[Qemu-devel] [PATCH 3/4] acpi: provide _PXM method for CPU devices if QEMU is started numa enabled

[Igor Mammedov <imammedo@redhat.com>]

fixes long standing issue where Linux kernel would assing
hotplugged CPU to 1st numa node as it discards proximity
for hotplugged CPUs after SRAT is parsed.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/acpi/cpu.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c
index c13b65c..d9cf3ee 100644
--- a/hw/acpi/cpu.c
+++ b/hw/acpi/cpu.c
@@ -4,6 +4,7 @@
 #include "qapi/error.h"
 #include "qapi-event.h"
 #include "trace.h"
+#include "sysemu/numa.h"
 
 #define ACPI_CPU_HOTPLUG_REG_LEN 12
 #define ACPI_CPU_SELECTOR_OFFSET_WR 0
@@ -503,6 +504,7 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
 
         /* build Processor object for each processor */
         for (i = 0; i < arch_ids->len; i++) {
+            int j;
             Aml *dev;
             Aml *uid = aml_int(i);
             GArray *madt_buf = g_array_new(0, 1, 1);
@@ -546,6 +548,13 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
                           aml_arg(1), aml_arg(2))
             );
             aml_append(dev, method);
+
+            for (j = 0; j < nb_numa_nodes; j++) {
+                if (test_bit(i, numa_info[j].node_cpu)) {
+                    aml_append(dev, aml_name_decl("_PXM", aml_int(j)));
+                }
+            }
+
             aml_append(cpus_dev, dev);
         }
     }
-- 
1.8.3.1