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| author | Maxim Levitsky <mlevitsk@redhat.com> | 2022-03-22 19:40:46 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-04-02 05:41:23 -0400 |
| commit | d20c796ca3709801f8a7fa36e8770a3dd8ebd34e (patch) | |
| tree | 6515cc9fa05fa3401d7bd8d2bfc13f1aaad14a6e /arch/x86/kvm/svm/nested.c | |
| parent | 1d5a1b5860ed6f623071329112e5935db043eb55 (diff) | |
| download | linux-d20c796ca3709801f8a7fa36e8770a3dd8ebd34e.tar.bz2 | |
KVM: x86: nSVM: implement nested LBR virtualization
This was tested with kvm-unit-test that was developed
for this purpose.
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20220322174050.241850-3-mlevitsk@redhat.com>
[Copy all of DEBUGCTL except for reserved bits. - Paolo]
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 | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 98647f5dec93..f1332d802ec8 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -588,8 +588,18 @@ static void nested_vmcb02_prepare_save(struct vcpu_svm *svm, struct vmcb *vmcb12 vmcb_mark_dirty(vmcb02, VMCB_DR); } - if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) + if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) { + /* + * Reserved bits of DEBUGCTL are ignored. Be consistent with + * svm_set_msr's definition of reserved bits. + */ + svm_copy_lbrs(vmcb02, vmcb12); + vmcb02->save.dbgctl &= ~DEBUGCTL_RESERVED_BITS; + svm_update_lbrv(&svm->vcpu); + + } else 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) @@ -651,6 +661,9 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm) vmcb02->control.virt_ext = vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK; + if (svm->lbrv_enabled) + vmcb02->control.virt_ext |= + (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK); if (!nested_vmcb_needs_vls_intercept(svm)) vmcb02->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK; @@ -919,7 +932,10 @@ int nested_svm_vmexit(struct vcpu_svm *svm) svm_switch_vmcb(svm, &svm->vmcb01); - if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) { + if (unlikely(svm->lbrv_enabled && (svm->nested.ctl.virt_ext & LBR_CTL_ENABLE_MASK))) { + svm_copy_lbrs(vmcb12, vmcb02); + svm_update_lbrv(vcpu); + } else if (unlikely(vmcb01->control.virt_ext & LBR_CTL_ENABLE_MASK)) { svm_copy_lbrs(vmcb01, vmcb02); svm_update_lbrv(vcpu); } |