[PATCH v5 07/12] iommufd: Allocate auto_domain with IOMMU_HWPT_ALLOC_PASID flag if device is PASID-capable

Yi Liu
2024-11-04T13:25:21Z

iommufd cannot predict if user will use pasid or not, but if user is
going to use it, the domains used by PASID-capable device should be
allocated with IOMMU_HWPT_ALLOC_PASID flag.

For domain allocated per userspace request, user should provide this
flag. While for the auto_domain, iommufd needs to make it.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
drivers/iommu/iommufd/device.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index 4e7a473d0dd0..a52937fba366 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -650,7 +650,9 @@ iommufd_device_auto_get_domain(struct iommufd_device *idev, ioasid_t pasid,
goto out_unlock;
}

- hwpt_paging = iommufd_hwpt_paging_alloc(idev->ictx, ioas, idev, 0,
+ hwpt_paging = iommufd_hwpt_paging_alloc(idev->ictx, ioas, idev,
+ idev->dev->iommu->max_pasids ?
+ IOMMU_HWPT_ALLOC_PASID : 0,
immediate_attach, NULL);
if (IS_ERR(hwpt_paging)) {
destroy_hwpt = ERR_CAST(hwpt_paging);
--
2.34.1