Re: [Xen-devel] Support for SSE/MMX instructions.

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 20 Apr 2006, at 16:37, Petersson, Mats wrote:

> 1. Is anyone else working on anything like this (expanding the valid
> instructions that can access memory-mapped IO to include either SSE or
> MMX instructions?)
I don't think so. Best would be to move all HVM I/O emulation to the 
common Xen emulator (x86_emulate.c) and add the needed emulation there. 
Either way I expect that we will only need to emulate a very few SSE 
instructions (I expect this case is the result of an optimised 
memset()?).
> 2. Does anyone have a hint on how we best get the MMX and SSE registers
> so that they can be accessed in hvm/platform.c?
Call unlazy_fpu(current) and then read/write the appropriate fields in
current->arch.guest_context.fpu_ctxt.

 -- Keir


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