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

From: Jason Gunthorpe
Date: Tue Jan 21 2025 - 09:06:06 EST

Next message: Denis Arefev: "[PATCH 5.10] net: fec: remove .ndo_poll_controller to avoid deadlocks"
Previous message: Ilpo Järvinen: "Re: [PATCH RESEND v5 2/3] platform: arm64: add Huawei Matebook E Go EC driver"
In reply to: Wencheng Yang: "[PATCH v3 3/3] iommu/amd:Clear encryption bit if the mapping is for device MMIO"
Next in thread: Alex Williamson: "Re: [PATCH v2] drviers/iommu/amd: support P2P access through IOMMU when SME is enabled"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

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

Next message: Denis Arefev: "[PATCH 5.10] net: fec: remove .ndo_poll_controller to avoid deadlocks"
Previous message: Ilpo Järvinen: "Re: [PATCH RESEND v5 2/3] platform: arm64: add Huawei Matebook E Go EC driver"
In reply to: Wencheng Yang: "[PATCH v3 3/3] iommu/amd:Clear encryption bit if the mapping is for device MMIO"
Next in thread: Alex Williamson: "Re: [PATCH v2] drviers/iommu/amd: support P2P access through IOMMU when SME is enabled"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]