Re: [Xen-devel] MULTI_mmu_update, HYPERVISOR_mmu_update and pte

To:	Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject:	Re: [Xen-devel] MULTI_mmu_update, HYPERVISOR_mmu_update and pte entry
From:	Christopher Benninger <chrisbenninger@xxxxxxxxx>
Date:	Thu, 19 May 2011 10:37:48 -0700
Cc:	xen-devel@xxxxxxxxxxxxxxxxxxx, Wei Liu <liuw@xxxxxxxxx>
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Interesting,

Are you talking about when DomU calls setpte?

Chris Benninger

University of Victoria, Computer Science
cbenning@xxxxxxxxxx
http://benninger.ca

On Wed, May 18, 2011 at 1:09 AM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

On Wed, 2011-05-18 at 13:47 +0800, Wei Liu wrote:
> On Wed, May 18, 2011 at 1:25 PM, Christopher Benninger
> <chrisbenninger@xxxxxxxxx> wrote:
> > Hi Jeremy,
> > I am definitely doing something weird, but on purpose. I am trying to
> > determine which process specifically owns the pte in question. I have a domU
> > module which I can ask for information, I just dont know how to get the ptr
> > provided, into a useful context I can send it.
>
> Most pte updates belong to current process. Maybe you can use CR3 to
> determine to which page table a specified pte belongs. But it may be
> hard to determine the actual task_struct IMHO.

If you can record it at the time of the setpte, its easy: "current" is
always the current task.

J

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Re: [Xen-devel] MULTI_mmu_update, HYPERVISOR_mmu_update and pte entry