From 954e3dd8308501bb00cae4ed655968282dc65314 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Sun, 2 Dec 2012 15:35:37 +0100 Subject: [PATCH] iommu/amd: Don't use 512GB pages There is a bug in the hardware that will be triggered when this page size is used. Make sure this does not happen. Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index cb63cc5..98d74ab 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -66,8 +66,10 @@ * * If at some point we'd like to utilize the IOMMU core's new behavior, * we could change this to advertise the real page sizes we support. + * + * 512GB Pages are not supported due to a hardware bug */ -#define AMD_IOMMU_PGSIZES (~0xFFFUL) +#define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38)) static DEFINE_RWLOCK(amd_iommu_devtable_lock); -- 2.7.4