Re: [Xen-devel] [PATCH v3 4/5] x86/sysctl: Implement XEN_SYSCTL_get_cpu_policy

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Nov 05, 2018 at 11:16:39AM +0000, Andrew Cooper wrote:
> From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
> 
> Provide a SYSCTL for the toolstack to obtain complete system CPUID and MSR
> policy information.
> 
> For the flask side of things, this subop is closely related to
> {phys,cputopo,numa}info, so shares the physinfo access vector.
> 
> Extend the xen-cpuid utility to be able to dump the system policies.  An
> example output is:
> 
>   Xen reports there are maximum 113 leaves and 3 MSRs
>   Raw policy: 93 leaves, 3 MSRs
>    CPUID:
>     leaf     subleaf  -> eax      ebx      ecx      edx
>     00000000:ffffffff -> 0000000d:756e6547:6c65746e:49656e69
>     00000001:ffffffff -> 000306c3:00100800:7ffafbff:bfebfbff
>     00000002:ffffffff -> 76036301:00f0b5ff:00000000:00c10000
>     00000004:00000000 -> 1c004121:01c0003f:0000003f:00000000
>     00000004:00000001 -> 1c004122:01c0003f:0000003f:00000000
>     00000004:00000002 -> 1c004143:01c0003f:000001ff:00000000
>     00000004:00000003 -> 1c03c163:03c0003f:00001fff:00000006
>     00000005:ffffffff -> 00000040:00000040:00000003:00042120
>     00000006:ffffffff -> 00000077:00000002:00000009:00000000
>     00000007:00000000 -> 00000000:000027ab:00000000:9c000000
>     0000000a:ffffffff -> 07300403:00000000:00000000:00000603
>     0000000b:00000000 -> 00000001:00000002:00000100:00000000
>     0000000b:00000001 -> 00000004:00000008:00000201:00000000
>     0000000d:00000000 -> 00000007:00000340:00000340:00000000
>     0000000d:00000001 -> 00000001:00000000:00000000:00000000
>     0000000d:00000002 -> 00000100:00000240:00000000:00000000
>     80000000:ffffffff -> 80000008:00000000:00000000:00000000
>     80000001:ffffffff -> 00000000:00000000:00000021:2c100800
>     80000002:ffffffff -> 65746e49:2952286c:6f655820:2952286e
>     80000003:ffffffff -> 55504320:2d334520:30343231:20337620
>     80000004:ffffffff -> 2e332040:48473034:0000007a:00000000
>     80000006:ffffffff -> 00000000:00000000:01006040:00000000
>     80000007:ffffffff -> 00000000:00000000:00000000:00000100
>     80000008:ffffffff -> 00003027:00000000:00000000:00000000
>    MSRs:
>     index    -> value
>     000000ce -> 0000000080000000
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> ---
> CC: Jan Beulich <JBeulich@xxxxxxxx>
> CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> CC: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
> CC: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
> 
> v2:
>  * Avoid introducing a Spectre V1 gadget
> v3:
>  * Reorganise logic
> ---
>  tools/libxc/include/xenctrl.h       |  6 +++
>  tools/libxc/xc_cpuid_x86.c          | 57 ++++++++++++++++++++++++
>  tools/misc/xen-cpuid.c              | 86 
> +++++++++++++++++++++++++++++++++++--

Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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