Re: [Xen-devel] Is it safe to hvm_emulate_one() an MMX instruction?

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.04.13 at 11:30, Razvan Cojocaru <rzvncj@xxxxxxxxx> wrote:
> assuming that RIP points to just before a MMX instruction (such as
> 'movdqu [some_address],xmm0'), is it safe to call hvm_emulate_one() in
> the hypervisor? Are MMX instructions handled in a special manner?

So do you mean an MMX instruction, or MOVDQU (which is an XMM
one)? In any event, 4.2 and later should be fine with this particular
instruction (and a few more move variants), but 4.1.x and earlier
won't be, nor does the emulator support the whole spectrum of
MMX, XMM, and AVX instructions.

Jan


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