Re: [Xen-devel] [Patch] x86emul: simplify prefix handling for VMFUNC

["Lai, Paul" <paul.c.lai@xxxxxxxxx>]

On Tue, Sep 20, 2016 at 09:50:15AM -0600, Jan Beulich wrote:
> 
> Paul, there's been no reply to
> https://lists.xenproject.org/archives/html/xen-devel/2016-09/msg00380.html
> 
> Jan
> 

Jan:

The refered to patch, commit a1b1572833, adds a check for vmfunc.
I look a little time to look at the SDM and finally found the reference.
The vmfunc can be found in Table A-6 "Opcode Extensions for One- and Two-
byte Opcodes by Group Number" on page A-18 Vol. 2D of the
 e64-ia-32-architectures-software-developer-manual-325462.pdf.
The values for vmfunc match the values in the code.
I also took the liberty of looking at the other existing cases in the
switch statement, and can find RDTSCP and INVLPG. The CLZERO extension
value is a mystery to me.

I also tried to find the original email referred to by the URL above, but
could not in my mail archives.  Somehow it did not get to me, so I'm replying
to this email (with modified subject line) and Cc'ing Andy, Ravi, and xen-devel.

-Paul

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