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| author | Maciej S. Szmigiero <maciej.szmigiero@oracle.com> | 2022-05-02 00:07:34 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-08 04:47:03 -0400 |
| commit | 159fc6fa3b7db24db85598115cc43dc47196919e (patch) | |
| tree | 8e60a25148285542a30c23d3713dc23eb2d6e01e /arch/x86/kvm/svm/nested.c | |
| parent | 2d61391270a3ceb95b3dd536ea13002e653323b6 (diff) | |
| download | linux-159fc6fa3b7db24db85598115cc43dc47196919e.tar.bz2 | |
KVM: nSVM: Transparently handle L1 -> L2 NMI re-injection
A NMI that L1 wants to inject into its L2 should be directly re-injected,
without causing L0 side effects like engaging NMI blocking for L1.
It's also worth noting that in this case it is L1 responsibility
to track the NMI window status for its L2 guest.
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Message-Id: <f894d13501cd48157b3069a4b4c7369575ddb60e.1651440202.git.maciej.szmigiero@oracle.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 0d25dea40796..688f86b9202a 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -623,6 +623,16 @@ static inline bool is_evtinj_soft(u32 evtinj) return type == SVM_EVTINJ_TYPE_EXEPT && kvm_exception_is_soft(vector); } +static bool is_evtinj_nmi(u32 evtinj) +{ + u32 type = evtinj & SVM_EVTINJ_TYPE_MASK; + + if (!(evtinj & SVM_EVTINJ_VALID)) + return false; + + return type == SVM_EVTINJ_TYPE_NMI; +} + static void nested_vmcb02_prepare_control(struct vcpu_svm *svm, unsigned long vmcb12_rip) { @@ -691,6 +701,7 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm, else if (boot_cpu_has(X86_FEATURE_NRIPS)) vmcb02->control.next_rip = vmcb12_rip; + svm->nmi_l1_to_l2 = is_evtinj_nmi(vmcb02->control.event_inj); if (is_evtinj_soft(vmcb02->control.event_inj)) { svm->soft_int_injected = true; svm->soft_int_csbase = svm->vmcb->save.cs.base; @@ -873,6 +884,7 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu) out_exit_err: svm->nested.nested_run_pending = 0; + svm->nmi_l1_to_l2 = false; svm->soft_int_injected = false; svm->vmcb->control.exit_code = SVM_EXIT_ERR; |