From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Mon, 1 Nov 2010 09:03:44 +0000 (+0800)
Subject: KVM: fix the race while wakeup all pv guest
X-Git-Tag: v2.6.38-rc1~244^2~102
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64f638c7c44fa87e65f51eaf0f8302b9cba2d696;p=pandora-kernel.git

KVM: fix the race while wakeup all pv guest

In kvm_async_pf_wakeup_all(), we add a dummy apf to vcpu->async_pf.done
without holding vcpu->async_pf.lock, it will break if we are handling apfs
at this time.

Also use 'list_empty_careful()' instead of 'list_empty()'

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---

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