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[PATCH 14/21] xen/arm: Set Domain-0 node affinity from dom0_nodes option
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Hirokazu Takahashi <taka@xxxxxxxxxxxxx>
- Date: Sun, 24 May 2026 09:02:02 +0900
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- Cc: andrew.cooper3@xxxxxxxxxx, anthony.perard@xxxxxxxxxx, michal.orzel@xxxxxxx, jbeulich@xxxxxxxx, julien@xxxxxxx, roger.pau@xxxxxxxxxx, sstabellini@xxxxxxxxxx, jgross@xxxxxxxx, bertrand.marquis@xxxxxxx, Volodymyr_Babchuk@xxxxxxxx, dfaggioli@xxxxxxxx, gwd@xxxxxxxxxxxxxx, Hirokazu Takahashi <taka@xxxxxxxxxxxxx>
- Delivery-date: Sun, 24 May 2026 00:03:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Set Domain-0's node affinity to run on the NUMA nodes specified via the
'dom0_nodes' boot command line option. If the option is omitted, the
node affinity is configured to use all available NUMA nodes managed by
Xen. When Xen is built with CONFIG_NUMA disabled, the node affinity
falls back to using only NUMA node 0.
---
xen/arch/arm/domain_build.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index f4187512b0..2518909ed0 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -2027,6 +2027,13 @@ void __init create_dom0(void)
if ( llc_coloring_enabled && (rc = dom0_set_llc_colors(dom0)) )
panic("Error initializing LLC coloring for %pd (rc = %d)\n", dom0, rc);
+ nodes_and(dom0_nodes, dom0_nodes, node_online_map);
+ if ( nodes_empty(dom0_nodes) )
+ dom0_nodes = node_online_map;
+
+ dom0->node_affinity = dom0_nodes;
+ dom0->auto_node_affinity = false;
+
if ( vcpu_create(dom0, 0) == NULL )
panic("Error creating %pdv0\n", dom0);
--
2.43.0
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