linux-kernel - [PATCH] PCI: hv: Fix NUMA node assignment when kernel boots with parameters affecting NUMA topology

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Date:   Thu,  6 Jan 2022 15:20:28 -0800
From:   longli@...uxonhyperv.com
To:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, paekkaladevi@...rosoft.com
Cc:     Long Li <longli@...rosoft.com>
Subject: [PATCH] PCI: hv: Fix NUMA node assignment when kernel boots with parameters affecting NUMA topology

From: Long Li <longli@...rosoft.com>

When the kernel boots with parameters restricting the number of cpus or NUMA
nodes, e.g. maxcpus=X or numa=off, the vPCI driver should only set to the NUMA
node to a value that is valid in the current running kernel.

Signed-off-by: Long Li <longli@...rosoft.com>
---
 drivers/pci/controller/pci-hyperv.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index fc1a29acadbb..8686343eff4c 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -1835,8 +1835,21 @@ static void hv_pci_assign_numa_node(struct hv_pcibus_device *hbus)
 		if (!hv_dev)
 			continue;
 
-		if (hv_dev->desc.flags & HV_PCI_DEVICE_FLAG_NUMA_AFFINITY)
-			set_dev_node(&dev->dev, hv_dev->desc.virtual_numa_node);
+		if (hv_dev->desc.flags & HV_PCI_DEVICE_FLAG_NUMA_AFFINITY) {
+			int cpu;
+			bool found_node = false;
+
+			for_each_possible_cpu(cpu)
+				if (cpu_to_node(cpu) ==
+				    hv_dev->desc.virtual_numa_node) {
+					found_node = true;
+					break;
+				}
+
+			if (found_node)
+				set_dev_node(&dev->dev,
+					     hv_dev->desc.virtual_numa_node);
+		}
 
 		put_pcichild(hv_dev);
 	}
-- 
2.25.1