Re: [libvirt] [RFC] Support for CPUID masking
Jiri Denemark wrote:
Hi,
We need to provide support for CPU ID masking. Xen and VMware ESX are examples
of current hypervisors which support such masking.
My proposal is to define new 'cpuid' feature advertised in guest
capabilities:
...
<domain type='xen' id='42'>
...
<features>
<pae/>
<acpi/>
<apic/>
<cpuid>
<mask level='1' register='ebx'>
xxxx:xxxx:0000:1010:xxxx:xxxx:xxxx:xxxx
</mask>
...
What are your opinions about this?
I think it's too low-level, and the structure is x86-specific. QEMU
and KVM compute their CPUID response based on arguments to the -cpu
argument, e.g.:
-cpu core2duo,model=23,+ssse3,+lahf_lm
I think a similar structure makes more sense for libvirt, where the
configuration generally avoids big blocks of binary data, and the
XML format should suit other architectures as well.
-jim