Messages in this thread | | | Date | Mon, 15 Dec 2008 10:26:54 -0800 | From | Suresh Siddha <> | Subject | Re: [RFC PATCH crypto] AES: Add support to Intel AES-NI instructions |
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On Sun, Dec 14, 2008 at 07:38:42PM -0800, Herbert Xu wrote: > On Mon, Dec 15, 2008 at 10:19:02AM +0800, Huang Ying wrote: > > > > The general x86 implementation is used as the fall back for new AES-NI > > based implementation. Because AES-NI can not be used in kernel soft_irq > > context. If crypto layer is used to access general x86 implementation, > > Why is that? The VIA PadLock also "touches" the SSE state but we still > use it on softirq paths. > > In fact Suresh told me earlier that your AES instruction wasn't > going to have the SSE problems that VIA had, is this not the case?
As Huang mentioned, AES instructions touch SSE registers and thus have different requirements. I agree that we have to do some performance analysis to come up with the optimized model.
thanks, suresh
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