Re: [libvirt] Question about virtio-pci in Aarch64

On Wed, 2016-08-17 at 09:18 -0400, Cole Robinson wrote: > > I have changed the libvirt to 1.3.5 now, also add the pci to net-device xml like:  > >  <address type='pci'/>,then use the virsh to boot the VM,the total xml file is: > >  https://paste.fedoraproject.org/409534/71434141/ > >  > > After booting, the eth0 device disappear(eth0 occur when the address is > > virtio-mmio), > > but I can find another net-device, also it can't work for dhcp:  > > 2: enp2s1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state > > UP group default qlen 1000 > >     link/ether 52:54:00:0d:25:26 brd ff:ff:ff:ff:ff:ff > >     inet6 fe80::5054:ff:fe0d:2526/64 scope link  > >        valid_lft forever preferred_lft forever > > Running lspci: > > 02:01.0 Ethernet controller: Red Hat, Inc Virtio network device > >  > > My question is:  > > 1. I use Debian 8 AArch64 as the Guest OS, do you think the virtio-pci for > > net-device works is OK ? >  > My guess is that the support isn't complete. Last I checked Fedora doesn't > even work with aarch64 virtio-pci + uefi, because it requires some kernel > changes that haven't been fully upstreamed yet. But that was several months > ago... There may be a way to work around it nowadays but I don't personally > know. You may want to test with either RHELSA if you have a copy, or linaro > images. >  > > 2. If I change the disk address-type to pci(Libvirt pass the virtio pci > > parameters to Qemu for disk device), but I can't boot  > > the VM. Does Qemu not support virtio pci for  disk device in AArch64? >  > That should work fine in my testing with RHELSA, so I don't think it's a > libvirt or qemu limitation. Probably the guest OS + UEFI. Looks like Debian 8.5 simply doesn't include virtio-pci support:   $ lsinitramfs /boot/initrd.img | grep virtio   lib/modules/3.16.0-4-arm64/kernel/drivers/scsi/virtio_scsi.ko   lib/modules/3.16.0-4-arm64/kernel/drivers/block/virtio_blk.ko   lib/modules/3.16.0-4-arm64/kernel/drivers/virtio   lib/modules/3.16.0-4-arm64/kernel/drivers/virtio/virtio_ring.ko   lib/modules/3.16.0-4-arm64/kernel/drivers/virtio/virtio_mmio.ko   lib/modules/3.16.0-4-arm64/kernel/drivers/virtio/virtio.ko   lib/modules/3.16.0-4-arm64/kernel/drivers/net/virtio_net.ko   $ modprobe virtio-pci   modprobe: FATAL: Module virtio-pci not found. I think kernel 3.16.0 is simply too old.