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Description of problem: Customer has HP BL460c G5 blades with Intel Xeon E7440 Dunnington (Penryn) processors. Customer creates a KVM guest using virt-manager and after building would like to change the processor to Penryn. Guest will not boot with following error resulting:
libvirtError: internal error guest CPU is not compatible with host CPU
Click "copy host cpu configuration" and instead of showing the Penryn processor it will show "Pentium III".
Version-Release number of selected component (if applicable):
virt-manager-0.8.6-4.el6.noarch
How reproducible:
Always,
Steps to Reproduce:
1. on BL460c G5 with E7440 processors, create KVM guest using default options for CPU.
2. build guest and see it properly boot.
3. Stop the guest and edit the configuration through virt-manager and see choose Penryn processor in CPU configuration. Guest will not boot with error about incompatible CPU.
4. Click on "Copy Host CPU configuration" and it will select the Pentium III which is incorrect.
Actual results:
libvirtError: internal error guest CPU is not compatible with host CPU
Click "copy host cpu configuration" and instead of showing the Penryn processor it will show "Pentium III".
Expected results:
Either specifying "Penryn" or using the copy Host CPU configuration button will result in Penryn and a successful KVM guest boot.
Additional info:
I think everything is working correctly here, it's just how libvirt notates what CPU the host is using. It has some internal definitions, and if your host does not expose all the flag values it has listed for 'Penryn' it finds the next CPU that it fully matches (in this case 'Pentium III') and then lists each additional flag individually. This can be seen in the <host> section of 'virsh capabilities'
Does 'copy host configuration' should be exposing every host cpu flag to the guest, even if it isn't using the expected CPU name. So I don't think there's a bug here.
We can't get further access to the systems exhibiting the behavior, so I have to close this as insufficent data. Please don't hesitate to reopen if the systems become available.
Comment 13Michal Privoznik
2012-02-03 12:37:40 UTC
Kevin and others.
I've helped a guy with the very same problem as here. And it turned out, he has 'nx' flag disabled (No eXecution) in BIOS. Re-enabling it made the problem go away.
Comment 14Rodrigo A B Freire
2012-02-03 12:40:51 UTC