github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-27 00:22:00 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

KVM: nVMX: Suppress external interrupt VM-Exit injection if there's no IRQ

Browse Source 
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>
This commit is contained in:
Sean Christopherson 2024-09-05 21:34:09 -07:00
parent 363010e1dd
commit 8c23670f2b
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/kvm/vmx/nested.c
View File

@ -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);