KVM: x86/mmu: Expand and clean up page fault stats

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Expand and clean up the page fault stats.  The current stats are at best
incomplete, and at worst misleading.  Differentiate between faults that
are actually fixed vs those that result in an MMIO SPTE being created,
track faults that are spurious, faults that trigger emulation, faults
that that are fixed in the fast path, and last but not least, track the
number of faults that are taken.

Note, the number of faults that require emulation for write-protected
shadow pages can roughly be calculated by subtracting the number of MMIO
SPTEs created from the overall number of faults that trigger emulation.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220423034752.1161007-10-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 03:47:49 +00:00 • committed by Paolo Bonzini

parent 8d5265b101

commit 1075d41efd

6 changed files with 42 additions and 12 deletions

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5

arch/x86/include/asm/kvm_host.h

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arch/x86/kvm/mmu/mmu.c

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arch/x86/kvm/mmu/mmu_internal.h

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arch/x86/kvm/mmu/paging_tmpl.h

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arch/x86/kvm/mmu/tdp_mmu.c

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arch/x86/kvm/x86.c

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