Re: [RFC PATCH 0/3] generic hypercall support

Avi Kivity
2009-05-07T18:06:49Z

Gregory Haskins wrote:
> I completed the resurrection of the test and wrote up a little wiki on
> the subject, which you can find here:
>
> http://developer.novell.com/wiki/index.php/WhyHypercalls
>
> Hopefully this answers Chris' "show me the numbers" and Anthony's "Why
> reinvent the wheel?" questions.
>
> I will include this information when I publish the updated v2 series
> with the s/hypercall/dynhc changes.
>
> Let me know if you have any questions.
>

Well, 420 ns is not to be sneezed at.

What do you think of my mmio hypercall? That will speed up all mmio to
be as fast as a hypercall, and then we can use ordinary mmio/pio writes
to trigger things.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.