Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=6c14280125a374d4c279a68276f97245e03e3f68
Commit: 6c14280125a374d4c279a68276f97245e03e3f68
Parent: 97db56ce6cc2a0766b536cc227a1da20acc5d82f
Author: Avi Kivity <[EMAIL PROTECTED]>
AuthorDate: Tue Jan 15 18:27:32 2008 +0200
Committer: Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 18:01:22 2008 +0200
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 <[EMAIL PROTECTED]>
Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
arch/x86/kvm/x86.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 77d57ff..f0493e7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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();
-
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