Re: [PATCH 2/2] kvm tools: Add virtio-9p

[Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>]

On 05/26/2011 07:36 AM, Sasha Levin wrote:
> On Thu, 2011-05-26 at 07:28 -0700, Venkateswararao Jujjuri wrote:
>> Any progress on this?  May I get more detailed instructions on how
>> you did this trick? Basically booting on 9P/VirtIO.
>>
>> Thanks,
>> JV
>>
> Ofcourse. This change didn't go into tools/kvm/ since we only support
> the legacy 9p2000 protocol at the moment, which means that even though
> we can boot - it's quite unusable to work with.
>
> The trick is pretty simple: You need to name your virtio transport
> "/dev/root" (I think it's currently named "local" in qemu). Once it's
> named this way, boot with the following kernel cmdline added:
> "root=/dev/root rootflags=rw,trans=virtio,version=9p2000 rootfstype=9p
> rw" (You should be able to change version to one of the 9p2000
> extensions).
Ah I guess you are making use of rootfstype.
So in this setup basically the virtio transport you create
is /dev/root instead of "kvm_9p" correct?
Also your dir will be / ?

i.e Start KVM with '--virtio-9p /'. ?
> I've noticed that the transport *has* to be named "/dev/root", naming it
> something else (and adjusting the "root=" parameter) doesn't seem to
> work.
>
> Also, if it's named "/dev/root" I couldn't mount it as a simple
> filesystem from within a guest - not as root.
>