lkml.org 
[lkml]   [2021]   [Mar]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] iommu/vt-d: Disable SVM when ATS/PRI/PASID are not enabled in the device
From
Date
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

\
 
 \ /
  Last update: 2021-03-15 01:41    [W:0.042 / U:0.292 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site