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KVM: nVMX: promptly process interrupts delivered while in guest mode

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commit 3a25dfa67fe40f3a2690af2c562e0947a78bd6a0 upstream.

Since commit c300ab9f08 ("KVM: x86: Replace late check_nested_events() hack with
more precise fix") there is no longer the certainty that check_nested_events()
tries to inject an external interrupt vmexit to L1 on every call to vcpu_enter_guest.
Therefore, even in that case we need to set KVM_REQ_EVENT.  This ensures
that inject_pending_event() is called, and from there kvm_check_nested_events().

Fixes: c300ab9f08 ("KVM: x86: Replace late check_nested_events() hack with more precise fix")
Cc: stable@vger.kernel.org
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paolo Bonzini 2021-10-20 06:22:59 -04:00 committed by Greg Kroah-Hartman
parent b41fd8f5d2
commit 8f042315fc
1 changed files with 6 additions and 11 deletions
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17
arch/x86/kvm/vmx/vmx.c
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@ -6316,18 +6316,13 @@ static int vmx_sync_pir_to_irr(struct kvm_vcpu *vcpu)
/*
* If we are running L2 and L1 has a new pending interrupt
* which can be injected, we should re-evaluate
* what should be done with this new L1 interrupt.
* If L1 intercepts external-interrupts, we should
* exit from L2 to L1. Otherwise, interrupt should be
* delivered directly to L2.
* which can be injected, this may cause a vmexit or it may
* be injected into L2. Either way, this interrupt will be
* processed via KVM_REQ_EVENT, not RVI, because we do not use
* virtual interrupt delivery to inject L1 interrupts into L2.
*/
if (is_guest_mode(vcpu) && max_irr_updated) {
if (nested_exit_on_intr(vcpu))
kvm_vcpu_exiting_guest_mode(vcpu);
else
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
if (is_guest_mode(vcpu) && max_irr_updated)
kvm_make_request(KVM_REQ_EVENT, vcpu);
} else {
max_irr = kvm_lapic_find_highest_irr(vcpu);
}