linux-kernel - [PATCH v10 07/12] iommu/amd: Do sanity check for address translation and irq remap of old dev table entry

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Message-Id: <1502267624-7066-8-git-send-email-bhe@redhat.com>
Date:   Wed,  9 Aug 2017 16:33:39 +0800
From:   Baoquan He <bhe@...hat.com>
To:     jroedel@...e.de
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v10 07/12] iommu/amd: Do sanity check for address translation and irq remap of old dev table entry

Firstly split the dev table entry copy into address translation part
and irq remapping part. Because these two parts could be enabled
independently.

Secondly do sanity check for address translation and irq remap of old
dev table entry separately.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 drivers/iommu/amd_iommu.c       |  5 -----
 drivers/iommu/amd_iommu_init.c  | 23 ++++++++++++++++++++---
 drivers/iommu/amd_iommu_types.h |  8 ++++++++
 3 files changed, 28 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b22b58b33400..dab901b4f0f9 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3776,11 +3776,6 @@ EXPORT_SYMBOL(amd_iommu_device_info);
 
 static struct irq_chip amd_ir_chip;
 
-#define DTE_IRQ_PHYS_ADDR_MASK	(((1ULL << 45)-1) << 6)
-#define DTE_IRQ_REMAP_INTCTL    (2ULL << 60)
-#define DTE_IRQ_TABLE_LEN       (8ULL << 1)
-#define DTE_IRQ_REMAP_ENABLE    1ULL
-
 static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
 {
 	u64 dte;
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 959c25d997e1..d08ad74b0928 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -852,12 +852,12 @@ static int get_dev_entry_bit(u16 devid, u8 bit)
 
 static bool copy_device_table(void)
 {
+	u64 int_ctl, int_tab_len, entry, last_entry = 0;
 	struct dev_table_entry *old_devtb = NULL;
 	u32 lo, hi, devid, old_devtb_size;
 	phys_addr_t old_devtb_phys;
-	u64 entry, last_entry = 0;
 	struct amd_iommu *iommu;
-	u16 dom_id, dte_v;
+	u16 dom_id, dte_v, irq_v;
 	gfp_t gfp_flag;
 
 	if (!amd_iommu_pre_enabled)
@@ -901,8 +901,25 @@ static bool copy_device_table(void)
 		old_dev_tbl_cpy[devid] = old_devtb[devid];
 		dom_id = old_devtb[devid].data[1] & DEV_DOMID_MASK;
 		dte_v = old_devtb[devid].data[0] & DTE_FLAG_V;
-		if (dte_v && dom_id)
+
+		if (dte_v && dom_id) {
+			old_dev_tbl_cpy[devid].data[0] = old_devtb[devid].data[0];
+			old_dev_tbl_cpy[devid].data[1] = old_devtb[devid].data[1];
 			__set_bit(dom_id, amd_iommu_pd_alloc_bitmap);
+		}
+
+		irq_v = old_devtb[devid].data[2] & DTE_IRQ_REMAP_ENABLE;
+		int_ctl = old_devtb[devid].data[2] & DTE_IRQ_REMAP_INTCTL_MASK;
+		int_tab_len = old_devtb[devid].data[2] & DTE_IRQ_TABLE_LEN_MASK;
+		if (irq_v && (int_ctl || int_tab_len)) {
+			if ((int_ctl != DTE_IRQ_REMAP_INTCTL) ||
+			    (int_tab_len != DTE_IRQ_TABLE_LEN)) {
+				pr_err("Wrong old irq remapping flag: %#x\n", devid);
+				return false;
+			}
+
+		        old_dev_tbl_cpy[devid].data[2] = old_devtb[devid].data[2];
+		}
 	}
 	memunmap(old_devtb);
 
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index a7f6cf8c841e..f0979183ec9b 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -250,6 +250,14 @@
 
 #define GA_GUEST_NR		0x1
 
+/* Bit value definition for dte irq remapping fields*/
+#define DTE_IRQ_PHYS_ADDR_MASK	(((1ULL << 45)-1) << 6)
+#define DTE_IRQ_REMAP_INTCTL_MASK	(0x3ULL << 60)
+#define DTE_IRQ_TABLE_LEN_MASK	(0xfULL << 1)
+#define DTE_IRQ_REMAP_INTCTL    (2ULL << 60)
+#define DTE_IRQ_TABLE_LEN       (8ULL << 1)
+#define DTE_IRQ_REMAP_ENABLE    1ULL
+
 #define PAGE_MODE_NONE    0x00
 #define PAGE_MODE_1_LEVEL 0x01
 #define PAGE_MODE_2_LEVEL 0x02
-- 
2.5.5