Messages in this thread Patch in this message | | | From | Yi Liu <> | Subject | [PATCH v2 05/11] iommufd/hw_pagetable: Do not populate user-managed hw_pagetables | Date | Thu, 11 May 2023 07:38:38 -0700 |
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From: Nicolin Chen <nicolinc@nvidia.com>
A user-managed hw_pagetable does not need to get populated, since it is managed by a guest OS. Move the iopt_table_add_domain and list_add_tail calls into a helper, where the hwpt pointer will be redirected to its hwpt->parent if it's available.
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Yi Liu <yi.l.liu@intel.com> --- drivers/iommu/iommufd/hw_pagetable.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c index ec9b140939ce..73d7d9d07726 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -58,6 +58,24 @@ int iommufd_hw_pagetable_enforce_cc(struct iommufd_hw_pagetable *hwpt) return 0; } +static int iommufd_hw_pagetable_link_ioas(struct iommufd_hw_pagetable *hwpt) +{ + int rc; + + /* + * Only a parent hwpt needs to be linked to the IOAS. And a hwpt->parent + * must be linked to the IOAS already, when it's being allocated. + */ + if (hwpt->parent) + return 0; + + rc = iopt_table_add_domain(&hwpt->ioas->iopt, hwpt->domain); + if (rc) + return rc; + list_add_tail(&hwpt->hwpt_item, &hwpt->ioas->hwpt_list); + return 0; +} + /** * iommufd_hw_pagetable_alloc() - Get an iommu_domain for a device * @ictx: iommufd context @@ -151,10 +169,9 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas, goto out_abort; } - rc = iopt_table_add_domain(&hwpt->ioas->iopt, hwpt->domain); + rc = iommufd_hw_pagetable_link_ioas(hwpt); if (rc) goto out_detach; - list_add_tail(&hwpt->hwpt_item, &hwpt->ioas->hwpt_list); return hwpt; out_detach: -- 2.34.1
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