iommu/vt-d: Enable write protect propagation from guest

Write protect bit, when set, inhibits supervisor writes to the read-only pages. In guest supervisor shared virtual addressing (SVA), write-protect should be honored upon guest bind supervisor PASID request. This patch extends the VT-d portion of the IOMMU UAPI to include WP bit. WPE bit of the supervisor PASID entry will be set to match CPU CR0.WP bit.

Jacob Pan committed 5 years ago

Commit bb0f6151 parent f68c7f52 files · +5 −1Browse files

Showing the changes to include/uapi (1 of 2 files). Show all

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include/uapi/linux/iommu.h+2−1

@@ -288,7 +288,8 @@ struct iommu_gpasid_bind_data_vtd { · 287 unmodified lines
288	288	#define IOMMU_SVA_VTD_GPASID_PWT (1 << 3) /* page-level write through */
289	289	#define IOMMU_SVA_VTD_GPASID_EMTE (1 << 4) /* extended mem type enable */
290	290	#define IOMMU_SVA_VTD_GPASID_CD (1 << 5) /* PASID-level cache disable */
291		−#define IOMMU_SVA_VTD_GPASID_LAST (1 << 6)
	291	+#define IOMMU_SVA_VTD_GPASID_WPE (1 << 6) /* Write protect enable */
	292	+#define IOMMU_SVA_VTD_GPASID_LAST (1 << 7)
292	293	__u64 flags;
293	294	__u32 pat;
294	295	__u32 emt;