Re: [Xen-devel] [PATCH v2 01/25] x86/cpuid: Introduce guest_cpuid() and struct cpuid_leaf

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Monday, January 09, 2017 7:03 PM
> 
> Longterm, pv_cpuid() and hvm_cpuid() will be merged into a single
> guest_cpuid(), which is also capable of working outside of current context.
> 
> To aid this transtion, introduce guest_cpuid() with the intended API, which
> simply defers back to pv_cpuid() or hvm_cpuid() as appropriate.
> 
> Introduce struct cpuid_leaf which is used to represent the results of a CPUID
> query in a more efficient mannor than passing four pointers through the
> calltree.
> 
> Update all codepaths which should use the new guest_cpuid() API.  These are
> the codepaths which have variable inputs, and (other than some specific
> x86_emulate() cases) all pertain to servicing a CPUID instruction from a
> guest.
> 
> The other codepaths using {pv,hvm}_cpuid() with fixed inputs will later be
> adjusted to read their data straight from the policy block.
> 
> No intended functional change.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevint.tian@xxxxxxxxx>

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