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Re: [PATCH] arm/its: Decode BASER cacheability field before comparing
- To: Mykola Kvach <xakep.amatop@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 10 Apr 2026 12:45:45 +0200
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- Cc: Mykola Kvach <mykola_kvach@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Mykyta Poturai <mykyta_poturai@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 10 Apr 2026 10:45:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.04.2026 09:08, Mykola Kvach wrote:
> On Fri, Apr 10, 2026 at 9:40 AM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>> On 10.04.2026 08:09, Mykola Kvach wrote:
>>> --- a/xen/arch/arm/gic-v3-its.c
>>> +++ b/xen/arch/arm/gic-v3-its.c
>>> @@ -496,7 +496,8 @@ retry:
>>> }
>>> attr = regc & BASER_ATTR_MASK;
>>> }
>>> - if ( (regc & GITS_BASER_INNER_CACHEABILITY_MASK) <= GIC_BASER_CACHE_nC
>>> )
>>> + if ( ((regc & GITS_BASER_INNER_CACHEABILITY_MASK) >>
>>> + GITS_BASER_INNER_CACHEABILITY_SHIFT) <= GIC_BASER_CACHE_nC )
>>
>> Are you aware of MASK_EXTR()? This is one of the cases that we have it for.
>> Really all *_SHIFT constants should be purged, as they can be calculated
>> from their *_MASK counterparts (leveraging MASK_{EXTR,INSR}() to keep the
>> code readable).
>
> I wasn't aware of this macro, thanks. I will take a look.
>
>> Further, doesn't gicv3_lpi_set_proptable() have the same issue with
>> GICR_PROPBASER_INNER_CACHEABILITY_MASK?
>
> Fortunately, GIC_BASER_NonShareable is equal to zero, so the condition
> there is not affected.
I fear I don't follow. In
if ( (reg & GICR_PROPBASER_INNER_CACHEABILITY_MASK) <= GIC_BASER_CACHE_nC )
where does GIC_BASER_NonShareable come into play?
Jan
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