From 3c677d206210f53a4be972211066c0f1cd47fe12 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Fri, 12 Apr 2019 12:50:31 +0200 Subject: [PATCH] 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 --- drivers/iommu/amd_iommu_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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)