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xen-devel
Re: [Xen-devel] [PATCH] fxsave/fxrstor adjustments
>>> Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> 24.04.06 18:14 >>>
>
>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?
I just cloned what Andi did for 32- and 64-bit Linux. Andi?
Jan
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