Re: [Xen-devel] mmx sse emulation

["Ashish Bijlani" <ashish.bijlani@xxxxxxxxx>]

Hi Keir,

Thanks for the help. I've one more doubt though.

Calling x86_emulate from do_device_not_available after validating the
EM flag would work? Of course provided MMX/SS emulation code reside in
x86_emulate. Please lemme know.

Thanks,
Ashish

On Wed, Nov 5, 2008 at 2:34 AM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> On 5/11/08 00:34, "Ashish Bijlani" <ashish.bijlani@xxxxxxxxx> wrote:
>
>>
>> I want to emulate mmx/sse for hvm guests when applications inside hvm
>> guests are compiled for mmx/sse but the underlying hardware doesn't
>> support mmx/sse. What is the best place to do this? i'm looking at
>> x86_emulate but i dunno if that is the best place to put the emulation
>> layer. any suggestions?? also, currently movq emulation is present in
>> x86_emulate for handling mmio. however, i realized that get_fpu fails
>> if the hardware doesn't have mmx capability. is it true or am i
>> missing something here?
>
> x86_emulate() does its work by using the actual underlying processor
> instructions (really it is a system emulator rather than an instruction
> emulator). This wouldn't necessarily stop you adding full emulation for
> certain instructions like SSE/MMX though, and it's probably the right place
> to put that sort of thing.
>
>  -- Keir
>
>
>

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