Re: libvirt backport to Bookworm

Hi Thomas,

On Wed, Jun 19, 2024 at 05:48:33PM +0200, Thomas Goirand wrote:
> Hi there!
> 
> We're about to put in production a 2nd region of our public cloud, which is
> OpenStack based, and using libvirt / kvm.
> 
> The hardware we have is rather recent: each compute is equiped with 2x EPYC
> 112 core CPU. That is the EPYC-Genoa CPU model in Qemu.
> 
> Therefore, we've installed the latest qemu from bookworm-backports. However,
> libvirt is still too old, and doesn't know about this CPU. Therefore, nova
> thinks it's model is EPYC-Milan, and not EPYC-Genoa.

Did you check if updating the cpu map in /usr/share/libvirt/cpu_map/ is sufficient?

> I've done a backport myself of python-libvirt and libvirt, and it's painless
> to do: just a simple rebuild without changing the package.

Glad that worked so well.

> 
> Therefore, I'd like to ask: does the libvirt team (guido?) would like to
> upload a backported version of libvirt and python-libvirt to Bookworm? If
> yes, that'd be great. If no, would you mind if I do the upload? Will you
> help maintaining it?

I wouldn't have much bandwidth to help here. Let's see if Andrea has any
objections as he's doing most of the work in sid/trixie atm.

Cheers,
 -- Guido

> 
> Note that it's working perfectly well for me: I was able to spawn VMs, and
> live-migrate them between compute hosts running the latest OpenStack Caracal
> version.
> 
> Cheers,
> 
> Thomas Goirand (zigo)
>