Re: [Xen-devel] [PATCH RFC] x86/sysctl: Implement XEN_SYSCTL_get_cpuid_policy

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Jul 27, 2017 at 06:48:15PM +0100, Andrew Cooper wrote:
> Provide a SYSCTL for the toolstack to obtain complete system cpuid policy
> information.  The CPUID information is serialised as an array of 6x 32bit
> integers, and a mechanism is provided to query the maximum number of entries
> Xen might write.
> 
> For the XSM side of things, this subop is closely related to
> {phys,cputopo,numa}info, so shares the physinfo access vector.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
> CC: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
> 
> Partly RFC, to get a feel for the seralised format. With a suitably extended
> ./xen-cpuid, the raw and host policies for one of my testboxes are as follows:
> 

I'm happy with the output format as long as it is documented. ;)

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