Re: [PATCH 4/6] iommufd/hw_pagetable: Support allocating nested parent domain

From: Yi Liu
Date: Tue Sep 26 2023 - 01:48:03 EST


On 2023/9/26 13:32, Tian, Kevin wrote:
From: Liu, Yi L <yi.l.liu@xxxxxxxxx>
Sent: Tuesday, September 19, 2023 5:25 PM

@@ -83,6 +83,9 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx,
struct iommufd_ioas *ioas,

lockdep_assert_held(&ioas->mutex);

+ if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ops-
domain_alloc_user)
+ return ERR_PTR(-EOPNOTSUPP);
+

if (flags && !ops->domain_alloc_user)
return ERR_PTR(-EOPNOTSUPP);

as long as flags is non-zero we'll need the new alloc_user ops.

yes.

--
Regards,
Yi Liu