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. Unfortunately, I tried the same setup with an up-to-date Debian testing guest and I was still unable to boot it with virtio-pci disk and network. Support for this kind of setup is still far from being ready for mass consumption, I'm afraid. -- Andrea Bolognani / Red Hat / Virtualization