Re: [Xen-devel] [PATCH v7 1/4] xen/arm: p2m: Clean cache PT when the IOMMU doesn't support coherent walk

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 05/15/2014 05:04 PM, Jan Beulich wrote:
>>>> On 15.05.14 at 16:16, <julien.grall@xxxxxxxxxx> wrote:
>> Some IOMMU don't suppport coherent PT walk. When the p2m is shared with
>> the CPU, Xen has to make sure the PT changes have reached the memory.
>>
>> Introduce new IOMMU function that will check if the IOMMU feature is enabled
>> for a specified domain.
>>
>> On ARM, the platform can contain multiple IOMMUs. Each of them may not
>> have the same set of feature. The domain parameter will be used to get the
>> set of features for IOMMUs used by this domain.
>>
>> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> 
> IOMMU part:
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

Thanks. Ian, will you take care to remove the "," in this patch? It will
avoid me to resend the whole series for this small change.

> with one final nit:
> 
>> --- a/xen/include/xen/iommu.h
>> +++ b/xen/include/xen/iommu.h
>> @@ -67,6 +67,15 @@ int iommu_map_page(struct domain *d, unsigned long gfn, 
>> unsigned long mfn,
>>                     unsigned int flags);
>>  int iommu_unmap_page(struct domain *d, unsigned long gfn);
>>  
>> +enum iommu_feature
>> +{
>> +    IOMMU_FEAT_COHERENT_WALK,
>> +    IOMMU_FEAT_count,

Regards,

-- 
Julien Grall

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