[RFC PATCH v4 20/28] iommu/amd: Disable AMD IOMMU if memory encryption is active
From: Tom Lendacky <thomas.lendacky@amd.com>
Date: 2017-02-16 15:47:11
Also in:
kvm, linux-arch, linux-iommu, linux-mm, lkml
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
For now, disable the AMD IOMMU if memory encryption is active. A future patch will re-enable the function with full memory encryption support. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> --- drivers/iommu/amd_iommu_init.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 6799cf9..6df2dd5 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c@@ -29,6 +29,7 @@ #include <linux/export.h> #include <linux/iommu.h> #include <linux/kmemleak.h> +#include <linux/mem_encrypt.h> #include <asm/pci-direct.h> #include <asm/iommu.h> #include <asm/gart.h>
@@ -2544,6 +2545,12 @@ int __init amd_iommu_detect(void) if (amd_iommu_disabled) return -ENODEV; + /* For now, disable the IOMMU if SME is active */ + if (sme_active()) { + pr_notice("AMD-Vi: SME is active, disabling the IOMMU\n"); + return -ENODEV; + } + ret = iommu_go_to_state(IOMMU_IVRS_DETECTED); if (ret) return ret; --
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