From: "Andreas Färber" <afaerber@suse.de>
To: Chris Webb <chris@arachsys.com>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Using AHCI drives in qemu
Date: Wed, 30 Nov 2011 13:55:22 +0100 [thread overview]
Message-ID: <4ED627BA.9070606@suse.de> (raw)
In-Reply-To: <20111130122030.GW28621@redhat.com>
Am 30.11.2011 13:20, schrieb Daniel P. Berrange:
> On Wed, Nov 30, 2011 at 12:11:45PM +0000, Chris Webb wrote:
>> Possible a stupid question, but noting the new AHCI support in qemu, how do
>> I specify an AHCI drive to attach to a qemu VM?
>>
>> I can create IDE, SCSI and virtio drives with
>>
>> -drive if=ide,bus=M,unit=N,...
>> -drive if=scsi,bus=M,unit=N,...
>> -drive if=virtio,index=N,...
>>
>> but when I attempted to test AHCI, a variety of plausible things I tried
>> like
>>
>> -drive if=ahci,...
>> -drive if=ide-ahci,...
>> -drive if=ide,bus=ahci.0,...
>>
>> all failed. There's no mention of AHCI in qemu-options.hx or qemu-doc.texi,
>> nor anything in the git commit log history about using this new drive type.
>
> Using -drive with an if=XXX which is anything other than 'none' is the
> deprecated / legacy syntax. The way libvirt does AHCI is to use the more
> verbose/modern syntax:
>
> -device ahci,id=ahci0
> -drive if=none,file=/var/lib/libvirt/images/test/disk0.raw,format=raw,id=drive-sata0-0-0
> -device ide-drive,bus=ahci0.0,drive=drive-sata0-0-0,id=sata0-0-0
>
> The first -device there creates the AHCI controller. The -drive specifies
> the disk backing store that will be used. The last -device there connects
> the drive to the ACHI controller as an ide-drive.
Also note that -device ide-cd on ahci bus is known broken, and ahci is
not yet migratable (working on it).
Andreas
--
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
prev parent reply other threads:[~2011-11-30 12:56 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-30 12:11 [Qemu-devel] Using AHCI drives in qemu Chris Webb
2011-11-30 12:20 ` Daniel P. Berrange
2011-11-30 12:42 ` Chris Webb
2011-11-30 12:51 ` Daniel P. Berrange
2011-11-30 12:55 ` Andreas Färber [this message]
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