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

[Michael Mol]

On 04/22/2013 03:44 PM, Michael Mair-Keimberger wrote:
>
>
> On Monday 22 April 2013 15:17:20 Michael Mol wrote:
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>> On 04/22/2013 03:04 PM, Michael Mair-Keimberger wrote:
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>> > Regarding devices which devices qemu-kvm supports, just take a look at
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>> > following commands:
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>> >
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>> > Available net devices:
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>> >
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>> > qemu-system-x86_64 -net nic,model=?
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>> >
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>> > Available cpu's:
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>> >
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>> > qemu-system-x86_64 -cpu ?
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>> >
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>> > Available machines (if needed)
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>> >
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>> > qemu-system-x86_64 -machine ?
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>> >
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>> > General list of available devices:
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>> >
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>> > qemu-system-x86_64 -device ?
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>> >
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>> >
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>> >
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>> > Depending on your arch it might differ..
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>> >
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>> >
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>> >
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>> > Regarding virito devices:
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>> >
>
>> > I highly recommend using those drivers. For my gentoo guests i always
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>> > use virtio drivers for network devices (with vhost=on) and harddisks.
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>> > (on windows guests only virito-net drivers) The performance gain is
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>> > incredible. However, especially for the virtio harddisk driver, make
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>> > sure you change fstab entries, because harddisk names change from sda to
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>> > vda (or just use them from the beginning.
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>> >
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>> >
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>> >
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>> > If you going to try out desktop vm's too i also recommend qxl with
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>> > spice. It's really fast and it also supports copy/paste (however you
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>> > need an service for copy/paste on linux "app-emulation/spice-vdagent")
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>> > and window resizing. Those features also work on windows.
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>>
>
>> Good to know. Does it work over the network, or does it presume local
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>> connectivity? My primary use case is connecting to the box over
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>> wireless. My secondary use case is connecting over a WAN link. Local
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>> connectivity is out of the question for this VM server.
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>
>
> 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
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>> > vms with an custom init script. You can take a look on it here:
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>> > https://github.com/mm1ke/qemu-init/tree/devel
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>>
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>> I'm actually not having any real difficulty setting up the VMs. As I
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>> said, the matter is largely academic. It's really not difficult to set
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>> up a guest primarily with virtio drivers, of course.
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>>
>
>> The "problem" I'm trying to solve is the apparent lack of documentation
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>> mapping host kvm/qemu capabilities with guest kernel configurations
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>>
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>> > I can also provide a basic kernel .config for the latest stable kernel
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>> > on x64 and x86 if you are interrested.
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>>
>
>> Like Stefan, I'm also curious. I would probably go through and tweak a
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>> number of network-related features (add a netfilter feature here, remove
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>> 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/

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