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| author | Sean Christopherson <seanjc@google.com> | 2024-09-06 06:34:09 +0200 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-09-10 05:14:59 +0200 |
| commit | 8c23670f2b0004edb8f7135e314114f0c3452085 (patch) | |
| tree | 79992a37eb7a5170c3f339279aa13a245ac555e3 /arch | |
| parent | KVM: nVMX: Get to-be-acknowledge IRQ for nested VM-Exit at injection site (diff) | |
| download | linux-8c23670f2b0004edb8f7135e314114f0c3452085.tar.xz linux-8c23670f2b0004edb8f7135e314114f0c3452085.zip | |
KVM: nVMX: Suppress external interrupt VM-Exit injection if there's no IRQ
In the should-be-impossible scenario that kvm_cpu_get_interrupt() doesn't
return a valid vector after checking kvm_cpu_has_interrupt(), skip VM-Exit
injection to reduce the probability of crashing/confusing L1. Now that
KVM gets the IRQ _before_ calling nested_vmx_vmexit(), squashing the
VM-Exit injection is trivial since there are no actions that need to be
undone.
Reviewed-by: Chao Gao <chao.gao@intel.com>
Link: https://lore.kernel.org/r/20240906043413.1049633-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx/nested.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index 1a6dc85cde18..e57cd849354b 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4305,7 +4305,8 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu) } irq = kvm_apic_has_interrupt(vcpu); - WARN_ON_ONCE(irq < 0); + if (WARN_ON_ONCE(irq < 0)) + goto no_vmexit; nested_vmx_vmexit(vcpu, EXIT_REASON_EXTERNAL_INTERRUPT, INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR | irq, 0); |