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Re: [Xen-devel] Ping: [PATCH v2] AMD/IOMMU: fix off-by-one in amd_iommu_get_paging_mode() callers
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 13 Mar 2020 14:14:23 +0000
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- Delivery-date: Fri, 13 Mar 2020 14:14:29 +0000
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On 13/03/2020 11:27, Jan Beulich wrote:
> On 03.03.2020 12:02, Jan Beulich wrote:
>> amd_iommu_get_paging_mode() expects a count, not a "maximum possible"
>> value. Prior to b4f042236ae0 dropping the reference, the use of our mis-
>> named "max_page" in amd_iommu_domain_init() may have lead to such a
>> misunderstanding. In an attempt to avoid such confusion in the future,
>> rename the function's parameter and - while at it - convert it to an
>> inline function.
>>
>> Also replace a literal 4 by an expression tying it to a wider use
>> constant, just like amd_iommu_quarantine_init() does.
>>
>> Fixes: ea38867831da ("x86 / iommu: set up a scratch page in the quarantine
>> domain")
>> Fixes: b4f042236ae0 ("AMD/IOMMU: Cease using a dynamic height for the IOMMU
>> pagetables")
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>> ---
>> v2: Convert amd_iommu_get_paging_mode() itself to inline function,
>> changing itss parameter's name.
> Ping? Anything else needed here, beyond addressing your v1 comments?
Sorry - fell through the cracks.
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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