Re: [Xen-devel] [HYBRID]: XEN_EMULATE_PREFIX in user process

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-06-29 at 08:56 +0100, Jan Beulich wrote:
> >>> On 29.06.12 at 03:00, Mukesh Rathor <mukesh.rathor@xxxxxxxxxx> wrote:
> > BTW, for cpuid vmexit, if kernel mode I call pv_cpuid, if user mode, I
> > just return cpuid values, as that's what would happen without the HVM
> > container.
> 
> Which means you're not leveraging one of the things you could
> gain from hybrid (after all, returning the native value to user
> mode is one of the weaknesses of PV).

cpuid masking could happen in the HVM layer too, couldn't it?

Probably "XEN_EMULATE_PREFIX cpuid" and raw "cpuid" ought to return the
same set of PV values in hybrid?

Ian.



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