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Re: [Xen-devel] Support for SSE/MMX instructions.
| To: | "Petersson, Mats" <Mats.Petersson@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Support for SSE/MMX instructions. |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 20 Apr 2006 16:59:56 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 20 Apr 2006 09:00:18 -0700 |
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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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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