linux-kernel - [PATCH 05/11] iommu/vt-d: Do not wipe out the page table NID when devices detach

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Message-ID: <20250714045028.958850-6-baolu.lu@linux.intel.com>
Date: Mon, 14 Jul 2025 12:50:22 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>
Cc: iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH 05/11] iommu/vt-d: Do not wipe out the page table NID when devices detach

From: Jason Gunthorpe <jgg@...dia.com>

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: Wei Wang <wei.w.wang@...el.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Link: https://lore.kernel.org/r/3-v3-dbbe6f7e7ae3+124ffe-vtd_prep_jgg@nvidia.com
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 5c798f30dbc4..55e0ba4d20ae 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -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);
 	}
 }
-- 
2.43.0