linux-kernel - [PATCH v2 3/5] iommu/vt-d: Extend dmar

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Message-Id: <20230309082207.612346-4-yi.l.liu@intel.com>
Date:   Thu,  9 Mar 2023 00:22:05 -0800
From:   Yi Liu <yi.l.liu@...el.com>
To:     joro@...tes.org, alex.williamson@...hat.com, jgg@...dia.com,
        kevin.tian@...el.com, robin.murphy@....com,
        baolu.lu@...ux.intel.com
Cc:     cohuck@...hat.com, eric.auger@...hat.com, nicolinc@...dia.com,
        kvm@...r.kernel.org, mjrosato@...ux.ibm.com,
        chao.p.peng@...ux.intel.com, yi.l.liu@...el.com,
        yi.y.sun@...ux.intel.com, peterx@...hat.com, jasowang@...hat.com,
        shameerali.kolothum.thodi@...wei.com, lulu@...hat.com,
        suravee.suthikulpanit@....com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v2 3/5] iommu/vt-d: Extend dmar_domain to support nested domain

From: Lu Baolu <baolu.lu@...ux.intel.com>

The nested domain fields are exclusive to those that used for a DMA
remapping domain. Use union to avoid memory waste.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Yi Liu <yi.l.liu@...el.com>
---
 drivers/iommu/intel/iommu.h | 35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 9871de2170eb..9446e17dd202 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -599,15 +599,38 @@ struct dmar_domain {
 	spinlock_t lock;		/* Protect device tracking lists */
 	struct list_head devices;	/* all devices' list */
 
-	struct dma_pte	*pgd;		/* virtual address */
-	int		gaw;		/* max guest address width */
-
-	/* adjusted guest address width, 0 is level 2 30-bit */
-	int		agaw;
 	int		iommu_superpage;/* Level of superpages supported:
 					   0 == 4KiB (no superpages), 1 == 2MiB,
 					   2 == 1GiB, 3 == 512GiB, 4 == 1TiB */
-	u64		max_addr;	/* maximum mapped address */
+	union {
+		/* DMA remapping domain */
+		struct {
+			/* virtual address */
+			struct dma_pte	*pgd;
+			/* max guest address width */
+			int		gaw;
+			/*
+			 * adjusted guest address width:
+			 *   0: level 2 30-bit
+			 *   1: level 3 39-bit
+			 *   2: level 4 48-bit
+			 *   3: level 5 57-bit
+			 */
+			int		agaw;
+			/* maximum mapped address */
+			u64		max_addr;
+		};
+
+		/* Nested user domain */
+		struct {
+			/* 2-level page table the user domain nested */
+			struct dmar_domain *s2_domain;
+			/* user page table pointer (in GPA) */
+			unsigned long s1_pgtbl;
+			/* page table attributes */
+			struct iommu_hwpt_intel_vtd s1_cfg;
+		};
+	};
 
 	struct iommu_domain domain;	/* generic domain data structure for
 					   iommu core */
-- 
2.34.1