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Re: [PATCH v3 3/7] xen/p2m: put reference for level 2 superpage
- To: Luca Fancellu <luca.fancellu@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Wed, 22 May 2024 15:16:37 +0200
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- Cc: Penny Zheng <Penny.Zheng@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Wed, 22 May 2024 13:16:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Luca,
On 22/05/2024 09:51, Luca Fancellu wrote:
>
>
> From: Penny Zheng <Penny.Zheng@xxxxxxx>
>
> We are doing foreign memory mapping for static shared memory, and
> there is a great possibility that it could be super mapped.
> But today, p2m_put_l3_page could not handle superpages.
>
> This commits implements a new function p2m_put_l2_superpage to handle
> 2MB superpages, specifically for helping put extra references for
> foreign superpages.
>
> Modify relinquish_p2m_mapping as well to take into account preemption
> when type is foreign memory and order is above 9 (2MB).
>
> Currently 1GB superpages are not handled because Xen is not preemptible
> and therefore some work is needed to handle such superpages, for which
> at some point Xen might end up freeing memory and therefore for such a
> big mapping it could end up in a very long operation.
>
> Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
> Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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