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Re: [PATCH v1 11/13] xen/arm: store shm-info for deferred foreign memory map

To: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>
From: Julien Grall <julien@xxxxxxx>
Date: Sat, 9 Apr 2022 10:14:50 +0100
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, nd <nd@xxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
Delivery-date: Sat, 09 Apr 2022 09:14:59 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Hi Stefano,

On 08/04/2022 23:46, Stefano Stabellini wrote:

So I don't think that when the owner dies, we need to actively go and
unmap the pages at the borrowers. Also because it would likely cause
them to crash: from their point of view the memory was there, and
suddenly it is not there anymore.

I agree with that. Also, the code is likely going to be quite complexbecause there are a lot of things that can go wrong (e.g. the domain IDhas been re-used). I will comment there directly.


Cheers,

--
Julien Grall

References:
- RE: [PATCH v1 11/13] xen/arm: store shm-info for deferred foreign memory map
  - From: Stefano Stabellini

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