From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Wed, 11 Jun 2008 22:52:53 +0000 (-0300)
Subject: KVM: only abort guest entry if timer count goes from 0->1
X-Git-Tag: v2.6.27-rc1~968^2~32
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=622395a9e63bf87a16faecf555ed02375cbae5b7;p=pandora-kernel.git

KVM: only abort guest entry if timer count goes from 0->1

Only abort guest entry if the timer count went from 0->1, since for 1->2
or larger the bit will either be set already or a timer irq will have
been injected.

Using atomic_inc_and_test() for it also introduces an SMP barrier
to the LAPIC version (thought it was unecessary because of timer
migration, but guest can be scheduled to a different pCPU between exit
and kvm_vcpu_block(), so there is the possibility for a race).

Noticed by Avi.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---

Reading git-diff-tree failed