Re: [Xen-devel] PV-vNUMA issue: topology is misinterpreted by the guest

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 07/23/2015 03:25 AM, Jan Beulich wrote:
> > > > On 22.07.15 at 20:10, <boris.ostrovsky@xxxxxxxxxx> wrote:
> > I don't think this is currently doable with what we have for CPUID
> > support in xl syntax. I am pretty sure we need to at least be able to
> > specify all leaf 4's indexes. And we can't.
> >
> > BTW, irrespective of this particular problem, adding support for indexed
> > CPUID leaves would be a good idea.
> So what is it that makes you think this doesn't work already?
> xc_cpuid_policy() intentionally has "input" as a pointer,
> allowing not just EAX to be specified. And libxl_cpuid.c also
> has
>
> static const char *input_names[2] = { "leaf", "subleaf" };
Right. I wasn't aware of this and until I looked at 
libxl_cpuid_parse_config_xend() I wouldn't have known what the syntax 
for specifying subleaves is because we don't describe it in xl man page 
(at least I can't find it).
In which case we may be able to adjust them and see what effect they have.


-boris

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