From dec991e4722d763130c8ccd92523f2a173f8a7cd Mon Sep 17 00:00:00 2001 From: Kyung Min Park <kyung.min.park@intel.com> Date: Sun, 14 Mar 2021 13:15:34 -0700 Subject: [PATCH] iommu/vt-d: Disable SVM when ATS/PRI/PASID are not enabled in the device Currently, the Intel VT-d supports Shared Virtual Memory (SVM) only when IO page fault is supported. Otherwise, shared memory pages can not be swapped out and need to be pinned. The device needs the Address Translation Service (ATS), Page Request Interface (PRI) and Process Address Space Identifier (PASID) capabilities to be enabled to support IO page fault. Disable SVM when ATS, PRI and PASID are not enabled in the device. Signed-off-by: Kyung Min Park <kyung.min.park@intel.com> Acked-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20210314201534.918-1-kyung.min.park@intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de> --- drivers/iommu/intel/iommu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index ee0932307d646..956a02eb40b4f 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -5380,6 +5380,9 @@ intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat) if (!info) return -EINVAL; + if (!info->pasid_enabled || !info->pri_enabled || !info->ats_enabled) + return -EINVAL; + if (info->iommu->flags & VTD_FLAG_SVM_CAPABLE) return 0; }