RE: [PATCH v2 00/11] iommufd: Add nesting infrastructure

Tian, Kevin
2023-06-27T06:02:22Z

> From: Nicolin Chen <nicolinc@nvidia.com>
> Sent: Tuesday, June 27, 2023 1:29 AM
>
> > I'm not sure whether the MSI region needs a special MSI type or
> > just a general RESV_DIRECT type for 1:1 mapping, though.
>
> I don't quite get this part. Isn't MSI having IOMMU_RESV_MSI
> and IOMMU_RESV_SW_MSI? Or does it juset mean we should report
> the iommu_resv_type along with reserved regions in new ioctl?
>

Currently those are iommu internal types. When defining the new
ioctl we need think about what are necessary presenting to the user.

Probably just a list of reserved regions plus a flag to mark which
one is SW_MSI? Except SW_MSI all other reserved region types
just need the user to reserve them w/o knowing more detail.