Re: [PATCH v5 4/5] iommu/hyperv: Add para-virtualized IOMMU support for Hyper-V guest

[Vasant Hegde]

On 9/30/2026 3:04 AM, Easwar Hariharan wrote:
> On 9/29/2026 14:25, Jacob Pan wrote:
>> Hi Jason,
>>
>> On Tue, 29 Sep 2026 17:04:47 -0300
>> Jason Gunthorpe <jgg@xxxxxxxxxx> wrote:
>>
>>>> +config HYPERV_PVIOMMU
>>>> +	bool "Microsoft Hyper-V para-virtualized IOMMU driver for
>>>> Linux guests"
>>>> +	depends on X86_64 && HYPERV
>>>> +	select IOMMU_API
>>>> +	select GENERIC_PT
>>>> +	select IOMMU_PT
>>>> +	select IOMMU_PT_X86_64
>>>> +	select IOMMU_IOVA  
>>>
>>> Should this be IOMMU_DMA ?
>>
>> I agree. I guess we should also delete "select IOMMU_API", since
>> IOMMU_DMA selects both.
>>
>> Noticed vt-d driver has the same option, maybe it should also
>> be changed. Baolu, is that due to historical reasons?
>>
>> config INTEL_IOMMU
>> 	bool "Support for Intel IOMMU using DMA Remapping Devices"
>> 	depends on PCI_MSI && ACPI && X86
>> 	select IOMMU_API
>> 	select GENERIC_PT
>> 	select IOMMU_PT
>> 	select IOMMU_PT_X86_64
>> 	select IOMMU_PT_VTDSS
>> 	select IOMMU_IOVA
> 
> FWIW, AMD also has the same...
> 
> config AMD_IOMMU
>         bool "AMD IOMMU support"
>         select SWIOTLB
>         select PCI_MSI
>         select PCI_ATS
>         select PCI_PRI
>         select PCI_PASID
>         select IRQ_MSI_LIB
>         select MMU_NOTIFIER
>         select IOMMU_API
>         select IOMMU_IOVA

We should replace IOMMU_API And IOMMU_IOVA with IOMMU_DMA.

also probably we should move PCI_ATS, PCI_PRI, PCI_PASID to CONFIG_IOMMU_SVA and
remove it from amd/intel driver code.

-Vasant