Re: [PATCH 00/11] Implement generic prot_guest_has() helper function

[Tom Lendacky <thomas.lendacky@amd.com>]

On 8/8/21 8:41 PM, Kuppuswamy, Sathyanarayanan wrote:
> Hi Tom,
> 
> On 7/27/21 3:26 PM, Tom Lendacky wrote:
>> This patch series provides a generic helper function, prot_guest_has(),
>> to replace the sme_active(), sev_active(), sev_es_active() and
>> mem_encrypt_active() functions.
>>
>> It is expected that as new protected virtualization technologies are
>> added to the kernel, they can all be covered by a single function call
>> instead of a collection of specific function calls all called from the
>> same locations.
>>
>> The powerpc and s390 patches have been compile tested only. Can the
>> folks copied on this series verify that nothing breaks for them.
> 
> With this patch set, select ARCH_HAS_PROTECTED_GUEST and set
> CONFIG_AMD_MEM_ENCRYPT=n, creates following error.
> 
> ld: arch/x86/mm/ioremap.o: in function `early_memremap_is_setup_data':
> arch/x86/mm/ioremap.c:672: undefined reference to `early_memremap_decrypted'
> 
> It looks like early_memremap_is_setup_data() is not protected with
> appropriate config.

Ok, thanks for finding that. I'll fix that.

Thanks,
Tom

> 
> 
>>
>> Cc: Andi Kleen <ak@linux.intel.com>
>> Cc: Andy Lutomirski <luto@kernel.org>
>> Cc: Ard Biesheuvel <ardb@kernel.org>
>> Cc: Baoquan He <bhe@redhat.com>
>> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
>> Cc: Borislav Petkov <bp@alien8.de>
>> Cc: Christian Borntraeger <borntraeger@de.ibm.com>
>> Cc: Daniel Vetter <daniel@ffwll.ch>
>> Cc: Dave Hansen <dave.hansen@linux.intel.com>
>> Cc: Dave Young <dyoung@redhat.com>
>> Cc: David Airlie <airlied@linux.ie>
>> Cc: Heiko Carstens <hca@linux.ibm.com>
>> Cc: Ingo Molnar <mingo@redhat.com>
>> Cc: Joerg Roedel <joro@8bytes.org>
>> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
>> Cc: Maxime Ripard <mripard@kernel.org>
>> Cc: Michael Ellerman <mpe@ellerman.id.au>
>> Cc: Paul Mackerras <paulus@samba.org>
>> Cc: Peter Zijlstra <peterz@infradead.org>
>> Cc: Thomas Gleixner <tglx@linutronix.de>
>> Cc: Thomas Zimmermann <tzimmermann@suse.de>
>> Cc: Vasily Gorbik <gor@linux.ibm.com>
>> Cc: VMware Graphics <linux-graphics-maintainer@vmware.com>
>> Cc: Will Deacon <will@kernel.org>
>>
>> ---
>>
>> Patches based on:
>>   
>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgit.kernel.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftip%2Ftip.git&amp;data=04%7C01%7Cthomas.lendacky%40amd.com%7C563b5e30a3254f6739aa08d95ad6e242%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637640701228434514%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=vx9v4EmYqVTsJ7KSr97gQaBWJ%2Fq%2BE9NOzXMhe3Fp7T8%3D&amp;reserved=0
>> master
>>    commit 79e920060fa7 ("Merge branch 'WIP/fixes'")
>>
>> Tom Lendacky (11):
>>    mm: Introduce a function to check for virtualization protection
>>      features
>>    x86/sev: Add an x86 version of prot_guest_has()
>>    powerpc/pseries/svm: Add a powerpc version of prot_guest_has()
>>    x86/sme: Replace occurrences of sme_active() with prot_guest_has()
>>    x86/sev: Replace occurrences of sev_active() with prot_guest_has()
>>    x86/sev: Replace occurrences of sev_es_active() with prot_guest_has()
>>    treewide: Replace the use of mem_encrypt_active() with
>>      prot_guest_has()
>>    mm: Remove the now unused mem_encrypt_active() function
>>    x86/sev: Remove the now unused mem_encrypt_active() function
>>    powerpc/pseries/svm: Remove the now unused mem_encrypt_active()
>>      function
>>    s390/mm: Remove the now unused mem_encrypt_active() function
>>
>>   arch/Kconfig                               |  3 ++
>>   arch/powerpc/include/asm/mem_encrypt.h     |  5 --
>>   arch/powerpc/include/asm/protected_guest.h | 30 +++++++++++
>>   arch/powerpc/platforms/pseries/Kconfig     |  1 +
>>   arch/s390/include/asm/mem_encrypt.h        |  2 -
>>   arch/x86/Kconfig                           |  1 +
>>   arch/x86/include/asm/kexec.h               |  2 +-
>>   arch/x86/include/asm/mem_encrypt.h         | 13 +----
>>   arch/x86/include/asm/protected_guest.h     | 27 ++++++++++
>>   arch/x86/kernel/crash_dump_64.c            |  4 +-
>>   arch/x86/kernel/head64.c                   |  4 +-
>>   arch/x86/kernel/kvm.c                      |  3 +-
>>   arch/x86/kernel/kvmclock.c                 |  4 +-
>>   arch/x86/kernel/machine_kexec_64.c         | 19 +++----
>>   arch/x86/kernel/pci-swiotlb.c              |  9 ++--
>>   arch/x86/kernel/relocate_kernel_64.S       |  2 +-
>>   arch/x86/kernel/sev.c                      |  6 +--
>>   arch/x86/kvm/svm/svm.c                     |  3 +-
>>   arch/x86/mm/ioremap.c                      | 16 +++---
>>   arch/x86/mm/mem_encrypt.c                  | 60 +++++++++++++++-------
>>   arch/x86/mm/mem_encrypt_identity.c         |  3 +-
>>   arch/x86/mm/pat/set_memory.c               |  3 +-
>>   arch/x86/platform/efi/efi_64.c             |  9 ++--
>>   arch/x86/realmode/init.c                   |  8 +--
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |  4 +-
>>   drivers/gpu/drm/drm_cache.c                |  4 +-
>>   drivers/gpu/drm/vmwgfx/vmwgfx_drv.c        |  4 +-
>>   drivers/gpu/drm/vmwgfx/vmwgfx_msg.c        |  6 +--
>>   drivers/iommu/amd/init.c                   |  7 +--
>>   drivers/iommu/amd/iommu.c                  |  3 +-
>>   drivers/iommu/amd/iommu_v2.c               |  3 +-
>>   drivers/iommu/iommu.c                      |  3 +-
>>   fs/proc/vmcore.c                           |  6 +--
>>   include/linux/mem_encrypt.h                |  4 --
>>   include/linux/protected_guest.h            | 37 +++++++++++++
>>   kernel/dma/swiotlb.c                       |  4 +-
>>   36 files changed, 218 insertions(+), 104 deletions(-)
>>   create mode 100644 arch/powerpc/include/asm/protected_guest.h
>>   create mode 100644 arch/x86/include/asm/protected_guest.h
>>   create mode 100644 include/linux/protected_guest.h
>>
>