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Re: [Xen-devel] Re: changeset 13403 ...


  • To: Keir Fraser <keir@xxxxxxxxxxxxx>, Gerd Hoffmann <kraxel@xxxxxxx>
  • From: Keir Fraser <keir@xxxxxxxxxxxxx>
  • Date: Mon, 29 Jan 2007 13:55:06 +0000
  • Cc: Xen devel list <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Mon, 29 Jan 2007 05:54:49 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdDrBsDWbrmpq+fEduROAAX8io7RQAAPm8r
  • Thread-topic: [Xen-devel] Re: changeset 13403 ...



On 29/1/07 13:48, "Keir Fraser" <keir@xxxxxxxxxxxxx> wrote:

> On 29/1/07 13:40, "Gerd Hoffmann" <kraxel@xxxxxxx> wrote:
> 
>> Just noticed that domU kexec doesn't work any more, changeset 13403 is
>> the culpit.  Hmm.  No, it isn't easy to work-around ...
>> 
>> cheers,
> 
> Two pagetable switches in a single multicall? First switch is to a pagetable
> which maps only the multicall structure. This small intermediate table has
> to be mapped read-only in the original pagetables and in the final
> pagetables, but it will only be a few pages of memory (4 in the worst case).

Oh, it'll need a hypercall transfer page too. And it's a mmuext_op list that
you need, not a multicall. The transfer page and mmuext_op list can be
placed in adjacent pages so that you don't need any more intermediate
pagetable pages.

 -- Keir


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