3.16.72-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Joerg Roedel jroedel@suse.de
commit 3c677d206210f53a4be972211066c0f1cd47fe12 upstream.
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 Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/iommu/amd_iommu_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -293,7 +293,7 @@ static void iommu_write_l2(struct amd_io 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)