Cannot turn iommu on inside guest
So I want to turn iommu support on in a guest ( <type arch='x86_64' machine='pc-q35-4.1'>hvm</type>). Per [1] I tried to add to devices either <devices> <iommu model='intel'> <driver intremap='on'/> </iommu> </devices> or just a simpler <devices> <iommu model='intel /'> </devices> However, when I try to boot it, it crashes with the following error message (stolen from /var/log/libvirt/qemu/testkvm.log): 2020-02-11T05:13:27.278707Z qemu-system-x86_64: We need to set caching-mode=on for intel-iommu to enable device assignment with IOMMU protection. 2020-02-11 05:13:27.577+0000: shutting down, reason=crashed that sounds like it wants me to do something like qemu-system-x86_64 [...] -device intel-iommu,intremap=on,caching-mode=on[2] using virsh. But <devices> <iommu model='intel'> <driver intremap='on' caching-mode='on '/> </iommu> </devices> is not only not mentioned in [1] but also fails [root@testbox tests]# virsh edit testkvm error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng Extra element devices in interleave Element domain failed to validate content Failed. Try again? [y,n,i,f,?]: Can anyone show me what I am missing here? [1] https://libvirt.org/formatdomain.html#elementsIommu [2] https://wiki.qemu.org/Features/VT-d#Command_Line_Example_2
On Tue, Feb 11, 2020 at 09:09:36AM -0500, Mauricio Tavares wrote:
So I want to turn iommu support on in a guest ( <type arch='x86_64' machine='pc-q35-4.1'>hvm</type>). Per [1] I tried to add to devices either
<devices> <iommu model='intel'> <driver intremap='on'/> </iommu> </devices>
or just a simpler
<devices> <iommu model='intel /'> </devices>
However, when I try to boot it, it crashes with the following error message (stolen from /var/log/libvirt/qemu/testkvm.log):
2020-02-11T05:13:27.278707Z qemu-system-x86_64: We need to set caching-mode=on for intel-iommu to enable device assignment with IOMMU protection. 2020-02-11 05:13:27.577+0000: shutting down, reason=crashed
that sounds like it wants me to do something like
qemu-system-x86_64 [...] -device intel-iommu,intremap=on,caching-mode=on[2]
using virsh. But
<devices> <iommu model='intel'> <driver intremap='on' caching-mode='on '/>
You need caching_mode="on" - notice underscore, not hypehn
</iommu> </devices>
is not only not mentioned in [1] but also fails
The correctly spelt caching_mode is mentioned there.
[root@testbox tests]# virsh edit testkvm error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng Extra element devices in interleave Element domain failed to validate content
Failed. Try again? [y,n,i,f,?]:
Can anyone show me what I am missing here?
[1] https://libvirt.org/formatdomain.html#elementsIommu [2] https://wiki.qemu.org/Features/VT-d#Command_Line_Example_2
Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
On Tue, Feb 11, 2020 at 9:17 AM Daniel P. Berrangé <berrange@redhat.com> wrote:
On Tue, Feb 11, 2020 at 09:09:36AM -0500, Mauricio Tavares wrote:
So I want to turn iommu support on in a guest ( <type arch='x86_64' machine='pc-q35-4.1'>hvm</type>). Per [1] I tried to add to devices either
<devices> <iommu model='intel'> <driver intremap='on'/> </iommu> </devices>
or just a simpler
<devices> <iommu model='intel /'> </devices>
However, when I try to boot it, it crashes with the following error message (stolen from /var/log/libvirt/qemu/testkvm.log):
2020-02-11T05:13:27.278707Z qemu-system-x86_64: We need to set caching-mode=on for intel-iommu to enable device assignment with IOMMU protection. 2020-02-11 05:13:27.577+0000: shutting down, reason=crashed
that sounds like it wants me to do something like
qemu-system-x86_64 [...] -device intel-iommu,intremap=on,caching-mode=on[2]
using virsh. But
<devices> <iommu model='intel'> <driver intremap='on' caching-mode='on '/>
You need caching_mode="on" - notice underscore, not hypehn
Much happier. Thanks!
</iommu> </devices>
is not only not mentioned in [1] but also fails
The correctly spelt caching_mode is mentioned there.
[root@testbox tests]# virsh edit testkvm error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng Extra element devices in interleave Element domain failed to validate content
Failed. Try again? [y,n,i,f,?]:
Can anyone show me what I am missing here?
[1] https://libvirt.org/formatdomain.html#elementsIommu [2] https://wiki.qemu.org/Features/VT-d#Command_Line_Example_2
Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
participants (2)
-
Daniel P. Berrangé -
Mauricio Tavares