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    Subject[PATCH v4 16/24] KVM: x86: Evaluate ability to inject SMI/NMI/IRQ after potential VM-Exit
    From
    Determine whether or not new events can be injected after checking nested
    events. If a VM-Exit occurred during nested event handling, any previous
    event that needed re-injection is gone from's KVM perspective; the event
    is captured in the vmc*12 VM-Exit information, but doesn't exist in terms
    of what needs to be done for entry to L1.

    Signed-off-by: Sean Christopherson <seanjc@google.com>
    Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
    ---
    arch/x86/kvm/x86.c | 10 ++++++++--
    1 file changed, 8 insertions(+), 2 deletions(-)

    diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    index 046c8c2fbd8f..fb9edbb6ee1a 100644
    --- a/arch/x86/kvm/x86.c
    +++ b/arch/x86/kvm/x86.c
    @@ -9670,7 +9670,7 @@ static void kvm_inject_exception(struct kvm_vcpu *vcpu)

    static int inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit)
    {
    - bool can_inject = !kvm_event_needs_reinjection(vcpu);
    + bool can_inject;
    int r;

    /*
    @@ -9735,7 +9735,13 @@ static int inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit)
    if (r < 0)
    goto out;

    - /* try to inject new event if pending */
    + /*
    + * New events, other than exceptions, cannot be injected if KVM needs
    + * to re-inject a previous event. See above comments on re-injecting
    + * for why pending exceptions get priority.
    + */
    + can_inject = !kvm_event_needs_reinjection(vcpu);
    +
    if (vcpu->arch.exception.pending) {
    /*
    * Fault-class exceptions, except #DBs, set RF=1 in the RFLAGS
    --
    2.37.1.359.gd136c6c3e2-goog
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