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[Xen-devel] [PATCH] [HVM] fix a HVM save/restore race condition after r1

from [Zhai, Edwin]

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To:	Tim <Tim.Deegan@xxxxxxxxxxxxx>
Subject:	[Xen-devel] [PATCH] [HVM] fix a HVM save/restore race condition after r15639
From:	"Zhai, Edwin" <edwin.zhai@xxxxxxxxx>
Date:	Mon, 13 Aug 2007 22:55:59 +0800
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx, "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>
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Tim,

The qemu save command sending is moved from saveInputHandler to 
refreshShutdown(too late) in r15639, so higher possibility that control panel 
read a not ready qemu state file especially for live migration.

If reading happened before qemu create this file, a python missing file 
exception would occur. If before qemu put the record length in the file header 
as the last step, dest machine would try to restore a zero length qemu file to 
lead state lost in each device.

Attached patch can fix it, pls. have a look.

Thanks,


-- 
best rgds,
edwin

hvm_live_migration_fix_r15716.patch
Description: Text document

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