KVM: x86: add VCPU stat for KVM_REQ_EVENT processing
This statistic can be useful to estimate the cost of an IRQ injection
scenario, by comparing it with irq_injections. For example the stat
shows that sti;hlt triggers more KVM_REQ_EVENT than sti;nop.
Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
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