[libvirt-users] Help With Nested Virtualization
Brandon Golway
brando56894 at gmail.com
Tue Aug 30 01:42:17 UTC 2016
(Copied from my post on the Arch Linux forums:
https://bbs.archlinux.org/viewtopic.php?pid=1650650#p1650650)
I have a FreeNAS 10 KVM setup via libvirt on my Arch server and I'd like to
be able to test out the virtualization features in the nightly FreeNAS 10
builds but the problem is that I can't seem to get VT-x to correctly pass
through to the guest. I have followed the [u][url=
https://wiki.archlinux.org/index.php/KVM#Nested_virtualization]Nested
Virtualization[/url][/u] section of the KVM wiki and I'm sure it's
supported and enabled.
Here's proof
[code] [bran at nas ~]$ sudo systool -m kvm_intel -v | grep nested
nested = "Y"
[bran at nas ~]$ lscpu|grep Virtualization
Virtualization: VT-x[/code]
So the host/hardware isn't the problem, I believe the problem lies within
libvirt.
RedHat says to use [b]copy host CPU configuration[/b] or
[b]host-passthrough[/b], with the latter being preferred. If I use the
former I get the [b]CMT not supported[/b] error, but if I type in
[b]host-passthrough[/b] which according to [u][url=
https://bbs.archlinux.org/viewtopic.php?id=214539]this post[/url][/u]
should work. When I set [b]host-passthrough[/b] it allows the system to
boot up, but when I try to start a guest FreeNAS gives me the error that
VT-x instructions aren't available, I have no idea how to check them either
since the [b]proc[/b] pseudo-filesystem doesn't exist in BSD. I know for a
fact that this isn't a problem with the FreeNAS builds because I've been
testing them out for months on my Windows 10 desktop via VMware and nested
virtualization works without issue, so it must be an issue with
KVM/libvirt.
Can someone clue me in on what the issue is?
Here's the entire XML config for the FreeNAS VM
[code]<!--
WARNING: THIS IS AN AUTO-GENERATED FILE. CHANGES TO IT ARE LIKELY TO BE
OVERWRITTEN AND LOST. Changes to this xml configuration should be made
using:
virsh edit FreeNAS_10
or other application using the libvirt API.
-->
<domain type='kvm'>
<name>FreeNAS_10</name>
<uuid>ea816b85-7685-495a-bc97-28a882f190d7</uuid>
<title>FreeNAS v10</title>
<description>Nightly Alpha Test Releases</description>
<memory unit='KiB'>6340608</memory>
<currentMemory unit='KiB'>6340608</currentMemory>
<vcpu placement='static'>4</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-2.6'>hvm</type>
<bootmenu enable='no'/>
</os>
<features>
<acpi/>
<apic/>
<vmport state='off'/>
</features>
<cpu mode='host-passthrough'/>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/sbin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/mnt/storage/vm-storage/FreeNAS_Disk1.img'/>
<target dev='vdb' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07'
function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/mnt/storage/vm-storage/FreeNAS_Disk2.img'/>
<target dev='vdc' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08'
function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/mnt/storage/vm-storage/FreeNAS_Disk3.img'/>
<target dev='vdd' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09'
function='0x0'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='directsync' io='native'/>
<source file='/var/lib/libvirt/images/FreeNAS_10.img'/>
<target dev='vde' bus='virtio'/>
<boot order='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06'
function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hda' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x1'/>
</controller>
<controller type='virtio-serial' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:24:5c:08'/>
<source bridge='vmbridge'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
<serial type='pty'>
<target port='0'/>
</serial>
<console type='pty'>
<target type='serial' port='0'/>
</console>
<channel type='spicevmc'>
<target type='virtio' name='com.redhat.spice.0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>
<listen type='address' address='0.0.0.0'/>
</graphics>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'
primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</video>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='1'/>
</redirdev>
<redirdev bus='usb' type='spicevmc'>
<address type='usb' bus='0' port='2'/>
</redirdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0a'
function='0x0'/>
</memballoon>
</devices>
</domain>[/code]
Thanks,
Brandon Golway
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