Re: [PATCH v3 1/3] uapi/linux/vfio:Add VFIO_DMA_MAP_FLAG_MMIO flag

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Subject: Re: [PATCH v3 1/3] uapi/linux/vfio:Add VFIO_DMA_MAP_FLAG_MMIO flag
From: Jason Gunthorpe <jgg@xxxxxxxx>
Date: Tue, 21 Jan 2025 10:05:53 -0400
Cc: alex.williamson@xxxxxxxxxx, iommu@xxxxxxxxxxxxxxx, joro@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, robin.murphy@xxxxxxx, suravee.suthikulpanit@xxxxxxx, will@xxxxxxxxxx
In-reply-to: <20250121112836.525046-1-east.moutain.yang@gmail.com>
References: <CALrP2iW11zHNVWCz3JXjPHxyJ=j3FsVdTGetMoxQvmNZo2X_yQ@mail.gmail.com> <20250121112836.525046-1-east.moutain.yang@gmail.com>

On Tue, Jan 21, 2025 at 07:28:34PM +0800, Wencheng Yang wrote:
> The flag will be used by VFIO to map DMA for device MMIO on IOMMU page table.

Definitely not, the kernel needs to know and protect the memory type
itself. Userspace cannot be allowed to override things

Jason

References:
- Re: [PATCH v2] drviers/iommu/amd: support P2P access through IOMMU when SME is enabled
  - From: Wencheng Yang
- [PATCH v3 1/3] uapi/linux/vfio:Add VFIO_DMA_MAP_FLAG_MMIO flag
  - From: Wencheng Yang

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