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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2022-03-22 19:40:45 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-02 05:41:22 -0400 |
| commit | 1d5a1b5860ed6f623071329112e5935db043eb55 (patch) | |
| tree | 204da676789d8b4ec2702573b1301fdcbfa7301c /arch/x86/kvm/svm/nested.c | |
| parent | ea91559b005443ddd9ea180ffdec4b4fda21d477 (diff) | |
| download | linux-1d5a1b5860ed6f623071329112e5935db043eb55.tar.bz2 | |
KVM: x86: nSVM: correctly virtualize LBR msrs when L2 is running
When L2 is running without LBR virtualization, we should ensure
that L1's LBR msrs continue to update as usual.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220322174050.241850-2-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/nested.c')
| -rw-r--r-- | arch/x86/kvm/svm/nested.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 1c381c6a7b51..98647f5dec93 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -536,6 +536,7 @@ void nested_vmcb02_compute_g_pat(struct vcpu_svm *svm) static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12) { bool new_vmcb12 = false; + struct vmcb *vmcb01 = svm->vmcb01.ptr; struct vmcb *vmcb02 = svm->nested.vmcb02.ptr; nested_vmcb02_compute_g_pat(svm); @@ -586,6 +587,9 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12 svm->vcpu.arch.dr6 = svm->nested.save.dr6 | DR6_ACTIVE_LOW; vmcb_mark_dirty(vmcb02, VMCB_DR); } + + if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) + svm_copy_lbrs(vmcb02, vmcb01); } static void nested_vmcb02_prepare_control(struct vcpu_svm *svm) @@ -645,6 +649,9 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm) vmcb02->control.event_inj = svm->nested.ctl.event_inj; vmcb02->control.event_inj_err = svm->nested.ctl.event_inj_err; + vmcb02->control.virt_ext = vmcb01->control.virt_ext & + LBR_CTL_ENABLE_MASK; + if (!nested_vmcb_needs_vls_intercept(svm)) vmcb02->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK; @@ -912,6 +919,11 @@ int nested_svm_vmexit(struct vcpu_svm *svm) svm_switch_vmcb(svm, &svm->vmcb01); + if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) { + svm_copy_lbrs(vmcb01, vmcb02); + svm_update_lbrv(vcpu); + } + /* * On vmexit the GIF is set to false and * no event can be injected in L1. |