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

From: Tom Lendacky
Date: Tue Jul 27 2021 - 18:37:52 EST


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@xxxxxxxxxxxxxxx>
> Cc: Andy Lutomirski <luto@xxxxxxxxxx>
> Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>
> Cc: Baoquan He <bhe@xxxxxxxxxx>
> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: Dave Young <dyoung@xxxxxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Joerg Roedel <joro@xxxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Maxime Ripard <mripard@xxxxxxxxxx>
> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> Cc: Paul Mackerras <paulus@xxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
> Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
> Cc: VMware Graphics <linux-graphics-maintainer@xxxxxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
>
> ---
>
> 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
>