KVM: x86/mmu: Skip mmu_notifier check when handling MMIO page fault

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Don't retry a page fault due to an mmu_notifier invalidation when
handling a page fault for a GPA that did not resolve to a memslot, i.e.
an MMIO page fault.  Invalidations from the mmu_notifier signal a change
in a host virtual address (HVA) mapping; without a memslot, there is no
HVA and thus no possibility that the invalidation is relevant to the
page fault being handled.

Note, the MMIO vs. memslot generation checks handle the case where a
pending memslot will create a memslot overlapping the faulting GPA.  The
mmu_notifier checks are orthogonal to memslot updates.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210222024522.1751719-2-stevensd@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-02-22 11:45:21 +09:00 • committed by Paolo Bonzini

parent 356c7558d4

commit 5f8a7cf25a

2 changed files with 2 additions and 2 deletions

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arch/x86/kvm/mmu/mmu.c

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2

arch/x86/kvm/mmu/paging_tmpl.h

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