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Re: [Qemu-devel] virtio block device and sysfs


From: Marc Haber
Subject: Re: [Qemu-devel] virtio block device and sysfs
Date: Mon, 13 Sep 2010 10:55:48 +0200
User-agent: Mutt/1.5.18 (2008-05-17)

Hi John and Ryan,

On Tue, Jun 29, 2010 at 01:33:33PM -0500, Ryan Harper wrote:
> We've got a sysfs 'serial' attribute for virtio-blk devices upstream[1].
> I've got udev support for using this attribute to create disk/by-id (and
> a fix for by-path) symlinks[2].  All that remains is to
> re-spin/post the qemu virtio-blk serial patches[3] and get that in and
> we'll have the full stack working as I've already tested libvirt (which
> has disk serial support).

How is this going to work once the patches have been applied? Even
qemu 0.11's -drive definition allows a serial= option, but currently
(qemu-kvm 0.12.5, and 2.6.35.4 in the guest) the string passed to it
isn't seen anywhere in the guest's /sys/block/vda.

My test call was
kvm -cdrom ~/bigstuff/grml64-small_sid_20100913.iso \
    -drive file=test.qcow2,if=virtio,media=disk,serial=foo

Greetings
Marc

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