KVM: x86/mmu: Drop non-PA bits when getting GFN for guest's PGD

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Drop non-PA bits when getting GFN for guest's PGD with the maximum theoretical
mask for guest MAXPHYADDR.

Do it unconditionally because it's harmless for 32-bit guests, querying 64-bit
mode would be more expensive, and for EPT the mask isn't tied to guest mode.
Using PT_BASE_ADDR_MASK would be technically wrong (PAE paging has 64-bit
elements _except_ for CR3, which has only 32 valid bits), it wouldn't matter
in practice though.

Opportunistically use GENMASK_ULL() to define __PT_BASE_ADDR_MASK.

Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Tested-by: Xuelian Guo <xuelian.guo@intel.com>
Link: https://lore.kernel.org/r/20230913124227.12574-6-binbin.wu@linux.intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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This commit is contained in:

Binbin Wu 2023-09-13 20:42:16 +08:00 • committed by Sean Christopherson

parent 538ac9a92d

commit a130066f74

3 changed files with 3 additions and 2 deletions

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arch/x86/kvm/mmu/mmu.c

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1

arch/x86/kvm/mmu/mmu_internal.h

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2

arch/x86/kvm/mmu/paging_tmpl.h

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