linux-kernel - [Patch v4 9/9] iommu/amd: Check the validation of irq table and domain id

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Message-Id: <1464157735-8865-10-git-send-email-bhe@redhat.com>
Date:	Wed, 25 May 2016 14:28:55 +0800
From:	Baoquan He <bhe@...hat.com>
To:	joro@...tes.org
Cc:	iommu@...ts.linux-foundation.org, vincent.wan@....com,
	xlpang@...hat.com, dyoung@...hat.com, linux-kernel@...r.kernel.org,
	Baoquan HE <bhe@...hat.com>, Baoquan He <bhe@...hat.com>
Subject: [Patch v4 9/9] iommu/amd: Check the validation of irq table and domain id

From: Baoquan HE <bhe@...p-129-10.nay.redhat.com>

If not valid just skip reserving the old domain id.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 drivers/iommu/amd_iommu.c       | 4 ----
 drivers/iommu/amd_iommu_init.c  | 5 +++--
 drivers/iommu/amd_iommu_types.h | 5 +++++
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index f3bd7fd..40c4a05 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3697,10 +3697,6 @@ struct amd_ir_data {
 
 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)
 {
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 47e5972..263704a 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -670,7 +670,7 @@ static int copy_dev_tables(void)
 	u32 lo, hi, devid;
 	phys_addr_t old_devtb_phys;
 	struct dev_table_entry *old_devtb;
-	u16 dom_id, dte_v;
+	u16 dom_id, dte_v, irq_v;
 	struct amd_iommu *iommu;
 	static int copied;
 
@@ -692,7 +692,8 @@ static int copy_dev_tables(void)
                         amd_iommu_dev_table[devid] = old_devtb[devid];
                         dom_id = amd_iommu_dev_table[devid].data[1] & DEV_DOMID_MASK;
 			dte_v = amd_iommu_dev_table[devid].data[0] & DTE_FLAG_V;
-			if (!dte_v)
+			irq_v = amd_iommu_dev_table[devid].data[2] & DTE_IRQ_REMAP_ENABLE;
+			if (!dte_v || !irq_v || !dom_id)
 				continue;
                         __set_bit(dom_id, amd_iommu_pd_alloc_bitmap);
                 }
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 34acd73..08340f5 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -224,6 +224,11 @@
 
 #define PPR_REQ_FAULT		0x01
 
+#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
+
 #define PAGE_MODE_NONE    0x00
 #define PAGE_MODE_1_LEVEL 0x01
 #define PAGE_MODE_2_LEVEL 0x02
-- 
2.5.5