21 Mar
2023
21 Mar
'23
1:25 a.m.
From: Jason Gunthorpe jgg@nvidia.com Sent: Monday, March 20, 2023 8:47 PM
On Fri, Mar 17, 2023 at 10:23:54AM +0000, Tian, Kevin wrote:
From: Liu, Yi L yi.l.liu@intel.com Sent: Thursday, March 9, 2023 4:09 PM
- /* It must be either NESTED or UNMANAGED, depending on
parent_domain */
- if ((parent_domain && hwpt->domain->type !=
IOMMU_DOMAIN_NESTED) ||
(!parent_domain && hwpt->domain->type !=IOMMU_DOMAIN_UNMANAGED))
goto out_abort;WARN_ON()
Wouldn't that be userspace triggerable? It gets to pick the hwpt used.
The domain type is set by iommu driver instead of userspace. A sane driver should pass above check, if it claims to support nested.