Commit 6c142801 authored Jan 15, 2008 by Avi Kivity

KVM: Fix unbounded preemption latency



When preparing to enter the guest, if an interrupt comes in while
preemption is disabled but interrupts are still enabled, we miss a
preemption point.  Fix by explicitly checking whether we need to
reschedule.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Avi Kivity <avi@qumranet.com>

parent 97db56ce

arch/x86/kvm/x86.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -2535,6 +2535,13 @@ again:

		local_irq_disable();

		if (need_resched()) {
		local_irq_enable();
		preempt_enable();
		r = 1;
		goto out;
		}

		if (signal_pending(current)) {
		local_irq_enable();
		preempt_enable();