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    SubjectRe: [RFC PATCH crypto] AES: Add support to Intel AES-NI instructions
    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.


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