[Qemu-devel] [PATCH RFC V2 16/17] hw/pci_bus: add support for NUMA nodes

[Marcel Apfelbaum <marcel@redhat.com>]

PCI root buses can be attached to a specific NUMA node.
PCI buses are not attached be default to a NUMA node.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
 hw/pci/pci_bus.c         | 7 +++++++
 include/hw/pci/pci_bus.h | 6 ++++++
 include/sysemu/sysemu.h  | 1 +
 3 files changed, 14 insertions(+)

diff --git a/hw/pci/pci_bus.c b/hw/pci/pci_bus.c
index ed99208..15882a7 100644
--- a/hw/pci/pci_bus.c
+++ b/hw/pci/pci_bus.c
@@ -13,6 +13,7 @@
 #include "hw/pci/pci_bus.h"
 #include "hw/pci/pci_bridge.h"
 #include "monitor/monitor.h"
+#include "sysemu/sysemu.h"
 
 typedef struct {
     uint16_t class;
@@ -478,6 +479,11 @@ static int pcibus_num(PCIBus *bus)
     return bus->parent_dev->config[PCI_SECONDARY_BUS];
 }
 
+static uint16_t pcibus_numa_node(PCIBus *bus)
+{
+    return NUMA_NODE_UNASSIGNED;
+}
+
 static void pci_bus_class_init(ObjectClass *klass, void *data)
 {
     BusClass *k = BUS_CLASS(klass);
@@ -492,6 +498,7 @@ static void pci_bus_class_init(ObjectClass *klass, void *data)
 
     pbc->is_root = pcibus_is_root;
     pbc->bus_num = pcibus_num;
+    pbc->numa_node = pcibus_numa_node;
 }
 
 static const TypeInfo pci_bus_info = {
diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h
index 553814e..75cd1fa 100644
--- a/include/hw/pci/pci_bus.h
+++ b/include/hw/pci/pci_bus.h
@@ -25,6 +25,7 @@ typedef struct PCIBusClass {
 
     bool (*is_root)(PCIBus *bus);
     int (*bus_num)(PCIBus *bus);
+    uint16_t (*numa_node)(PCIBus *bus);
 } PCIBusClass;
 
 struct PCIBus {
@@ -60,6 +61,11 @@ static inline int pci_bus_num(PCIBus *bus)
     return PCI_BUS_GET_CLASS(bus)->bus_num(bus);
 }
 
+static inline int pci_bus_numa_node(PCIBus *bus)
+{
+    return PCI_BUS_GET_CLASS(bus)->numa_node(bus);
+}
+
 typedef struct PCIBridgeWindows PCIBridgeWindows;
 
 /*
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 748d059..252b9ea 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -139,6 +139,7 @@ extern const char *mem_path;
 extern int mem_prealloc;
 
 #define MAX_NODES 128
+#define NUMA_NODE_UNASSIGNED MAX_NODES
 
 /* The following shall be true for all CPUs:
  *   cpu->cpu_index < max_cpus <= MAX_CPUMASK_BITS
-- 
2.1.0