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Re: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>
  • Date: Mon, 6 Feb 2006 12:01:57 -0800
  • Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 06 Feb 2006 20:12:49 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcYrACLAC44DyOH2SMyhzX4zn+iQvQAVcqRQ
  • Thread-topic: Re: [Xen-devel] [BUNDLE] Testing a simpler inter-domain transport

> Thanks, just fiddling.  It'll be interesting to see what 
> changes the PPC
> guys will need for this.
> Cheers!
> Rusty.

(I'm sure you meant PPC *and* ia64 ;*)

On just a quick skim, one thing to note:

IIRC from the summit, domain0 and driver domains for
neither PPC nor ia64 will have a p2m lookup table so
a p2m translation will require a hypercall. So
while virt_to_machine is cheap for domains on x86,
it is not on PPC and ia64.  If HYPERVISOR_share can
take physical addresses instead of machine addresses
(with Xen doing the phys_to_machine part of the
translation), I think the code would work better
for PPC and ia64, as well as better hide the
virtual->physical->machine memory abstraction.


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