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Re: [PATCH] tools/libxenguest: Fix migration's debug option
- To: Olaf Hering <olaf@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 5 Jul 2021 11:31:09 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 05 Jul 2021 09:31:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05.07.2021 11:25, Olaf Hering wrote:
> Am Mon, 5 Jul 2021 11:19:59 +0200
> schrieb Jan Beulich <jbeulich@xxxxxxxx>:
>
>> "The interface" being which one? The tool stack can map the guest's
>> grant table, so it is in the position to find out about all grants
>> without further hypervisor help.
>
> The interface means the code behind verify_frames.
>
> If there are indeed ways to query which pages belong to grants, how would the
> toolstack need to do that?
Map the grant table of the guest and walk it, recording any MFN for
which at least one valid r/w grant exists.
Jan
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