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

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 01/09/2017 06:03 AM, Andrew Cooper wrote:
> 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: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>


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