[libvirt] [PATCH v2 2/2] Allow PCI virtio on ARM "virt" machine

Cole Robinson crobinso at redhat.com
Wed Jul 1 23:32:20 UTC 2015

On 06/30/2015 02:47 AM, Pavel Fedin wrote:
>  Hello!
>> Unfortunately thinking about this some more, the current patch approach might
>> not be acceptable as is, since current distros as a guest don't support -M
>> virt with PCI... for example Fedora 21 or 22.
>  How can this be?
>  If qemu version is new enough, virt machine should have a PCI controller. You do not have to supply
> any extra options, it's just there. It's in mainstream. Or do your distros artificially raise
> version number?
>  Or are you talking about distros themselves? But... Again, how? Do you have "Generic PCI
> controller" and virtio-PCI drivers disabled in .config of your kernel? Why? Shouldn't this be fixed
> then?
>  virtio-PCI has much better performance than virtio-mmio, because you can use vhost-net with irqfds
> on it.

I'm talking about the distro kernel as a guest. My understanding is that
Fedora 21/22 AArch64 does _not_ work with virtio-pci, but it does work with
virtio-mmio. But I've yet to confirm yet...

- Cole

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