diff options
| author | Sean Christopherson <seanjc@google.com> | 2022-05-02 00:07:30 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-08 04:46:53 -0400 |
| commit | 7e5b5ef8dca3229a5226eabf53bdc7b67ebd07ad (patch) | |
| tree | aa0eb70b5bec459b6d33bf71e91b05db08d617d5 /arch/x86/kvm/svm/svm.c | |
| parent | 6ef88d6e36c2b4b3886ec9967cafabe4424d27d5 (diff) | |
| download | linux-7e5b5ef8dca3229a5226eabf53bdc7b67ebd07ad.tar.bz2 | |
KVM: SVM: Re-inject INTn instead of retrying the insn on "failure"
Re-inject INTn software interrupts instead of retrying the instruction if
the CPU encountered an intercepted exception while vectoring the INTn,
e.g. if KVM intercepted a #PF when utilizing shadow paging. Retrying the
instruction is architecturally wrong e.g. will result in a spurious #DB
if there's a code breakpoint on the INT3/O, and lack of re-injection also
breaks nested virtualization, e.g. if L1 injects a software interrupt and
vectoring the injected interrupt encounters an exception that is
intercepted by L0 but not L1.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Message-Id: <1654ad502f860948e4f2d57b8bd881d67301f785.1651440202.git.maciej.szmigiero@oracle.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 | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index ec37647ca068..6248967d4a77 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3438,12 +3438,22 @@ static void svm_inject_nmi(struct kvm_vcpu *vcpu) static void svm_inject_irq(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); + u32 type; + + if (vcpu->arch.interrupt.soft) { + if (svm_update_soft_interrupt_rip(vcpu)) + return; + + type = SVM_EVTINJ_TYPE_SOFT; + } else { + type = SVM_EVTINJ_TYPE_INTR; + } trace_kvm_inj_virq(vcpu->arch.interrupt.nr); ++vcpu->stat.irq_injections; svm->vmcb->control.event_inj = vcpu->arch.interrupt.nr | - SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR; + SVM_EVTINJ_VALID | type; } void svm_complete_interrupt_delivery(struct kvm_vcpu *vcpu, int delivery_mode, @@ -3723,6 +3733,8 @@ static inline void sync_lapic_to_cr8(struct kvm_vcpu *vcpu) static void svm_complete_soft_interrupt(struct kvm_vcpu *vcpu, u8 vector, int type) { + bool is_exception = (type == SVM_EXITINTINFO_TYPE_EXEPT); + bool is_soft = (type == SVM_EXITINTINFO_TYPE_SOFT); struct vcpu_svm *svm = to_svm(vcpu); /* @@ -3734,8 +3746,7 @@ static void svm_complete_soft_interrupt(struct kvm_vcpu *vcpu, u8 vector, * the same event, i.e. if the event is a soft exception/interrupt, * otherwise next_rip is unused on VMRUN. */ - if (nrips && type == SVM_EXITINTINFO_TYPE_EXEPT && - kvm_exception_is_soft(vector) && + if (nrips && (is_soft || (is_exception && kvm_exception_is_soft(vector))) && kvm_is_linear_rip(vcpu, svm->soft_int_old_rip + svm->soft_int_csbase)) svm->vmcb->control.next_rip = svm->soft_int_next_rip; /* @@ -3746,7 +3757,7 @@ static void svm_complete_soft_interrupt(struct kvm_vcpu *vcpu, u8 vector, * hit a #NP in the guest, and the #NP encountered a #PF, the #NP will * be the reported vectored event, but RIP still needs to be unwound. */ - else if (!nrips && type == SVM_EXITINTINFO_TYPE_EXEPT && + else if (!nrips && (is_soft || is_exception) && kvm_is_linear_rip(vcpu, svm->soft_int_next_rip + svm->soft_int_csbase)) kvm_rip_write(vcpu, svm->soft_int_old_rip); } @@ -3808,9 +3819,13 @@ static void svm_complete_interrupts(struct kvm_vcpu *vcpu) case SVM_EXITINTINFO_TYPE_INTR: kvm_queue_interrupt(vcpu, vector, false); break; + case SVM_EXITINTINFO_TYPE_SOFT: + kvm_queue_interrupt(vcpu, vector, true); + break; default: break; } + } static void svm_cancel_injection(struct kvm_vcpu *vcpu) |