kvm: x86: set KVM_REQ_EVENT when updating IRR

kvm: x86: set KVM_REQ_EVENT when updating IRR

Orabug: 22623845

commit c77f3fab441c3e466b4c3601a475fc31ce156b06 upstream.

After moving PIR to IRR, the interrupt needs to be delivered manually.

Reported-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit d5f45ba87a1d13f68a480a75e1ef3b4c801d2283)
Signed-off-by: Dan Duval <dan.duval@oracle.com>