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Re: [PATCH] x86/ioapic: Check 1k alignment for IO-APIC physical addresses
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 20 Nov 2023 16:09:04 +0000
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- Cc: Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 20 Nov 2023 16:09:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20/11/2023 4:06 pm, Jan Beulich wrote:
> On 20.11.2023 16:10, Andrew Cooper wrote:
>> The MP spec requires a minimum of 1k alignment. So too does Xen's use of a
>> single fixmap page to map the IO-APIC.
>>
>> Reject out-of-spec values so we don't end up in a position where a bad
>> firmware value causes Xen to use the wrong mapping.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> I'm curious though: Was this observed in practice?
No. I had some prototype cleanup which collided with MISRA, and I
realised I hadn't posted this part of the series.
The other part of the cleanup still has work to do, and I don't have
time to unpick it right now.
~Andrew
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