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Re: [Xen-devel] [RFC 00/10] xen/arm: Implement the hypercall handling in assembly

On 15/12/15 17:51, Julien Grall wrote:
> Hi all,
> This patch aims is a first attempt to write the hypercall dispatch in assembly
> in order to avoid reloading the hypercall arguments from the stack.

Why?  A couple of stack operations are in the noise, performance wise.

I have half a patch series to do exactly the opposite for x86 PV guests,
as C is far more maintainable than asm.


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