From: Joerg Roedel <jroe...@suse.de>
[ Upstream commit 8aafaaf2212192012f5bae305bb31cdf7681d777 ]
If a device has an exclusion range specified in the IVRS
table, this region needs to be reserved in the iova-domain
of that device. This hasn't happened until now and can cause
data corruption on data transfered with these devices.
Treat exclusion ranges as reserved regions in the iommu-core
to fix the problem.
Fixes: be2a022c0dd0 ('x86, AMD IOMMU: add functions to parse IOMMU memory
mapping requirements for devices')
Signed-off-by: Joerg Roedel <jroe...@suse.de>
Reviewed-by: Gary R Hook <gary.h...@amd.com>
Signed-off-by: Sasha Levin (Microsoft) <sas...@kernel.org>
---
drivers/iommu/amd_iommu.c | 9 ++++++---
drivers/iommu/amd_iommu_init.c | 7 ++++---
drivers/iommu/amd_iommu_types.h | 2 ++
3 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 0b3877681e4a..8d9920ff4134 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3119,21 +3119,24 @@ static void amd_iommu_get_resv_regions(struct device
*dev,
return;
list_for_each_entry(entry, &amd_iommu_unity_map, list) {
+ int type, prot = 0;
size_t length;
- int prot = 0;
if (devid < entry->devid_start || devid > entry->devid_end)
continue;
+ type = IOMMU_RESV_DIRECT;
length = entry->address_end - entry->address_start;
if (entry->prot & IOMMU_PROT_IR)
prot |= IOMMU_READ;
if (entry->prot & IOMMU_PROT_IW)
prot |= IOMMU_WRITE;
+ if (entry->prot & IOMMU_UNITY_MAP_FLAG_EXCL_RANGE)
+ /* Exclusion range */
+ type = IOMMU_RESV_RESERVED;
region = iommu_alloc_resv_region(entry->address_start,
- length, prot,
- IOMMU_RESV_DIRECT);
+ length, prot, type);
if (!region) {
pr_err("Out of memory allocating dm-regions for %s\n",
dev_name(dev));
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index e062ab9687c7..be3801d43d48 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2001,6 +2001,9 @@ static int __init init_unity_map_range(struct ivmd_header
*m)
if (e == NULL)
return -ENOMEM;
+ if (m->flags & IVMD_FLAG_EXCL_RANGE)
+ init_exclusion_range(m);
+
switch (m->type) {
default:
kfree(e);
@@ -2047,9 +2050,7 @@ static int __init init_memory_definitions(struct
acpi_table_header *table)
while (p < end) {
m = (struct ivmd_header *)p;
- if (m->flags & IVMD_FLAG_EXCL_RANGE)
- init_exclusion_range(m);
- else if (m->flags & IVMD_FLAG_UNITY_MAP)
+ if (m->flags & (IVMD_FLAG_UNITY_MAP | IVMD_FLAG_EXCL_RANGE))
init_unity_map_range(m);
p += m->length;
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index e2b342e65a7b..69f3d4c95b53 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -373,6 +373,8 @@
#define IOMMU_PROT_IR 0x01
#define IOMMU_PROT_IW 0x02
+#define IOMMU_UNITY_MAP_FLAG_EXCL_RANGE (1 << 2)
+
/* IOMMU capabilities */
#define IOMMU_CAP_IOTLB 24
#define IOMMU_CAP_NPCACHE 26
--
2.19.1
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
