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Re: [PATCH v5 2/9] xen/arm/static-shmem: Static-shmem should be direct-mapped for direct-mapped domains
- To: Stefano Stabellini <stefano.stabellini@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Thu, 6 Feb 2025 09:04:16 +0100
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- Cc: sstabellini@xxxxxxxxxx, bertrand.marquis@xxxxxxx, julien@xxxxxxx, Volodymyr_Babchuk@xxxxxxxx, Henry Wang <xin.wang2@xxxxxxx>
- Delivery-date: Thu, 06 Feb 2025 08:04:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06/02/2025 02:08, Stefano Stabellini wrote:
> From: Henry Wang <xin.wang2@xxxxxxx>
>
> Currently, users are allowed to map static shared memory in a
> non-direct-mapped way for direct-mapped domains. This can lead to
> clashing of guest memory spaces. Also, the current extended region
> finding logic only removes the host physical addresses of the
> static shared memory areas for direct-mapped domains, which may be
> inconsistent with the guest memory map if users map the static
> shared memory in a non-direct-mapped way. This will lead to incorrect
> extended region calculation results.
>
> To make things easier, add restriction that static shared memory
> should also be direct-mapped for direct-mapped domains. Check the
> host physical address to be matched with guest physical address when
> parsing the device tree. Document this restriction in the doc.
>
> Signed-off-by: Henry Wang <xin.wang2@xxxxxxx>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
> Acked-by: Michal Orzel <michal.orzel@xxxxxxx>
This patch has already been committed (see 0a0f30c1b55e) and later on fixed
(see 988f1c7e1f40).
DO NOT COMMIT.
~Michal
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