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 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