Re: [Qemu-devel] Booting from VirtIO disk

[Stefan Hajnoczi <stefanha@gmail.com>]

2010/12/8 अनुज <anuj01@gmail.com>:
> Hi
>
> thanks for your quick response. Please see the comments inline.
>
> 2010/12/8 Stefan Hajnoczi <stefanha@gmail.com>:
>> 2010/12/8 अनुज <anuj01@gmail.com>:
>>> Hi list
>>>
>>> I got confused after observing that there is no support for VirtIO
>>> block devices in Seabios supplied with Qemu-0.12.3. But still it can
>>> accept a VirtIO disk as a bootable device and perfectly boots from it.
>>> Then How it's done?
>>>
>>> But I can see the VirtIO block device code in Seabios source supplied
>>> with Qemu-0.13.0.
>>
>> Before SeaBIOS had native support for virtio-blk there was the extboot
>> option ROM which could boot from virtio-blk devices by reading a
>> special I/O port (it does not speak virtio-blk, see qemu-kvm.git
>> hw/extboot.c).
>
> I couldn't find this file in qemu versions 0.12.3 and 0.13.0. And my
> same doubt is also for SCSI disks.

Please keep qemu-devel@nongnu.org CCed so others can follow the
conversation and help too.

You probably looked at QEMU source code (from qemu.git).  The extboot
code is in qemu-kvm.git (which is shipped as the "kvm" or "qemu-kvm"
package on distros).  Are you sure you tested virtio-blk boot in
qemu.git-based code?

Stefan