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Re: [Qemu-devel] [PATCH] boot: fix path pattern of scsi device

From: Amos Kong
Subject: Re: [Qemu-devel] [PATCH] boot: fix path pattern of scsi device
Date: Tue, 28 May 2013 18:31:37 +0800
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, May 28, 2013 at 12:26:34PM +0200, Laszlo Ersek wrote:
> On 05/28/13 10:06, Paolo Bonzini wrote:
> > Il 28/05/2013 09:40, Amos Kong ha scritto:
> >> bootindex parameter of scsi device doesn't work, it causes
> >> by wrong pattern in seabios.
> >>
> >> qemu passes the following firmware dev_path to seabios:
> >>  
> >> /address@hidden/address@hidden/virtio-scsi-device/address@hidden/address@hidden,0
> > 
> > No, this is another unexpected change due to the virtio refactoring in
> > QEMU.  The right fix is in QEMU, by adding a get_fw_dev_path
> > implementation in hw/virtio/virtio-bus.c.
> > 
> > We fixed it already for migration paths, it should be easy to do the
> > same for this.
> > 
> > Please Cc address@hidden when sending the QEMU patch.
> > 
> > Thanks,
> > 
> > Paolo
> Ahhh. I was super confused by this patch initially.
> Amos, when posting a patch to both lists, please add the project name to
> the bracketed bag-of-tags in the subject, like
> [SeaBIOS PATCH] boot: fix path pattern of scsi device

Sorry for the mistiness.
> I saw this message first on qemu-devel, and until I noticed "src/boot.c"
> I was kind of confused whom you want to adapt to whom, and in what
> direction Paolo argues against it.
> So, virtio refactoring in QEMU (care to name a commit or release?)
> changed the OpenFirmware device path exported for virtio-scsi devices
> under the boot order fw_cfg key. This patch intended to adapt SeaBIOS to
> recognize the new OFW devpath. Under this approach I would have to
> update QemuBootOrder.c in OVMF in parallel, so that it accepts both old
> and new style OFW devpaths for virtio-scsi.
> However Paolo says the new style OFW devpath should be fixed
> (eliminated) in qemu, and consumers shouldn't notice any change in the
> long term. And I won't have to change QemuBootOrder.c. Right?

Just sent a qemu patch to fix this problem. We will keep original
style devpath.

> Thanks!
> Laszlo


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