[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] sse, mmx support for hvm guests
it's just masking the sse/mmx features from cpuid return value or something more to it? because i tried masking sse/mmx features from cpuid and now the hvm domain doesn't boot!! any idea if sse/mmx support can be disabled using bios? Thanks, Ashish On Sat, Oct 25, 2008 at 7:13 PM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote: > On 25/10/08 20:34, "Ashish Bijlani" <ashish.bijlani@xxxxxxxxx> wrote: > >> I've a quad-core x86_64 machine (Intel Xeon), with sse/mmx support. >> However, I want to disable sse/mmx support from HVM guests. How can I >> do this? Also, is it reasonable to expect illegal instruction fault in >> non-root VMX mode if a guest VM runs an application with sse/mmx >> instructions? > > You can hide SSE/MMX in CPUID info, so the guest should not attempt to use > the instructions. This is obviously true since CPUID causes vmexit and then > the instruction is always emulated. But I don't think you can make the > sse/mmx instructions fault if the guest does actually try to use them > anyway. > > -- Keir > > > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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