Re: [Xen-devel] Re: Improving hvm IO performance by using self IO emulator (YA io-emu?)

[Tristan Gingold <tgingold@xxxxxxx>]

On Thu, Feb 22, 2007 at 09:41:20PM +0000, Mark Williamson wrote:
> While I'm thinking about it, I wonder how returning to the guest from the 
> emulator would work...
> 
> We'd want to hypercall to transfer back to it...  do we need specific Xen 
> support for this or could (for instance) Gerd's work on domU kexec be 
> leveraged here?
> 
> Perhaps it would be worth evaluating some kind of "send these events and then 
> switch back to guest code" hypercall so that the emulator doesn't have to 
> bounce in and out of Xen so much.  Remains to be seen whether this makes much 
> diffecence to overall performance but it seems somehow civilised ;-)
For sure, there are a lot of possible minor optimization points...

Tristan.

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