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

[Tom Lendacky]

On 7/27/21 5:26 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.

I wanted to get this out before I head out on vacation at the end of the
week. I'll only be out for a week, but I won't be able to respond to any
feedback until I get back.

I'm still not a fan of the name prot_guest_has() because it is used for
some baremetal checks, but really haven't been able to come up with
anything better. So take it with a grain of salt where the sme_active()
calls are replaced by prot_guest_has().

Also, let me know if the treewide changes in patch #7 need to be further
split out by tree.

Thanks,
Tom

> 
> Cc: Andi Kleen <ak at linux.intel.com>
> Cc: Andy Lutomirski <luto at kernel.org>
> Cc: Ard Biesheuvel <ardb at kernel.org>
> Cc: Baoquan He <bhe at redhat.com>
> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> Cc: Borislav Petkov <bp at alien8.de>
> Cc: Christian Borntraeger <borntraeger at de.ibm.com>
> Cc: Daniel Vetter <daniel at ffwll.ch>
> Cc: Dave Hansen <dave.hansen at linux.intel.com>
> Cc: Dave Young <dyoung at redhat.com>
> Cc: David Airlie <airlied at linux.ie>
> Cc: Heiko Carstens <hca at linux.ibm.com>
> Cc: Ingo Molnar <mingo at redhat.com>
> Cc: Joerg Roedel <joro at 8bytes.org>
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Maxime Ripard <mripard at kernel.org>
> Cc: Michael Ellerman <mpe at ellerman.id.au>
> Cc: Paul Mackerras <paulus at samba.org>
> Cc: Peter Zijlstra <peterz at infradead.org>
> Cc: Thomas Gleixner <tglx at linutronix.de>
> Cc: Thomas Zimmermann <tzimmermann at suse.de>
> Cc: Vasily Gorbik <gor at linux.ibm.com>
> Cc: VMware Graphics <linux-graphics-maintainer at vmware.com>
> Cc: Will Deacon <will at kernel.org>
> 
> ---
> 
> Patches based on:
>   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 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
>