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KVM: Fix unbounded preemption latency

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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>
This commit is contained in:
Avi Kivity 2008-01-15 18:27:32 +02:00
parent 97db56ce6c
commit 6c14280125
1 changed files with 7 additions and 0 deletions
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7
arch/x86/kvm/x86.c
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@ -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();