[PATCH] kvm: Fix accounting of interrupts during guest execution on s390

[Christian Borntraeger <borntraeger-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>]

Avi, Ingo, Laurent,

what do you think about the following patch?

Currently the scheduler checks for PF_VCPU to decide if this
timeslice has to be accounted as guest time. On s390 host 
interrupts are not disabled during guest execution. This causes
these interrupts to be accounted as guest time.
Solution is to check for in_interrupt to let interrupt time 
account as soft or hardirq.

Signed-off-by: Christian Borntraeger <borntraeger-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org>
---
 kernel/sched.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: kvm/kernel/sched.c
===================================================================
--- kvm.orig/kernel/sched.c
+++ kvm/kernel/sched.c
@@ -3395,7 +3395,7 @@ void account_system_time(struct task_str
 	struct rq *rq = this_rq();
 	cputime64_t tmp;
 
-	if (p->flags & PF_VCPU) {
+	if ((p->flags & PF_VCPU) && !in_interrupt()) {
 		account_guest_time(p, cputime);
 		return;
 	}

-------------------------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc.
Still grepping through log files to find problems?  Stop.
Now Search log events and configuration files using AJAX and a browser.
Download your FREE copy of Splunk now >> http://get.splunk.com/