[PATCH] Don't quit IO thread before all lvcpus stopped

[Dor Laor <dor.laor@qumranet.com>]

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while investigating the revert of "fix sci irq set when acpi timer" I
discovered the reason. Please also re-revert the original patch.
Thanks,
Dor

-------------
[PATCH] Don't quit IO thread before all lvcpus stopped

Call pause_all_threads() before exiting the i/o thread
main loop.
This scenario happened on system_powerdown request:
The vcpu eventually makes pm_ioport_writew (soft power off)
access that calls qemu_system_shutdown_request.
It causes the i/o thread to exit although the vcpu did not
exit yet.

One of the symptoms is that vcpu may trigger timers thus
causing a segfault since the i/o thread stopped the timer.
[This is what happened on the sci irq timer, now there is no
need to revert it[

Signed-off-by: Dor Laor <dor.laor@qumranet.com>
---
 qemu/qemu-kvm.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/qemu/qemu-kvm.c b/qemu/qemu-kvm.c
index 50589a7..78127de 100644
--- a/qemu/qemu-kvm.c
+++ b/qemu/qemu-kvm.c
@@ -452,7 +452,9 @@ int kvm_main_loop(void)
         pthread_mutex_unlock(&qemu_mutex);
     }
 
+    pause_all_threads();
     pthread_mutex_unlock(&qemu_mutex);
+
     return 0;
 }
 
-- 
1.5.4.1


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