From: Olaf Hering <olaf@aepfle.de>
To: George Dunlap <george.dunlap@citrix.com>
Cc: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: 4.7 qemu regression: HVM guests fail to boot from xvda
Date: Tue, 31 May 2016 13:41:41 +0200 [thread overview]
Message-ID: <20160531114141.GA17626@aepfle.de> (raw)
In-Reply-To: <CAFLBxZZdV=aRP-X=3gJX-DdQAHC1tsqPdrnDtCY6rsr4Tht9PA@mail.gmail.com>
On Tue, May 31, George Dunlap wrote:
> Sorry, can you expand on this a bit? Are you saying that on SuSE, if
> you specify "vdev=xvda" in your config file, that you'll get PV
> devices named "/dev/xvda", but that if you specify "vdev=hda", that
> you'll get PV devices but named "/dev/hda"?
Yes, thats exactly what the xenlinux block frontend does.
pvops forces xvda, independent of the name 'vdev' in domU.cfg.
Up to xen-4.2 'vdev=hd*' was required to tell qemu to create an emulated
disk to boot from. Starting with xen-4.3 qemu also recognized
'vdev=xvd*' for the emulated disk. And starting with xen-4.7 qemu
requires 'xvda=hd*' again.
I think if some domU.cfg for xen-4.3+ has 'vdev=xvd*' and the domU uses
for some reason kernel names in config files and the domU uses a
xenlinux kernel, then changing domU.cfg to 'hd*' will allow the guest to
boot again. But its userland will miss the /dev/xvd* device nodes.
That probably remained unnoticed during testing the referenced commit if
a pvops based kernel was used.
Olaf
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next prev parent reply other threads:[~2016-05-31 11:41 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-30 20:42 4.7 qemu regression: HVM guests fail to boot from xvda Olaf Hering
2016-05-31 11:02 ` George Dunlap
2016-05-31 11:16 ` Olaf Hering
2016-05-31 11:32 ` George Dunlap
2016-05-31 11:41 ` Olaf Hering [this message]
2016-05-31 12:00 ` George Dunlap
2016-05-31 12:04 ` Olaf Hering
2016-06-01 13:17 ` Olaf Hering
2016-06-01 21:40 ` Olaf Hering
2016-06-02 11:49 ` Wei Liu
2016-06-02 12:06 ` Olaf Hering
2016-05-31 12:15 ` Jan Beulich
2016-06-01 9:48 ` Wei Liu
2016-06-01 13:34 ` Olaf Hering
2016-06-01 14:11 ` Wei Liu
2016-06-01 14:32 ` Olaf Hering
2016-06-01 15:36 ` Ian Jackson
2016-06-03 10:13 ` George Dunlap
2016-06-03 11:20 ` Olaf Hering
2016-06-03 11:27 ` George Dunlap
2016-06-03 11:45 ` Ian Jackson
2016-06-06 10:39 ` George Dunlap
2016-06-06 10:52 ` Ian Jackson
2016-06-06 11:43 ` George Dunlap
2016-06-06 12:49 ` George Dunlap
2016-06-07 14:08 ` George Dunlap
2016-06-07 14:27 ` Olaf Hering
2016-06-08 10:17 ` Ian Jackson
2016-06-07 19:06 ` Olaf Hering
2016-06-08 10:18 ` Ian Jackson
2016-06-08 10:23 ` George Dunlap
2016-06-08 10:30 ` Ian Jackson
2016-06-08 10:49 ` George Dunlap
2016-06-08 11:13 ` Olaf Hering
2016-06-08 15:56 ` Konrad Rzeszutek Wilk
2016-06-03 11:50 ` Olaf Hering
2016-05-31 12:10 ` Jan Beulich
2016-05-31 13:41 ` George Dunlap
2016-05-31 14:10 ` Jan Beulich
2016-05-31 16:15 ` Konrad Rzeszutek Wilk
2016-06-08 11:38 ` Wei Liu
2016-06-08 12:04 ` Olaf Hering
2016-06-08 12:09 ` Wei Liu
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