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Re: obtain a list of granttable PFNs from toolstack
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Olaf Hering <olaf@xxxxxxxxx>
- Date: Wed, 28 Apr 2021 12:17:01 +0200
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- Delivery-date: Wed, 28 Apr 2021 10:17:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Am Wed, 28 Apr 2021 11:49:59 +0200
schrieb Jan Beulich <jbeulich@xxxxxxxx>:
> On 28.04.2021 09:50, Olaf Hering wrote:
> > Is there an API to get a list of PFNs which are currently being active in
> > the grant table for a given domid?
> Do you really mean PFNs?
The save/restore code uses the term "pfn" to refer to page indices from the
domU point of view. Since I usually just follow the HVM code paths, the term
might indeed be incorrect for PV.
> Also, what do you mean by "active in the grant table"?
I'm not familiar with grants. My guess is, a domU pro-actively shares some of
its pages with someone else. These shared pages have to be tracked somewhere,
and I guess Xen has to establish proper access permissions for such pages. I
guess the "grant table" is the place where things are collected.
Looking through xen/grant_table.h, I see no API. But that might be the wrong
place anyway.
Olaf
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