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Re: [PATCH v3 10/12] xen/arm: remove shm holes from extended regions
- To: Luca Fancellu <luca.fancellu@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Michal Orzel <michal.orzel@xxxxxxx>
- Date: Thu, 18 Apr 2024 14:47:06 +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: Thu, 18 Apr 2024 12:47:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18/04/2024 09:36, Luca Fancellu wrote:
>
>
> From: Penny Zheng <Penny.Zheng@xxxxxxx>
>
> Static shared memory acts as reserved memory in guest, so it shall be
> excluded from extended regions.
>
> Extended regions are taken care of under three different scenarios:
> normal DomU, direct-map domain with iommu on, and direct-map domain
> with iommu off.
>
> For normal DomU, we create a new function "remove_shm_holes_for_domU",
> to firstly transfer original outputs into the format of
> "struct rangeset", then use "remove_shm_from_rangeset" to remove static
> shm from them.
>
> For direct-map domain with iommu on, after we get guest shm info from "kinfo",
> we use "remove_shm_from_rangeset" to remove static shm.
>
> For direct-map domain with iommu off, as static shm has already been taken
> care of through find_unallocated_memory, we do nothing.
>
> 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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