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Re: [PATCH v2] x86: constrain sub-page access length in mmio_ro_emulated_write()
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Fri, 25 Apr 2025 13:32:31 -0400
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 25 Apr 2025 17:33:15 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2025-04-25 10:57, Jan Beulich wrote:
Without doing so we could trigger the ASSERT_UNREACHABLE() in
subpage_mmio_write_emulate(). A comment there actually says this
validation would already have been done ...
Fixes: 8847d6e23f97 ("x86/mm: add API for marking only part of a MMIO page read
only")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
Thanks,
Jason
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