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xen-devel
Re: [Xen-devel] [PATCH] libxc: set CPUID topology leaf as unsupported fo
>>> On 14.07.11 at 16:25, David Vrabel <david.vrabel@xxxxxxxxxx> wrote:
> On 14/07/11 14:30, Keir Fraser wrote:
>> On 14/07/2011 12:50, "David Vrabel" <david.vrabel@xxxxxxxxxx> wrote:
>>
>>> libxc: set CPUID topology leaf as unsupported for PV guests
>>>
>>> The result of a CPUID Extended Topology Enumeration leaf for PV guests
>>> is invalid as the level in ECX is ignored. This can cause some guests
>>> to loop endlessly when trying to enumerate the topology.
>>>
>>> Since the physical topology isn't useful to PV guests set the topology
>>> leaf as unsupported.
>>
>> For future reference, you also need to modify
>> xen/arch/x86/traps.c:pv_cpuid(), for dom0.
>
> Looking at the code it looks like dom0 would at least see valid data for
> the the topology leaf. But I guess the info makes no sense to dom0 as
> well as domU guests. Patch sent if you've not already fixed it up.
It may make limited sense to Dom0 if "dom0_vcpus_pin" is in effect.
Jan
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