Re: [gentoo-user] kvm/libvirt and kernel configuration

[Michael Mair-Keimberger]

On Monday 22 April 2013 16:19:11 Michael Mol wrote:
> On 04/22/2013 03:44 PM, Michael Mair-Keimberger wrote:
> > On Monday 22 April 2013 15:17:20 Michael Mol wrote:
> >> On 04/22/2013 03:04 PM, Michael Mair-Keimberger wrote:
> >> > Regarding devices which devices qemu-kvm supports, just take a look at
> >> >
> >> > following commands:
> >> >
> >> >
> >> >
> >> > Available net devices:
> >> >
> >> >
> >> >
> >> > qemu-system-x86_64 -net nic,model=?
> >> >
> >> >
> >> >
> >> > Available cpu's:
> >> >
> >> >
> >> >
> >> > qemu-system-x86_64 -cpu ?
> >> >
> >> >
> >> >
> >> > Available machines (if needed)
> >> >
> >> >
> >> >
> >> > qemu-system-x86_64 -machine ?
> >> >
> >> >
> >> >
> >> > General list of available devices:
> >> >
> >> >
> >> >
> >> > qemu-system-x86_64 -device ?
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > Depending on your arch it might differ..
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > Regarding virito devices:
> >> >
> >> >
> >> >
> >> > I highly recommend using those drivers. For my gentoo guests i always
> >> >
> >> > use virtio drivers for network devices (with vhost=on) and harddisks.
> >> >
> >> > (on windows guests only virito-net drivers) The performance gain is
> >> >
> >> > incredible. However, especially for the virtio harddisk driver, make
> >> >
> >> > sure you change fstab entries, because harddisk names change from sda
> >> > to
> >> >
> >> > vda (or just use them from the beginning.
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> > If you going to try out desktop vm's too i also recommend qxl with
> >> >
> >> > spice. It's really fast and it also supports copy/paste (however you
> >> >
> >> > need an service for copy/paste on linux "app-emulation/spice-vdagent")
> >> >
> >> > and window resizing. Those features also work on windows.
> >>
> >> Good to know. Does it work over the network, or does it presume local
> >>
> >> connectivity? My primary use case is connecting to the box over
> >>
> >> wireless. My secondary use case is connecting over a WAN link. Local
> >>
> >> connectivity is out of the question for this VM server.
> >
> > It works over the network. I have all my vms on a server and i only
> > access those vm's over network. As client i suggest net-misc/spice-gtk.
> >
> >> > Regarding libvirt my experience is actually very low since i setup my
> >> >
> >> > vms with an custom init script. You can take a look on it here:
> >> >
> >> > https://github.com/mm1ke/qemu-init/tree/devel
> >>
> >> I'm actually not having any real difficulty setting up the VMs. As I
> >>
> >> said, the matter is largely academic. It's really not difficult to set
> >>
> >> up a guest primarily with virtio drivers, of course.
> >>
> >>
> >>
> >> The "problem" I'm trying to solve is the apparent lack of documentation
> >>
> >> mapping host kvm/qemu capabilities with guest kernel configurations
> >>
> >> > I can also provide a basic kernel .config for the latest stable kernel
> >> >
> >> > on x64 and x86 if you are interrested.
> >>
> >> Like Stefan, I'm also curious. I would probably go through and tweak a
> >>
> >> number of network-related features (add a netfilter feature here, remove
> >>
> >> a network stack component there), but it'd be interesting to look at.
> >
> > Below are both configs (kernel 3.7.10)(hope bpaste is ok).
> >
> > If you going to use them and don't use virtio-net make sure you enable
> > appropriate net drivers (e1000,rtl8129,..), because i've disabled all of
> > them.
> >
> >
> >
> > http://bpaste.net/show/93300/
> >
> > http://bpaste.net/show/93301/
>
> Attachments are ideal; the mailing list supports them, and it's more
> beneficial for the ml archives. (Even if gentoo infra's ml archives have
> been down for a year, gmane et al are also archiving.)

Well, in this case here are the config's again as an attachment. :)