diff options
| author | Sean Christopherson <seanjc@google.com> | 2022-04-23 06:47:49 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-05-12 16:51:43 +0300 |
| commit | 1075d41efd598d3fd4d52a1e1116b20979975135 (patch) | |
| tree | 4ab75f1e4e2f0893dd209e8dc8894d06ec7ebdee /arch/x86/kvm/mmu/tdp_mmu.c | |
| parent | 8d5265b1016369836c0735ed40933e179f186630 (diff) | |
| download | linux-1075d41efd598d3fd4d52a1e1116b20979975135.tar.xz | |
KVM: x86/mmu: Expand and clean up page fault stats
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>
Diffstat (limited to 'arch/x86/kvm/mmu/tdp_mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu/tdp_mmu.c | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 7fc4ead5ce0d..841feaa48be5 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -1100,6 +1100,7 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, /* If a MMIO SPTE is installed, the MMIO will need to be emulated. */ if (unlikely(is_mmio_spte(new_spte))) { + vcpu->stat.pf_mmio_spte_created++; trace_mark_mmio_spte(rcu_dereference(iter->sptep), iter->gfn, new_spte); ret = RET_PF_EMULATE; @@ -1108,13 +1109,6 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, rcu_dereference(iter->sptep)); } - /* - * Increase pf_fixed in both RET_PF_EMULATE and RET_PF_FIXED to be - * consistent with legacy MMU behavior. - */ - if (ret != RET_PF_SPURIOUS) - vcpu->stat.pf_fixed++; - return ret; } |