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Instead of blindly attempting to inject an event before each guest entry, check for a possible event first in vcpu->requests. Sites that can trigger event injection are modified to set KVM_REQ_EVENT: - interrupt, nmi window opening - ppr updates - i8259 output changes - local apic irr changes - rflags updates - gif flag set - event set on exit This improves non-injecting entry performance, and sets the stage for non-atomic injection. Signed-off-by: Avi Kivity <avi@redhat.com>