linux-kernel - Re: [PATCH v3 1/3] uapi/linux/vfio:Add VFIO_DMA_MAP_FLAG

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Message-ID: <20250121140553.GP674319@ziepe.ca>
Date: Tue, 21 Jan 2025 10:05:53 -0400
From: Jason Gunthorpe <jgg@...pe.ca>
To: Wencheng Yang <east.moutain.yang@...il.com>
Cc: alex.williamson@...hat.com, iommu@...ts.linux.dev, joro@...tes.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	robin.murphy@....com, suravee.suthikulpanit@....com,
	will@...nel.org
Subject: Re: [PATCH v3 1/3] uapi/linux/vfio:Add VFIO_DMA_MAP_FLAG_MMIO flag

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