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Commit 0ff31867 authored by Carsten Otte's avatar Carsten Otte Committed by Avi Kivity
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KVM: s390: fix interrupt delivery 



The current code delivers pending interrupts before it checks for
need_resched. On a busy host, this can lead to a longer interrupt
latency if the interrupt is injected while the process is scheduled
away. This patch moves delivering the interrupt _after_ schedule(),
which makes more sense.

Signed-off-by: default avatarCarsten Otte <cotte@de.ibm.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 71cde587

arch/s390/kvm/kvm-s390.c

+2 −1
Original line number Diff line number Diff line
@@ -435,6 +435,8 @@ static void __vcpu_run(struct kvm_vcpu *vcpu) 
	if (test_thread_flag(TIF_MCCK_PENDING))

		s390_handle_mcck();



	kvm_s390_deliver_pending_interrupts(vcpu);



	vcpu->arch.sie_block->icptcode = 0;

	local_irq_disable();

	kvm_guest_enter();
@@ -480,7 +482,6 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 
	might_sleep();



	do {

		kvm_s390_deliver_pending_interrupts(vcpu);

		__vcpu_run(vcpu);

		rc = kvm_handle_sie_intercept(vcpu);

	} while (!signal_pending(current) && !rc);