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Description of problem:
libvirt should give a nicer error message when intremap='split' in iommu device
Version-Release number of selected component (if applicable):
libvirt-3.2.0-6.el7
How reproducible:
100%
Steps to Reproduce:
1.Prepare a guest and add the xml as below without add " <ioapic driver='qemu'/> "
<iommu model='intel'>
<driver intremap='on'/>
</iommu>
2.Start the guest and get the error
# virsh start q35-js
error: Failed to start domain q35-js
error: internal error: qemu unexpectedly closed the monitor: 2017-05-26T06:23:33.798217Z qemu-kvm: -chardev pty,id=charserial0: char device redirected to /dev/pts/1 (label charserial0)
2017-05-26T06:23:33.857340Z qemu-kvm: -device intel-iommu,intremap=on: Intel Interrupt Remapping cannot work with kernel-irqchip=on, please use 'split|off'.
3.change the attribute intremap='split' but also get error
<iommu model='intel'>
<driver intremap='split'/>
</iommu>
# virsh edit q35-js
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,?]:
error: XML error: unknown intremap value: split
Actual results:
intremap='split' is not supported, but libvirt gives a confusing error info in step2
Expected results:
libvirt should give a nicer error message when 'intremap='split' or libvirt should support 'intremap='split'
Additional info:
N/A
Pushed upstream as:
commit 90cd99a42e1afabc57f70a0e1e17e27f986ae04f
Author: Ján Tomko <jtomko>
CommitDate: 2017-09-11 14:56:07 +0200
conf: validate IOMMU interrupt remapping setting
This option requires:
<ioapic driver='qemu'/>
Report an error in case someone tries to combine
it with different ioapic setting.
Setting 'eim' on without enabling 'intremap' does not make sense.
https://bugzilla.redhat.com/show_bug.cgi?id=1457610
git describe: v3.7.0-40-g90cd99a42
Hi Ján,
With libvirt-3.8.0-1.el7.x86_64, I found something wrong when I add the xml as below to guest no matter add <ioapic driver='qemu'/> or not.
<iommu model='intel'>
<driver intremap='on' caching='on'/>
</iommu>
# virsh edit q35-js
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
But with xml as below , the output are as expected.
<iommu model='intel'>
<driver intremap='on'/>
</iommu>
and
<iommu model='intel'>
<driver intremap='on' eim='on'/>
</iommu>are as expected.
(1) with <ioapic driver='qemu'/> , the xml as below can be edit and start successfully.
(2) Without <ioapic driver='qemu'/>, the guest will output as below
# virsh edit q35-js
error: XML error: IOMMU interrupt remapping requires split I/O APIC (ioapic driver='qemu')
Failed. Try again? [y,n,i,f,?]:
Thanks‘s Ján' reply so soon and so sorry that I made a mistake.
Add the xml as below to guest xml.
<iommu model='intel'>
<driver intremap='on' caching_mode='on'/>
</iommu>
(1) with <ioapic driver='qemu'/> , the guest can be edit and start successfully.
(2) without <ioapic driver='qemu'/>, the guest get the output as below.
# virsh edit q35-js
error: XML error: IOMMU interrupt remapping requires split I/O APIC (ioapic driver='qemu')
Failed. Try again? [y,n,i,f,?]:
So with the comment 5 and comment 7, I change the status to verified
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHEA-2018:0704
Description of problem: libvirt should give a nicer error message when intremap='split' in iommu device Version-Release number of selected component (if applicable): libvirt-3.2.0-6.el7 How reproducible: 100% Steps to Reproduce: 1.Prepare a guest and add the xml as below without add " <ioapic driver='qemu'/> " <iommu model='intel'> <driver intremap='on'/> </iommu> 2.Start the guest and get the error # virsh start q35-js error: Failed to start domain q35-js error: internal error: qemu unexpectedly closed the monitor: 2017-05-26T06:23:33.798217Z qemu-kvm: -chardev pty,id=charserial0: char device redirected to /dev/pts/1 (label charserial0) 2017-05-26T06:23:33.857340Z qemu-kvm: -device intel-iommu,intremap=on: Intel Interrupt Remapping cannot work with kernel-irqchip=on, please use 'split|off'. 3.change the attribute intremap='split' but also get error <iommu model='intel'> <driver intremap='split'/> </iommu> # virsh edit q35-js 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,?]: error: XML error: unknown intremap value: split Actual results: intremap='split' is not supported, but libvirt gives a confusing error info in step2 Expected results: libvirt should give a nicer error message when 'intremap='split' or libvirt should support 'intremap='split' Additional info: N/A