[PATCH AUTOSEL 4.14 41/43] iommu/amd: Reserve exclusion range in iova-domain

Sasha Levin
2019-04-22T19:48:49Z

From: Joerg Roedel <jroedel@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 <jroedel@suse.de>
Reviewed-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Sasha Levin (Microsoft) <sashal@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 bd339bfe0d15..684f7cdd814b 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3127,21 +3127,24 @@ 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 b97984a5ddad..91d7718625a6 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1980,6 +1980,9 @@ 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);
@@ -2026,9 +2029,7 @@ 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 f6b24c7d8b70..3054c0971759 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -369,6 +369,8 @@
#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