When system turns NUMA off or system lacks of NUMA support,
Xen will fake a NUMA node to make system works as a single
node NUMA system.
In this case the memory node map doesn't need to be allocated
from boot pages, it will use the _memnodemap directly. But
memnodemapsize hasn't been set. Xen should assert in phys_to_nid.
Because x86 was using an empty macro "VIRTUAL_BUG_ON" to replace
SSERT, this bug will not be triggered on x86.
Actually, Xen will only use 1 slot of memnodemap in this case.
So we set memnodemap[0] to 0 and memnodemapsize to 1 in this
patch to fix it.
Signed-off-by: Wei Chen <wei.c...@arm.com>
---
xen/arch/x86/numa.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/xen/arch/x86/numa.c b/xen/arch/x86/numa.c
index f1066c59c7..ce79ee44ce 100644
--- a/xen/arch/x86/numa.c
+++ b/xen/arch/x86/numa.c
@@ -270,6 +270,10 @@ void __init numa_initmem_init(unsigned long start_pfn,
unsigned long end_pfn)
/* setup dummy node covering all memory */
memnode_shift = BITS_PER_LONG - 1;
memnodemap = _memnodemap;
+ /* Dummy node only uses 1 slot in reality */
+ memnodemap[0] = 0;
+ memnodemapsize = 1;
+
nodes_clear(node_online_map);
node_set_online(0);
for ( i = 0; i < nr_cpu_ids; i++ )
--
2.25.1
