Messages in this thread | | | Subject | Re: [PATCH] iommu/vt-d: Disable SVM when ATS/PRI/PASID are not enabled in the device | From | Lu Baolu <> | Date | Mon, 15 Mar 2021 08:30:18 +0800 |
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On 3/15/21 4:15 AM, Kyung Min Park wrote: > 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> > --- > 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 ee0932307d64..956a02eb40b4 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; > } >
Thanks for the patch.
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Best regards, baolu
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