diff options
| author | Sean Christopherson <seanjc@google.com> | 2021-04-06 19:18:09 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-20 10:18:49 +0200 |
| commit | d1788191fdb03691059ab7aeed36206977f2d784 (patch) | |
| tree | 197947d4c29777031b5d7a4e8429cabe7eb99ffa /arch/x86/kvm/svm/svm.c | |
| parent | KVM: SVM: Don't set current_vmcb->cpu when switching vmcb (diff) | |
| download | linux-d1788191fdb03691059ab7aeed36206977f2d784.tar.xz linux-d1788191fdb03691059ab7aeed36206977f2d784.zip | |
KVM: SVM: Drop vcpu_svm.vmcb_pa
Remove vmcb_pa from vcpu_svm and simply read current_vmcb->pa directly in
the one path where it is consumed. Unlike svm->vmcb, use of the current
vmcb's address is very limited, as evidenced by the fact that its use
can be trimmed to a single dereference.
Opportunistically add a comment about using vmcb01 for VMLOAD/VMSAVE, at
first glance using vmcb01 instead of vmcb_pa looks wrong.
No functional change intended.
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210406171811.4043363-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 04ef49d3862d..1207526cf8e7 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -1310,7 +1310,6 @@ void svm_switch_vmcb(struct vcpu_svm *svm, struct kvm_vmcb_info *target_vmcb) { svm->current_vmcb = target_vmcb; svm->vmcb = target_vmcb->ptr; - svm->vmcb_pa = target_vmcb->pa; } static int svm_create_vcpu(struct kvm_vcpu *vcpu) @@ -3704,6 +3703,7 @@ static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu) static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); + unsigned long vmcb_pa = svm->current_vmcb->pa; /* * VMENTER enables interrupts (host state), but the kernel state is @@ -3726,12 +3726,18 @@ static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu) lockdep_hardirqs_on(CALLER_ADDR0); if (sev_es_guest(vcpu->kvm)) { - __svm_sev_es_vcpu_run(svm->vmcb_pa); + __svm_sev_es_vcpu_run(vmcb_pa); } else { struct svm_cpu_data *sd = per_cpu(svm_data, vcpu->cpu); + /* + * Use a single vmcb (vmcb01 because it's always valid) for + * context switching guest state via VMLOAD/VMSAVE, that way + * the state doesn't need to be copied between vmcb01 and + * vmcb02 when switching vmcbs for nested virtualization. + */ vmload(svm->vmcb01.pa); - __svm_vcpu_run(svm->vmcb_pa, (unsigned long *)&vcpu->arch.regs); + __svm_vcpu_run(vmcb_pa, (unsigned long *)&vcpu->arch.regs); vmsave(svm->vmcb01.pa); vmload(__sme_page_pa(sd->save_area)); |