|Subject:||Re: [Qemu-discuss] problem with virtio disk driver|
|Date:||Fri, 21 Oct 2016 14:47:53 +0100|
I just ran into a problem I can't make heads or tails of, so I'm hoping to get some help here.I have a custom built Embedded Linux as host, running qemu-kvm 1.1.2 and libvirt 1.2.20I'm creating a domain with the following config:<domain type='kvm'><name>myVM</name><memory unit='KiB'>2097152</memory><vcpu placement='static'>2</vcpu><os><type arch='x86_64'>hvm</type><boot dev='hd'/><boot dev='cdrom'/></os><features><acpi/><apic/></features><cpu mode='host-model'/><clock offset='utc'><timer name='rtc' tickpolicy='catchup'/><timer name='pit' tickpolicy='delay'/><timer name='hpet' present='no'/></clock><on_poweroff>destroy</on_power
off><on_reboot>restart</on_reboot><on_crash>restart</on_crash><devices><disk type='file' device='cdrom'><driver name='qemu' type='raw'/><target dev='hdb' bus='ide'/><source file='custom.iso'/><readonly/></disk><disk type='file' device='disk'><driver name='qemu' type='qcow2'/><source file='/path/to/vdisk.img'/><target dev='vda' bus='virtio'/></disk><controller type='pci' model='pci-root'/><controller type='usb'/><controller type='ide'/><interface type='bridge'><source bridge='virbr0'/><model type='virtio'/></interface><serial type='pty'><target port='0'/></serial><console type='pty'><target type='serial' port='0'/></console><input type='tablet' bus='usb'/><input type='mouse' bus='ps2'/><input type='keyboard' bus='ps2'/><graphics type='vnc' port='-1' autoport='yes'/><video><model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/></video><watchdog model='i6300esb' action=""><memballoon model='none'/></devices></domain>Granted the guest OS I'm installing is again a custom Linux with some software running on top ..so It's not a well known OS...but I'm hoping that does not matter much.After installation I get all sorts of kernel panics and errors about services not being able to start.I tried the same thing on ubuntu 14.04.2 LTS (host) which installed qemu-kvm 2.0.0 and libvirt 1.2.2Same config xml, but this time it worked better -I was not getting the kernel panics.The OS I'm installing does not support IDE disks, it needs a virtio disk.I ran a second test, this time installing ubuntu 14.04 as the guest on both hosts (ubuntu vs embedded Linux) and again I had problems with which point to the virtio driver.On the ubunutu host everyhing was fineOn the Embedded Linux host, the installation failed early on with the error:The attempt to mount a file system with type ext4 in Virtual disk1, partition#1 (vda1) at / failedIf I switch to an ide disk drive instead of virtio, everything works fine.Thinking it might be because I had an old version of qemu I upgraded qemu to v 2.6.0. And got the same behavior.At this point I'm running out of ideas and I'm not sure what else I can try. Any suggestions are appreciated.Thanks,Andrei
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