From: Marcelo Tosatti <mtosatti@redhat.com>
Date: Fri, 11 Apr 2008 17:53:26 +0000 (-0300)
Subject: KVM: hlt emulation should take in-kernel APIC/PIT timers into account
X-Git-Tag: v2.6.26-rc1~1028^2~20
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3d80840d96127401ba6aeadd813c3a15b84e70fe;p=pandora-kernel.git

KVM: hlt emulation should take in-kernel APIC/PIT timers into account

Timers that fire between guest hlt and vcpu_block's add_wait_queue() are
ignored, possibly resulting in hangs.

Also make sure that atomic_inc and waitqueue_active tests happen in the
specified order, otherwise the following race is open:

CPU0                                        CPU1
                                            if (waitqueue_active(wq))
add_wait_queue()
if (!atomic_read(pit_timer->pending))
    schedule()
                                            atomic_inc(pit_timer->pending)

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

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