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Re: [Qemu-devel] [PATCH v2 27/45] scsi-disk: Preserve tray state on migr

From: Kevin Wolf
Subject: Re: [Qemu-devel] [PATCH v2 27/45] scsi-disk: Preserve tray state on migration
Date: Fri, 02 Sep 2011 18:18:58 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:6.0) Gecko/20110816 Thunderbird/6.0

Am 02.09.2011 17:35, schrieb Markus Armbruster:
> Kevin Wolf <address@hidden> writes:
>> Am 03.08.2011 15:08, schrieb Markus Armbruster:
>>> Breaks migration of qdevs "scsi-cd" and legacy "scsi-disk" to older
>>> versions.  We normally use subsections to avoid that.  Not possible
>>> here, because we don't have a section to begin with.  Too bad.
>>> Signed-off-by: Markus Armbruster <address@hidden>
>> A more logical approach would be to add migration support to SCSI first.
> Isn't that what I do?
>> I guess adding .unmigratable = 1 makes more sense at the moment.
> Why?

Hm, you mean that we can successfully migrate SCSI today?

SCSIDiskState doesn't seem to directly have anything variable that must
be migrated. I think SCSIDevice does have fields that need to be
migrated (unit_attention, sense and the request list). I'm not sure what
other state scsi-bus involves, but unless the SCSI controllers can
restore all of it, it should have a VMState, too.


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