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Re: [Xen-devel] [PATCH 6/7, RFC] x86_64: basic changes for supporting co
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH 6/7, RFC] x86_64: basic changes for supporting compatibility mode guest |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Wed, 23 Aug 2006 11:33:55 +0100 |
| Delivery-date: | Wed, 23 Aug 2006 03:34:13 -0700 |
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| Thread-topic: | [Xen-devel] [PATCH 6/7, RFC] x86_64: basic changes for supporting compatibility mode guest |
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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
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