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From: Jan Beulich <jbeulich@suse.com>
To: Julien Grall <julien@xen.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Volodymyr Babchuk <volodymyr_babchuk@epam.com>,
	"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Subject: Re: [PATCH] Arm: relax iomem_access_permitted() check
Date: Thu, 19 Aug 2021 10:11:10 +0200	[thread overview]
Message-ID: <5aa93b5a-3c73-a662-63db-5babc69078c2@suse.com> (raw)
In-Reply-To: <adfdc3f6-5801-8387-6400-393f2536c6cd@xen.org>

On 18.08.2021 19:44, Julien Grall wrote:
> On 18/08/2021 08:52, Jan Beulich wrote:
>> Ranges checked by iomem_access_permitted() are inclusive; to permit a
>> mapping there's no need for access to also have been granted for the
>> subsequent page.
> 
> Good catch! OOI, how did you find it?

In the course of my large-IOMMU-mappings work I ended up grep-ing for
all uses of the function, and this one - while unrelated to that work -
caught my eye.

>> Fixes: 80f9c3167084 ("xen/arm: acpi: Map MMIO on fault in stage-2 page table for the hardware domain")
>> Signed-off-by: Jan Beulich <jbeulich@suse.com>
> 
> Reviewed-by: Julien Grall <jgrall@amazon.com>

Thanks.

Jan



      reply	other threads:[~2021-08-19  8:11 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18  7:52 [PATCH] Arm: relax iomem_access_permitted() check Jan Beulich
2021-08-18 17:44 ` Julien Grall
2021-08-19  8:11   ` Jan Beulich [this message]

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