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Message-ID: <20240112000646.98001-6-suravee.suthikulpanit@amd.com>
Date: Thu, 11 Jan 2024 18:06:44 -0600
From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To: <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<joro@...tes.org>, <jgg@...dia.com>
CC: <yi.l.liu@...el.com>, <kevin.tian@...el.com>, <nicolinc@...dia.com>,
<eric.auger@...hat.com>, <vasant.hegde@....com>, <jon.grimm@....com>,
<santosh.shukla@....com>, <Dhaval.Giani@....com>, <pandoh@...gle.com>,
<loganodell@...gle.com>, Suravee Suthikulpanit
<suravee.suthikulpanit@....com>
Subject: [RFCv2 PATCH 5/7] iommufd: Introduce data struct for AMD nested domain allocation
Introduce IOMMU_HWPT_DATA_AMD_V2 data type for AMD IOMMU v2 page table,
which is used for stage-1 in nested translation. The data structure
contains information necessary for setting up the AMD HW-vIOMMU support.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
include/uapi/linux/iommufd.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 9901b9f4abe2..b28ec5947571 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -389,14 +389,39 @@ struct iommu_hwpt_vtd_s1 {
__u32 __reserved;
};
+/**
+ * struct iommu_hwpt_amd_v2 - AMD IOMMU specific user-managed
+ * v2 I/O page table data
+ * @gcr3: GCR3 guest physical ddress
+ * @flags.glx: GCR3 table levels
+ * @flags.giov: GIOV mode
+ * @flags.guest_paging_mode: Guest v2 page table paging mode
+ * @flags.reserved : Must be 0
+ * @gdom_id: Guest domain ID
+ * @__reserved: Must be 0
+ */
+struct iommu_hwpt_amd_v2 {
+ __aligned_u64 gcr3;
+ struct {
+ __aligned_u64 glx : 1,
+ giov : 1,
+ guest_paging_mode : 2,
+ reserved : 60;
+ } flags;
+ __u32 gdom_id;
+ __u32 __reserved;
+};
+
/**
* enum iommu_hwpt_data_type - IOMMU HWPT Data Type
* @IOMMU_HWPT_DATA_NONE: no data
* @IOMMU_HWPT_DATA_VTD_S1: Intel VT-d stage-1 page table
+ * @IOMMU_HWPT_DATA_AMD_V2: AMD IOMMUv2 page table
*/
enum iommu_hwpt_data_type {
IOMMU_HWPT_DATA_NONE,
IOMMU_HWPT_DATA_VTD_S1,
+ IOMMU_HWPT_DATA_AMD_V2,
};
/**
--
2.34.1
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