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From: Joerg Roedel <joro@8bytes.org>
To: iommu@lists.linux-foundation.org
Cc: linux-kernel@vger.kernel.org, Joerg Roedel <jroedel@suse.de>
Subject: [PATCH 7/9] iommu/vt-d: Access iomem correctly
Date: Thu, 13 Aug 2015 19:33:54 +0200	[thread overview]
Message-ID: <1439487236-14098-8-git-send-email-joro@8bytes.org> (raw)
In-Reply-To: <1439487236-14098-1-git-send-email-joro@8bytes.org>

From: Joerg Roedel <jroedel@suse.de>

This fixes wrong accesses to iomem introduced by the kdump
fixing code.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/iommu/intel-iommu.c         | 15 +++++++++------
 drivers/iommu/intel_irq_remapping.c |  4 ++--
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 93f16aa..a85077d 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2799,15 +2799,18 @@ static void intel_iommu_init_qi(struct intel_iommu *iommu)
 }
 
 static int copy_context_table(struct intel_iommu *iommu,
-			      struct root_entry *old_re,
+			      struct root_entry __iomem *old_re,
 			      struct context_entry **tbl,
 			      int bus, bool ext)
 {
-	struct context_entry *old_ce = NULL, *new_ce = NULL, ce;
 	int tbl_idx, pos = 0, idx, devfn, ret = 0, did;
+	struct context_entry __iomem *old_ce = NULL;
+	struct context_entry *new_ce = NULL, ce;
+	struct root_entry re;
 	phys_addr_t old_ce_phys;
 
 	tbl_idx = ext ? bus * 2 : bus;
+	memcpy_fromio(&re, old_re, sizeof(re));
 
 	for (devfn = 0; devfn < 256; devfn++) {
 		/* First calculate the correct index */
@@ -2827,9 +2830,9 @@ static int copy_context_table(struct intel_iommu *iommu,
 
 			ret = 0;
 			if (devfn < 0x80)
-				old_ce_phys = root_entry_lctp(old_re);
+				old_ce_phys = root_entry_lctp(&re);
 			else
-				old_ce_phys = root_entry_uctp(old_re);
+				old_ce_phys = root_entry_uctp(&re);
 
 			if (!old_ce_phys) {
 				if (ext && devfn == 0) {
@@ -2854,7 +2857,7 @@ static int copy_context_table(struct intel_iommu *iommu,
 		}
 
 		/* Now copy the context entry */
-		ce = old_ce[idx];
+		memcpy_fromio(&ce, old_ce + idx, sizeof(ce));
 
 		if (!__context_present(&ce))
 			continue;
@@ -2898,8 +2901,8 @@ out:
 
 static int copy_translation_tables(struct intel_iommu *iommu)
 {
+	struct root_entry __iomem *old_rt;
 	struct context_entry **ctxt_tbls;
-	struct root_entry *old_rt;
 	phys_addr_t old_rt_phys;
 	int ctxt_table_entries;
 	unsigned long flags;
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 27cdfa8..9ec4e0d 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -384,7 +384,7 @@ static int set_msi_sid(struct irte *irte, struct pci_dev *dev)
 
 static int iommu_load_old_irte(struct intel_iommu *iommu)
 {
-	struct irte *old_ir_table;
+	struct irte __iomem *old_ir_table;
 	phys_addr_t irt_phys;
 	unsigned int i;
 	size_t size;
@@ -413,7 +413,7 @@ static int iommu_load_old_irte(struct intel_iommu *iommu)
 		return -ENOMEM;
 
 	/* Copy data over */
-	memcpy(iommu->ir_table->base, old_ir_table, size);
+	memcpy_fromio(iommu->ir_table->base, old_ir_table, size);
 
 	__iommu_flush_cache(iommu, iommu->ir_table->base, size);
 
-- 
1.9.1


  parent reply	other threads:[~2015-08-13 17:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-13 17:33 [PATCH 0/9] iommu: Fix some static checker warnings Joerg Roedel
2015-08-13 17:33 ` [PATCH 1/9] iommu/amd: Simplify allocation in irq_remapping_alloc() Joerg Roedel
2015-08-13 17:33 ` [PATCH 2/9] iommu/amd: Make a symbol static Joerg Roedel
2015-08-13 17:33 ` [PATCH 3/9] iommu/amd: Use BUG_ON instead of if () BUG() Joerg Roedel
2015-08-13 17:33 ` [PATCH 4/9] iommu/vt-d: Return false instead of 0 in irq_remapping_cap() Joerg Roedel
2015-08-13 17:33 ` [PATCH 5/9] iommu/vt-d: Use BUG_ON instead of if () BUG() Joerg Roedel
2015-08-13 17:33 ` [PATCH 6/9] iommu/vt-d: Make two functions static Joerg Roedel
2015-08-13 17:33 ` Joerg Roedel [this message]
2015-08-13 17:33 ` [PATCH 8/9] iommu/msm: Use BUG_ON instead of if () BUG() Joerg Roedel
2015-08-13 17:33 ` [PATCH 9/9] iommu/io-pgtable-arm: Move init-fn declarations to io-pgtable.h Joerg Roedel

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