+	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
+
+	/* Populate fields of the global struct. */
+	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
+	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
+}
+
+/* Print the prologue of the output ASM file. */
+static void emit_prologue(void)
+{
+	printf(".data\n"
+	       ".pushsection " HYP_RELOC_SECTION ", \"a\"\n");
+}
+
+/* Print ASM statements needed as a prologue to a processed hyp section. */
+static void emit_section_prologue(const char *sh_orig_name)
+{
+	/* Declare the hyp section symbol. */
+	printf(".global %s%s\n", HYP_SECTION_SYMBOL_PREFIX, sh_orig_name);
+}
+
+/*
+ * Print ASM statements to create a hyp relocation entry for a given
+ * R_AARCH64_ABS64 relocation.
+ *
+ * The linker of vmlinux will populate the position given by `rela` with
+ * an absolute 64-bit kernel VA. If the kernel is relocatable, it will
+ * also generate a dynamic relocation entry so that the kernel can shift
+ * the address at runtime for KASLR.
+ *
+ * Emit a 32-bit offset from the current address to the position given
+ * by `rela`. This way the kernel can iterate over all kernel VAs used
+ * by hyp at runtime and convert them to hyp VAs. However, that offset
+ * will not be known until linking of `vmlinux`, so emit a PREL32
+ * relocation referencing a symbol that the hyp linker script put at
+ * the beginning of the relocated section + the offset from `rela`.
+ */
+static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
+{
+	/* Offset of this reloc from the beginning of HYP_RELOC_SECTION. */
+	static size_t reloc_offset;
+
+	/* Create storage for the 32-bit offset. */
+	printf(".word 0\n");
+
+	/*
+	 * Create a PREL32 relocation which instructs the linker of `vmlinux`
+	 * to insert offset to position <base> + <offset>, where <base> is
+	 * a symbol at the beginning of the relocated section, and <offset>
+	 * is `rela->r_offset`.
+	 */
+	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
+		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
+		rela->r_offset);
+
+	reloc_offset += 4;
+}
+
+/* Print the epilogue of the output ASM file. */
+static void emit_epilogue(void)
+{
+	printf(".popsection\n");
+}
+
+/*
+ * Iterate over all RELA relocations in a given section and emit
+ * hyp relocation data for all absolute addresses in hyp code/data.
+ *
+ * Static relocations that generate PC-relative-addressing are ignored.
+ * Failure is reported for unexpected relocation types.
+ */
+static void emit_rela_section(Elf64_Shdr *sh_rela)
+{
+	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
+	const char *sh_orig_name = section_name(sh_orig);
+	Elf64_Rela *rela;
+
+	/* Skip all non-hyp sections. */
+	if (!starts_with(sh_orig_name, HYP_SECTION_PREFIX))
+		return;
+
+	emit_section_prologue(sh_orig_name);
+
+	for_each_rela(sh_rela, rela) {
+		uint32_t type = (uint32_t)rela->r_info;
+
+		/* Check that rela points inside the relocated section. */
+		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
+
+		switch (type) {
+		/*
+		 * Data relocations to generate absolute addressing.
+		 * Emit a hyp relocation.
+		 */
+		case R_AARCH64_ABS64:
+			emit_rela_abs64(rela, sh_orig_name);
+			break;
+		/* Allow relocations to generate PC-relative addressing. */
+		case R_AARCH64_LD_PREL_LO19:
+		case R_AARCH64_ADR_PREL_LO21:
+		case R_AARCH64_ADR_PREL_PG_HI21:
+		case R_AARCH64_ADR_PREL_PG_HI21_NC:
+		case R_AARCH64_ADD_ABS_LO12_NC:
+		case R_AARCH64_LDST8_ABS_LO12_NC:
+		case R_AARCH64_LDST16_ABS_LO12_NC:
+		case R_AARCH64_LDST32_ABS_LO12_NC:
+		case R_AARCH64_LDST64_ABS_LO12_NC:
+		case R_AARCH64_LDST128_ABS_LO12_NC:
+			break;
+		/* Allow relative relocations for control-flow instructions. */
+		case R_AARCH64_TSTBR14:
+		case R_AARCH64_CONDBR19:
+		case R_AARCH64_JUMP26:
+		case R_AARCH64_CALL26:
+			break;
+		/* Allow group relocations to create PC-relative offset inline. */
+		case R_AARCH64_MOVW_PREL_G0:
+		case R_AARCH64_MOVW_PREL_G0_NC:
+		case R_AARCH64_MOVW_PREL_G1:
+		case R_AARCH64_MOVW_PREL_G1_NC:
+		case R_AARCH64_MOVW_PREL_G2:
+		case R_AARCH64_MOVW_PREL_G2_NC:
+		case R_AARCH64_MOVW_PREL_G3:
+			break;
+		default:
+			fatal_error("Unexpected RELA type %u", type);
+		}
+	}
+}
+
+/* Iterate over all sections and emit hyp relocation data for RELA sections. */
+static void emit_all_relocs(void)
+{
+	Elf64_Shdr *shdr;
+
+	for_each_section(shdr) {
+		switch (shdr->sh_type) {
+		case SHT_REL:
+			fatal_error("Unexpected SHT_REL section \"%s\"",
+				section_name(shdr));
+		case SHT_RELA:
+			emit_rela_section(shdr);
+			break;
+		}
+	}
+}
+
+int main(int argc, const char **argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s <elf_input>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	init_elf(argv[1]);
+
+	emit_prologue();
+	emit_all_relocs();
+	emit_epilogue();
+
+	return EXIT_SUCCESS;
+}
-- 
2.29.2.729.g45daf8777d-goog


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^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 5/8] KVM: arm64: Apply hyp relocations at runtime
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-05 18:05   ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

KVM nVHE code runs under a different VA mapping than the kernel, hence
so far it avoided using absolute addressing because the VA in a constant
pool is relocated by the linker to a kernel VA (see hyp_symbol_addr).

Now the kernel has access to a list of positions that contain a kimg VA
but will be accessed only in hyp execution context. These are generated
by the gen-hyprel build-time tool and stored in .hyp.reloc.

Add early boot pass over the entries and convert the kimg VAs to hyp VAs.
Note that this requires for .hyp* ELF sections to be mapped read-write
at that point.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h  |  1 +
 arch/arm64/include/asm/sections.h |  1 +
 arch/arm64/kernel/smp.c           |  4 +++-
 arch/arm64/kvm/va_layout.c        | 28 ++++++++++++++++++++++++++++
 4 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index e52d82aeadca..6bbb44011c84 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -129,6 +129,7 @@ alternative_cb_end
 void kvm_update_va_mask(struct alt_instr *alt,
 			__le32 *origptr, __le32 *updptr, int nr_inst);
 void kvm_compute_layout(void);
+void kvm_apply_hyp_relocations(void);
 
 static __always_inline unsigned long __kern_hyp_va(unsigned long v)
 {
diff --git a/arch/arm64/include/asm/sections.h b/arch/arm64/include/asm/sections.h
index a6f3557d1ab2..2f36b16a5b5d 100644
--- a/arch/arm64/include/asm/sections.h
+++ b/arch/arm64/include/asm/sections.h
@@ -12,6 +12,7 @@ extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[];
 extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
 extern char __hyp_text_start[], __hyp_text_end[];
 extern char __hyp_rodata_start[], __hyp_rodata_end[];
+extern char __hyp_reloc_begin[], __hyp_reloc_end[];
 extern char __idmap_text_start[], __idmap_text_end[];
 extern char __initdata_begin[], __initdata_end[];
 extern char __inittext_begin[], __inittext_end[];
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index d08948c6979b..006f61a86438 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -434,8 +434,10 @@ static void __init hyp_mode_check(void)
 			   "CPU: CPUs started in inconsistent modes");
 	else
 		pr_info("CPU: All CPU(s) started at EL1\n");
-	if (IS_ENABLED(CONFIG_KVM) && !is_kernel_in_hyp_mode())
+	if (IS_ENABLED(CONFIG_KVM) && !is_kernel_in_hyp_mode()) {
 		kvm_compute_layout();
+		kvm_apply_hyp_relocations();
+	}
 }
 
 void __init smp_cpus_done(unsigned int max_cpus)
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index 70fcd6a12fe1..fee7dcd95d73 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -81,6 +81,34 @@ __init void kvm_compute_layout(void)
 	init_hyp_physvirt_offset();
 }
 
+/*
+ * The .hyp.reloc ELF section contains a list of kimg positions that
+ * contains kimg VAs but will be accessed only in hyp execution context.
+ * Convert them to hyp VAs. See gen-hyprel.c for more details.
+ */
+__init void kvm_apply_hyp_relocations(void)
+{
+	int32_t *rel;
+	int32_t *begin = (int32_t *)__hyp_reloc_begin;
+	int32_t *end = (int32_t *)__hyp_reloc_end;
+
+	for (rel = begin; rel < end; ++rel) {
+		uintptr_t *ptr, kimg_va;
+
+		/*
+		 * Each entry contains a 32-bit relative offset from itself
+		 * to a kimg VA position.
+		 */
+		ptr = (uintptr_t *)lm_alias((char *)rel + *rel);
+
+		/* Read the kimg VA value at the relocation address. */
+		kimg_va = *ptr;
+
+		/* Convert to hyp VA and store back to the relocation address. */
+		*ptr = __early_kern_hyp_va((uintptr_t)lm_alias(kimg_va));
+	}
+}
+
 static u32 compute_instruction(int n, u32 rd, u32 rn)
 {
 	u32 insn = AARCH64_BREAK_FAULT;
-- 
2.29.2.729.g45daf8777d-goog


^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 5/8] KVM: arm64: Apply hyp relocations at runtime
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

KVM nVHE code runs under a different VA mapping than the kernel, hence
so far it avoided using absolute addressing because the VA in a constant
pool is relocated by the linker to a kernel VA (see hyp_symbol_addr).

Now the kernel has access to a list of positions that contain a kimg VA
but will be accessed only in hyp execution context. These are generated
by the gen-hyprel build-time tool and stored in .hyp.reloc.

Add early boot pass over the entries and convert the kimg VAs to hyp VAs.
Note that this requires for .hyp* ELF sections to be mapped read-write
at that point.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h  |  1 +
 arch/arm64/include/asm/sections.h |  1 +
 arch/arm64/kernel/smp.c           |  4 +++-
 arch/arm64/kvm/va_layout.c        | 28 ++++++++++++++++++++++++++++
 4 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index e52d82aeadca..6bbb44011c84 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -129,6 +129,7 @@ alternative_cb_end
 void kvm_update_va_mask(struct alt_instr *alt,
 			__le32 *origptr, __le32 *updptr, int nr_inst);
 void kvm_compute_layout(void);
+void kvm_apply_hyp_relocations(void);
 
 static __always_inline unsigned long __kern_hyp_va(unsigned long v)
 {
diff --git a/arch/arm64/include/asm/sections.h b/arch/arm64/include/asm/sections.h
index a6f3557d1ab2..2f36b16a5b5d 100644
--- a/arch/arm64/include/asm/sections.h
+++ b/arch/arm64/include/asm/sections.h
@@ -12,6 +12,7 @@ extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[];
 extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
 extern char __hyp_text_start[], __hyp_text_end[];
 extern char __hyp_rodata_start[], __hyp_rodata_end[];
+extern char __hyp_reloc_begin[], __hyp_reloc_end[];
 extern char __idmap_text_start[], __idmap_text_end[];
 extern char __initdata_begin[], __initdata_end[];
 extern char __inittext_begin[], __inittext_end[];
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index d08948c6979b..006f61a86438 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -434,8 +434,10 @@ static void __init hyp_mode_check(void)
 			   "CPU: CPUs started in inconsistent modes");
 	else
 		pr_info("CPU: All CPU(s) started at EL1\n");
-	if (IS_ENABLED(CONFIG_KVM) && !is_kernel_in_hyp_mode())
+	if (IS_ENABLED(CONFIG_KVM) && !is_kernel_in_hyp_mode()) {
 		kvm_compute_layout();
+		kvm_apply_hyp_relocations();
+	}
 }
 
 void __init smp_cpus_done(unsigned int max_cpus)
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index 70fcd6a12fe1..fee7dcd95d73 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -81,6 +81,34 @@ __init void kvm_compute_layout(void)
 	init_hyp_physvirt_offset();
 }
 
+/*
+ * The .hyp.reloc ELF section contains a list of kimg positions that
+ * contains kimg VAs but will be accessed only in hyp execution context.
+ * Convert them to hyp VAs. See gen-hyprel.c for more details.
+ */
+__init void kvm_apply_hyp_relocations(void)
+{
+	int32_t *rel;
+	int32_t *begin = (int32_t *)__hyp_reloc_begin;
+	int32_t *end = (int32_t *)__hyp_reloc_end;
+
+	for (rel = begin; rel < end; ++rel) {
+		uintptr_t *ptr, kimg_va;
+
+		/*
+		 * Each entry contains a 32-bit relative offset from itself
+		 * to a kimg VA position.
+		 */
+		ptr = (uintptr_t *)lm_alias((char *)rel + *rel);
+
+		/* Read the kimg VA value at the relocation address. */
+		kimg_va = *ptr;
+
+		/* Convert to hyp VA and store back to the relocation address. */
+		*ptr = __early_kern_hyp_va((uintptr_t)lm_alias(kimg_va));
+	}
+}
+
 static u32 compute_instruction(int n, u32 rd, u32 rn)
 {
 	u32 insn = AARCH64_BREAK_FAULT;
-- 
2.29.2.729.g45daf8777d-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 5/8] KVM: arm64: Apply hyp relocations at runtime
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

KVM nVHE code runs under a different VA mapping than the kernel, hence
so far it avoided using absolute addressing because the VA in a constant
pool is relocated by the linker to a kernel VA (see hyp_symbol_addr).

Now the kernel has access to a list of positions that contain a kimg VA
but will be accessed only in hyp execution context. These are generated
by the gen-hyprel build-time tool and stored in .hyp.reloc.

Add early boot pass over the entries and convert the kimg VAs to hyp VAs.
Note that this requires for .hyp* ELF sections to be mapped read-write
at that point.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h  |  1 +
 arch/arm64/include/asm/sections.h |  1 +
 arch/arm64/kernel/smp.c           |  4 +++-
 arch/arm64/kvm/va_layout.c        | 28 ++++++++++++++++++++++++++++
 4 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index e52d82aeadca..6bbb44011c84 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -129,6 +129,7 @@ alternative_cb_end
 void kvm_update_va_mask(struct alt_instr *alt,
 			__le32 *origptr, __le32 *updptr, int nr_inst);
 void kvm_compute_layout(void);
+void kvm_apply_hyp_relocations(void);
 
 static __always_inline unsigned long __kern_hyp_va(unsigned long v)
 {
diff --git a/arch/arm64/include/asm/sections.h b/arch/arm64/include/asm/sections.h
index a6f3557d1ab2..2f36b16a5b5d 100644
--- a/arch/arm64/include/asm/sections.h
+++ b/arch/arm64/include/asm/sections.h
@@ -12,6 +12,7 @@ extern char __hibernate_exit_text_start[], __hibernate_exit_text_end[];
 extern char __hyp_idmap_text_start[], __hyp_idmap_text_end[];
 extern char __hyp_text_start[], __hyp_text_end[];
 extern char __hyp_rodata_start[], __hyp_rodata_end[];
+extern char __hyp_reloc_begin[], __hyp_reloc_end[];
 extern char __idmap_text_start[], __idmap_text_end[];
 extern char __initdata_begin[], __initdata_end[];
 extern char __inittext_begin[], __inittext_end[];
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index d08948c6979b..006f61a86438 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -434,8 +434,10 @@ static void __init hyp_mode_check(void)
 			   "CPU: CPUs started in inconsistent modes");
 	else
 		pr_info("CPU: All CPU(s) started at EL1\n");
-	if (IS_ENABLED(CONFIG_KVM) && !is_kernel_in_hyp_mode())
+	if (IS_ENABLED(CONFIG_KVM) && !is_kernel_in_hyp_mode()) {
 		kvm_compute_layout();
+		kvm_apply_hyp_relocations();
+	}
 }
 
 void __init smp_cpus_done(unsigned int max_cpus)
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index 70fcd6a12fe1..fee7dcd95d73 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -81,6 +81,34 @@ __init void kvm_compute_layout(void)
 	init_hyp_physvirt_offset();
 }
 
+/*
+ * The .hyp.reloc ELF section contains a list of kimg positions that
+ * contains kimg VAs but will be accessed only in hyp execution context.
+ * Convert them to hyp VAs. See gen-hyprel.c for more details.
+ */
+__init void kvm_apply_hyp_relocations(void)
+{
+	int32_t *rel;
+	int32_t *begin = (int32_t *)__hyp_reloc_begin;
+	int32_t *end = (int32_t *)__hyp_reloc_end;
+
+	for (rel = begin; rel < end; ++rel) {
+		uintptr_t *ptr, kimg_va;
+
+		/*
+		 * Each entry contains a 32-bit relative offset from itself
+		 * to a kimg VA position.
+		 */
+		ptr = (uintptr_t *)lm_alias((char *)rel + *rel);
+
+		/* Read the kimg VA value at the relocation address. */
+		kimg_va = *ptr;
+
+		/* Convert to hyp VA and store back to the relocation address. */
+		*ptr = __early_kern_hyp_va((uintptr_t)lm_alias(kimg_va));
+	}
+}
+
 static u32 compute_instruction(int n, u32 rd, u32 rn)
 {
 	u32 insn = AARCH64_BREAK_FAULT;
-- 
2.29.2.729.g45daf8777d-goog


_______________________________________________
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] 57+ messages in thread
* [PATCH v2 6/8] KVM: arm64: Fix constant-pool users in hyp
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-05 18:05   ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

Hyp code uses absolute addressing to obtain a kimg VA of a small number
of kernel symbols. Since the kernel now converts constant pool addresses
to hyp VAs, this trick does not work anymore.

Change the helpers to convert from hyp VA back to kimg VA or PA, as
needed and rework the callers accordingly.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h   | 42 ++++++++++++------------------
 arch/arm64/kvm/hyp/nvhe/host.S     | 29 +++++++++++----------
 arch/arm64/kvm/hyp/nvhe/hyp-init.S |  2 --
 3 files changed, 31 insertions(+), 42 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 6bbb44011c84..adadc468cc71 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -73,49 +73,39 @@ alternative_cb_end
 .endm
 
 /*
- * Convert a kernel image address to a PA
- * reg: kernel address to be converted in place
+ * Convert a hypervisor VA to a PA
+ * reg: hypervisor address to be converted in place
  * tmp: temporary register
- *
- * The actual code generation takes place in kvm_get_kimage_voffset, and
- * the instructions below are only there to reserve the space and
- * perform the register allocation (kvm_get_kimage_voffset uses the
- * specific registers encoded in the instructions).
  */
-.macro kimg_pa reg, tmp
-alternative_cb kvm_get_kimage_voffset
-	movz	\tmp, #0
-	movk	\tmp, #0, lsl #16
-	movk	\tmp, #0, lsl #32
-	movk	\tmp, #0, lsl #48
-alternative_cb_end
-
-	/* reg = __pa(reg) */
-	sub	\reg, \reg, \tmp
+.macro hyp_pa reg, tmp
+	ldr_l	\tmp, hyp_physvirt_offset
+	add	\reg, \reg, \tmp
 .endm
 
 /*
- * Convert a kernel image address to a hyp VA
- * reg: kernel address to be converted in place
+ * Convert a hypervisor VA to a kernel image address
+ * reg: hypervisor address to be converted in place
  * tmp: temporary register
  *
  * The actual code generation takes place in kvm_get_kimage_voffset, and
  * the instructions below are only there to reserve the space and
- * perform the register allocation (kvm_update_kimg_phys_offset uses the
+ * perform the register allocation (kvm_get_kimage_voffset uses the
  * specific registers encoded in the instructions).
  */
-.macro kimg_hyp_va reg, tmp
-alternative_cb kvm_update_kimg_phys_offset
+.macro hyp_kimg_va reg, tmp
+	/* Convert hyp VA -> PA. */
+	hyp_pa	\reg, \tmp
+
+	/* Load kimage_voffset. */
+alternative_cb kvm_get_kimage_voffset
 	movz	\tmp, #0
 	movk	\tmp, #0, lsl #16
 	movk	\tmp, #0, lsl #32
 	movk	\tmp, #0, lsl #48
 alternative_cb_end
 
-	sub	\reg, \reg, \tmp
-	mov_q	\tmp, PAGE_OFFSET
-	orr	\reg, \reg, \tmp
-	kern_hyp_va \reg
+	/* Convert PA -> kimg VA. */
+	add	\reg, \reg, \tmp
 .endm
 
 #else
diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S
index a820dfdc9c25..6585a7cbbc56 100644
--- a/arch/arm64/kvm/hyp/nvhe/host.S
+++ b/arch/arm64/kvm/hyp/nvhe/host.S
@@ -74,27 +74,28 @@ SYM_FUNC_END(__host_enter)
  * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
  */
 SYM_FUNC_START(__hyp_do_panic)
-	/* Load the format arguments into x1-7 */
-	mov	x6, x3
-	get_vcpu_ptr x7, x3
-
-	mrs	x3, esr_el2
-	mrs	x4, far_el2
-	mrs	x5, hpfar_el2
-
 	/* Prepare and exit to the host's panic funciton. */
 	mov	lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
 		      PSR_MODE_EL1h)
 	msr	spsr_el2, lr
 	ldr	lr, =panic
+	hyp_kimg_va lr, x6
 	msr	elr_el2, lr
 
-	/*
-	 * Set the panic format string and enter the host, conditionally
-	 * restoring the host context.
-	 */
+	/* Set the panic format string. Use the, now free, LR as scratch. */
+	ldr	lr, =__hyp_panic_string
+	hyp_kimg_va lr, x6
+
+	/* Load the format arguments into x1-7. */
+	mov	x6, x3
+	get_vcpu_ptr x7, x3
+	mrs	x3, esr_el2
+	mrs	x4, far_el2
+	mrs	x5, hpfar_el2
+
+	/* Enter the host, conditionally restoring the host context. */
 	cmp	x0, xzr
-	ldr	x0, =__hyp_panic_string
+	mov	x0, lr
 	b.eq	__host_enter_without_restoring
 	b	__host_enter_for_panic
 SYM_FUNC_END(__hyp_do_panic)
@@ -124,7 +125,7 @@ SYM_FUNC_END(__hyp_do_panic)
 	 * Preserve x0-x4, which may contain stub parameters.
 	 */
 	ldr	x5, =__kvm_handle_stub_hvc
-	kimg_pa x5, x6
+	hyp_pa	x5, x6
 	br	x5
 .L__vect_end\@:
 .if ((.L__vect_end\@ - .L__vect_start\@) > 0x80)
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
index 68fd64f2313e..99b408fe09ee 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -139,7 +139,6 @@ alternative_else_nop_endif
 
 	/* Set the host vector */
 	ldr	x0, =__kvm_hyp_host_vector
-	kimg_hyp_va x0, x1
 	msr	vbar_el2, x0
 
 	ret
@@ -198,7 +197,6 @@ SYM_CODE_START_LOCAL(__kvm_hyp_init_cpu)
 	/* Leave idmap. */
 	mov	x0, x29
 	ldr	x1, =kvm_host_psci_cpu_entry
-	kimg_hyp_va x1, x2
 	br	x1
 SYM_CODE_END(__kvm_hyp_init_cpu)
 
-- 
2.29.2.729.g45daf8777d-goog


^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 6/8] KVM: arm64: Fix constant-pool users in hyp
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

Hyp code uses absolute addressing to obtain a kimg VA of a small number
of kernel symbols. Since the kernel now converts constant pool addresses
to hyp VAs, this trick does not work anymore.

Change the helpers to convert from hyp VA back to kimg VA or PA, as
needed and rework the callers accordingly.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h   | 42 ++++++++++++------------------
 arch/arm64/kvm/hyp/nvhe/host.S     | 29 +++++++++++----------
 arch/arm64/kvm/hyp/nvhe/hyp-init.S |  2 --
 3 files changed, 31 insertions(+), 42 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 6bbb44011c84..adadc468cc71 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -73,49 +73,39 @@ alternative_cb_end
 .endm
 
 /*
- * Convert a kernel image address to a PA
- * reg: kernel address to be converted in place
+ * Convert a hypervisor VA to a PA
+ * reg: hypervisor address to be converted in place
  * tmp: temporary register
- *
- * The actual code generation takes place in kvm_get_kimage_voffset, and
- * the instructions below are only there to reserve the space and
- * perform the register allocation (kvm_get_kimage_voffset uses the
- * specific registers encoded in the instructions).
  */
-.macro kimg_pa reg, tmp
-alternative_cb kvm_get_kimage_voffset
-	movz	\tmp, #0
-	movk	\tmp, #0, lsl #16
-	movk	\tmp, #0, lsl #32
-	movk	\tmp, #0, lsl #48
-alternative_cb_end
-
-	/* reg = __pa(reg) */
-	sub	\reg, \reg, \tmp
+.macro hyp_pa reg, tmp
+	ldr_l	\tmp, hyp_physvirt_offset
+	add	\reg, \reg, \tmp
 .endm
 
 /*
- * Convert a kernel image address to a hyp VA
- * reg: kernel address to be converted in place
+ * Convert a hypervisor VA to a kernel image address
+ * reg: hypervisor address to be converted in place
  * tmp: temporary register
  *
  * The actual code generation takes place in kvm_get_kimage_voffset, and
  * the instructions below are only there to reserve the space and
- * perform the register allocation (kvm_update_kimg_phys_offset uses the
+ * perform the register allocation (kvm_get_kimage_voffset uses the
  * specific registers encoded in the instructions).
  */
-.macro kimg_hyp_va reg, tmp
-alternative_cb kvm_update_kimg_phys_offset
+.macro hyp_kimg_va reg, tmp
+	/* Convert hyp VA -> PA. */
+	hyp_pa	\reg, \tmp
+
+	/* Load kimage_voffset. */
+alternative_cb kvm_get_kimage_voffset
 	movz	\tmp, #0
 	movk	\tmp, #0, lsl #16
 	movk	\tmp, #0, lsl #32
 	movk	\tmp, #0, lsl #48
 alternative_cb_end
 
-	sub	\reg, \reg, \tmp
-	mov_q	\tmp, PAGE_OFFSET
-	orr	\reg, \reg, \tmp
-	kern_hyp_va \reg
+	/* Convert PA -> kimg VA. */
+	add	\reg, \reg, \tmp
 .endm
 
 #else
diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S
index a820dfdc9c25..6585a7cbbc56 100644
--- a/arch/arm64/kvm/hyp/nvhe/host.S
+++ b/arch/arm64/kvm/hyp/nvhe/host.S
@@ -74,27 +74,28 @@ SYM_FUNC_END(__host_enter)
  * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
  */
 SYM_FUNC_START(__hyp_do_panic)
-	/* Load the format arguments into x1-7 */
-	mov	x6, x3
-	get_vcpu_ptr x7, x3
-
-	mrs	x3, esr_el2
-	mrs	x4, far_el2
-	mrs	x5, hpfar_el2
-
 	/* Prepare and exit to the host's panic funciton. */
 	mov	lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
 		      PSR_MODE_EL1h)
 	msr	spsr_el2, lr
 	ldr	lr, =panic
+	hyp_kimg_va lr, x6
 	msr	elr_el2, lr
 
-	/*
-	 * Set the panic format string and enter the host, conditionally
-	 * restoring the host context.
-	 */
+	/* Set the panic format string. Use the, now free, LR as scratch. */
+	ldr	lr, =__hyp_panic_string
+	hyp_kimg_va lr, x6
+
+	/* Load the format arguments into x1-7. */
+	mov	x6, x3
+	get_vcpu_ptr x7, x3
+	mrs	x3, esr_el2
+	mrs	x4, far_el2
+	mrs	x5, hpfar_el2
+
+	/* Enter the host, conditionally restoring the host context. */
 	cmp	x0, xzr
-	ldr	x0, =__hyp_panic_string
+	mov	x0, lr
 	b.eq	__host_enter_without_restoring
 	b	__host_enter_for_panic
 SYM_FUNC_END(__hyp_do_panic)
@@ -124,7 +125,7 @@ SYM_FUNC_END(__hyp_do_panic)
 	 * Preserve x0-x4, which may contain stub parameters.
 	 */
 	ldr	x5, =__kvm_handle_stub_hvc
-	kimg_pa x5, x6
+	hyp_pa	x5, x6
 	br	x5
 .L__vect_end\@:
 .if ((.L__vect_end\@ - .L__vect_start\@) > 0x80)
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
index 68fd64f2313e..99b408fe09ee 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -139,7 +139,6 @@ alternative_else_nop_endif
 
 	/* Set the host vector */
 	ldr	x0, =__kvm_hyp_host_vector
-	kimg_hyp_va x0, x1
 	msr	vbar_el2, x0
 
 	ret
@@ -198,7 +197,6 @@ SYM_CODE_START_LOCAL(__kvm_hyp_init_cpu)
 	/* Leave idmap. */
 	mov	x0, x29
 	ldr	x1, =kvm_host_psci_cpu_entry
-	kimg_hyp_va x1, x2
 	br	x1
 SYM_CODE_END(__kvm_hyp_init_cpu)
 
-- 
2.29.2.729.g45daf8777d-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 6/8] KVM: arm64: Fix constant-pool users in hyp
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Hyp code uses absolute addressing to obtain a kimg VA of a small number
of kernel symbols. Since the kernel now converts constant pool addresses
to hyp VAs, this trick does not work anymore.

Change the helpers to convert from hyp VA back to kimg VA or PA, as
needed and rework the callers accordingly.

Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h   | 42 ++++++++++++------------------
 arch/arm64/kvm/hyp/nvhe/host.S     | 29 +++++++++++----------
 arch/arm64/kvm/hyp/nvhe/hyp-init.S |  2 --
 3 files changed, 31 insertions(+), 42 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index 6bbb44011c84..adadc468cc71 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -73,49 +73,39 @@ alternative_cb_end
 .endm
 
 /*
- * Convert a kernel image address to a PA
- * reg: kernel address to be converted in place
+ * Convert a hypervisor VA to a PA
+ * reg: hypervisor address to be converted in place
  * tmp: temporary register
- *
- * The actual code generation takes place in kvm_get_kimage_voffset, and
- * the instructions below are only there to reserve the space and
- * perform the register allocation (kvm_get_kimage_voffset uses the
- * specific registers encoded in the instructions).
  */
-.macro kimg_pa reg, tmp
-alternative_cb kvm_get_kimage_voffset
-	movz	\tmp, #0
-	movk	\tmp, #0, lsl #16
-	movk	\tmp, #0, lsl #32
-	movk	\tmp, #0, lsl #48
-alternative_cb_end
-
-	/* reg = __pa(reg) */
-	sub	\reg, \reg, \tmp
+.macro hyp_pa reg, tmp
+	ldr_l	\tmp, hyp_physvirt_offset
+	add	\reg, \reg, \tmp
 .endm
 
 /*
- * Convert a kernel image address to a hyp VA
- * reg: kernel address to be converted in place
+ * Convert a hypervisor VA to a kernel image address
+ * reg: hypervisor address to be converted in place
  * tmp: temporary register
  *
  * The actual code generation takes place in kvm_get_kimage_voffset, and
  * the instructions below are only there to reserve the space and
- * perform the register allocation (kvm_update_kimg_phys_offset uses the
+ * perform the register allocation (kvm_get_kimage_voffset uses the
  * specific registers encoded in the instructions).
  */
-.macro kimg_hyp_va reg, tmp
-alternative_cb kvm_update_kimg_phys_offset
+.macro hyp_kimg_va reg, tmp
+	/* Convert hyp VA -> PA. */
+	hyp_pa	\reg, \tmp
+
+	/* Load kimage_voffset. */
+alternative_cb kvm_get_kimage_voffset
 	movz	\tmp, #0
 	movk	\tmp, #0, lsl #16
 	movk	\tmp, #0, lsl #32
 	movk	\tmp, #0, lsl #48
 alternative_cb_end
 
-	sub	\reg, \reg, \tmp
-	mov_q	\tmp, PAGE_OFFSET
-	orr	\reg, \reg, \tmp
-	kern_hyp_va \reg
+	/* Convert PA -> kimg VA. */
+	add	\reg, \reg, \tmp
 .endm
 
 #else
diff --git a/arch/arm64/kvm/hyp/nvhe/host.S b/arch/arm64/kvm/hyp/nvhe/host.S
index a820dfdc9c25..6585a7cbbc56 100644
--- a/arch/arm64/kvm/hyp/nvhe/host.S
+++ b/arch/arm64/kvm/hyp/nvhe/host.S
@@ -74,27 +74,28 @@ SYM_FUNC_END(__host_enter)
  * void __noreturn __hyp_do_panic(bool restore_host, u64 spsr, u64 elr, u64 par);
  */
 SYM_FUNC_START(__hyp_do_panic)
-	/* Load the format arguments into x1-7 */
-	mov	x6, x3
-	get_vcpu_ptr x7, x3
-
-	mrs	x3, esr_el2
-	mrs	x4, far_el2
-	mrs	x5, hpfar_el2
-
 	/* Prepare and exit to the host's panic funciton. */
 	mov	lr, #(PSR_F_BIT | PSR_I_BIT | PSR_A_BIT | PSR_D_BIT |\
 		      PSR_MODE_EL1h)
 	msr	spsr_el2, lr
 	ldr	lr, =panic
+	hyp_kimg_va lr, x6
 	msr	elr_el2, lr
 
-	/*
-	 * Set the panic format string and enter the host, conditionally
-	 * restoring the host context.
-	 */
+	/* Set the panic format string. Use the, now free, LR as scratch. */
+	ldr	lr, =__hyp_panic_string
+	hyp_kimg_va lr, x6
+
+	/* Load the format arguments into x1-7. */
+	mov	x6, x3
+	get_vcpu_ptr x7, x3
+	mrs	x3, esr_el2
+	mrs	x4, far_el2
+	mrs	x5, hpfar_el2
+
+	/* Enter the host, conditionally restoring the host context. */
 	cmp	x0, xzr
-	ldr	x0, =__hyp_panic_string
+	mov	x0, lr
 	b.eq	__host_enter_without_restoring
 	b	__host_enter_for_panic
 SYM_FUNC_END(__hyp_do_panic)
@@ -124,7 +125,7 @@ SYM_FUNC_END(__hyp_do_panic)
 	 * Preserve x0-x4, which may contain stub parameters.
 	 */
 	ldr	x5, =__kvm_handle_stub_hvc
-	kimg_pa x5, x6
+	hyp_pa	x5, x6
 	br	x5
 .L__vect_end\@:
 .if ((.L__vect_end\@ - .L__vect_start\@) > 0x80)
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
index 68fd64f2313e..99b408fe09ee 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S
@@ -139,7 +139,6 @@ alternative_else_nop_endif
 
 	/* Set the host vector */
 	ldr	x0, =__kvm_hyp_host_vector
-	kimg_hyp_va x0, x1
 	msr	vbar_el2, x0
 
 	ret
@@ -198,7 +197,6 @@ SYM_CODE_START_LOCAL(__kvm_hyp_init_cpu)
 	/* Leave idmap. */
 	mov	x0, x29
 	ldr	x1, =kvm_host_psci_cpu_entry
-	kimg_hyp_va x1, x2
 	br	x1
 SYM_CODE_END(__kvm_hyp_init_cpu)
 
-- 
2.29.2.729.g45daf8777d-goog


_______________________________________________
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] 57+ messages in thread
* [PATCH v2 7/8] KVM: arm64: Remove patching of fn pointers in hyp
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-05 18:05   ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

Storing a function pointer in hyp now generates relocation information
used at early boot to convert the address to hyp VA. The existing
alternative-based conversion mechanism is therefore obsolete. Remove it
and simplify its users.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h   | 18 ------------------
 arch/arm64/kernel/image-vars.h     |  1 -
 arch/arm64/kvm/hyp/nvhe/hyp-main.c | 11 ++++-------
 arch/arm64/kvm/va_layout.c         |  6 ------
 4 files changed, 4 insertions(+), 32 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index adadc468cc71..90873851f677 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -135,24 +135,6 @@ static __always_inline unsigned long __kern_hyp_va(unsigned long v)
 
 #define kern_hyp_va(v) 	((typeof(v))(__kern_hyp_va((unsigned long)(v))))
 
-static __always_inline unsigned long __kimg_hyp_va(unsigned long v)
-{
-	unsigned long offset;
-
-	asm volatile(ALTERNATIVE_CB("movz %0, #0\n"
-				    "movk %0, #0, lsl #16\n"
-				    "movk %0, #0, lsl #32\n"
-				    "movk %0, #0, lsl #48\n",
-				    kvm_update_kimg_phys_offset)
-		     : "=r" (offset));
-
-	return __kern_hyp_va((v - offset) | PAGE_OFFSET);
-}
-
-#define kimg_fn_hyp_va(v) 	((typeof(*v))(__kimg_hyp_va((unsigned long)(v))))
-
-#define kimg_fn_ptr(x)	(typeof(x) **)(x)
-
 /*
  * We currently support using a VM-specified IPA size. For backward
  * compatibility, the default IPA size is fixed to 40bits.
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index f676243abac6..23f1a557bd9f 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -64,7 +64,6 @@ __efistub__ctype		= _ctype;
 /* Alternative callbacks for init-time patching of nVHE hyp code. */
 KVM_NVHE_ALIAS(kvm_patch_vector_branch);
 KVM_NVHE_ALIAS(kvm_update_va_mask);
-KVM_NVHE_ALIAS(kvm_update_kimg_phys_offset);
 KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
 
 /* Global kernel state accessed by nVHE hyp code. */
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index a906f9e2ff34..f012f8665ecc 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -108,9 +108,9 @@ static void handle___vgic_v3_restore_aprs(struct kvm_cpu_context *host_ctxt)
 
 typedef void (*hcall_t)(struct kvm_cpu_context *);
 
-#define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = kimg_fn_ptr(handle_##x)
+#define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x
 
-static const hcall_t *host_hcall[] = {
+static const hcall_t host_hcall[] = {
 	HANDLE_FUNC(__kvm_vcpu_run),
 	HANDLE_FUNC(__kvm_flush_vm_context),
 	HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa),
@@ -130,7 +130,6 @@ static const hcall_t *host_hcall[] = {
 static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
 {
 	DECLARE_REG(unsigned long, id, host_ctxt, 0);
-	const hcall_t *kfn;
 	hcall_t hfn;
 
 	id -= KVM_HOST_SMCCC_ID(0);
@@ -138,13 +137,11 @@ static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
 	if (unlikely(id >= ARRAY_SIZE(host_hcall)))
 		goto inval;
 
-	kfn = host_hcall[id];
-	if (unlikely(!kfn))
+	hfn = host_hcall[id];
+	if (unlikely(!hfn))
 		goto inval;
 
 	cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS;
-
-	hfn = kimg_fn_hyp_va(kfn);
 	hfn(host_ctxt);
 
 	return;
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index fee7dcd95d73..978301392d67 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -283,12 +283,6 @@ static void generate_mov_q(u64 val, __le32 *origptr, __le32 *updptr, int nr_inst
 	*updptr++ = cpu_to_le32(insn);
 }
 
-void kvm_update_kimg_phys_offset(struct alt_instr *alt,
-				 __le32 *origptr, __le32 *updptr, int nr_inst)
-{
-	generate_mov_q(kimage_voffset + PHYS_OFFSET, origptr, updptr, nr_inst);
-}
-
 void kvm_get_kimage_voffset(struct alt_instr *alt,
 			    __le32 *origptr, __le32 *updptr, int nr_inst)
 {
-- 
2.29.2.729.g45daf8777d-goog


^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 7/8] KVM: arm64: Remove patching of fn pointers in hyp
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

Storing a function pointer in hyp now generates relocation information
used at early boot to convert the address to hyp VA. The existing
alternative-based conversion mechanism is therefore obsolete. Remove it
and simplify its users.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h   | 18 ------------------
 arch/arm64/kernel/image-vars.h     |  1 -
 arch/arm64/kvm/hyp/nvhe/hyp-main.c | 11 ++++-------
 arch/arm64/kvm/va_layout.c         |  6 ------
 4 files changed, 4 insertions(+), 32 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index adadc468cc71..90873851f677 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -135,24 +135,6 @@ static __always_inline unsigned long __kern_hyp_va(unsigned long v)
 
 #define kern_hyp_va(v) 	((typeof(v))(__kern_hyp_va((unsigned long)(v))))
 
-static __always_inline unsigned long __kimg_hyp_va(unsigned long v)
-{
-	unsigned long offset;
-
-	asm volatile(ALTERNATIVE_CB("movz %0, #0\n"
-				    "movk %0, #0, lsl #16\n"
-				    "movk %0, #0, lsl #32\n"
-				    "movk %0, #0, lsl #48\n",
-				    kvm_update_kimg_phys_offset)
-		     : "=r" (offset));
-
-	return __kern_hyp_va((v - offset) | PAGE_OFFSET);
-}
-
-#define kimg_fn_hyp_va(v) 	((typeof(*v))(__kimg_hyp_va((unsigned long)(v))))
-
-#define kimg_fn_ptr(x)	(typeof(x) **)(x)
-
 /*
  * We currently support using a VM-specified IPA size. For backward
  * compatibility, the default IPA size is fixed to 40bits.
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index f676243abac6..23f1a557bd9f 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -64,7 +64,6 @@ __efistub__ctype		= _ctype;
 /* Alternative callbacks for init-time patching of nVHE hyp code. */
 KVM_NVHE_ALIAS(kvm_patch_vector_branch);
 KVM_NVHE_ALIAS(kvm_update_va_mask);
-KVM_NVHE_ALIAS(kvm_update_kimg_phys_offset);
 KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
 
 /* Global kernel state accessed by nVHE hyp code. */
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index a906f9e2ff34..f012f8665ecc 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -108,9 +108,9 @@ static void handle___vgic_v3_restore_aprs(struct kvm_cpu_context *host_ctxt)
 
 typedef void (*hcall_t)(struct kvm_cpu_context *);
 
-#define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = kimg_fn_ptr(handle_##x)
+#define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x
 
-static const hcall_t *host_hcall[] = {
+static const hcall_t host_hcall[] = {
 	HANDLE_FUNC(__kvm_vcpu_run),
 	HANDLE_FUNC(__kvm_flush_vm_context),
 	HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa),
@@ -130,7 +130,6 @@ static const hcall_t *host_hcall[] = {
 static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
 {
 	DECLARE_REG(unsigned long, id, host_ctxt, 0);
-	const hcall_t *kfn;
 	hcall_t hfn;
 
 	id -= KVM_HOST_SMCCC_ID(0);
@@ -138,13 +137,11 @@ static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
 	if (unlikely(id >= ARRAY_SIZE(host_hcall)))
 		goto inval;
 
-	kfn = host_hcall[id];
-	if (unlikely(!kfn))
+	hfn = host_hcall[id];
+	if (unlikely(!hfn))
 		goto inval;
 
 	cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS;
-
-	hfn = kimg_fn_hyp_va(kfn);
 	hfn(host_ctxt);
 
 	return;
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index fee7dcd95d73..978301392d67 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -283,12 +283,6 @@ static void generate_mov_q(u64 val, __le32 *origptr, __le32 *updptr, int nr_inst
 	*updptr++ = cpu_to_le32(insn);
 }
 
-void kvm_update_kimg_phys_offset(struct alt_instr *alt,
-				 __le32 *origptr, __le32 *updptr, int nr_inst)
-{
-	generate_mov_q(kimage_voffset + PHYS_OFFSET, origptr, updptr, nr_inst);
-}
-
 void kvm_get_kimage_voffset(struct alt_instr *alt,
 			    __le32 *origptr, __le32 *updptr, int nr_inst)
 {
-- 
2.29.2.729.g45daf8777d-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 7/8] KVM: arm64: Remove patching of fn pointers in hyp
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Storing a function pointer in hyp now generates relocation information
used at early boot to convert the address to hyp VA. The existing
alternative-based conversion mechanism is therefore obsolete. Remove it
and simplify its users.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_mmu.h   | 18 ------------------
 arch/arm64/kernel/image-vars.h     |  1 -
 arch/arm64/kvm/hyp/nvhe/hyp-main.c | 11 ++++-------
 arch/arm64/kvm/va_layout.c         |  6 ------
 4 files changed, 4 insertions(+), 32 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h
index adadc468cc71..90873851f677 100644
--- a/arch/arm64/include/asm/kvm_mmu.h
+++ b/arch/arm64/include/asm/kvm_mmu.h
@@ -135,24 +135,6 @@ static __always_inline unsigned long __kern_hyp_va(unsigned long v)
 
 #define kern_hyp_va(v) 	((typeof(v))(__kern_hyp_va((unsigned long)(v))))
 
-static __always_inline unsigned long __kimg_hyp_va(unsigned long v)
-{
-	unsigned long offset;
-
-	asm volatile(ALTERNATIVE_CB("movz %0, #0\n"
-				    "movk %0, #0, lsl #16\n"
-				    "movk %0, #0, lsl #32\n"
-				    "movk %0, #0, lsl #48\n",
-				    kvm_update_kimg_phys_offset)
-		     : "=r" (offset));
-
-	return __kern_hyp_va((v - offset) | PAGE_OFFSET);
-}
-
-#define kimg_fn_hyp_va(v) 	((typeof(*v))(__kimg_hyp_va((unsigned long)(v))))
-
-#define kimg_fn_ptr(x)	(typeof(x) **)(x)
-
 /*
  * We currently support using a VM-specified IPA size. For backward
  * compatibility, the default IPA size is fixed to 40bits.
diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
index f676243abac6..23f1a557bd9f 100644
--- a/arch/arm64/kernel/image-vars.h
+++ b/arch/arm64/kernel/image-vars.h
@@ -64,7 +64,6 @@ __efistub__ctype		= _ctype;
 /* Alternative callbacks for init-time patching of nVHE hyp code. */
 KVM_NVHE_ALIAS(kvm_patch_vector_branch);
 KVM_NVHE_ALIAS(kvm_update_va_mask);
-KVM_NVHE_ALIAS(kvm_update_kimg_phys_offset);
 KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
 
 /* Global kernel state accessed by nVHE hyp code. */
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index a906f9e2ff34..f012f8665ecc 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -108,9 +108,9 @@ static void handle___vgic_v3_restore_aprs(struct kvm_cpu_context *host_ctxt)
 
 typedef void (*hcall_t)(struct kvm_cpu_context *);
 
-#define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = kimg_fn_ptr(handle_##x)
+#define HANDLE_FUNC(x)	[__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x
 
-static const hcall_t *host_hcall[] = {
+static const hcall_t host_hcall[] = {
 	HANDLE_FUNC(__kvm_vcpu_run),
 	HANDLE_FUNC(__kvm_flush_vm_context),
 	HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa),
@@ -130,7 +130,6 @@ static const hcall_t *host_hcall[] = {
 static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
 {
 	DECLARE_REG(unsigned long, id, host_ctxt, 0);
-	const hcall_t *kfn;
 	hcall_t hfn;
 
 	id -= KVM_HOST_SMCCC_ID(0);
@@ -138,13 +137,11 @@ static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
 	if (unlikely(id >= ARRAY_SIZE(host_hcall)))
 		goto inval;
 
-	kfn = host_hcall[id];
-	if (unlikely(!kfn))
+	hfn = host_hcall[id];
+	if (unlikely(!hfn))
 		goto inval;
 
 	cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS;
-
-	hfn = kimg_fn_hyp_va(kfn);
 	hfn(host_ctxt);
 
 	return;
diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
index fee7dcd95d73..978301392d67 100644
--- a/arch/arm64/kvm/va_layout.c
+++ b/arch/arm64/kvm/va_layout.c
@@ -283,12 +283,6 @@ static void generate_mov_q(u64 val, __le32 *origptr, __le32 *updptr, int nr_inst
 	*updptr++ = cpu_to_le32(insn);
 }
 
-void kvm_update_kimg_phys_offset(struct alt_instr *alt,
-				 __le32 *origptr, __le32 *updptr, int nr_inst)
-{
-	generate_mov_q(kimage_voffset + PHYS_OFFSET, origptr, updptr, nr_inst);
-}
-
 void kvm_get_kimage_voffset(struct alt_instr *alt,
 			    __le32 *origptr, __le32 *updptr, int nr_inst)
 {
-- 
2.29.2.729.g45daf8777d-goog


_______________________________________________
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] 57+ messages in thread
* [PATCH v2 8/8] KVM: arm64: Remove hyp_symbol_addr
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-05 18:05   ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, Will Deacon, Marc Zyngier, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel, David Brazdil

Hyp code used the hyp_symbol_addr helper to force PC-relative addressing
because absolute addressing results in kernel VAs due to the way hyp
code is linked. This is not true anymore, so remove the helper and
update all of its users.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_asm.h         | 26 ------------------------
 arch/arm64/kvm/hyp/include/hyp/switch.h  |  4 ++--
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |  4 ++--
 arch/arm64/kvm/hyp/nvhe/psci-relay.c     | 24 +++++++++++-----------
 arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |  2 +-
 5 files changed, 17 insertions(+), 43 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 8a33d83ea843..22d933e9b59e 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -199,32 +199,6 @@ extern void __vgic_v3_init_lrs(void);
 
 extern u32 __kvm_get_mdcr_el2(void);
 
-#if defined(GCC_VERSION) && GCC_VERSION < 50000
-#define SYM_CONSTRAINT	"i"
-#else
-#define SYM_CONSTRAINT	"S"
-#endif
-
-/*
- * Obtain the PC-relative address of a kernel symbol
- * s: symbol
- *
- * The goal of this macro is to return a symbol's address based on a
- * PC-relative computation, as opposed to a loading the VA from a
- * constant pool or something similar. This works well for HYP, as an
- * absolute VA is guaranteed to be wrong. Only use this if trying to
- * obtain the address of a symbol (i.e. not something you obtained by
- * following a pointer).
- */
-#define hyp_symbol_addr(s)						\
-	({								\
-		typeof(s) *addr;					\
-		asm("adrp	%0, %1\n"				\
-		    "add	%0, %0, :lo12:%1\n"			\
-		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
-		addr;							\
-	})
-
 #define __KVM_EXTABLE(from, to)						\
 	"	.pushsection	__kvm_ex_table, \"a\"\n"		\
 	"	.align		3\n"					\
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 84473574c2e7..54f4860cd87c 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -505,8 +505,8 @@ static inline void __kvm_unexpected_el2_exception(void)
 	struct exception_table_entry *entry, *end;
 	unsigned long elr_el2 = read_sysreg(elr_el2);
 
-	entry = hyp_symbol_addr(__start___kvm_ex_table);
-	end = hyp_symbol_addr(__stop___kvm_ex_table);
+	entry = &__start___kvm_ex_table;
+	end = &__stop___kvm_ex_table;
 
 	while (entry < end) {
 		addr = (unsigned long)&entry->insn + entry->insn;
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
index 2997aa156d8e..879559057dee 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
@@ -33,8 +33,8 @@ unsigned long __hyp_per_cpu_offset(unsigned int cpu)
 	if (cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base))
 		hyp_panic();
 
-	cpu_base_array = (unsigned long *)hyp_symbol_addr(kvm_arm_hyp_percpu_base);
+	cpu_base_array = (unsigned long *)&kvm_arm_hyp_percpu_base;
 	this_cpu_base = kern_hyp_va(cpu_base_array[cpu]);
-	elf_base = (unsigned long)hyp_symbol_addr(__per_cpu_start);
+	elf_base = (unsigned long)&__per_cpu_start;
 	return this_cpu_base - elf_base;
 }
diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
index e3947846ffcb..f254a425cb3a 100644
--- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c
+++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
@@ -134,8 +134,8 @@ static int psci_cpu_on(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	if (cpu_id == INVALID_CPU_ID)
 		return PSCI_RET_INVALID_PARAMS;
 
-	boot_args = per_cpu_ptr(hyp_symbol_addr(cpu_on_args), cpu_id);
-	init_params = per_cpu_ptr(hyp_symbol_addr(kvm_init_params), cpu_id);
+	boot_args = per_cpu_ptr(&cpu_on_args, cpu_id);
+	init_params = per_cpu_ptr(&kvm_init_params, cpu_id);
 
 	/* Check if the target CPU is already being booted. */
 	if (!try_acquire_boot_args(boot_args))
@@ -146,7 +146,7 @@ static int psci_cpu_on(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	wmb();
 
 	ret = psci_call(func_id, mpidr,
-			__hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_entry)),
+			__hyp_pa(&kvm_hyp_cpu_entry),
 			__hyp_pa(init_params));
 
 	/* If successful, the lock will be released by the target CPU. */
@@ -165,8 +165,8 @@ static int psci_cpu_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	struct psci_boot_args *boot_args;
 	struct kvm_nvhe_init_params *init_params;
 
-	boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
-	init_params = this_cpu_ptr(hyp_symbol_addr(kvm_init_params));
+	boot_args = this_cpu_ptr(&suspend_args);
+	init_params = this_cpu_ptr(&kvm_init_params);
 
 	/*
 	 * No need to acquire a lock before writing to boot_args because a core
@@ -180,7 +180,7 @@ static int psci_cpu_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	 * point if it is a deep sleep state.
 	 */
 	return psci_call(func_id, power_state,
-			 __hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_resume)),
+			 __hyp_pa(&kvm_hyp_cpu_resume),
 			 __hyp_pa(init_params));
 }
 
@@ -192,8 +192,8 @@ static int psci_system_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	struct psci_boot_args *boot_args;
 	struct kvm_nvhe_init_params *init_params;
 
-	boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
-	init_params = this_cpu_ptr(hyp_symbol_addr(kvm_init_params));
+	boot_args = this_cpu_ptr(&suspend_args);
+	init_params = this_cpu_ptr(&kvm_init_params);
 
 	/*
 	 * No need to acquire a lock before writing to boot_args because a core
@@ -204,7 +204,7 @@ static int psci_system_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 
 	/* Will only return on error. */
 	return psci_call(func_id,
-			 __hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_resume)),
+			 __hyp_pa(&kvm_hyp_cpu_resume),
 			 __hyp_pa(init_params), 0);
 }
 
@@ -213,12 +213,12 @@ asmlinkage void __noreturn kvm_host_psci_cpu_entry(bool is_cpu_on)
 	struct psci_boot_args *boot_args;
 	struct kvm_cpu_context *host_ctxt;
 
-	host_ctxt = &this_cpu_ptr(hyp_symbol_addr(kvm_host_data))->host_ctxt;
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
 
 	if (is_cpu_on)
-		boot_args = this_cpu_ptr(hyp_symbol_addr(cpu_on_args));
+		boot_args = this_cpu_ptr(&cpu_on_args);
 	else
-		boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
+		boot_args = this_cpu_ptr(&suspend_args);
 
 	cpu_reg(host_ctxt, 0) = boot_args->r0;
 	write_sysreg_el2(boot_args->pc, SYS_ELR);
diff --git a/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
index 8f0585640241..87a54375bd6e 100644
--- a/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
+++ b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
@@ -64,7 +64,7 @@ int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
 	}
 
 	rd = kvm_vcpu_dabt_get_rd(vcpu);
-	addr  = hyp_symbol_addr(kvm_vgic_global_state)->vcpu_hyp_va;
+	addr  = kvm_vgic_global_state.vcpu_hyp_va;
 	addr += fault_ipa - vgic->vgic_cpu_base;
 
 	if (kvm_vcpu_dabt_iswrite(vcpu)) {
-- 
2.29.2.729.g45daf8777d-goog


^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 8/8] KVM: arm64: Remove hyp_symbol_addr
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Catalin Marinas, linux-kernel, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel

Hyp code used the hyp_symbol_addr helper to force PC-relative addressing
because absolute addressing results in kernel VAs due to the way hyp
code is linked. This is not true anymore, so remove the helper and
update all of its users.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_asm.h         | 26 ------------------------
 arch/arm64/kvm/hyp/include/hyp/switch.h  |  4 ++--
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |  4 ++--
 arch/arm64/kvm/hyp/nvhe/psci-relay.c     | 24 +++++++++++-----------
 arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |  2 +-
 5 files changed, 17 insertions(+), 43 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 8a33d83ea843..22d933e9b59e 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -199,32 +199,6 @@ extern void __vgic_v3_init_lrs(void);
 
 extern u32 __kvm_get_mdcr_el2(void);
 
-#if defined(GCC_VERSION) && GCC_VERSION < 50000
-#define SYM_CONSTRAINT	"i"
-#else
-#define SYM_CONSTRAINT	"S"
-#endif
-
-/*
- * Obtain the PC-relative address of a kernel symbol
- * s: symbol
- *
- * The goal of this macro is to return a symbol's address based on a
- * PC-relative computation, as opposed to a loading the VA from a
- * constant pool or something similar. This works well for HYP, as an
- * absolute VA is guaranteed to be wrong. Only use this if trying to
- * obtain the address of a symbol (i.e. not something you obtained by
- * following a pointer).
- */
-#define hyp_symbol_addr(s)						\
-	({								\
-		typeof(s) *addr;					\
-		asm("adrp	%0, %1\n"				\
-		    "add	%0, %0, :lo12:%1\n"			\
-		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
-		addr;							\
-	})
-
 #define __KVM_EXTABLE(from, to)						\
 	"	.pushsection	__kvm_ex_table, \"a\"\n"		\
 	"	.align		3\n"					\
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 84473574c2e7..54f4860cd87c 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -505,8 +505,8 @@ static inline void __kvm_unexpected_el2_exception(void)
 	struct exception_table_entry *entry, *end;
 	unsigned long elr_el2 = read_sysreg(elr_el2);
 
-	entry = hyp_symbol_addr(__start___kvm_ex_table);
-	end = hyp_symbol_addr(__stop___kvm_ex_table);
+	entry = &__start___kvm_ex_table;
+	end = &__stop___kvm_ex_table;
 
 	while (entry < end) {
 		addr = (unsigned long)&entry->insn + entry->insn;
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
index 2997aa156d8e..879559057dee 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
@@ -33,8 +33,8 @@ unsigned long __hyp_per_cpu_offset(unsigned int cpu)
 	if (cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base))
 		hyp_panic();
 
-	cpu_base_array = (unsigned long *)hyp_symbol_addr(kvm_arm_hyp_percpu_base);
+	cpu_base_array = (unsigned long *)&kvm_arm_hyp_percpu_base;
 	this_cpu_base = kern_hyp_va(cpu_base_array[cpu]);
-	elf_base = (unsigned long)hyp_symbol_addr(__per_cpu_start);
+	elf_base = (unsigned long)&__per_cpu_start;
 	return this_cpu_base - elf_base;
 }
diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
index e3947846ffcb..f254a425cb3a 100644
--- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c
+++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
@@ -134,8 +134,8 @@ static int psci_cpu_on(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	if (cpu_id == INVALID_CPU_ID)
 		return PSCI_RET_INVALID_PARAMS;
 
-	boot_args = per_cpu_ptr(hyp_symbol_addr(cpu_on_args), cpu_id);
-	init_params = per_cpu_ptr(hyp_symbol_addr(kvm_init_params), cpu_id);
+	boot_args = per_cpu_ptr(&cpu_on_args, cpu_id);
+	init_params = per_cpu_ptr(&kvm_init_params, cpu_id);
 
 	/* Check if the target CPU is already being booted. */
 	if (!try_acquire_boot_args(boot_args))
@@ -146,7 +146,7 @@ static int psci_cpu_on(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	wmb();
 
 	ret = psci_call(func_id, mpidr,
-			__hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_entry)),
+			__hyp_pa(&kvm_hyp_cpu_entry),
 			__hyp_pa(init_params));
 
 	/* If successful, the lock will be released by the target CPU. */
@@ -165,8 +165,8 @@ static int psci_cpu_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	struct psci_boot_args *boot_args;
 	struct kvm_nvhe_init_params *init_params;
 
-	boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
-	init_params = this_cpu_ptr(hyp_symbol_addr(kvm_init_params));
+	boot_args = this_cpu_ptr(&suspend_args);
+	init_params = this_cpu_ptr(&kvm_init_params);
 
 	/*
 	 * No need to acquire a lock before writing to boot_args because a core
@@ -180,7 +180,7 @@ static int psci_cpu_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	 * point if it is a deep sleep state.
 	 */
 	return psci_call(func_id, power_state,
-			 __hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_resume)),
+			 __hyp_pa(&kvm_hyp_cpu_resume),
 			 __hyp_pa(init_params));
 }
 
@@ -192,8 +192,8 @@ static int psci_system_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	struct psci_boot_args *boot_args;
 	struct kvm_nvhe_init_params *init_params;
 
-	boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
-	init_params = this_cpu_ptr(hyp_symbol_addr(kvm_init_params));
+	boot_args = this_cpu_ptr(&suspend_args);
+	init_params = this_cpu_ptr(&kvm_init_params);
 
 	/*
 	 * No need to acquire a lock before writing to boot_args because a core
@@ -204,7 +204,7 @@ static int psci_system_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 
 	/* Will only return on error. */
 	return psci_call(func_id,
-			 __hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_resume)),
+			 __hyp_pa(&kvm_hyp_cpu_resume),
 			 __hyp_pa(init_params), 0);
 }
 
@@ -213,12 +213,12 @@ asmlinkage void __noreturn kvm_host_psci_cpu_entry(bool is_cpu_on)
 	struct psci_boot_args *boot_args;
 	struct kvm_cpu_context *host_ctxt;
 
-	host_ctxt = &this_cpu_ptr(hyp_symbol_addr(kvm_host_data))->host_ctxt;
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
 
 	if (is_cpu_on)
-		boot_args = this_cpu_ptr(hyp_symbol_addr(cpu_on_args));
+		boot_args = this_cpu_ptr(&cpu_on_args);
 	else
-		boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
+		boot_args = this_cpu_ptr(&suspend_args);
 
 	cpu_reg(host_ctxt, 0) = boot_args->r0;
 	write_sysreg_el2(boot_args->pc, SYS_ELR);
diff --git a/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
index 8f0585640241..87a54375bd6e 100644
--- a/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
+++ b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
@@ -64,7 +64,7 @@ int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
 	}
 
 	rd = kvm_vcpu_dabt_get_rd(vcpu);
-	addr  = hyp_symbol_addr(kvm_vgic_global_state)->vcpu_hyp_va;
+	addr  = kvm_vgic_global_state.vcpu_hyp_va;
 	addr += fault_ipa - vgic->vgic_cpu_base;
 
 	if (kvm_vcpu_dabt_iswrite(vcpu)) {
-- 
2.29.2.729.g45daf8777d-goog

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* [PATCH v2 8/8] KVM: arm64: Remove hyp_symbol_addr
@ 2021-01-05 18:05   ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-01-05 18:05 UTC (permalink / raw)
  To: kvmarm
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	James Morse, linux-arm-kernel, Marc Zyngier, David Brazdil,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Hyp code used the hyp_symbol_addr helper to force PC-relative addressing
because absolute addressing results in kernel VAs due to the way hyp
code is linked. This is not true anymore, so remove the helper and
update all of its users.

Acked-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: David Brazdil <dbrazdil@google.com>
---
 arch/arm64/include/asm/kvm_asm.h         | 26 ------------------------
 arch/arm64/kvm/hyp/include/hyp/switch.h  |  4 ++--
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |  4 ++--
 arch/arm64/kvm/hyp/nvhe/psci-relay.c     | 24 +++++++++++-----------
 arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |  2 +-
 5 files changed, 17 insertions(+), 43 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
index 8a33d83ea843..22d933e9b59e 100644
--- a/arch/arm64/include/asm/kvm_asm.h
+++ b/arch/arm64/include/asm/kvm_asm.h
@@ -199,32 +199,6 @@ extern void __vgic_v3_init_lrs(void);
 
 extern u32 __kvm_get_mdcr_el2(void);
 
-#if defined(GCC_VERSION) && GCC_VERSION < 50000
-#define SYM_CONSTRAINT	"i"
-#else
-#define SYM_CONSTRAINT	"S"
-#endif
-
-/*
- * Obtain the PC-relative address of a kernel symbol
- * s: symbol
- *
- * The goal of this macro is to return a symbol's address based on a
- * PC-relative computation, as opposed to a loading the VA from a
- * constant pool or something similar. This works well for HYP, as an
- * absolute VA is guaranteed to be wrong. Only use this if trying to
- * obtain the address of a symbol (i.e. not something you obtained by
- * following a pointer).
- */
-#define hyp_symbol_addr(s)						\
-	({								\
-		typeof(s) *addr;					\
-		asm("adrp	%0, %1\n"				\
-		    "add	%0, %0, :lo12:%1\n"			\
-		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
-		addr;							\
-	})
-
 #define __KVM_EXTABLE(from, to)						\
 	"	.pushsection	__kvm_ex_table, \"a\"\n"		\
 	"	.align		3\n"					\
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 84473574c2e7..54f4860cd87c 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -505,8 +505,8 @@ static inline void __kvm_unexpected_el2_exception(void)
 	struct exception_table_entry *entry, *end;
 	unsigned long elr_el2 = read_sysreg(elr_el2);
 
-	entry = hyp_symbol_addr(__start___kvm_ex_table);
-	end = hyp_symbol_addr(__stop___kvm_ex_table);
+	entry = &__start___kvm_ex_table;
+	end = &__stop___kvm_ex_table;
 
 	while (entry < end) {
 		addr = (unsigned long)&entry->insn + entry->insn;
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
index 2997aa156d8e..879559057dee 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
@@ -33,8 +33,8 @@ unsigned long __hyp_per_cpu_offset(unsigned int cpu)
 	if (cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base))
 		hyp_panic();
 
-	cpu_base_array = (unsigned long *)hyp_symbol_addr(kvm_arm_hyp_percpu_base);
+	cpu_base_array = (unsigned long *)&kvm_arm_hyp_percpu_base;
 	this_cpu_base = kern_hyp_va(cpu_base_array[cpu]);
-	elf_base = (unsigned long)hyp_symbol_addr(__per_cpu_start);
+	elf_base = (unsigned long)&__per_cpu_start;
 	return this_cpu_base - elf_base;
 }
diff --git a/arch/arm64/kvm/hyp/nvhe/psci-relay.c b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
index e3947846ffcb..f254a425cb3a 100644
--- a/arch/arm64/kvm/hyp/nvhe/psci-relay.c
+++ b/arch/arm64/kvm/hyp/nvhe/psci-relay.c
@@ -134,8 +134,8 @@ static int psci_cpu_on(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	if (cpu_id == INVALID_CPU_ID)
 		return PSCI_RET_INVALID_PARAMS;
 
-	boot_args = per_cpu_ptr(hyp_symbol_addr(cpu_on_args), cpu_id);
-	init_params = per_cpu_ptr(hyp_symbol_addr(kvm_init_params), cpu_id);
+	boot_args = per_cpu_ptr(&cpu_on_args, cpu_id);
+	init_params = per_cpu_ptr(&kvm_init_params, cpu_id);
 
 	/* Check if the target CPU is already being booted. */
 	if (!try_acquire_boot_args(boot_args))
@@ -146,7 +146,7 @@ static int psci_cpu_on(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	wmb();
 
 	ret = psci_call(func_id, mpidr,
-			__hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_entry)),
+			__hyp_pa(&kvm_hyp_cpu_entry),
 			__hyp_pa(init_params));
 
 	/* If successful, the lock will be released by the target CPU. */
@@ -165,8 +165,8 @@ static int psci_cpu_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	struct psci_boot_args *boot_args;
 	struct kvm_nvhe_init_params *init_params;
 
-	boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
-	init_params = this_cpu_ptr(hyp_symbol_addr(kvm_init_params));
+	boot_args = this_cpu_ptr(&suspend_args);
+	init_params = this_cpu_ptr(&kvm_init_params);
 
 	/*
 	 * No need to acquire a lock before writing to boot_args because a core
@@ -180,7 +180,7 @@ static int psci_cpu_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	 * point if it is a deep sleep state.
 	 */
 	return psci_call(func_id, power_state,
-			 __hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_resume)),
+			 __hyp_pa(&kvm_hyp_cpu_resume),
 			 __hyp_pa(init_params));
 }
 
@@ -192,8 +192,8 @@ static int psci_system_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 	struct psci_boot_args *boot_args;
 	struct kvm_nvhe_init_params *init_params;
 
-	boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
-	init_params = this_cpu_ptr(hyp_symbol_addr(kvm_init_params));
+	boot_args = this_cpu_ptr(&suspend_args);
+	init_params = this_cpu_ptr(&kvm_init_params);
 
 	/*
 	 * No need to acquire a lock before writing to boot_args because a core
@@ -204,7 +204,7 @@ static int psci_system_suspend(u64 func_id, struct kvm_cpu_context *host_ctxt)
 
 	/* Will only return on error. */
 	return psci_call(func_id,
-			 __hyp_pa(hyp_symbol_addr(kvm_hyp_cpu_resume)),
+			 __hyp_pa(&kvm_hyp_cpu_resume),
 			 __hyp_pa(init_params), 0);
 }
 
@@ -213,12 +213,12 @@ asmlinkage void __noreturn kvm_host_psci_cpu_entry(bool is_cpu_on)
 	struct psci_boot_args *boot_args;
 	struct kvm_cpu_context *host_ctxt;
 
-	host_ctxt = &this_cpu_ptr(hyp_symbol_addr(kvm_host_data))->host_ctxt;
+	host_ctxt = &this_cpu_ptr(&kvm_host_data)->host_ctxt;
 
 	if (is_cpu_on)
-		boot_args = this_cpu_ptr(hyp_symbol_addr(cpu_on_args));
+		boot_args = this_cpu_ptr(&cpu_on_args);
 	else
-		boot_args = this_cpu_ptr(hyp_symbol_addr(suspend_args));
+		boot_args = this_cpu_ptr(&suspend_args);
 
 	cpu_reg(host_ctxt, 0) = boot_args->r0;
 	write_sysreg_el2(boot_args->pc, SYS_ELR);
diff --git a/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
index 8f0585640241..87a54375bd6e 100644
--- a/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
+++ b/arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c
@@ -64,7 +64,7 @@ int __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu)
 	}
 
 	rd = kvm_vcpu_dabt_get_rd(vcpu);
-	addr  = hyp_symbol_addr(kvm_vgic_global_state)->vcpu_hyp_va;
+	addr  = kvm_vgic_global_state.vcpu_hyp_va;
 	addr += fault_ipa - vgic->vgic_cpu_base;
 
 	if (kvm_vcpu_dabt_iswrite(vcpu)) {
-- 
2.29.2.729.g45daf8777d-goog


_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 3/8] KVM: arm64: Add symbol at the beginning of each hyp section
  2021-01-05 18:05   ` David Brazdil
  (?)
@ 2021-01-23 13:30     ` Marc Zyngier
  -1 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 13:30 UTC (permalink / raw)
  To: David Brazdil
  Cc: kvmarm, Catalin Marinas, Will Deacon, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel

On Tue, 05 Jan 2021 18:05:36 +0000,
David Brazdil <dbrazdil@google.com> wrote:
> 
> Generating hyp relocations will require referencing positions at a given
> offset from the beginning of hyp sections. Since the final layout will
> not be determined until the linking of `vmlinux`, modify the hyp linker
> script to insert a symbol at the first byte of each hyp section to use
> as an anchor. The linker of `vmlinux` will place the symbols together
> with the sections.
> 
> Signed-off-by: David Brazdil <dbrazdil@google.com>
> ---
>  arch/arm64/include/asm/hyp_image.h | 29 +++++++++++++++++++++++++++--
>  arch/arm64/kvm/hyp/nvhe/hyp.lds.S  |  4 ++--
>  2 files changed, 29 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/hyp_image.h b/arch/arm64/include/asm/hyp_image.h
> index daa1a1da539e..f97b774b58f4 100644
> --- a/arch/arm64/include/asm/hyp_image.h
> +++ b/arch/arm64/include/asm/hyp_image.h
> @@ -7,6 +7,9 @@
>  #ifndef __ARM64_HYP_IMAGE_H__
>  #define __ARM64_HYP_IMAGE_H__
>  
> +#define HYP_CONCAT(a, b)	__HYP_CONCAT(a, b)
> +#define __HYP_CONCAT(a, b)	a ## b
> +

OK, this may seem like a completely pointless comment, but I have a
total mental block when I see macros written upside down

I'll fix that myself, no need to resend just for that.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 3/8] KVM: arm64: Add symbol at the beginning of each hyp section
@ 2021-01-23 13:30     ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 13:30 UTC (permalink / raw)
  To: David Brazdil
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, linux-arm-kernel,
	Will Deacon, kvmarm

On Tue, 05 Jan 2021 18:05:36 +0000,
David Brazdil <dbrazdil@google.com> wrote:
> 
> Generating hyp relocations will require referencing positions at a given
> offset from the beginning of hyp sections. Since the final layout will
> not be determined until the linking of `vmlinux`, modify the hyp linker
> script to insert a symbol at the first byte of each hyp section to use
> as an anchor. The linker of `vmlinux` will place the symbols together
> with the sections.
> 
> Signed-off-by: David Brazdil <dbrazdil@google.com>
> ---
>  arch/arm64/include/asm/hyp_image.h | 29 +++++++++++++++++++++++++++--
>  arch/arm64/kvm/hyp/nvhe/hyp.lds.S  |  4 ++--
>  2 files changed, 29 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/hyp_image.h b/arch/arm64/include/asm/hyp_image.h
> index daa1a1da539e..f97b774b58f4 100644
> --- a/arch/arm64/include/asm/hyp_image.h
> +++ b/arch/arm64/include/asm/hyp_image.h
> @@ -7,6 +7,9 @@
>  #ifndef __ARM64_HYP_IMAGE_H__
>  #define __ARM64_HYP_IMAGE_H__
>  
> +#define HYP_CONCAT(a, b)	__HYP_CONCAT(a, b)
> +#define __HYP_CONCAT(a, b)	a ## b
> +

OK, this may seem like a completely pointless comment, but I have a
total mental block when I see macros written upside down

I'll fix that myself, no need to resend just for that.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 3/8] KVM: arm64: Add symbol at the beginning of each hyp section
@ 2021-01-23 13:30     ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 13:30 UTC (permalink / raw)
  To: David Brazdil
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, linux-arm-kernel, Will Deacon,
	kvmarm, Julien Thierry

On Tue, 05 Jan 2021 18:05:36 +0000,
David Brazdil <dbrazdil@google.com> wrote:
> 
> Generating hyp relocations will require referencing positions at a given
> offset from the beginning of hyp sections. Since the final layout will
> not be determined until the linking of `vmlinux`, modify the hyp linker
> script to insert a symbol at the first byte of each hyp section to use
> as an anchor. The linker of `vmlinux` will place the symbols together
> with the sections.
> 
> Signed-off-by: David Brazdil <dbrazdil@google.com>
> ---
>  arch/arm64/include/asm/hyp_image.h | 29 +++++++++++++++++++++++++++--
>  arch/arm64/kvm/hyp/nvhe/hyp.lds.S  |  4 ++--
>  2 files changed, 29 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/hyp_image.h b/arch/arm64/include/asm/hyp_image.h
> index daa1a1da539e..f97b774b58f4 100644
> --- a/arch/arm64/include/asm/hyp_image.h
> +++ b/arch/arm64/include/asm/hyp_image.h
> @@ -7,6 +7,9 @@
>  #ifndef __ARM64_HYP_IMAGE_H__
>  #define __ARM64_HYP_IMAGE_H__
>  
> +#define HYP_CONCAT(a, b)	__HYP_CONCAT(a, b)
> +#define __HYP_CONCAT(a, b)	a ## b
> +

OK, this may seem like a completely pointless comment, but I have a
total mental block when I see macros written upside down

I'll fix that myself, no need to resend just for that.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.

_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 8/8] KVM: arm64: Remove hyp_symbol_addr
  2021-01-05 18:05   ` David Brazdil
  (?)
@ 2021-01-23 13:54     ` Marc Zyngier
  -1 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 13:54 UTC (permalink / raw)
  To: David Brazdil
  Cc: kvmarm, Catalin Marinas, Will Deacon, James Morse,
	Julien Thierry, Suzuki K Poulose, Ard Biesheuvel, Mark Rutland,
	linux-arm-kernel, linux-kernel

On Tue, 05 Jan 2021 18:05:41 +0000,
David Brazdil <dbrazdil@google.com> wrote:
> 
> Hyp code used the hyp_symbol_addr helper to force PC-relative addressing
> because absolute addressing results in kernel VAs due to the way hyp
> code is linked. This is not true anymore, so remove the helper and
> update all of its users.
> 
> Acked-by: Ard Biesheuvel <ardb@kernel.org>
> Signed-off-by: David Brazdil <dbrazdil@google.com>
> ---
>  arch/arm64/include/asm/kvm_asm.h         | 26 ------------------------
>  arch/arm64/kvm/hyp/include/hyp/switch.h  |  4 ++--
>  arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |  4 ++--
>  arch/arm64/kvm/hyp/nvhe/psci-relay.c     | 24 +++++++++++-----------
>  arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |  2 +-
>  5 files changed, 17 insertions(+), 43 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
> index 8a33d83ea843..22d933e9b59e 100644
> --- a/arch/arm64/include/asm/kvm_asm.h
> +++ b/arch/arm64/include/asm/kvm_asm.h
> @@ -199,32 +199,6 @@ extern void __vgic_v3_init_lrs(void);
>  
>  extern u32 __kvm_get_mdcr_el2(void);
>  
> -#if defined(GCC_VERSION) && GCC_VERSION < 50000
> -#define SYM_CONSTRAINT	"i"
> -#else
> -#define SYM_CONSTRAINT	"S"
> -#endif
> -
> -/*
> - * Obtain the PC-relative address of a kernel symbol
> - * s: symbol
> - *
> - * The goal of this macro is to return a symbol's address based on a
> - * PC-relative computation, as opposed to a loading the VA from a
> - * constant pool or something similar. This works well for HYP, as an
> - * absolute VA is guaranteed to be wrong. Only use this if trying to
> - * obtain the address of a symbol (i.e. not something you obtained by
> - * following a pointer).
> - */
> -#define hyp_symbol_addr(s)						\
> -	({								\
> -		typeof(s) *addr;					\
> -		asm("adrp	%0, %1\n"				\
> -		    "add	%0, %0, :lo12:%1\n"			\
> -		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
> -		addr;							\
> -	})
> -

This hunk is going to conflict in a fairly benign way with the
removal of the GCC workaround which I think Will queued for 5.12.
I'll work something out...

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 8/8] KVM: arm64: Remove hyp_symbol_addr
@ 2021-01-23 13:54     ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 13:54 UTC (permalink / raw)
  To: David Brazdil
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, linux-arm-kernel,
	Will Deacon, kvmarm

On Tue, 05 Jan 2021 18:05:41 +0000,
David Brazdil <dbrazdil@google.com> wrote:
> 
> Hyp code used the hyp_symbol_addr helper to force PC-relative addressing
> because absolute addressing results in kernel VAs due to the way hyp
> code is linked. This is not true anymore, so remove the helper and
> update all of its users.
> 
> Acked-by: Ard Biesheuvel <ardb@kernel.org>
> Signed-off-by: David Brazdil <dbrazdil@google.com>
> ---
>  arch/arm64/include/asm/kvm_asm.h         | 26 ------------------------
>  arch/arm64/kvm/hyp/include/hyp/switch.h  |  4 ++--
>  arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |  4 ++--
>  arch/arm64/kvm/hyp/nvhe/psci-relay.c     | 24 +++++++++++-----------
>  arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |  2 +-
>  5 files changed, 17 insertions(+), 43 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
> index 8a33d83ea843..22d933e9b59e 100644
> --- a/arch/arm64/include/asm/kvm_asm.h
> +++ b/arch/arm64/include/asm/kvm_asm.h
> @@ -199,32 +199,6 @@ extern void __vgic_v3_init_lrs(void);
>  
>  extern u32 __kvm_get_mdcr_el2(void);
>  
> -#if defined(GCC_VERSION) && GCC_VERSION < 50000
> -#define SYM_CONSTRAINT	"i"
> -#else
> -#define SYM_CONSTRAINT	"S"
> -#endif
> -
> -/*
> - * Obtain the PC-relative address of a kernel symbol
> - * s: symbol
> - *
> - * The goal of this macro is to return a symbol's address based on a
> - * PC-relative computation, as opposed to a loading the VA from a
> - * constant pool or something similar. This works well for HYP, as an
> - * absolute VA is guaranteed to be wrong. Only use this if trying to
> - * obtain the address of a symbol (i.e. not something you obtained by
> - * following a pointer).
> - */
> -#define hyp_symbol_addr(s)						\
> -	({								\
> -		typeof(s) *addr;					\
> -		asm("adrp	%0, %1\n"				\
> -		    "add	%0, %0, :lo12:%1\n"			\
> -		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
> -		addr;							\
> -	})
> -

This hunk is going to conflict in a fairly benign way with the
removal of the GCC workaround which I think Will queued for 5.12.
I'll work something out...

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 8/8] KVM: arm64: Remove hyp_symbol_addr
@ 2021-01-23 13:54     ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 13:54 UTC (permalink / raw)
  To: David Brazdil
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, linux-arm-kernel, Will Deacon,
	kvmarm, Julien Thierry

On Tue, 05 Jan 2021 18:05:41 +0000,
David Brazdil <dbrazdil@google.com> wrote:
> 
> Hyp code used the hyp_symbol_addr helper to force PC-relative addressing
> because absolute addressing results in kernel VAs due to the way hyp
> code is linked. This is not true anymore, so remove the helper and
> update all of its users.
> 
> Acked-by: Ard Biesheuvel <ardb@kernel.org>
> Signed-off-by: David Brazdil <dbrazdil@google.com>
> ---
>  arch/arm64/include/asm/kvm_asm.h         | 26 ------------------------
>  arch/arm64/kvm/hyp/include/hyp/switch.h  |  4 ++--
>  arch/arm64/kvm/hyp/nvhe/hyp-smp.c        |  4 ++--
>  arch/arm64/kvm/hyp/nvhe/psci-relay.c     | 24 +++++++++++-----------
>  arch/arm64/kvm/hyp/vgic-v2-cpuif-proxy.c |  2 +-
>  5 files changed, 17 insertions(+), 43 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h
> index 8a33d83ea843..22d933e9b59e 100644
> --- a/arch/arm64/include/asm/kvm_asm.h
> +++ b/arch/arm64/include/asm/kvm_asm.h
> @@ -199,32 +199,6 @@ extern void __vgic_v3_init_lrs(void);
>  
>  extern u32 __kvm_get_mdcr_el2(void);
>  
> -#if defined(GCC_VERSION) && GCC_VERSION < 50000
> -#define SYM_CONSTRAINT	"i"
> -#else
> -#define SYM_CONSTRAINT	"S"
> -#endif
> -
> -/*
> - * Obtain the PC-relative address of a kernel symbol
> - * s: symbol
> - *
> - * The goal of this macro is to return a symbol's address based on a
> - * PC-relative computation, as opposed to a loading the VA from a
> - * constant pool or something similar. This works well for HYP, as an
> - * absolute VA is guaranteed to be wrong. Only use this if trying to
> - * obtain the address of a symbol (i.e. not something you obtained by
> - * following a pointer).
> - */
> -#define hyp_symbol_addr(s)						\
> -	({								\
> -		typeof(s) *addr;					\
> -		asm("adrp	%0, %1\n"				\
> -		    "add	%0, %0, :lo12:%1\n"			\
> -		    : "=r" (addr) : SYM_CONSTRAINT (&s));		\
> -		addr;							\
> -	})
> -

This hunk is going to conflict in a fairly benign way with the
removal of the GCC workaround which I think Will queued for 5.12.
I'll work something out...

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.

_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 0/8] arm64: Relocate absolute hyp VAs
  2021-01-05 18:05 ` David Brazdil
  (?)
@ 2021-01-23 14:45   ` Marc Zyngier
  -1 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 14:45 UTC (permalink / raw)
  To: kvmarm, David Brazdil
  Cc: linux-kernel, linux-arm-kernel, Will Deacon, Ard Biesheuvel,
	Catalin Marinas

On Tue, 5 Jan 2021 18:05:33 +0000, David Brazdil wrote:
> nVHE hyp code is linked into the same kernel binary but executes under
> different memory mappings. If the compiler of hyp code chooses absolute
> addressing for accessing a symbol, the kernel linker will relocate that
> address to a kernel image virtual address, causing a runtime exception.
> 
> So far the strategy has been to force PC-relative addressing by wrapping
> all symbol references with the hyp_symbol_addr macro. This is error
> prone and developer unfriendly.
> 
> [...]

Applied to kvm-arm64/hyp-reloc, thanks!

[1/8] KVM: arm64: Rename .idmap.text in hyp linker script
      commit: eceaf38f521982bad6dbac1c02becdd80fd6af7c
[2/8] KVM: arm64: Set up .hyp.rodata ELF section
      commit: 16174eea2e4fe8247e04c17da682f2034fec0369
[3/8] KVM: arm64: Add symbol at the beginning of each hyp section
      commit: f7a4825d9569593b9a81f0768313b86175691ef1
[4/8] KVM: arm64: Generate hyp relocation data
      commit: 8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa
[5/8] KVM: arm64: Apply hyp relocations at runtime
      commit: 6ec6259d7084ed32e164c9f7b69049464dd90fa5
[6/8] KVM: arm64: Fix constant-pool users in hyp
      commit: 97cbd2fc0257c6af7036a9a6415ca8ad43535d6b
[7/8] KVM: arm64: Remove patching of fn pointers in hyp
      commit: 537db4af26e3f2e0f304f2032bc593f7e2a54938
[8/8] KVM: arm64: Remove hyp_symbol_addr
      commit: 247bc166e6b3b1e4068f120f55582a3aa210cc2d

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.



^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 0/8] arm64: Relocate absolute hyp VAs
@ 2021-01-23 14:45   ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 14:45 UTC (permalink / raw)
  To: kvmarm, David Brazdil
  Cc: Catalin Marinas, Will Deacon, linux-kernel, linux-arm-kernel,
	Ard Biesheuvel

On Tue, 5 Jan 2021 18:05:33 +0000, David Brazdil wrote:
> nVHE hyp code is linked into the same kernel binary but executes under
> different memory mappings. If the compiler of hyp code chooses absolute
> addressing for accessing a symbol, the kernel linker will relocate that
> address to a kernel image virtual address, causing a runtime exception.
> 
> So far the strategy has been to force PC-relative addressing by wrapping
> all symbol references with the hyp_symbol_addr macro. This is error
> prone and developer unfriendly.
> 
> [...]

Applied to kvm-arm64/hyp-reloc, thanks!

[1/8] KVM: arm64: Rename .idmap.text in hyp linker script
      commit: eceaf38f521982bad6dbac1c02becdd80fd6af7c
[2/8] KVM: arm64: Set up .hyp.rodata ELF section
      commit: 16174eea2e4fe8247e04c17da682f2034fec0369
[3/8] KVM: arm64: Add symbol at the beginning of each hyp section
      commit: f7a4825d9569593b9a81f0768313b86175691ef1
[4/8] KVM: arm64: Generate hyp relocation data
      commit: 8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa
[5/8] KVM: arm64: Apply hyp relocations at runtime
      commit: 6ec6259d7084ed32e164c9f7b69049464dd90fa5
[6/8] KVM: arm64: Fix constant-pool users in hyp
      commit: 97cbd2fc0257c6af7036a9a6415ca8ad43535d6b
[7/8] KVM: arm64: Remove patching of fn pointers in hyp
      commit: 537db4af26e3f2e0f304f2032bc593f7e2a54938
[8/8] KVM: arm64: Remove hyp_symbol_addr
      commit: 247bc166e6b3b1e4068f120f55582a3aa210cc2d

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.


_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 0/8] arm64: Relocate absolute hyp VAs
@ 2021-01-23 14:45   ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-23 14:45 UTC (permalink / raw)
  To: kvmarm, David Brazdil
  Cc: Catalin Marinas, Will Deacon, linux-kernel, linux-arm-kernel,
	Ard Biesheuvel

On Tue, 5 Jan 2021 18:05:33 +0000, David Brazdil wrote:
> nVHE hyp code is linked into the same kernel binary but executes under
> different memory mappings. If the compiler of hyp code chooses absolute
> addressing for accessing a symbol, the kernel linker will relocate that
> address to a kernel image virtual address, causing a runtime exception.
> 
> So far the strategy has been to force PC-relative addressing by wrapping
> all symbol references with the hyp_symbol_addr macro. This is error
> prone and developer unfriendly.
> 
> [...]

Applied to kvm-arm64/hyp-reloc, thanks!

[1/8] KVM: arm64: Rename .idmap.text in hyp linker script
      commit: eceaf38f521982bad6dbac1c02becdd80fd6af7c
[2/8] KVM: arm64: Set up .hyp.rodata ELF section
      commit: 16174eea2e4fe8247e04c17da682f2034fec0369
[3/8] KVM: arm64: Add symbol at the beginning of each hyp section
      commit: f7a4825d9569593b9a81f0768313b86175691ef1
[4/8] KVM: arm64: Generate hyp relocation data
      commit: 8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa
[5/8] KVM: arm64: Apply hyp relocations at runtime
      commit: 6ec6259d7084ed32e164c9f7b69049464dd90fa5
[6/8] KVM: arm64: Fix constant-pool users in hyp
      commit: 97cbd2fc0257c6af7036a9a6415ca8ad43535d6b
[7/8] KVM: arm64: Remove patching of fn pointers in hyp
      commit: 537db4af26e3f2e0f304f2032bc593f7e2a54938
[8/8] KVM: arm64: Remove hyp_symbol_addr
      commit: 247bc166e6b3b1e4068f120f55582a3aa210cc2d

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.



_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
  2021-01-05 18:05   ` David Brazdil
  (?)
@ 2021-01-29 21:43     ` Guenter Roeck
  -1 siblings, 0 replies; 57+ messages in thread
From: Guenter Roeck @ 2021-01-29 21:43 UTC (permalink / raw)
  To: David Brazdil
  Cc: kvmarm, Mark Rutland, Suzuki K Poulose, Catalin Marinas,
	linux-kernel, James Morse, linux-arm-kernel, Marc Zyngier,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Hi,

On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> Add a post-processing step to compilation of KVM nVHE hyp code which
> calls a custom host tool (gen-hyprel) on the partially linked object
> file (hyp sections' names prefixed).
> 
> The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> sections and generates an assembly file that will form a new section
> .hyp.reloc in the kernel binary. The new section contains an array of
> 32-bit offsets to the positions targeted by these relocations.
> 
> Since these addresses of those positions will not be determined until
> linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> relocation with addend <section_base_sym> + <r_offset>. The linker of
> `vmlinux` will therefore fill the slot accordingly.
> 
> This relocation data will be used at runtime to convert the kernel VAs
> at those positions to hyp VAs.
> 
> Signed-off-by: David Brazdil <dbrazdil@google.com>

This patch results in the following error for me.

error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)

The problem is seen when trying to build aarch64 images in big endian
mode.

Te script used to reproduce the problem as well as bisect results are
attached.

Guenter

---
Script used to reproduce the problem:

make-arm64 allmodconfig
echo "CONFIG_CPU_BIG_ENDIAN=y" >> .config
make-arm64 olddefconfig

rm -f arch/arm64/kvm/hyp/nvhe/kvm_nvhe.o
make-arm64 -j arch/arm64/kvm/hyp/nvhe/kvm_nvhe.o

where make-arm64 is:

make -j32 ARCH=arm64 CROSS_COMPILE=aarch64-linux- $*

---
# bad: [b01f250d83f6c3af5c77699dd14e7b48ee0b5383] Add linux-next specific files for 20210129
# good: [6ee1d745b7c9fd573fba142a2efdad76a9f1cb04] Linux 5.11-rc5
git bisect start 'HEAD' 'v5.11-rc5'
# good: [7b7f6e418b7121fd3f05029f843ff1eb76e4cc4d] Merge remote-tracking branch 'crypto/master'
git bisect good 7b7f6e418b7121fd3f05029f843ff1eb76e4cc4d
# good: [4a8b64f4e85b5f2d8e68641ce26af8cf9d9a66af] Merge remote-tracking branch 'keys/keys-next'
git bisect good 4a8b64f4e85b5f2d8e68641ce26af8cf9d9a66af
# bad: [79a914d7f707c1aa5ede7ce38588b32093b2abbe] Merge remote-tracking branch 'thunderbolt/next'
git bisect bad 79a914d7f707c1aa5ede7ce38588b32093b2abbe
# good: [f22712067d6f3d1884186509a942da26d2d52166] Merge remote-tracking branch 'rcu/rcu/next'
git bisect good f22712067d6f3d1884186509a942da26d2d52166
# bad: [4a42e6b0a53bcc4b58a35b8d5df50581e94b1daa] Merge remote-tracking branch 'usb/usb-next'
git bisect bad 4a42e6b0a53bcc4b58a35b8d5df50581e94b1daa
# good: [1a9e38cabd80356ffb98c2c88fec528ea9644fd5] usb: dwc2: Make "trimming xfer length" a debug message
git bisect good 1a9e38cabd80356ffb98c2c88fec528ea9644fd5
# bad: [589e25c6dfdd535e8eba052f7314054f6d75be4a] Merge remote-tracking branch 'drivers-x86/for-next'
git bisect bad 589e25c6dfdd535e8eba052f7314054f6d75be4a
# bad: [08c11d16ca91e770de81e5959e22eb34541f8af9] Merge remote-tracking branch 'percpu/for-next'
git bisect bad 08c11d16ca91e770de81e5959e22eb34541f8af9
# bad: [cc6d8fa3667aa5513dc2bbca896a4c287aa956f3] Merge branch 'kvm-arm64/misc-5.12' into kvmarm-master/next
git bisect bad cc6d8fa3667aa5513dc2bbca896a4c287aa956f3
# bad: [247bc166e6b3b1e4068f120f55582a3aa210cc2d] KVM: arm64: Remove hyp_symbol_addr
git bisect bad 247bc166e6b3b1e4068f120f55582a3aa210cc2d
# bad: [8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa] KVM: arm64: Generate hyp relocation data
git bisect bad 8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa
# good: [16174eea2e4fe8247e04c17da682f2034fec0369] KVM: arm64: Set up .hyp.rodata ELF section
git bisect good 16174eea2e4fe8247e04c17da682f2034fec0369
# good: [f7a4825d9569593b9a81f0768313b86175691ef1] KVM: arm64: Add symbol at the beginning of each hyp section
git bisect good f7a4825d9569593b9a81f0768313b86175691ef1
# first bad commit: [8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa] KVM: arm64: Generate hyp relocation data

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-29 21:43     ` Guenter Roeck
  0 siblings, 0 replies; 57+ messages in thread
From: Guenter Roeck @ 2021-01-29 21:43 UTC (permalink / raw)
  To: David Brazdil
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, Marc Zyngier,
	Will Deacon, kvmarm, linux-arm-kernel

Hi,

On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> Add a post-processing step to compilation of KVM nVHE hyp code which
> calls a custom host tool (gen-hyprel) on the partially linked object
> file (hyp sections' names prefixed).
> 
> The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> sections and generates an assembly file that will form a new section
> .hyp.reloc in the kernel binary. The new section contains an array of
> 32-bit offsets to the positions targeted by these relocations.
> 
> Since these addresses of those positions will not be determined until
> linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> relocation with addend <section_base_sym> + <r_offset>. The linker of
> `vmlinux` will therefore fill the slot accordingly.
> 
> This relocation data will be used at runtime to convert the kernel VAs
> at those positions to hyp VAs.
> 
> Signed-off-by: David Brazdil <dbrazdil@google.com>

This patch results in the following error for me.

error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)

The problem is seen when trying to build aarch64 images in big endian
mode.

Te script used to reproduce the problem as well as bisect results are
attached.

Guenter

---
Script used to reproduce the problem:

make-arm64 allmodconfig
echo "CONFIG_CPU_BIG_ENDIAN=y" >> .config
make-arm64 olddefconfig

rm -f arch/arm64/kvm/hyp/nvhe/kvm_nvhe.o
make-arm64 -j arch/arm64/kvm/hyp/nvhe/kvm_nvhe.o

where make-arm64 is:

make -j32 ARCH=arm64 CROSS_COMPILE=aarch64-linux- $*

---
# bad: [b01f250d83f6c3af5c77699dd14e7b48ee0b5383] Add linux-next specific files for 20210129
# good: [6ee1d745b7c9fd573fba142a2efdad76a9f1cb04] Linux 5.11-rc5
git bisect start 'HEAD' 'v5.11-rc5'
# good: [7b7f6e418b7121fd3f05029f843ff1eb76e4cc4d] Merge remote-tracking branch 'crypto/master'
git bisect good 7b7f6e418b7121fd3f05029f843ff1eb76e4cc4d
# good: [4a8b64f4e85b5f2d8e68641ce26af8cf9d9a66af] Merge remote-tracking branch 'keys/keys-next'
git bisect good 4a8b64f4e85b5f2d8e68641ce26af8cf9d9a66af
# bad: [79a914d7f707c1aa5ede7ce38588b32093b2abbe] Merge remote-tracking branch 'thunderbolt/next'
git bisect bad 79a914d7f707c1aa5ede7ce38588b32093b2abbe
# good: [f22712067d6f3d1884186509a942da26d2d52166] Merge remote-tracking branch 'rcu/rcu/next'
git bisect good f22712067d6f3d1884186509a942da26d2d52166
# bad: [4a42e6b0a53bcc4b58a35b8d5df50581e94b1daa] Merge remote-tracking branch 'usb/usb-next'
git bisect bad 4a42e6b0a53bcc4b58a35b8d5df50581e94b1daa
# good: [1a9e38cabd80356ffb98c2c88fec528ea9644fd5] usb: dwc2: Make "trimming xfer length" a debug message
git bisect good 1a9e38cabd80356ffb98c2c88fec528ea9644fd5
# bad: [589e25c6dfdd535e8eba052f7314054f6d75be4a] Merge remote-tracking branch 'drivers-x86/for-next'
git bisect bad 589e25c6dfdd535e8eba052f7314054f6d75be4a
# bad: [08c11d16ca91e770de81e5959e22eb34541f8af9] Merge remote-tracking branch 'percpu/for-next'
git bisect bad 08c11d16ca91e770de81e5959e22eb34541f8af9
# bad: [cc6d8fa3667aa5513dc2bbca896a4c287aa956f3] Merge branch 'kvm-arm64/misc-5.12' into kvmarm-master/next
git bisect bad cc6d8fa3667aa5513dc2bbca896a4c287aa956f3
# bad: [247bc166e6b3b1e4068f120f55582a3aa210cc2d] KVM: arm64: Remove hyp_symbol_addr
git bisect bad 247bc166e6b3b1e4068f120f55582a3aa210cc2d
# bad: [8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa] KVM: arm64: Generate hyp relocation data
git bisect bad 8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa
# good: [16174eea2e4fe8247e04c17da682f2034fec0369] KVM: arm64: Set up .hyp.rodata ELF section
git bisect good 16174eea2e4fe8247e04c17da682f2034fec0369
# good: [f7a4825d9569593b9a81f0768313b86175691ef1] KVM: arm64: Add symbol at the beginning of each hyp section
git bisect good f7a4825d9569593b9a81f0768313b86175691ef1
# first bad commit: [8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa] KVM: arm64: Generate hyp relocation data
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-29 21:43     ` Guenter Roeck
  0 siblings, 0 replies; 57+ messages in thread
From: Guenter Roeck @ 2021-01-29 21:43 UTC (permalink / raw)
  To: David Brazdil
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, Julien Thierry, Marc Zyngier,
	Will Deacon, kvmarm, linux-arm-kernel

Hi,

On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> Add a post-processing step to compilation of KVM nVHE hyp code which
> calls a custom host tool (gen-hyprel) on the partially linked object
> file (hyp sections' names prefixed).
> 
> The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> sections and generates an assembly file that will form a new section
> .hyp.reloc in the kernel binary. The new section contains an array of
> 32-bit offsets to the positions targeted by these relocations.
> 
> Since these addresses of those positions will not be determined until
> linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> relocation with addend <section_base_sym> + <r_offset>. The linker of
> `vmlinux` will therefore fill the slot accordingly.
> 
> This relocation data will be used at runtime to convert the kernel VAs
> at those positions to hyp VAs.
> 
> Signed-off-by: David Brazdil <dbrazdil@google.com>

This patch results in the following error for me.

error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)

The problem is seen when trying to build aarch64 images in big endian
mode.

Te script used to reproduce the problem as well as bisect results are
attached.

Guenter

---
Script used to reproduce the problem:

make-arm64 allmodconfig
echo "CONFIG_CPU_BIG_ENDIAN=y" >> .config
make-arm64 olddefconfig

rm -f arch/arm64/kvm/hyp/nvhe/kvm_nvhe.o
make-arm64 -j arch/arm64/kvm/hyp/nvhe/kvm_nvhe.o

where make-arm64 is:

make -j32 ARCH=arm64 CROSS_COMPILE=aarch64-linux- $*

---
# bad: [b01f250d83f6c3af5c77699dd14e7b48ee0b5383] Add linux-next specific files for 20210129
# good: [6ee1d745b7c9fd573fba142a2efdad76a9f1cb04] Linux 5.11-rc5
git bisect start 'HEAD' 'v5.11-rc5'
# good: [7b7f6e418b7121fd3f05029f843ff1eb76e4cc4d] Merge remote-tracking branch 'crypto/master'
git bisect good 7b7f6e418b7121fd3f05029f843ff1eb76e4cc4d
# good: [4a8b64f4e85b5f2d8e68641ce26af8cf9d9a66af] Merge remote-tracking branch 'keys/keys-next'
git bisect good 4a8b64f4e85b5f2d8e68641ce26af8cf9d9a66af
# bad: [79a914d7f707c1aa5ede7ce38588b32093b2abbe] Merge remote-tracking branch 'thunderbolt/next'
git bisect bad 79a914d7f707c1aa5ede7ce38588b32093b2abbe
# good: [f22712067d6f3d1884186509a942da26d2d52166] Merge remote-tracking branch 'rcu/rcu/next'
git bisect good f22712067d6f3d1884186509a942da26d2d52166
# bad: [4a42e6b0a53bcc4b58a35b8d5df50581e94b1daa] Merge remote-tracking branch 'usb/usb-next'
git bisect bad 4a42e6b0a53bcc4b58a35b8d5df50581e94b1daa
# good: [1a9e38cabd80356ffb98c2c88fec528ea9644fd5] usb: dwc2: Make "trimming xfer length" a debug message
git bisect good 1a9e38cabd80356ffb98c2c88fec528ea9644fd5
# bad: [589e25c6dfdd535e8eba052f7314054f6d75be4a] Merge remote-tracking branch 'drivers-x86/for-next'
git bisect bad 589e25c6dfdd535e8eba052f7314054f6d75be4a
# bad: [08c11d16ca91e770de81e5959e22eb34541f8af9] Merge remote-tracking branch 'percpu/for-next'
git bisect bad 08c11d16ca91e770de81e5959e22eb34541f8af9
# bad: [cc6d8fa3667aa5513dc2bbca896a4c287aa956f3] Merge branch 'kvm-arm64/misc-5.12' into kvmarm-master/next
git bisect bad cc6d8fa3667aa5513dc2bbca896a4c287aa956f3
# bad: [247bc166e6b3b1e4068f120f55582a3aa210cc2d] KVM: arm64: Remove hyp_symbol_addr
git bisect bad 247bc166e6b3b1e4068f120f55582a3aa210cc2d
# bad: [8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa] KVM: arm64: Generate hyp relocation data
git bisect bad 8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa
# good: [16174eea2e4fe8247e04c17da682f2034fec0369] KVM: arm64: Set up .hyp.rodata ELF section
git bisect good 16174eea2e4fe8247e04c17da682f2034fec0369
# good: [f7a4825d9569593b9a81f0768313b86175691ef1] KVM: arm64: Add symbol at the beginning of each hyp section
git bisect good f7a4825d9569593b9a81f0768313b86175691ef1
# first bad commit: [8c49b5d43d4c45ca0bb0d1faa23feef2e76e89fa] KVM: arm64: Generate hyp relocation data

_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
  2021-01-29 21:43     ` Guenter Roeck
  (?)
@ 2021-01-30 12:16       ` Marc Zyngier
  -1 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 12:16 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: David Brazdil, kvmarm, Mark Rutland, Suzuki K Poulose,
	Catalin Marinas, linux-kernel, James Morse, linux-arm-kernel,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Hi Guenter,

Thanks a lot for the heads up.

On 2021-01-29 21:43, Guenter Roeck wrote:
> Hi,
> 
> On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
>> Add a post-processing step to compilation of KVM nVHE hyp code which
>> calls a custom host tool (gen-hyprel) on the partially linked object
>> file (hyp sections' names prefixed).
>> 
>> The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
>> sections and generates an assembly file that will form a new section
>> .hyp.reloc in the kernel binary. The new section contains an array of
>> 32-bit offsets to the positions targeted by these relocations.
>> 
>> Since these addresses of those positions will not be determined until
>> linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
>> relocation with addend <section_base_sym> + <r_offset>. The linker of
>> `vmlinux` will therefore fill the slot accordingly.
>> 
>> This relocation data will be used at runtime to convert the kernel VAs
>> at those positions to hyp VAs.
>> 
>> Signed-off-by: David Brazdil <dbrazdil@google.com>
> 
> This patch results in the following error for me.
> 
> error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion
> elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> 
> The problem is seen when trying to build aarch64 images in big endian
> mode.

Ah, big-endian. of course, the ELF header is in native endianness,
and the sanity checks explode (still much better than generating crap).

I'll have a look shortly. It shouldn't too hard to fix, just a
bit invasive...

Thanks again,

         M.
-- 
Jazz is not dead. It just smells funny...

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-30 12:16       ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 12:16 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, Will Deacon,
	kvmarm, linux-arm-kernel

Hi Guenter,

Thanks a lot for the heads up.

On 2021-01-29 21:43, Guenter Roeck wrote:
> Hi,
> 
> On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
>> Add a post-processing step to compilation of KVM nVHE hyp code which
>> calls a custom host tool (gen-hyprel) on the partially linked object
>> file (hyp sections' names prefixed).
>> 
>> The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
>> sections and generates an assembly file that will form a new section
>> .hyp.reloc in the kernel binary. The new section contains an array of
>> 32-bit offsets to the positions targeted by these relocations.
>> 
>> Since these addresses of those positions will not be determined until
>> linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
>> relocation with addend <section_base_sym> + <r_offset>. The linker of
>> `vmlinux` will therefore fill the slot accordingly.
>> 
>> This relocation data will be used at runtime to convert the kernel VAs
>> at those positions to hyp VAs.
>> 
>> Signed-off-by: David Brazdil <dbrazdil@google.com>
> 
> This patch results in the following error for me.
> 
> error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion
> elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> 
> The problem is seen when trying to build aarch64 images in big endian
> mode.

Ah, big-endian. of course, the ELF header is in native endianness,
and the sanity checks explode (still much better than generating crap).

I'll have a look shortly. It shouldn't too hard to fix, just a
bit invasive...

Thanks again,

         M.
-- 
Jazz is not dead. It just smells funny...
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-30 12:16       ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 12:16 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, Julien Thierry, David Brazdil,
	Will Deacon, kvmarm, linux-arm-kernel

Hi Guenter,

Thanks a lot for the heads up.

On 2021-01-29 21:43, Guenter Roeck wrote:
> Hi,
> 
> On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
>> Add a post-processing step to compilation of KVM nVHE hyp code which
>> calls a custom host tool (gen-hyprel) on the partially linked object
>> file (hyp sections' names prefixed).
>> 
>> The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
>> sections and generates an assembly file that will form a new section
>> .hyp.reloc in the kernel binary. The new section contains an array of
>> 32-bit offsets to the positions targeted by these relocations.
>> 
>> Since these addresses of those positions will not be determined until
>> linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
>> relocation with addend <section_base_sym> + <r_offset>. The linker of
>> `vmlinux` will therefore fill the slot accordingly.
>> 
>> This relocation data will be used at runtime to convert the kernel VAs
>> at those positions to hyp VAs.
>> 
>> Signed-off-by: David Brazdil <dbrazdil@google.com>
> 
> This patch results in the following error for me.
> 
> error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion
> elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> 
> The problem is seen when trying to build aarch64 images in big endian
> mode.

Ah, big-endian. of course, the ELF header is in native endianness,
and the sanity checks explode (still much better than generating crap).

I'll have a look shortly. It shouldn't too hard to fix, just a
bit invasive...

Thanks again,

         M.
-- 
Jazz is not dead. It just smells funny...

_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
  2021-01-29 21:43     ` Guenter Roeck
  (?)
@ 2021-01-30 13:44       ` Marc Zyngier
  -1 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 13:44 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: David Brazdil, kvmarm, Mark Rutland, Suzuki K Poulose,
	Catalin Marinas, linux-kernel, James Morse, linux-arm-kernel,
	Will Deacon, Ard Biesheuvel, Julien Thierry

On Fri, 29 Jan 2021 21:43:25 +0000,
Guenter Roeck <linux@roeck-us.net> wrote:
> 
> Hi,
> 
> On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> > Add a post-processing step to compilation of KVM nVHE hyp code which
> > calls a custom host tool (gen-hyprel) on the partially linked object
> > file (hyp sections' names prefixed).
> > 
> > The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> > sections and generates an assembly file that will form a new section
> > .hyp.reloc in the kernel binary. The new section contains an array of
> > 32-bit offsets to the positions targeted by these relocations.
> > 
> > Since these addresses of those positions will not be determined until
> > linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> > relocation with addend <section_base_sym> + <r_offset>. The linker of
> > `vmlinux` will therefore fill the slot accordingly.
> > 
> > This relocation data will be used at runtime to convert the kernel VAs
> > at those positions to hyp VAs.
> > 
> > Signed-off-by: David Brazdil <dbrazdil@google.com>
> 
> This patch results in the following error for me.
> 
> error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> 
> The problem is seen when trying to build aarch64 images in big endian
> mode.
> 
> Te script used to reproduce the problem as well as bisect results are
> attached.

I came up with the following patch, which allows the kernel to link
and boot. I don't have any BE userspace, so I didn't verify that I
could boot a guest (the hypervisor does correctly initialise though).

It's not exactly pretty, but it does the job...

Thanks,

	M.

From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@kernel.org>
Date: Sat, 30 Jan 2021 13:07:51 +0000
Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic

gen-hyprel is, for better or worse, a native-endian program:
it assumes that the ELF data structures are in the host's
endianness, and even assumes that the compiled kernel is
little-endian in one particular case.

None of these assumptions hold true though: people actually build
(use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
Madness!

In order to solve this, wrap each access to the ELF data structures
with the required byte-swapping magic. This requires to obtain
the kernel data structure, and provide per-endianess wrappers.

This result in a kernel that links and even boots in a model.

Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
 2 files changed, 42 insertions(+), 16 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 268be1376f74..09d04dd50eb8 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__
 
 hostprogs := gen-hyprel
+HOST_EXTRACFLAGS += -I$(srctree)/include
 
 obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
 	 hyp-main.o hyp-smp.o psci-relay.o
diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
index 58fe31fdba8e..ead02c6a7628 100644
--- a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
+++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
@@ -25,6 +25,7 @@
  */
 
 #include <elf.h>
+#include <endian.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdbool.h>
@@ -36,6 +37,8 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include <generated/autoconf.h>
+
 #define HYP_SECTION_PREFIX		".hyp"
 #define HYP_RELOC_SECTION		".hyp.reloc"
 #define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
@@ -121,6 +124,28 @@ static struct {
 	const char	*sh_string;
 } elf;
 
+#if defined(CONFIG_CPU_LITTLE_ENDIAN)
+
+#define elf16toh(x)	le16toh(x)
+#define elf32toh(x)	le32toh(x)
+#define elf64toh(x)	le64toh(x)
+
+#define ELFENDIAN	ELFDATA2LSB
+
+#elif defined(CONFIG_CPU_BIG_ENDIAN)
+
+#define elf16toh(x)	be16toh(x)
+#define elf32toh(x)	be32toh(x)
+#define elf64toh(x)	be64toh(x)
+
+#define ELFENDIAN	ELFDATA2MSB
+
+#else
+
+#error PDP-endian sadly unsupported...
+
+#endif
+
 #define fatal_error(fmt, ...)						\
 	({								\
 		fprintf(stderr, "error: %s: " fmt "\n",			\
@@ -162,12 +187,12 @@ static struct {
 
 /* Iterate over all sections in the ELF. */
 #define for_each_section(var) \
-	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
+	for (var = elf.sh_table; var < elf.sh_table + elf16toh(elf.ehdr->e_shnum); ++var)
 
 /* Iterate over all Elf64_Rela relocations in a given section. */
 #define for_each_rela(shdr, var)					\
-	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
-	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
+	for (var = elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset));	\
+	     var < elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset) + elf64toh(shdr->sh_size)); var++)
 
 /* True if a string starts with a given prefix. */
 static inline bool starts_with(const char *str, const char *prefix)
@@ -178,13 +203,13 @@ static inline bool starts_with(const char *str, const char *prefix)
 /* Returns a string containing the name of a given section. */
 static inline const char *section_name(Elf64_Shdr *shdr)
 {
-	return elf.sh_string + shdr->sh_name;
+	return elf.sh_string + elf32toh(shdr->sh_name);
 }
 
 /* Returns a pointer to the first byte of section data. */
 static inline const char *section_begin(Elf64_Shdr *shdr)
 {
-	return elf_ptr(char, shdr->sh_offset);
+	return elf_ptr(char, elf64toh(shdr->sh_offset));
 }
 
 /* Find a section by its offset from the beginning of the file. */
@@ -247,13 +272,13 @@ static void init_elf(const char *path)
 
 	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
 	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
-	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
-	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
-	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
+	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFENDIAN, "%u");
+	assert_eq(elf16toh(elf.ehdr->e_type), ET_REL, "%u");
+	assert_eq(elf16toh(elf.ehdr->e_machine), EM_AARCH64, "%u");
 
 	/* Populate fields of the global struct. */
-	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
-	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
+	elf.sh_table = section_by_off(elf64toh(elf.ehdr->e_shoff));
+	elf.sh_string = section_begin(section_by_idx(elf16toh(elf.ehdr->e_shstrndx)));
 }
 
 /* Print the prologue of the output ASM file. */
@@ -301,8 +326,8 @@ static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
 	 * is `rela->r_offset`.
 	 */
 	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
-		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
-		rela->r_offset);
+	       reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
+	       elf64toh(rela->r_offset));
 
 	reloc_offset += 4;
 }
@@ -322,7 +347,7 @@ static void emit_epilogue(void)
  */
 static void emit_rela_section(Elf64_Shdr *sh_rela)
 {
-	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
+	Elf64_Shdr *sh_orig = &elf.sh_table[elf32toh(sh_rela->sh_info)];
 	const char *sh_orig_name = section_name(sh_orig);
 	Elf64_Rela *rela;
 
@@ -333,10 +358,10 @@ static void emit_rela_section(Elf64_Shdr *sh_rela)
 	emit_section_prologue(sh_orig_name);
 
 	for_each_rela(sh_rela, rela) {
-		uint32_t type = (uint32_t)rela->r_info;
+		uint32_t type = (uint32_t)elf64toh(rela->r_info);
 
 		/* Check that rela points inside the relocated section. */
-		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
+		assert_lt(elf64toh(rela->r_offset), elf64toh(sh_orig->sh_size), "0x%lx");
 
 		switch (type) {
 		/*
@@ -385,7 +410,7 @@ static void emit_all_relocs(void)
 	Elf64_Shdr *shdr;
 
 	for_each_section(shdr) {
-		switch (shdr->sh_type) {
+		switch (elf32toh(shdr->sh_type)) {
 		case SHT_REL:
 			fatal_error("Unexpected SHT_REL section \"%s\"",
 				section_name(shdr));
-- 
2.29.2


-- 
Without deviation from the norm, progress is not possible.

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-30 13:44       ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 13:44 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, Will Deacon,
	kvmarm, linux-arm-kernel

On Fri, 29 Jan 2021 21:43:25 +0000,
Guenter Roeck <linux@roeck-us.net> wrote:
> 
> Hi,
> 
> On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> > Add a post-processing step to compilation of KVM nVHE hyp code which
> > calls a custom host tool (gen-hyprel) on the partially linked object
> > file (hyp sections' names prefixed).
> > 
> > The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> > sections and generates an assembly file that will form a new section
> > .hyp.reloc in the kernel binary. The new section contains an array of
> > 32-bit offsets to the positions targeted by these relocations.
> > 
> > Since these addresses of those positions will not be determined until
> > linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> > relocation with addend <section_base_sym> + <r_offset>. The linker of
> > `vmlinux` will therefore fill the slot accordingly.
> > 
> > This relocation data will be used at runtime to convert the kernel VAs
> > at those positions to hyp VAs.
> > 
> > Signed-off-by: David Brazdil <dbrazdil@google.com>
> 
> This patch results in the following error for me.
> 
> error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> 
> The problem is seen when trying to build aarch64 images in big endian
> mode.
> 
> Te script used to reproduce the problem as well as bisect results are
> attached.

I came up with the following patch, which allows the kernel to link
and boot. I don't have any BE userspace, so I didn't verify that I
could boot a guest (the hypervisor does correctly initialise though).

It's not exactly pretty, but it does the job...

Thanks,

	M.

From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@kernel.org>
Date: Sat, 30 Jan 2021 13:07:51 +0000
Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic

gen-hyprel is, for better or worse, a native-endian program:
it assumes that the ELF data structures are in the host's
endianness, and even assumes that the compiled kernel is
little-endian in one particular case.

None of these assumptions hold true though: people actually build
(use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
Madness!

In order to solve this, wrap each access to the ELF data structures
with the required byte-swapping magic. This requires to obtain
the kernel data structure, and provide per-endianess wrappers.

This result in a kernel that links and even boots in a model.

Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
 2 files changed, 42 insertions(+), 16 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 268be1376f74..09d04dd50eb8 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__
 
 hostprogs := gen-hyprel
+HOST_EXTRACFLAGS += -I$(srctree)/include
 
 obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
 	 hyp-main.o hyp-smp.o psci-relay.o
diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
index 58fe31fdba8e..ead02c6a7628 100644
--- a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
+++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
@@ -25,6 +25,7 @@
  */
 
 #include <elf.h>
+#include <endian.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdbool.h>
@@ -36,6 +37,8 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include <generated/autoconf.h>
+
 #define HYP_SECTION_PREFIX		".hyp"
 #define HYP_RELOC_SECTION		".hyp.reloc"
 #define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
@@ -121,6 +124,28 @@ static struct {
 	const char	*sh_string;
 } elf;
 
+#if defined(CONFIG_CPU_LITTLE_ENDIAN)
+
+#define elf16toh(x)	le16toh(x)
+#define elf32toh(x)	le32toh(x)
+#define elf64toh(x)	le64toh(x)
+
+#define ELFENDIAN	ELFDATA2LSB
+
+#elif defined(CONFIG_CPU_BIG_ENDIAN)
+
+#define elf16toh(x)	be16toh(x)
+#define elf32toh(x)	be32toh(x)
+#define elf64toh(x)	be64toh(x)
+
+#define ELFENDIAN	ELFDATA2MSB
+
+#else
+
+#error PDP-endian sadly unsupported...
+
+#endif
+
 #define fatal_error(fmt, ...)						\
 	({								\
 		fprintf(stderr, "error: %s: " fmt "\n",			\
@@ -162,12 +187,12 @@ static struct {
 
 /* Iterate over all sections in the ELF. */
 #define for_each_section(var) \
-	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
+	for (var = elf.sh_table; var < elf.sh_table + elf16toh(elf.ehdr->e_shnum); ++var)
 
 /* Iterate over all Elf64_Rela relocations in a given section. */
 #define for_each_rela(shdr, var)					\
-	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
-	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
+	for (var = elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset));	\
+	     var < elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset) + elf64toh(shdr->sh_size)); var++)
 
 /* True if a string starts with a given prefix. */
 static inline bool starts_with(const char *str, const char *prefix)
@@ -178,13 +203,13 @@ static inline bool starts_with(const char *str, const char *prefix)
 /* Returns a string containing the name of a given section. */
 static inline const char *section_name(Elf64_Shdr *shdr)
 {
-	return elf.sh_string + shdr->sh_name;
+	return elf.sh_string + elf32toh(shdr->sh_name);
 }
 
 /* Returns a pointer to the first byte of section data. */
 static inline const char *section_begin(Elf64_Shdr *shdr)
 {
-	return elf_ptr(char, shdr->sh_offset);
+	return elf_ptr(char, elf64toh(shdr->sh_offset));
 }
 
 /* Find a section by its offset from the beginning of the file. */
@@ -247,13 +272,13 @@ static void init_elf(const char *path)
 
 	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
 	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
-	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
-	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
-	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
+	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFENDIAN, "%u");
+	assert_eq(elf16toh(elf.ehdr->e_type), ET_REL, "%u");
+	assert_eq(elf16toh(elf.ehdr->e_machine), EM_AARCH64, "%u");
 
 	/* Populate fields of the global struct. */
-	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
-	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
+	elf.sh_table = section_by_off(elf64toh(elf.ehdr->e_shoff));
+	elf.sh_string = section_begin(section_by_idx(elf16toh(elf.ehdr->e_shstrndx)));
 }
 
 /* Print the prologue of the output ASM file. */
@@ -301,8 +326,8 @@ static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
 	 * is `rela->r_offset`.
 	 */
 	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
-		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
-		rela->r_offset);
+	       reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
+	       elf64toh(rela->r_offset));
 
 	reloc_offset += 4;
 }
@@ -322,7 +347,7 @@ static void emit_epilogue(void)
  */
 static void emit_rela_section(Elf64_Shdr *sh_rela)
 {
-	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
+	Elf64_Shdr *sh_orig = &elf.sh_table[elf32toh(sh_rela->sh_info)];
 	const char *sh_orig_name = section_name(sh_orig);
 	Elf64_Rela *rela;
 
@@ -333,10 +358,10 @@ static void emit_rela_section(Elf64_Shdr *sh_rela)
 	emit_section_prologue(sh_orig_name);
 
 	for_each_rela(sh_rela, rela) {
-		uint32_t type = (uint32_t)rela->r_info;
+		uint32_t type = (uint32_t)elf64toh(rela->r_info);
 
 		/* Check that rela points inside the relocated section. */
-		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
+		assert_lt(elf64toh(rela->r_offset), elf64toh(sh_orig->sh_size), "0x%lx");
 
 		switch (type) {
 		/*
@@ -385,7 +410,7 @@ static void emit_all_relocs(void)
 	Elf64_Shdr *shdr;
 
 	for_each_section(shdr) {
-		switch (shdr->sh_type) {
+		switch (elf32toh(shdr->sh_type)) {
 		case SHT_REL:
 			fatal_error("Unexpected SHT_REL section \"%s\"",
 				section_name(shdr));
-- 
2.29.2


-- 
Without deviation from the norm, progress is not possible.
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply related	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-30 13:44       ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 13:44 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, Julien Thierry, David Brazdil,
	Will Deacon, kvmarm, linux-arm-kernel

On Fri, 29 Jan 2021 21:43:25 +0000,
Guenter Roeck <linux@roeck-us.net> wrote:
> 
> Hi,
> 
> On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> > Add a post-processing step to compilation of KVM nVHE hyp code which
> > calls a custom host tool (gen-hyprel) on the partially linked object
> > file (hyp sections' names prefixed).
> > 
> > The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> > sections and generates an assembly file that will form a new section
> > .hyp.reloc in the kernel binary. The new section contains an array of
> > 32-bit offsets to the positions targeted by these relocations.
> > 
> > Since these addresses of those positions will not be determined until
> > linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> > relocation with addend <section_base_sym> + <r_offset>. The linker of
> > `vmlinux` will therefore fill the slot accordingly.
> > 
> > This relocation data will be used at runtime to convert the kernel VAs
> > at those positions to hyp VAs.
> > 
> > Signed-off-by: David Brazdil <dbrazdil@google.com>
> 
> This patch results in the following error for me.
> 
> error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> 
> The problem is seen when trying to build aarch64 images in big endian
> mode.
> 
> Te script used to reproduce the problem as well as bisect results are
> attached.

I came up with the following patch, which allows the kernel to link
and boot. I don't have any BE userspace, so I didn't verify that I
could boot a guest (the hypervisor does correctly initialise though).

It's not exactly pretty, but it does the job...

Thanks,

	M.

From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <maz@kernel.org>
Date: Sat, 30 Jan 2021 13:07:51 +0000
Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic

gen-hyprel is, for better or worse, a native-endian program:
it assumes that the ELF data structures are in the host's
endianness, and even assumes that the compiled kernel is
little-endian in one particular case.

None of these assumptions hold true though: people actually build
(use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
Madness!

In order to solve this, wrap each access to the ELF data structures
with the required byte-swapping magic. This requires to obtain
the kernel data structure, and provide per-endianess wrappers.

This result in a kernel that links and even boots in a model.

Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
 arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
 2 files changed, 42 insertions(+), 16 deletions(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index 268be1376f74..09d04dd50eb8 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
 ccflags-y := -D__KVM_NVHE_HYPERVISOR__
 
 hostprogs := gen-hyprel
+HOST_EXTRACFLAGS += -I$(srctree)/include
 
 obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
 	 hyp-main.o hyp-smp.o psci-relay.o
diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
index 58fe31fdba8e..ead02c6a7628 100644
--- a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
+++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
@@ -25,6 +25,7 @@
  */
 
 #include <elf.h>
+#include <endian.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdbool.h>
@@ -36,6 +37,8 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include <generated/autoconf.h>
+
 #define HYP_SECTION_PREFIX		".hyp"
 #define HYP_RELOC_SECTION		".hyp.reloc"
 #define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
@@ -121,6 +124,28 @@ static struct {
 	const char	*sh_string;
 } elf;
 
+#if defined(CONFIG_CPU_LITTLE_ENDIAN)
+
+#define elf16toh(x)	le16toh(x)
+#define elf32toh(x)	le32toh(x)
+#define elf64toh(x)	le64toh(x)
+
+#define ELFENDIAN	ELFDATA2LSB
+
+#elif defined(CONFIG_CPU_BIG_ENDIAN)
+
+#define elf16toh(x)	be16toh(x)
+#define elf32toh(x)	be32toh(x)
+#define elf64toh(x)	be64toh(x)
+
+#define ELFENDIAN	ELFDATA2MSB
+
+#else
+
+#error PDP-endian sadly unsupported...
+
+#endif
+
 #define fatal_error(fmt, ...)						\
 	({								\
 		fprintf(stderr, "error: %s: " fmt "\n",			\
@@ -162,12 +187,12 @@ static struct {
 
 /* Iterate over all sections in the ELF. */
 #define for_each_section(var) \
-	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
+	for (var = elf.sh_table; var < elf.sh_table + elf16toh(elf.ehdr->e_shnum); ++var)
 
 /* Iterate over all Elf64_Rela relocations in a given section. */
 #define for_each_rela(shdr, var)					\
-	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
-	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
+	for (var = elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset));	\
+	     var < elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset) + elf64toh(shdr->sh_size)); var++)
 
 /* True if a string starts with a given prefix. */
 static inline bool starts_with(const char *str, const char *prefix)
@@ -178,13 +203,13 @@ static inline bool starts_with(const char *str, const char *prefix)
 /* Returns a string containing the name of a given section. */
 static inline const char *section_name(Elf64_Shdr *shdr)
 {
-	return elf.sh_string + shdr->sh_name;
+	return elf.sh_string + elf32toh(shdr->sh_name);
 }
 
 /* Returns a pointer to the first byte of section data. */
 static inline const char *section_begin(Elf64_Shdr *shdr)
 {
-	return elf_ptr(char, shdr->sh_offset);
+	return elf_ptr(char, elf64toh(shdr->sh_offset));
 }
 
 /* Find a section by its offset from the beginning of the file. */
@@ -247,13 +272,13 @@ static void init_elf(const char *path)
 
 	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
 	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
-	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
-	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
-	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
+	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFENDIAN, "%u");
+	assert_eq(elf16toh(elf.ehdr->e_type), ET_REL, "%u");
+	assert_eq(elf16toh(elf.ehdr->e_machine), EM_AARCH64, "%u");
 
 	/* Populate fields of the global struct. */
-	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
-	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
+	elf.sh_table = section_by_off(elf64toh(elf.ehdr->e_shoff));
+	elf.sh_string = section_begin(section_by_idx(elf16toh(elf.ehdr->e_shstrndx)));
 }
 
 /* Print the prologue of the output ASM file. */
@@ -301,8 +326,8 @@ static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
 	 * is `rela->r_offset`.
 	 */
 	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
-		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
-		rela->r_offset);
+	       reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
+	       elf64toh(rela->r_offset));
 
 	reloc_offset += 4;
 }
@@ -322,7 +347,7 @@ static void emit_epilogue(void)
  */
 static void emit_rela_section(Elf64_Shdr *sh_rela)
 {
-	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
+	Elf64_Shdr *sh_orig = &elf.sh_table[elf32toh(sh_rela->sh_info)];
 	const char *sh_orig_name = section_name(sh_orig);
 	Elf64_Rela *rela;
 
@@ -333,10 +358,10 @@ static void emit_rela_section(Elf64_Shdr *sh_rela)
 	emit_section_prologue(sh_orig_name);
 
 	for_each_rela(sh_rela, rela) {
-		uint32_t type = (uint32_t)rela->r_info;
+		uint32_t type = (uint32_t)elf64toh(rela->r_info);
 
 		/* Check that rela points inside the relocated section. */
-		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
+		assert_lt(elf64toh(rela->r_offset), elf64toh(sh_orig->sh_size), "0x%lx");
 
 		switch (type) {
 		/*
@@ -385,7 +410,7 @@ static void emit_all_relocs(void)
 	Elf64_Shdr *shdr;
 
 	for_each_section(shdr) {
-		switch (shdr->sh_type) {
+		switch (elf32toh(shdr->sh_type)) {
 		case SHT_REL:
 			fatal_error("Unexpected SHT_REL section \"%s\"",
 				section_name(shdr));
-- 
2.29.2


-- 
Without deviation from the norm, progress is not possible.

_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
  2021-01-30 13:44       ` Marc Zyngier
  (?)
@ 2021-01-30 16:11         ` Guenter Roeck
  -1 siblings, 0 replies; 57+ messages in thread
From: Guenter Roeck @ 2021-01-30 16:11 UTC (permalink / raw)
  To: Marc Zyngier
  Cc: David Brazdil, kvmarm, Mark Rutland, Suzuki K Poulose,
	Catalin Marinas, linux-kernel, James Morse, linux-arm-kernel,
	Will Deacon, Ard Biesheuvel, Julien Thierry

On Sat, Jan 30, 2021 at 01:44:15PM +0000, Marc Zyngier wrote:
> On Fri, 29 Jan 2021 21:43:25 +0000,
> Guenter Roeck <linux@roeck-us.net> wrote:
> > 
> > Hi,
> > 
> > On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> > > Add a post-processing step to compilation of KVM nVHE hyp code which
> > > calls a custom host tool (gen-hyprel) on the partially linked object
> > > file (hyp sections' names prefixed).
> > > 
> > > The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> > > sections and generates an assembly file that will form a new section
> > > .hyp.reloc in the kernel binary. The new section contains an array of
> > > 32-bit offsets to the positions targeted by these relocations.
> > > 
> > > Since these addresses of those positions will not be determined until
> > > linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> > > relocation with addend <section_base_sym> + <r_offset>. The linker of
> > > `vmlinux` will therefore fill the slot accordingly.
> > > 
> > > This relocation data will be used at runtime to convert the kernel VAs
> > > at those positions to hyp VAs.
> > > 
> > > Signed-off-by: David Brazdil <dbrazdil@google.com>
> > 
> > This patch results in the following error for me.
> > 
> > error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> > 
> > The problem is seen when trying to build aarch64 images in big endian
> > mode.
> > 
> > Te script used to reproduce the problem as well as bisect results are
> > attached.
> 
> I came up with the following patch, which allows the kernel to link
> and boot. I don't have any BE userspace, so I didn't verify that I
> could boot a guest (the hypervisor does correctly initialise though).
> 
> It's not exactly pretty, but it does the job...
> 
> Thanks,
> 
> 	M.
> 
> From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
> From: Marc Zyngier <maz@kernel.org>
> Date: Sat, 30 Jan 2021 13:07:51 +0000
> Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic
> 
> gen-hyprel is, for better or worse, a native-endian program:
> it assumes that the ELF data structures are in the host's
> endianness, and even assumes that the compiled kernel is
> little-endian in one particular case.
> 
> None of these assumptions hold true though: people actually build
> (use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
> Madness!
> 
> In order to solve this, wrap each access to the ELF data structures
> with the required byte-swapping magic. This requires to obtain
> the kernel data structure, and provide per-endianess wrappers.
> 
> This result in a kernel that links and even boots in a model.
> 
> Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Tested-by: Guenter Roeck <linux@roeck-us.net>

Compiles and boots both big- and little-endian systems in qemu.

Guenter

> ---
>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
>  2 files changed, 42 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
> index 268be1376f74..09d04dd50eb8 100644
> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>  
>  hostprogs := gen-hyprel
> +HOST_EXTRACFLAGS += -I$(srctree)/include
>  
>  obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
>  	 hyp-main.o hyp-smp.o psci-relay.o
> diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> index 58fe31fdba8e..ead02c6a7628 100644
> --- a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> +++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> @@ -25,6 +25,7 @@
>   */
>  
>  #include <elf.h>
> +#include <endian.h>
>  #include <errno.h>
>  #include <fcntl.h>
>  #include <stdbool.h>
> @@ -36,6 +37,8 @@
>  #include <sys/stat.h>
>  #include <unistd.h>
>  
> +#include <generated/autoconf.h>
> +
>  #define HYP_SECTION_PREFIX		".hyp"
>  #define HYP_RELOC_SECTION		".hyp.reloc"
>  #define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
> @@ -121,6 +124,28 @@ static struct {
>  	const char	*sh_string;
>  } elf;
>  
> +#if defined(CONFIG_CPU_LITTLE_ENDIAN)
> +
> +#define elf16toh(x)	le16toh(x)
> +#define elf32toh(x)	le32toh(x)
> +#define elf64toh(x)	le64toh(x)
> +
> +#define ELFENDIAN	ELFDATA2LSB
> +
> +#elif defined(CONFIG_CPU_BIG_ENDIAN)
> +
> +#define elf16toh(x)	be16toh(x)
> +#define elf32toh(x)	be32toh(x)
> +#define elf64toh(x)	be64toh(x)
> +
> +#define ELFENDIAN	ELFDATA2MSB
> +
> +#else
> +
> +#error PDP-endian sadly unsupported...
> +
> +#endif
> +
>  #define fatal_error(fmt, ...)						\
>  	({								\
>  		fprintf(stderr, "error: %s: " fmt "\n",			\
> @@ -162,12 +187,12 @@ static struct {
>  
>  /* Iterate over all sections in the ELF. */
>  #define for_each_section(var) \
> -	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
> +	for (var = elf.sh_table; var < elf.sh_table + elf16toh(elf.ehdr->e_shnum); ++var)
>  
>  /* Iterate over all Elf64_Rela relocations in a given section. */
>  #define for_each_rela(shdr, var)					\
> -	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
> -	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
> +	for (var = elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset));	\
> +	     var < elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset) + elf64toh(shdr->sh_size)); var++)
>  
>  /* True if a string starts with a given prefix. */
>  static inline bool starts_with(const char *str, const char *prefix)
> @@ -178,13 +203,13 @@ static inline bool starts_with(const char *str, const char *prefix)
>  /* Returns a string containing the name of a given section. */
>  static inline const char *section_name(Elf64_Shdr *shdr)
>  {
> -	return elf.sh_string + shdr->sh_name;
> +	return elf.sh_string + elf32toh(shdr->sh_name);
>  }
>  
>  /* Returns a pointer to the first byte of section data. */
>  static inline const char *section_begin(Elf64_Shdr *shdr)
>  {
> -	return elf_ptr(char, shdr->sh_offset);
> +	return elf_ptr(char, elf64toh(shdr->sh_offset));
>  }
>  
>  /* Find a section by its offset from the beginning of the file. */
> @@ -247,13 +272,13 @@ static void init_elf(const char *path)
>  
>  	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
>  	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
> -	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
> -	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
> -	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
> +	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFENDIAN, "%u");
> +	assert_eq(elf16toh(elf.ehdr->e_type), ET_REL, "%u");
> +	assert_eq(elf16toh(elf.ehdr->e_machine), EM_AARCH64, "%u");
>  
>  	/* Populate fields of the global struct. */
> -	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
> -	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
> +	elf.sh_table = section_by_off(elf64toh(elf.ehdr->e_shoff));
> +	elf.sh_string = section_begin(section_by_idx(elf16toh(elf.ehdr->e_shstrndx)));
>  }
>  
>  /* Print the prologue of the output ASM file. */
> @@ -301,8 +326,8 @@ static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
>  	 * is `rela->r_offset`.
>  	 */
>  	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
> -		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
> -		rela->r_offset);
> +	       reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
> +	       elf64toh(rela->r_offset));
>  
>  	reloc_offset += 4;
>  }
> @@ -322,7 +347,7 @@ static void emit_epilogue(void)
>   */
>  static void emit_rela_section(Elf64_Shdr *sh_rela)
>  {
> -	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
> +	Elf64_Shdr *sh_orig = &elf.sh_table[elf32toh(sh_rela->sh_info)];
>  	const char *sh_orig_name = section_name(sh_orig);
>  	Elf64_Rela *rela;
>  
> @@ -333,10 +358,10 @@ static void emit_rela_section(Elf64_Shdr *sh_rela)
>  	emit_section_prologue(sh_orig_name);
>  
>  	for_each_rela(sh_rela, rela) {
> -		uint32_t type = (uint32_t)rela->r_info;
> +		uint32_t type = (uint32_t)elf64toh(rela->r_info);
>  
>  		/* Check that rela points inside the relocated section. */
> -		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
> +		assert_lt(elf64toh(rela->r_offset), elf64toh(sh_orig->sh_size), "0x%lx");
>  
>  		switch (type) {
>  		/*
> @@ -385,7 +410,7 @@ static void emit_all_relocs(void)
>  	Elf64_Shdr *shdr;
>  
>  	for_each_section(shdr) {
> -		switch (shdr->sh_type) {
> +		switch (elf32toh(shdr->sh_type)) {
>  		case SHT_REL:
>  			fatal_error("Unexpected SHT_REL section \"%s\"",
>  				section_name(shdr));
> -- 
> 2.29.2
> 
> 
> -- 
> Without deviation from the norm, progress is not possible.

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-30 16:11         ` Guenter Roeck
  0 siblings, 0 replies; 57+ messages in thread
From: Guenter Roeck @ 2021-01-30 16:11 UTC (permalink / raw)
  To: Marc Zyngier
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, Will Deacon,
	kvmarm, linux-arm-kernel

On Sat, Jan 30, 2021 at 01:44:15PM +0000, Marc Zyngier wrote:
> On Fri, 29 Jan 2021 21:43:25 +0000,
> Guenter Roeck <linux@roeck-us.net> wrote:
> > 
> > Hi,
> > 
> > On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> > > Add a post-processing step to compilation of KVM nVHE hyp code which
> > > calls a custom host tool (gen-hyprel) on the partially linked object
> > > file (hyp sections' names prefixed).
> > > 
> > > The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> > > sections and generates an assembly file that will form a new section
> > > .hyp.reloc in the kernel binary. The new section contains an array of
> > > 32-bit offsets to the positions targeted by these relocations.
> > > 
> > > Since these addresses of those positions will not be determined until
> > > linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> > > relocation with addend <section_base_sym> + <r_offset>. The linker of
> > > `vmlinux` will therefore fill the slot accordingly.
> > > 
> > > This relocation data will be used at runtime to convert the kernel VAs
> > > at those positions to hyp VAs.
> > > 
> > > Signed-off-by: David Brazdil <dbrazdil@google.com>
> > 
> > This patch results in the following error for me.
> > 
> > error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> > 
> > The problem is seen when trying to build aarch64 images in big endian
> > mode.
> > 
> > Te script used to reproduce the problem as well as bisect results are
> > attached.
> 
> I came up with the following patch, which allows the kernel to link
> and boot. I don't have any BE userspace, so I didn't verify that I
> could boot a guest (the hypervisor does correctly initialise though).
> 
> It's not exactly pretty, but it does the job...
> 
> Thanks,
> 
> 	M.
> 
> From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
> From: Marc Zyngier <maz@kernel.org>
> Date: Sat, 30 Jan 2021 13:07:51 +0000
> Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic
> 
> gen-hyprel is, for better or worse, a native-endian program:
> it assumes that the ELF data structures are in the host's
> endianness, and even assumes that the compiled kernel is
> little-endian in one particular case.
> 
> None of these assumptions hold true though: people actually build
> (use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
> Madness!
> 
> In order to solve this, wrap each access to the ELF data structures
> with the required byte-swapping magic. This requires to obtain
> the kernel data structure, and provide per-endianess wrappers.
> 
> This result in a kernel that links and even boots in a model.
> 
> Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Tested-by: Guenter Roeck <linux@roeck-us.net>

Compiles and boots both big- and little-endian systems in qemu.

Guenter

> ---
>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
>  2 files changed, 42 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
> index 268be1376f74..09d04dd50eb8 100644
> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>  
>  hostprogs := gen-hyprel
> +HOST_EXTRACFLAGS += -I$(srctree)/include
>  
>  obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
>  	 hyp-main.o hyp-smp.o psci-relay.o
> diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> index 58fe31fdba8e..ead02c6a7628 100644
> --- a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> +++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> @@ -25,6 +25,7 @@
>   */
>  
>  #include <elf.h>
> +#include <endian.h>
>  #include <errno.h>
>  #include <fcntl.h>
>  #include <stdbool.h>
> @@ -36,6 +37,8 @@
>  #include <sys/stat.h>
>  #include <unistd.h>
>  
> +#include <generated/autoconf.h>
> +
>  #define HYP_SECTION_PREFIX		".hyp"
>  #define HYP_RELOC_SECTION		".hyp.reloc"
>  #define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
> @@ -121,6 +124,28 @@ static struct {
>  	const char	*sh_string;
>  } elf;
>  
> +#if defined(CONFIG_CPU_LITTLE_ENDIAN)
> +
> +#define elf16toh(x)	le16toh(x)
> +#define elf32toh(x)	le32toh(x)
> +#define elf64toh(x)	le64toh(x)
> +
> +#define ELFENDIAN	ELFDATA2LSB
> +
> +#elif defined(CONFIG_CPU_BIG_ENDIAN)
> +
> +#define elf16toh(x)	be16toh(x)
> +#define elf32toh(x)	be32toh(x)
> +#define elf64toh(x)	be64toh(x)
> +
> +#define ELFENDIAN	ELFDATA2MSB
> +
> +#else
> +
> +#error PDP-endian sadly unsupported...
> +
> +#endif
> +
>  #define fatal_error(fmt, ...)						\
>  	({								\
>  		fprintf(stderr, "error: %s: " fmt "\n",			\
> @@ -162,12 +187,12 @@ static struct {
>  
>  /* Iterate over all sections in the ELF. */
>  #define for_each_section(var) \
> -	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
> +	for (var = elf.sh_table; var < elf.sh_table + elf16toh(elf.ehdr->e_shnum); ++var)
>  
>  /* Iterate over all Elf64_Rela relocations in a given section. */
>  #define for_each_rela(shdr, var)					\
> -	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
> -	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
> +	for (var = elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset));	\
> +	     var < elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset) + elf64toh(shdr->sh_size)); var++)
>  
>  /* True if a string starts with a given prefix. */
>  static inline bool starts_with(const char *str, const char *prefix)
> @@ -178,13 +203,13 @@ static inline bool starts_with(const char *str, const char *prefix)
>  /* Returns a string containing the name of a given section. */
>  static inline const char *section_name(Elf64_Shdr *shdr)
>  {
> -	return elf.sh_string + shdr->sh_name;
> +	return elf.sh_string + elf32toh(shdr->sh_name);
>  }
>  
>  /* Returns a pointer to the first byte of section data. */
>  static inline const char *section_begin(Elf64_Shdr *shdr)
>  {
> -	return elf_ptr(char, shdr->sh_offset);
> +	return elf_ptr(char, elf64toh(shdr->sh_offset));
>  }
>  
>  /* Find a section by its offset from the beginning of the file. */
> @@ -247,13 +272,13 @@ static void init_elf(const char *path)
>  
>  	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
>  	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
> -	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
> -	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
> -	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
> +	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFENDIAN, "%u");
> +	assert_eq(elf16toh(elf.ehdr->e_type), ET_REL, "%u");
> +	assert_eq(elf16toh(elf.ehdr->e_machine), EM_AARCH64, "%u");
>  
>  	/* Populate fields of the global struct. */
> -	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
> -	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
> +	elf.sh_table = section_by_off(elf64toh(elf.ehdr->e_shoff));
> +	elf.sh_string = section_begin(section_by_idx(elf16toh(elf.ehdr->e_shstrndx)));
>  }
>  
>  /* Print the prologue of the output ASM file. */
> @@ -301,8 +326,8 @@ static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
>  	 * is `rela->r_offset`.
>  	 */
>  	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
> -		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
> -		rela->r_offset);
> +	       reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
> +	       elf64toh(rela->r_offset));
>  
>  	reloc_offset += 4;
>  }
> @@ -322,7 +347,7 @@ static void emit_epilogue(void)
>   */
>  static void emit_rela_section(Elf64_Shdr *sh_rela)
>  {
> -	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
> +	Elf64_Shdr *sh_orig = &elf.sh_table[elf32toh(sh_rela->sh_info)];
>  	const char *sh_orig_name = section_name(sh_orig);
>  	Elf64_Rela *rela;
>  
> @@ -333,10 +358,10 @@ static void emit_rela_section(Elf64_Shdr *sh_rela)
>  	emit_section_prologue(sh_orig_name);
>  
>  	for_each_rela(sh_rela, rela) {
> -		uint32_t type = (uint32_t)rela->r_info;
> +		uint32_t type = (uint32_t)elf64toh(rela->r_info);
>  
>  		/* Check that rela points inside the relocated section. */
> -		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
> +		assert_lt(elf64toh(rela->r_offset), elf64toh(sh_orig->sh_size), "0x%lx");
>  
>  		switch (type) {
>  		/*
> @@ -385,7 +410,7 @@ static void emit_all_relocs(void)
>  	Elf64_Shdr *shdr;
>  
>  	for_each_section(shdr) {
> -		switch (shdr->sh_type) {
> +		switch (elf32toh(shdr->sh_type)) {
>  		case SHT_REL:
>  			fatal_error("Unexpected SHT_REL section \"%s\"",
>  				section_name(shdr));
> -- 
> 2.29.2
> 
> 
> -- 
> Without deviation from the norm, progress is not possible.
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-30 16:11         ` Guenter Roeck
  0 siblings, 0 replies; 57+ messages in thread
From: Guenter Roeck @ 2021-01-30 16:11 UTC (permalink / raw)
  To: Marc Zyngier
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, Julien Thierry, David Brazdil,
	Will Deacon, kvmarm, linux-arm-kernel

On Sat, Jan 30, 2021 at 01:44:15PM +0000, Marc Zyngier wrote:
> On Fri, 29 Jan 2021 21:43:25 +0000,
> Guenter Roeck <linux@roeck-us.net> wrote:
> > 
> > Hi,
> > 
> > On Tue, Jan 05, 2021 at 06:05:37PM +0000, David Brazdil wrote:
> > > Add a post-processing step to compilation of KVM nVHE hyp code which
> > > calls a custom host tool (gen-hyprel) on the partially linked object
> > > file (hyp sections' names prefixed).
> > > 
> > > The tool lists all R_AARCH64_ABS64 data relocations targeting hyp
> > > sections and generates an assembly file that will form a new section
> > > .hyp.reloc in the kernel binary. The new section contains an array of
> > > 32-bit offsets to the positions targeted by these relocations.
> > > 
> > > Since these addresses of those positions will not be determined until
> > > linking of `vmlinux`, each 32-bit entry carries a R_AARCH64_PREL32
> > > relocation with addend <section_base_sym> + <r_offset>. The linker of
> > > `vmlinux` will therefore fill the slot accordingly.
> > > 
> > > This relocation data will be used at runtime to convert the kernel VAs
> > > at those positions to hyp VAs.
> > > 
> > > Signed-off-by: David Brazdil <dbrazdil@google.com>
> > 
> > This patch results in the following error for me.
> > 
> > error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: assertion elf.ehdr->e_ident[5] == 1 failed (lhs=2, rhs=1, line=250)
> > 
> > The problem is seen when trying to build aarch64 images in big endian
> > mode.
> > 
> > Te script used to reproduce the problem as well as bisect results are
> > attached.
> 
> I came up with the following patch, which allows the kernel to link
> and boot. I don't have any BE userspace, so I didn't verify that I
> could boot a guest (the hypervisor does correctly initialise though).
> 
> It's not exactly pretty, but it does the job...
> 
> Thanks,
> 
> 	M.
> 
> From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
> From: Marc Zyngier <maz@kernel.org>
> Date: Sat, 30 Jan 2021 13:07:51 +0000
> Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic
> 
> gen-hyprel is, for better or worse, a native-endian program:
> it assumes that the ELF data structures are in the host's
> endianness, and even assumes that the compiled kernel is
> little-endian in one particular case.
> 
> None of these assumptions hold true though: people actually build
> (use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
> Madness!
> 
> In order to solve this, wrap each access to the ELF data structures
> with the required byte-swapping magic. This requires to obtain
> the kernel data structure, and provide per-endianess wrappers.
> 
> This result in a kernel that links and even boots in a model.
> 
> Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Tested-by: Guenter Roeck <linux@roeck-us.net>

Compiles and boots both big- and little-endian systems in qemu.

Guenter

> ---
>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
>  2 files changed, 42 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
> index 268be1376f74..09d04dd50eb8 100644
> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>  
>  hostprogs := gen-hyprel
> +HOST_EXTRACFLAGS += -I$(srctree)/include
>  
>  obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \
>  	 hyp-main.o hyp-smp.o psci-relay.o
> diff --git a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> index 58fe31fdba8e..ead02c6a7628 100644
> --- a/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> +++ b/arch/arm64/kvm/hyp/nvhe/gen-hyprel.c
> @@ -25,6 +25,7 @@
>   */
>  
>  #include <elf.h>
> +#include <endian.h>
>  #include <errno.h>
>  #include <fcntl.h>
>  #include <stdbool.h>
> @@ -36,6 +37,8 @@
>  #include <sys/stat.h>
>  #include <unistd.h>
>  
> +#include <generated/autoconf.h>
> +
>  #define HYP_SECTION_PREFIX		".hyp"
>  #define HYP_RELOC_SECTION		".hyp.reloc"
>  #define HYP_SECTION_SYMBOL_PREFIX	"__hyp_section_"
> @@ -121,6 +124,28 @@ static struct {
>  	const char	*sh_string;
>  } elf;
>  
> +#if defined(CONFIG_CPU_LITTLE_ENDIAN)
> +
> +#define elf16toh(x)	le16toh(x)
> +#define elf32toh(x)	le32toh(x)
> +#define elf64toh(x)	le64toh(x)
> +
> +#define ELFENDIAN	ELFDATA2LSB
> +
> +#elif defined(CONFIG_CPU_BIG_ENDIAN)
> +
> +#define elf16toh(x)	be16toh(x)
> +#define elf32toh(x)	be32toh(x)
> +#define elf64toh(x)	be64toh(x)
> +
> +#define ELFENDIAN	ELFDATA2MSB
> +
> +#else
> +
> +#error PDP-endian sadly unsupported...
> +
> +#endif
> +
>  #define fatal_error(fmt, ...)						\
>  	({								\
>  		fprintf(stderr, "error: %s: " fmt "\n",			\
> @@ -162,12 +187,12 @@ static struct {
>  
>  /* Iterate over all sections in the ELF. */
>  #define for_each_section(var) \
> -	for (var = elf.sh_table; var < elf.sh_table + elf.ehdr->e_shnum; ++var)
> +	for (var = elf.sh_table; var < elf.sh_table + elf16toh(elf.ehdr->e_shnum); ++var)
>  
>  /* Iterate over all Elf64_Rela relocations in a given section. */
>  #define for_each_rela(shdr, var)					\
> -	for (var = elf_ptr(Elf64_Rela, shdr->sh_offset);		\
> -	     var < elf_ptr(Elf64_Rela, shdr->sh_offset + shdr->sh_size); var++)
> +	for (var = elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset));	\
> +	     var < elf_ptr(Elf64_Rela, elf64toh(shdr->sh_offset) + elf64toh(shdr->sh_size)); var++)
>  
>  /* True if a string starts with a given prefix. */
>  static inline bool starts_with(const char *str, const char *prefix)
> @@ -178,13 +203,13 @@ static inline bool starts_with(const char *str, const char *prefix)
>  /* Returns a string containing the name of a given section. */
>  static inline const char *section_name(Elf64_Shdr *shdr)
>  {
> -	return elf.sh_string + shdr->sh_name;
> +	return elf.sh_string + elf32toh(shdr->sh_name);
>  }
>  
>  /* Returns a pointer to the first byte of section data. */
>  static inline const char *section_begin(Elf64_Shdr *shdr)
>  {
> -	return elf_ptr(char, shdr->sh_offset);
> +	return elf_ptr(char, elf64toh(shdr->sh_offset));
>  }
>  
>  /* Find a section by its offset from the beginning of the file. */
> @@ -247,13 +272,13 @@ static void init_elf(const char *path)
>  
>  	/* Sanity check that this is an ELF64 relocatable object for AArch64. */
>  	assert_eq(elf.ehdr->e_ident[EI_CLASS], ELFCLASS64, "%u");
> -	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFDATA2LSB, "%u");
> -	assert_eq(elf.ehdr->e_type, ET_REL, "%u");
> -	assert_eq(elf.ehdr->e_machine, EM_AARCH64, "%u");
> +	assert_eq(elf.ehdr->e_ident[EI_DATA], ELFENDIAN, "%u");
> +	assert_eq(elf16toh(elf.ehdr->e_type), ET_REL, "%u");
> +	assert_eq(elf16toh(elf.ehdr->e_machine), EM_AARCH64, "%u");
>  
>  	/* Populate fields of the global struct. */
> -	elf.sh_table = section_by_off(elf.ehdr->e_shoff);
> -	elf.sh_string = section_begin(section_by_idx(elf.ehdr->e_shstrndx));
> +	elf.sh_table = section_by_off(elf64toh(elf.ehdr->e_shoff));
> +	elf.sh_string = section_begin(section_by_idx(elf16toh(elf.ehdr->e_shstrndx)));
>  }
>  
>  /* Print the prologue of the output ASM file. */
> @@ -301,8 +326,8 @@ static void emit_rela_abs64(Elf64_Rela *rela, const char *sh_orig_name)
>  	 * is `rela->r_offset`.
>  	 */
>  	printf(".reloc %lu, R_AARCH64_PREL32, %s%s + 0x%lx\n",
> -		reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
> -		rela->r_offset);
> +	       reloc_offset, HYP_SECTION_SYMBOL_PREFIX, sh_orig_name,
> +	       elf64toh(rela->r_offset));
>  
>  	reloc_offset += 4;
>  }
> @@ -322,7 +347,7 @@ static void emit_epilogue(void)
>   */
>  static void emit_rela_section(Elf64_Shdr *sh_rela)
>  {
> -	Elf64_Shdr *sh_orig = &elf.sh_table[sh_rela->sh_info];
> +	Elf64_Shdr *sh_orig = &elf.sh_table[elf32toh(sh_rela->sh_info)];
>  	const char *sh_orig_name = section_name(sh_orig);
>  	Elf64_Rela *rela;
>  
> @@ -333,10 +358,10 @@ static void emit_rela_section(Elf64_Shdr *sh_rela)
>  	emit_section_prologue(sh_orig_name);
>  
>  	for_each_rela(sh_rela, rela) {
> -		uint32_t type = (uint32_t)rela->r_info;
> +		uint32_t type = (uint32_t)elf64toh(rela->r_info);
>  
>  		/* Check that rela points inside the relocated section. */
> -		assert_lt(rela->r_offset, sh_orig->sh_size, "0x%lx");
> +		assert_lt(elf64toh(rela->r_offset), elf64toh(sh_orig->sh_size), "0x%lx");
>  
>  		switch (type) {
>  		/*
> @@ -385,7 +410,7 @@ static void emit_all_relocs(void)
>  	Elf64_Shdr *shdr;
>  
>  	for_each_section(shdr) {
> -		switch (shdr->sh_type) {
> +		switch (elf32toh(shdr->sh_type)) {
>  		case SHT_REL:
>  			fatal_error("Unexpected SHT_REL section \"%s\"",
>  				section_name(shdr));
> -- 
> 2.29.2
> 
> 
> -- 
> Without deviation from the norm, progress is not possible.

_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
  2021-01-30 16:11         ` Guenter Roeck
  (?)
@ 2021-01-30 18:10           ` Marc Zyngier
  -1 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 18:10 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: David Brazdil, kvmarm, Mark Rutland, Suzuki K Poulose,
	Catalin Marinas, linux-kernel, James Morse, linux-arm-kernel,
	Will Deacon, Ard Biesheuvel, Julien Thierry

On Sat, 30 Jan 2021 16:11:04 +0000,
Guenter Roeck <linux@roeck-us.net> wrote:
> 
> On Sat, Jan 30, 2021 at 01:44:15PM +0000, Marc Zyngier wrote:
> > From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
> > From: Marc Zyngier <maz@kernel.org>
> > Date: Sat, 30 Jan 2021 13:07:51 +0000
> > Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic
> > 
> > gen-hyprel is, for better or worse, a native-endian program:
> > it assumes that the ELF data structures are in the host's
> > endianness, and even assumes that the compiled kernel is
> > little-endian in one particular case.
> > 
> > None of these assumptions hold true though: people actually build
> > (use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
> > Madness!
> > 
> > In order to solve this, wrap each access to the ELF data structures
> > with the required byte-swapping magic. This requires to obtain
> > the kernel data structure, and provide per-endianess wrappers.
> > 
> > This result in a kernel that links and even boots in a model.
> > 
> > Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
> > Reported-by: Guenter Roeck <linux@roeck-us.net>
> > Signed-off-by: Marc Zyngier <maz@kernel.org>
> 
> Tested-by: Guenter Roeck <linux@roeck-us.net>
> 
> Compiles and boots both big- and little-endian systems in qemu.

Great, thanks for confirming that it fixed this issue. Now applied to
kvm-arm64/hyp-reloc, and pushed out to kvmarm/next.

	M.

-- 
Without deviation from the norm, progress is not possible.

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-30 18:10           ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 18:10 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, Will Deacon,
	kvmarm, linux-arm-kernel

On Sat, 30 Jan 2021 16:11:04 +0000,
Guenter Roeck <linux@roeck-us.net> wrote:
> 
> On Sat, Jan 30, 2021 at 01:44:15PM +0000, Marc Zyngier wrote:
> > From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
> > From: Marc Zyngier <maz@kernel.org>
> > Date: Sat, 30 Jan 2021 13:07:51 +0000
> > Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic
> > 
> > gen-hyprel is, for better or worse, a native-endian program:
> > it assumes that the ELF data structures are in the host's
> > endianness, and even assumes that the compiled kernel is
> > little-endian in one particular case.
> > 
> > None of these assumptions hold true though: people actually build
> > (use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
> > Madness!
> > 
> > In order to solve this, wrap each access to the ELF data structures
> > with the required byte-swapping magic. This requires to obtain
> > the kernel data structure, and provide per-endianess wrappers.
> > 
> > This result in a kernel that links and even boots in a model.
> > 
> > Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
> > Reported-by: Guenter Roeck <linux@roeck-us.net>
> > Signed-off-by: Marc Zyngier <maz@kernel.org>
> 
> Tested-by: Guenter Roeck <linux@roeck-us.net>
> 
> Compiles and boots both big- and little-endian systems in qemu.

Great, thanks for confirming that it fixed this issue. Now applied to
kvm-arm64/hyp-reloc, and pushed out to kvmarm/next.

	M.

-- 
Without deviation from the norm, progress is not possible.
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-01-30 18:10           ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-01-30 18:10 UTC (permalink / raw)
  To: Guenter Roeck
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, Julien Thierry, David Brazdil,
	Will Deacon, kvmarm, linux-arm-kernel

On Sat, 30 Jan 2021 16:11:04 +0000,
Guenter Roeck <linux@roeck-us.net> wrote:
> 
> On Sat, Jan 30, 2021 at 01:44:15PM +0000, Marc Zyngier wrote:
> > From d80ca05b2ed90fc30d328041692fa80f525c8d12 Mon Sep 17 00:00:00 2001
> > From: Marc Zyngier <maz@kernel.org>
> > Date: Sat, 30 Jan 2021 13:07:51 +0000
> > Subject: [PATCH] KVM: arm64: Make gen-hyprel endianness agnostic
> > 
> > gen-hyprel is, for better or worse, a native-endian program:
> > it assumes that the ELF data structures are in the host's
> > endianness, and even assumes that the compiled kernel is
> > little-endian in one particular case.
> > 
> > None of these assumptions hold true though: people actually build
> > (use?) BE arm64 kernels, and seem to avoid doing so on BE hosts.
> > Madness!
> > 
> > In order to solve this, wrap each access to the ELF data structures
> > with the required byte-swapping magic. This requires to obtain
> > the kernel data structure, and provide per-endianess wrappers.
> > 
> > This result in a kernel that links and even boots in a model.
> > 
> > Fixes: 8c49b5d43d4c ("KVM: arm64: Generate hyp relocation data")
> > Reported-by: Guenter Roeck <linux@roeck-us.net>
> > Signed-off-by: Marc Zyngier <maz@kernel.org>
> 
> Tested-by: Guenter Roeck <linux@roeck-us.net>
> 
> Compiles and boots both big- and little-endian systems in qemu.

Great, thanks for confirming that it fixed this issue. Now applied to
kvm-arm64/hyp-reloc, and pushed out to kvmarm/next.

	M.

-- 
Without deviation from the norm, progress is not possible.

_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
  2021-01-30 13:44       ` Marc Zyngier
  (?)
@ 2021-02-01 10:42         ` David Brazdil
  -1 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-02-01 10:42 UTC (permalink / raw)
  To: Marc Zyngier
  Cc: Guenter Roeck, kvmarm, Mark Rutland, Suzuki K Poulose,
	Catalin Marinas, linux-kernel, James Morse, linux-arm-kernel,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Thanks for writing the fix, Marc! There are no corner cases in this code so
if it boots, that should be a good indicator that all BE inputs were converted.

Just one little thing I noticed below, otherwise:
Acked-by: David Brazdil <dbrazdil@google.com>

>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
>  2 files changed, 42 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
> index 268be1376f74..09d04dd50eb8 100644
> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>  
>  hostprogs := gen-hyprel
> +HOST_EXTRACFLAGS += -I$(srctree)/include
This should be $(objtree), autoconf.h is generated.

David

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-02-01 10:42         ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-02-01 10:42 UTC (permalink / raw)
  To: Marc Zyngier
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, linux-arm-kernel,
	Will Deacon, kvmarm, Guenter Roeck

Thanks for writing the fix, Marc! There are no corner cases in this code so
if it boots, that should be a good indicator that all BE inputs were converted.

Just one little thing I noticed below, otherwise:
Acked-by: David Brazdil <dbrazdil@google.com>

>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
>  2 files changed, 42 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
> index 268be1376f74..09d04dd50eb8 100644
> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>  
>  hostprogs := gen-hyprel
> +HOST_EXTRACFLAGS += -I$(srctree)/include
This should be $(objtree), autoconf.h is generated.

David
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-02-01 10:42         ` David Brazdil
  0 siblings, 0 replies; 57+ messages in thread
From: David Brazdil @ 2021-02-01 10:42 UTC (permalink / raw)
  To: Marc Zyngier
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, linux-arm-kernel, Julien Thierry,
	Will Deacon, kvmarm, Guenter Roeck

Thanks for writing the fix, Marc! There are no corner cases in this code so
if it boots, that should be a good indicator that all BE inputs were converted.

Just one little thing I noticed below, otherwise:
Acked-by: David Brazdil <dbrazdil@google.com>

>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 ++++++++++++++++++++--------
>  2 files changed, 42 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
> index 268be1376f74..09d04dd50eb8 100644
> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>  
>  hostprogs := gen-hyprel
> +HOST_EXTRACFLAGS += -I$(srctree)/include
This should be $(objtree), autoconf.h is generated.

David

_______________________________________________
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] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
  2021-02-01 10:42         ` David Brazdil
  (?)
@ 2021-02-01 12:06           ` Marc Zyngier
  -1 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-02-01 12:06 UTC (permalink / raw)
  To: David Brazdil
  Cc: Guenter Roeck, kvmarm, Mark Rutland, Suzuki K Poulose,
	Catalin Marinas, linux-kernel, James Morse, linux-arm-kernel,
	Will Deacon, Ard Biesheuvel, Julien Thierry

Hi David,

On 2021-02-01 10:42, David Brazdil wrote:
> Thanks for writing the fix, Marc! There are no corner cases in this 
> code so
> if it boots, that should be a good indicator that all BE inputs were 
> converted.
> 
> Just one little thing I noticed below, otherwise:
> Acked-by: David Brazdil <dbrazdil@google.com>
> 
>>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 
>> ++++++++++++++++++++--------
>>  2 files changed, 42 insertions(+), 16 deletions(-)
>> 
>> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile 
>> b/arch/arm64/kvm/hyp/nvhe/Makefile
>> index 268be1376f74..09d04dd50eb8 100644
>> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
>> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
>> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>> 
>>  hostprogs := gen-hyprel
>> +HOST_EXTRACFLAGS += -I$(srctree)/include
> This should be $(objtree), autoconf.h is generated.

Ah, well spotted. I build things in place, so it obviously never showed 
up.
Now fixed and pushed out with your Ack.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-02-01 12:06           ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-02-01 12:06 UTC (permalink / raw)
  To: David Brazdil
  Cc: Catalin Marinas, linux-kernel, Ard Biesheuvel, linux-arm-kernel,
	Will Deacon, kvmarm, Guenter Roeck

Hi David,

On 2021-02-01 10:42, David Brazdil wrote:
> Thanks for writing the fix, Marc! There are no corner cases in this 
> code so
> if it boots, that should be a good indicator that all BE inputs were 
> converted.
> 
> Just one little thing I noticed below, otherwise:
> Acked-by: David Brazdil <dbrazdil@google.com>
> 
>>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 
>> ++++++++++++++++++++--------
>>  2 files changed, 42 insertions(+), 16 deletions(-)
>> 
>> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile 
>> b/arch/arm64/kvm/hyp/nvhe/Makefile
>> index 268be1376f74..09d04dd50eb8 100644
>> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
>> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
>> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>> 
>>  hostprogs := gen-hyprel
>> +HOST_EXTRACFLAGS += -I$(srctree)/include
> This should be $(objtree), autoconf.h is generated.

Ah, well spotted. I build things in place, so it obviously never showed 
up.
Now fixed and pushed out with your Ack.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

^ permalink raw reply	[flat|nested] 57+ messages in thread
* Re: [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data
@ 2021-02-01 12:06           ` Marc Zyngier
  0 siblings, 0 replies; 57+ messages in thread
From: Marc Zyngier @ 2021-02-01 12:06 UTC (permalink / raw)
  To: David Brazdil
  Cc: Mark Rutland, Suzuki K Poulose, Catalin Marinas, linux-kernel,
	Ard Biesheuvel, James Morse, linux-arm-kernel, Julien Thierry,
	Will Deacon, kvmarm, Guenter Roeck

Hi David,

On 2021-02-01 10:42, David Brazdil wrote:
> Thanks for writing the fix, Marc! There are no corner cases in this 
> code so
> if it boots, that should be a good indicator that all BE inputs were 
> converted.
> 
> Just one little thing I noticed below, otherwise:
> Acked-by: David Brazdil <dbrazdil@google.com>
> 
>>  arch/arm64/kvm/hyp/nvhe/Makefile     |  1 +
>>  arch/arm64/kvm/hyp/nvhe/gen-hyprel.c | 57 
>> ++++++++++++++++++++--------
>>  2 files changed, 42 insertions(+), 16 deletions(-)
>> 
>> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile 
>> b/arch/arm64/kvm/hyp/nvhe/Makefile
>> index 268be1376f74..09d04dd50eb8 100644
>> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
>> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
>> @@ -7,6 +7,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__
>>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>> 
>>  hostprogs := gen-hyprel
>> +HOST_EXTRACFLAGS += -I$(srctree)/include
> This should be $(objtree), autoconf.h is generated.

Ah, well spotted. I build things in place, so it obviously never showed 
up.
Now fixed and pushed out with your Ack.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...

_______________________________________________
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] 57+ messages in thread
end of thread, other threads:[~2021-02-01 12:08 UTC | newest]

Thread overview: 57+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-05 18:05 [PATCH v2 0/8] arm64: Relocate absolute hyp VAs David Brazdil
2021-01-05 18:05 ` David Brazdil
2021-01-05 18:05 ` David Brazdil
2021-01-05 18:05 ` [PATCH v2 1/8] KVM: arm64: Rename .idmap.text in hyp linker script David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05 ` [PATCH v2 2/8] KVM: arm64: Set up .hyp.rodata ELF section David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05 ` [PATCH v2 3/8] KVM: arm64: Add symbol at the beginning of each hyp section David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-23 13:30   ` Marc Zyngier
2021-01-23 13:30     ` Marc Zyngier
2021-01-23 13:30     ` Marc Zyngier
2021-01-05 18:05 ` [PATCH v2 4/8] KVM: arm64: Generate hyp relocation data David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-29 21:43   ` Guenter Roeck
2021-01-29 21:43     ` Guenter Roeck
2021-01-29 21:43     ` Guenter Roeck
2021-01-30 12:16     ` Marc Zyngier
2021-01-30 12:16       ` Marc Zyngier
2021-01-30 12:16       ` Marc Zyngier
2021-01-30 13:44     ` Marc Zyngier
2021-01-30 13:44       ` Marc Zyngier
2021-01-30 13:44       ` Marc Zyngier
2021-01-30 16:11       ` Guenter Roeck
2021-01-30 16:11         ` Guenter Roeck
2021-01-30 16:11         ` Guenter Roeck
2021-01-30 18:10         ` Marc Zyngier
2021-01-30 18:10           ` Marc Zyngier
2021-01-30 18:10           ` Marc Zyngier
2021-02-01 10:42       ` David Brazdil
2021-02-01 10:42         ` David Brazdil
2021-02-01 10:42         ` David Brazdil
2021-02-01 12:06         ` Marc Zyngier
2021-02-01 12:06           ` Marc Zyngier
2021-02-01 12:06           ` Marc Zyngier
2021-01-05 18:05 ` [PATCH v2 5/8] KVM: arm64: Apply hyp relocations at runtime David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05 ` [PATCH v2 6/8] KVM: arm64: Fix constant-pool users in hyp David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05 ` [PATCH v2 7/8] KVM: arm64: Remove patching of fn pointers " David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05 ` [PATCH v2 8/8] KVM: arm64: Remove hyp_symbol_addr David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-05 18:05   ` David Brazdil
2021-01-23 13:54   ` Marc Zyngier
2021-01-23 13:54     ` Marc Zyngier
2021-01-23 13:54     ` Marc Zyngier
2021-01-23 14:45 ` [PATCH v2 0/8] arm64: Relocate absolute hyp VAs Marc Zyngier
2021-01-23 14:45   ` Marc Zyngier
2021-01-23 14:45   ` Marc Zyngier

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