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Re: [PATCH for-4.17 2/2] SUPPORT.md: Mark static heap feature as supported
- To: Julien Grall <julien@xxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Fri, 14 Oct 2022 09:39:58 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Henry Wang <Henry.Wang@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Wei Chen <Wei.Chen@xxxxxxx>
- Delivery-date: Fri, 14 Oct 2022 09:40:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH for-4.17 2/2] SUPPORT.md: Mark static heap feature as supported
Hi,
> On 14 Oct 2022, at 09:35, Julien Grall <julien@xxxxxxx> wrote:
>
> Hi Stefano,
>
> On 14/10/2022 00:55, Stefano Stabellini wrote:
>> On Thu, 13 Oct 2022, Henry Wang wrote:
>>> With the P2M pages pool bounding the domain memory runtime allocation
>>> and the documented minimal size requirement of the static heap, it is
>>> safe to mark static heap feature as supported.
>> Usually we wait at least one release cycle before marking a feature as
>> supported. However, I can see that this case is a bit different because
>> effectively static heap memory is a safety/security feature.
>
> Even with patch #1 merged, we are still missing some information on how to
> size the heap. But see below...
>
>> Julien, Bertrand, I'll let you know decide on this one
>
> It doesn't seem to make sense to security support the static heap when
> allocating statically memory for domains are still in tech preview.
>
> That's because if you want to have your system security supported, then you
> will need all the allocations to come from the heap. At which point,
> restricting the heap seems pointless.
>
> So I think it would be better to wait until the static memory is fully
> supported.
>
I think this should stay a tech preview in 4.17.
Cheers
Bertrand
> Cheers,
>
> --
> Julien Grall
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