Booting from Virtio block device

Booting from Virtio block device

[Haydn Solomon]

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First of all, thank you for all the great work on this project.

I am trying to boot a linux guest from virtio block device. I followed the
howto on the wiki but guest is not able to locate root device. Only thing I
am doing differently from the wiki is using the virtio_* modules rather than
recompiling kernel. My test environment is as follows

guest: Fedora 9 with latest 2.6.25 kernel

KVM ver 62

Host: (Fedora 8) Linux localhost.localdomain 2.6.23.15-137.fc8 #1 SMP Sun
Feb 10 17:03:13 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

Any guidance will be appreciated. Thanks.

Haydn

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Re: Booting from Virtio block device

[Tomas Rusnak]

Hello

You must add root=/dev/vdaX, where X is number of your boot partition, 
to kernel boot parameters. In lilo.conf you must add this to append line.

Have a nice day

Haydn Solomon napsal(a):
> First of all, thank you for all the great work on this project.
> 
> I am trying to boot a linux guest from virtio block device. I followed 
> the howto on the wiki but guest is not able to locate root device. Only 
> thing I am doing differently from the wiki is using the virtio_* modules 
> rather than recompiling kernel. My test environment is as follows
> 
> guest: Fedora 9 with latest 2.6.25 kernel
> 
> KVM ver 62
> 
> Host: (Fedora 8) Linux localhost.localdomain 2.6.23.15-137.fc8 #1 SMP 
> Sun Feb 10 17:03:13 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
> 
> Any guidance will be appreciated. Thanks.
> 
> Haydn
> 
> 
> ------------------------------------------------------------------------
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
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> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> kvm-devel mailing list
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-- 
Tomas Rusnak, Korex Networks
____________________________

Korex s.r.o.
Pernikarska 8
010 01 Zilina
Slovak Republic
tel	+421 41 562 5648
email	tomas.rusnak@korex.sk
web	www.korex.sk


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Re: Booting from Virtio block device

[Dor Laor]

On Thu, 2008-02-28 at 00:22 -0500, Haydn Solomon wrote:
> First of all, thank you for all the great work on this project. 
> 
> I am trying to boot a linux guest from virtio block device. I followed
> the howto on the wiki but guest is not able to locate root device.
> Only thing I am doing differently from the wiki is using the virtio_*
> modules rather than recompiling kernel. My test environment is as
> follows
> 

I haven't test it but just to make sure, do you load virtio modules in
initrd? If their not part of the kernel you must do it before mounting
the root device.

> guest: Fedora 9 with latest 2.6.25 kernel
> 
> KVM ver 62
> 
> Host: (Fedora 8) Linux localhost.localdomain 2.6.23.15-137.fc8 #1 SMP
> Sun Feb 10 17:03:13 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
> 
> Any guidance will be appreciated. Thanks.
> 
> Haydn
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Microsoft
> Defy all challenges. Microsoft(R) Visual Studio 2008.
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> _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel


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Re: Booting from Virtio block device

[Haydn Solomon]

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I  didn't create the initrd with the modules preloaded. Still not working
yet but I'm wondering... will this work with LVM volumes?

On Thu, Feb 28, 2008 at 3:05 AM, Dor Laor <dor.laor@gmail.com> wrote:

>
> On Thu, 2008-02-28 at 00:22 -0500, Haydn Solomon wrote:
> > First of all, thank you for all the great work on this project.
> >
> > I am trying to boot a linux guest from virtio block device. I followed
> > the howto on the wiki but guest is not able to locate root device.
> > Only thing I am doing differently from the wiki is using the virtio_*
> > modules rather than recompiling kernel. My test environment is as
> > follows
> >
>
> I haven't test it but just to make sure, do you load virtio modules in
> initrd? If their not part of the kernel you must do it before mounting
> the root device.
>
> > guest: Fedora 9 with latest 2.6.25 kernel
> >
> > KVM ver 62
> >
> > Host: (Fedora 8) Linux localhost.localdomain 2.6.23.15-137.fc8 #1 SMP
> > Sun Feb 10 17:03:13 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
> >
> > Any guidance will be appreciated. Thanks.
> >
> > Haydn
> >
> -------------------------------------------------------------------------
> > This SF.net email is sponsored by: Microsoft
> > Defy all challenges. Microsoft(R) Visual Studio 2008.
> > http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
> > _______________________________________________ kvm-devel mailing list
> kvm-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/kvm-devel
>
>

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Re: Booting from Virtio block device

[Avi Kivity]

Haydn Solomon wrote:
> I  didn't create the initrd with the modules preloaded. Still not 
> working yet but I'm wondering... will this work with LVM volumes?
>

It's actually easier since you don't have to change your root= line.

-- 
error compiling committee.c: too many arguments to function


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Re: Booting from Virtio block device

[Haydn Solomon]

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Ok, got it to work. Like the docs said, I needed to be careful with ramdisk;
I didn't install enough modules in the ramdisk first time around. The
Fedora9 vm is booting up much faster on virtio but haven't done any official
timings.  Network seems to be performing faster too when downloading big
files but again, no official timings. Question: As far as balloon driver,
does it give any advantage at the moment? Thanks

Haydn

On Thu, Feb 28, 2008 at 8:08 AM, Avi Kivity <avi@qumranet.com> wrote:

> Haydn Solomon wrote:
> > I  didn't create the initrd with the modules preloaded. Still not
> > working yet but I'm wondering... will this work with LVM volumes?
> >
>
> It's actually easier since you don't have to change your root= line.
>
> --
> error compiling committee.c: too many arguments to function
>
>

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