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Re: [Qemu-devel] [PATCH] [virtio] Add virtio block device sanboot suppor

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH] [virtio] Add virtio block device sanboot support
Date: Wed, 06 Jan 2010 10:27:52 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20090922 Fedora/3.0-3.9.b4.fc12 Lightning/1.0pre Thunderbird/3.0b4

On 01/05/10 21:46, Stefan Hajnoczi wrote:
This patch adds virtio block device support alongside the existing iSCSI,
ATA-over-Ethernet, and ramdisk block devices.  The virtio block device provides
storage in virtualized environments.

Using this patch, a gPXE option ROM can boot a QEMU/KVM virtual machine
directly from a virtio block device.


Here is an example QEMU invocation:
qemu -drive if=virtio,file=debian.qcow2 -option-rom gpxe/src/bin/1af41001.rom

Perhaps the first available device should be chosen if virtio_blk: is given
without PCI bus, device, and function.  I am open to suggestions on how virtio
block device option ROMs should work.

Clear answer: as PCI ROM.

Try this (requires qemu 0.12):

qemu -drive if=none,id=boot,file=debian.qcow2 \
     -device virtio-blk-pci,drive=boot,romfile=gpxe/src/bin/1af41001.rom

You should end up with a virtio-blk device with a pci rom bar holding the option rom. seabios should load and run the rom. The disk should appear in the boot menu (enabled by '-boot menu=on').


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