KVM: x86/mmu: Don't treat fully writable SPTEs as volatile (modulo A/D)

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Don't treat SPTEs that are truly writable, i.e. writable in hardware, as
being volatile (unless they're volatile for other reasons, e.g. A/D bits).
KVM _sets_ the WRITABLE bit out of mmu_lock, but never _clears_ the bit
out of mmu_lock, so if the WRITABLE bit is set, it cannot magically get
cleared just because the SPTE is MMU-writable.

Rename the wrapper of MMU-writable to be more literal, the previous name
of spte_can_locklessly_be_made_writable() is wrong and misleading.

Fixes: c7ba5b48cc ("KVM: MMU: fast path of handling guest page fault")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220423034752.1161007-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Sean Christopherson 2022-04-23 03:47:41 +00:00 • committed by Paolo Bonzini

parent 44187235cb

commit 706c9c55e5

2 changed files with 10 additions and 9 deletions

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17

arch/x86/kvm/mmu/mmu.c

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2

arch/x86/kvm/mmu/spte.h

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