Re: [Xen-devel] [PATCH] x86emul: support clzero

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 22/09/15 14:06, Jan Beulich wrote:
> ... in anticipation of this possibly going to get used by guests for
> basic thinks like memset() or clearing or pages.
>
> Since the emulation doesn't use clzero itself, checking the guest's
> CPUID for the feature to be exposed is (intentionally) being avoided
> here. All that's required is sensible guest side data for the clflush
> line size.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

Where have you found this instruction?  Googling, I have found a
presentation talking about it being new in the new AMD Zen cores, but I
still can't locate any technical documentation on the matter.

~Andrew

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