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| author |   Robin Murphy <robin.murphy@arm.com> | 2022-04-25 13:42:03 +0100 |
|---|---|---|
| committer |   Joerg Roedel <jroedel@suse.de> | 2022-04-28 10:30:25 +0200 |
| commit | d0be55fbeb6ac694d15af5d1aad19cdec8cd64e5 (patch) | |
| tree | 24b64d583945f54de090dc464a7e8ac23a23ce1b /include/linux/iommu.h | |
| parent | iommu: Introduce device_iommu_capable() (diff) | |
| download | wireguard-linux-d0be55fbeb6ac694d15af5d1aad19cdec8cd64e5.tar.xz wireguard-linux-d0be55fbeb6ac694d15af5d1aad19cdec8cd64e5.zip | |
iommu: Add capability for pre-boot DMA protection
VT-d's dmar_platform_optin() actually represents a combination of
properties fairly well standardised by Microsoft as "Pre-boot DMA
Protection" and "Kernel DMA Protection"[1]. As such, we can provide
interested consumers with an abstracted capability rather than
driver-specific interfaces that won't scale. We name it for the former
aspect since that's what external callers are most likely to be
interested in; the latter is for the IOMMU layer to handle itself.
[1] https://docs.microsoft.com/en-us/windows-hardware/design/device-experiences/oem-kernel-dma-protection
Suggested-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/d6218dff2702472da80db6aec2c9589010684551.1650878781.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index e26cf84e5d82..4123693ae319 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -107,6 +107,8 @@ enum iommu_cap { transactions */ IOMMU_CAP_INTR_REMAP, /* IOMMU supports interrupt isolation */ IOMMU_CAP_NOEXEC, /* IOMMU_NOEXEC flag */ + IOMMU_CAP_PRE_BOOT_PROTECTION, /* Firmware says it used the IOMMU for + DMA protection and we should too */ }; /* These are the possible reserved region types */ |