Re: [Xen-devel] [PATCH v2 2/5] IOMMU: iommu_intpost is x86/HVM-only

[Jan Beulich <jbeulich@xxxxxxxx>]

On 10.03.2020 02:13, Tian, Kevin wrote:
>> From: Jan Beulich <jbeulich@xxxxxxxx>
>> Sent: Monday, March 9, 2020 6:43 PM
>>
>> --- a/xen/drivers/passthrough/x86/iommu.c
>> +++ b/xen/drivers/passthrough/x86/iommu.c
>> @@ -29,6 +29,16 @@ struct iommu_ops __read_mostly iommu_ops
>>
>>  enum iommu_intremap __read_mostly iommu_intremap =
>> iommu_intremap_full;
>>
>> +#ifndef iommu_intpost
>> +/*
>> + * In the current implementation of VT-d posted interrupts, in some
>> extreme
>> + * cases, the per cpu list which saves the blocked vCPU will be very long,
>> + * and this will affect the interrupt latency, so let this feature off by
>> + * default until we find a good solution to resolve it.
>> + */
> 
> Is above comment really VT-d specific? may take this chance to refine
> it together.

At the moment it is, as we still don't have any AMD side counterpart
code.

Jan

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