From 1196cb970b996be69a2fcd9756117b394f8e7526 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Fri, 20 Mar 2020 14:28:23 -0700 Subject: KVM: nVMX: Reload APIC access page on nested VM-Exit only if necessary Defer reloading L1's APIC page by logging the need for a reload and processing it during nested VM-Exit instead of unconditionally reloading the APIC page on nested VM-Exit. This eliminates a TLB flush on the majority of VM-Exits as the APIC page rarely needs to be reloaded. Signed-off-by: Sean Christopherson Message-Id: <20200320212833.3507-28-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx/nested.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) (limited to 'arch/x86/kvm/vmx/nested.c') diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index deddf0f0f6e7..a7a526a21292 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4346,11 +4346,10 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 exit_reason, kvm_vcpu_unmap(vcpu, &vmx->nested.pi_desc_map, true); vmx->nested.pi_desc = NULL; - /* - * We are now running in L2, mmu_notifier will force to reload the - * page's hpa for L2 vmcs. Need to reload it for L1 before entering L1. - */ - kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu); + if (vmx->nested.reload_vmcs01_apic_access_page) { + vmx->nested.reload_vmcs01_apic_access_page = false; + kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu); + } if ((exit_reason != -1) && (enable_shadow_vmcs || vmx->nested.hv_evmcs)) vmx->nested.need_vmcs12_to_shadow_sync = true; -- cgit