[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH 6/7, RFC] x86_64: basic changes for supporting compatibility mode guest
On 23/8/06 11:32 am, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: > There was one more issue I forgot to mention: We must disable execution of > 'syscall' in some way for compatibility domains. The question is whether to > add respective detection code early into the syscall path (which would affect > performance-wise all 64-bit domains) or whether to {dis,en}able the use of > the instruction in the context switch code by updating EFER as needed > (which would have a performance effect only when switching between > a native and a compatibility domain, but the performance effect would likely > be significantly greater). I'd prefer the second option, not the least because > its implementation is significantly easier. I'm not fussed either way really. It depends how slow it is to update EFER. That'd be easy to check. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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