Re: [Xen-devel] [PATCH] tools/misc: Tweak reserved bit handling for xen-cpuid

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Feb 27, 2018 at 04:28:30PM +0000, Andrew Cooper wrote:
> Instead of printing REZ, use NULL pointers to indicate missing information,
> and have dump_leaf() print out the bit which is unknown.
> 
> E.g.
> 
> ....
> Dynamic sets:
> Raw                       
> 178bfbff:fed8320b:2fd3fbff:35c233ff:0000000f:209c01a9:00000000:00006799:00001007:00000000
>   [00] 0x00000001.edx     fpu vme de pse tsc msr pae mce cx8 apic sysenter 
> mtrr pge  ...
>   [01] 0x00000001.ecx     sse3 pclmulqdq monitor ssse3 fma cx16 sse41 sse42 
> movebe   ...
>   [02] 0x80000001.edx     fpu vme de pse tsc msr pae mce cx8 apic syscall 
> mtrr pge   ...
>   [03] 0x80000001.ecx     lahf_lm cmp svm extapic cr8d lzcnt sse4a msse 
> 3dnowpf osvw ...
>   [04] 0x0000000d:1.eax   xsaveopt xsavec xgetbv1 xsaves
>   [05] 0x00000007:0.ebx   fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap 
> clflushopt sha
>   [06] 0x00000007:0.ecx
>   [07] 0x80000007.edx     <BIT0> <BIT3> <BIT4> <BIT7> itsc <BIT9> efro 
> <BIT13> <BIT14>
>   [08] 0x80000008.ebx     clzero <BIT1> <BIT2> ibpb
>   [09] 0x00000007:0.edx
> ...
> 
> which is the output on an AMD EPYC system, where Xen doesn't know about, and
> has therefore masked, most of the more advanced thermal/perf features.
> 
> 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>
> 
> Hey look - I've finally got back to some CPUID work...

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

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