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c9d40913ac
In case an interrupt arrives after nested.check_events but before the call to kvm_cpu_has_injectable_intr, we could end up enabling the interrupt window even if the interrupt is actually going to be a vmexit. This is useless rather than harmful, but it really complicates reasoning about SVM's handling of the VINTR intercept. We'd like to never bother with the VINTR intercept if V_INTR_MASKING=1 && INTERCEPT_INTR=1, because in that case there is no interrupt window and we can just exit the nested guest whenever we want. This patch moves the opening of the interrupt window inside inject_pending_event. This consolidates the check for pending interrupt/NMI/SMI in one place, and makes KVM's usage of immediate exits more consistent, extending it beyond just nested virtualization. There are two functional changes here. They only affect corner cases, but overall they simplify the inject_pending_event. - re-injection of still-pending events will also use req_immediate_exit instead of using interrupt-window intercepts. This should have no impact on performance on Intel since it simply replaces an interrupt-window or NMI-window exit for a preemption-timer exit. On AMD, which has no equivalent of the preemption time, it may incur some overhead but an actual effect on performance should only be visible in pathological cases. - kvm_arch_interrupt_allowed and kvm_vcpu_has_events will return true if an interrupt, NMI or SMI is blocked by nested_run_pending. This makes sense because entering the VM will allow it to make progress and deliver the event. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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