Re: [Xen-devel] [PATCH] fxsave/fxrstor adjustments

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 24 Apr 2006, at 16:31, Jan Beulich wrote:

> This patch addresses CVE-2006-1056 (information leak from 
> fxsave/fxrstor on AMD CPUs) and also adjusts 64-bit handling
> so that full 64-bit RIP/RDP values get saved/restored. More 
> fine-grained handling may be needed if 32-bit processes are
> expected to properly see their selectors (native Linux doesn't 
> currently do that either, but there is a patch to adjust
> it there).
Why does this patch (and the one in Linux 2.6.16.9) use 'emms' in the 
fxsave path rather than 'ffree st(7)' which is what AMD recommends in 
their published advisory? Is the former faster?
 -- Keir


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