IOMMU v2 page table supports 4 level (47 bit) or 5 level (56 bit) virtual
address space. Current code assumes it can support 64bit IOVA address
space. If IOVA allocator allocates virtual address > 47/56 bit (depending
on page table level) then it will do wrong mapping and cause invalid
translation.
Hence adjust aperture size to use max address supported by the page table.
Reported-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Fixes: aaac38f61487 ("iommu/amd: Initial support for AMD IOMMU v2 page table")
Cc: <Stable@xxxxxxxxxxxxxxx> # v6.0+
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Signed-off-by: Vasant Hegde <vasant.hegde@xxxxxxx>
---
drivers/iommu/amd/iommu.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 5aaa4cf84506..e14c7c666745 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2128,6 +2128,15 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
return NULL;
}
+static inline u64 dma_max_address(void)
+{
+ if (amd_iommu_pgtable == AMD_IOMMU_V1)
+ return ~0ULL;
+
+ /* V2 with 4/5 level page table */
+ return ((1ULL << PM_LEVEL_SHIFT(amd_iommu_gpt_level)) - 1);
+}
+
static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
{
struct protection_domain *domain;
@@ -2144,7 +2153,7 @@ static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
return NULL;
domain->domain.geometry.aperture_start = 0;
- domain->domain.geometry.aperture_end = ~0ULL;
+ domain->domain.geometry.aperture_end = dma_max_address();
domain->domain.geometry.force_aperture = true;
return &domain->domain;
--
2.31.1
