Commit 5c3687d5 authored by Jason Gunthorpe's avatar Jason Gunthorpe Committed by Will Deacon
Browse files

iommu/vt-d: Do not wipe out the page table NID when devices detach 



The NID is used to control which NUMA node memory for the page table is
allocated it from. It should be a permanent property of the page table
when it was allocated and not change during attach/detach of devices.

Reviewed-by: default avatarWei Wang <wei.w.wang@intel.com>
Reviewed-by: default avatarKevin Tian <kevin.tian@intel.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/3-v3-dbbe6f7e7ae3+124ffe-vtd_prep_jgg@nvidia.com


Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Fixes: 7c204426 ("iommu/vt-d: Add domain_alloc_paging support")
Link: https://lore.kernel.org/r/20250714045028.958850-6-baolu.lu@linux.intel.com


Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 00939beb

drivers/iommu/intel/iommu.c

+0 −1
Original line number Diff line number Diff line
@@ -1391,7 +1391,6 @@ void domain_detach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu) 
	if (--info->refcnt == 0) {

		ida_free(&iommu->domain_ida, info->did);

		xa_erase(&domain->iommu_array, iommu->seq_id);

		domain->nid = NUMA_NO_NODE;

		kfree(info);

	}

}