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authorJoerg Roedel <jroedel@suse.de>2019-04-12 13:50:31 +0300
committerJoerg Roedel <jroedel@suse.de>2019-04-12 13:59:45 +0300
commit3c677d206210f53a4be972211066c0f1cd47fe12 (patch)
tree0784753e89b9847d082df06b83e6a915b0644d5d /drivers/iommu/amd_iommu_init.c
parent15ade5d2e7775667cf191cf2f94327a4889f8b9d (diff)
downloadlinux-3c677d206210f53a4be972211066c0f1cd47fe12.tar.xz
iommu/amd: Set exclusion range correctly
The exlcusion range limit register needs to contain the base-address of the last page that is part of the range, as bits 0-11 of this register are treated as 0xfff by the hardware for comparisons. So correctly set the exclusion range in the hardware to the last page which is _in_ the range. Fixes: b2026aa2dce44 ('x86, AMD IOMMU: add functions for programming IOMMU MMIO space') Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
-rw-r--r--drivers/iommu/amd_iommu_init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 1b1378619fc9..ff40ba758cf3 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -359,7 +359,7 @@ static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
static void iommu_set_exclusion_range(struct amd_iommu *iommu)
{
u64 start = iommu->exclusion_start & PAGE_MASK;
- u64 limit = (start + iommu->exclusion_length) & PAGE_MASK;
+ u64 limit = (start + iommu->exclusion_length - 1) & PAGE_MASK;
u64 entry;
if (!iommu->exclusion_start)