[libvirt] Question about virtio-pci in Aarch64

[Guido Günther]

On Fri, Aug 19, 2016 at 11:52:55AM +0200, Andrea Bolognani wrote:
> On Fri, 2016-08-19 at 10:27 +0200, Guido Günther wrote:
> > > I think kernel 3.16.0 is simply too old.
> > 
> > According to the changelog it has been enabled in 3.14.7-1 on all architectures:
> > 
> >     http://metadata.ftp-master.debian.org/changelogs//main/l/linux/stable_changelog
> 
> Are you referring to the
> 
>   * [armhf] Enable VIRTIO_BALLOON and VIRTIO_PCI (Closes: #750742)
> 
> entry? That's armhf, not arm64. Or was there a different
> reference that I missed?

I mixed up armhf and arm64 but …

> 
> Anyway, in my 8.5 arm64 guest, virtio-pci doesn't seem to
> be there at all:
> 
>   $ grep VIRTIO /boot/config-3.16.0-4-arm64
>   CONFIG_NET_9P_VIRTIO=m
>   CONFIG_VIRTIO_BLK=m
>   CONFIG_SCSI_VIRTIO=m
>   CONFIG_VIRTIO_NET=m
>   CONFIG_VIRTIO_CONSOLE=m
>   CONFIG_HW_RANDOM_VIRTIO=m
>   CONFIG_VIRTIO=m
>   CONFIG_VIRTIO_BALLOON=m
>   CONFIG_VIRTIO_MMIO=m
>   # CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES is not set

… 4.6.0 has it, including the version available in jessie-backports:

$ grep VIRTIO_PCI boot/config-4.6.0-0.bpo.1-arm64
CONFIG_VIRTIO_PCI=m
CONFIG_VIRTIO_PCI_LEGACY=y

Cheers,
 -- Guido