KVM: VMX: optimize #PF injection when MAXPHYADDR does not match (8c4182bd) · Commits · 戴 / test

Ignore non-present page faults, since those cannot have reserved bits set. When running access.flat with "-cpu Haswell,phys-bits=36", the number of trapped page faults goes down from 8872644 to 3978948. Signed-off-by:

Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200710154811.418214-9-mgamal@redhat.com> Signed-off-by:

Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/vmx/vmx.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -4355,6 +4355,16 @@ static void init_vmcs(struct vcpu_vmx *vmx)
		vmx->pt_desc.guest.output_mask = 0x7F;
		vmcs_write64(GUEST_IA32_RTIT_CTL, 0);
		}

		/*
		* If EPT is enabled, #PF is only trapped if MAXPHYADDR is mismatched
		* between guest and host. In that case we only care about present
		* faults.
		*/
		if (enable_ept) {
		vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, PFERR_PRESENT_MASK);
		vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, PFERR_PRESENT_MASK);
		}
		}

		static void vmx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)

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