[Qemu-devel] [PATCH 24/35] acpi:piix4: add memory hotplug handling

[Igor Mammedov <imammedo@redhat.com>]

Add memory hotplug initialization/handling to PIIX4_PM device
and enable it by default for post 2.0 machine types

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/acpi/piix4.c                  | 15 ++++++++++++++-
 hw/i386/pc_piix.c                |  4 ++++
 include/hw/acpi/memory_hotplug.h |  1 +
 include/hw/i386/pc.h             |  8 ++++++++
 4 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index 4341f82..056a7bc 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -33,6 +33,8 @@
 #include "hw/acpi/pcihp.h"
 #include "hw/acpi/cpu_hotplug.h"
 #include "hw/hotplug.h"
+#include "hw/mem/dimm.h"
+#include "hw/acpi/memory_hotplug.h"
 
 //#define DEBUG
 
@@ -81,6 +83,8 @@ typedef struct PIIX4PMState {
 
     AcpiCpuHotplug gpe_cpu;
     Notifier cpu_added_notifier;
+
+    MemHotplugState acpi_memory_hotplug;
 } PIIX4PMState;
 
 #define TYPE_PIIX4_PM "PIIX4_PM"
@@ -315,7 +319,10 @@ static void piix4_device_plug_cb(HotplugHandler *hotplug_dev,
 {
     PIIX4PMState *s = PIIX4_PM(hotplug_dev);
 
-    if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
+    if (s->acpi_memory_hotplug.is_enabled &&
+        object_dynamic_cast(OBJECT(dev), TYPE_DIMM)) {
+        acpi_memory_plug_cb(&s->ar, s->irq, &s->acpi_memory_hotplug, dev, errp);
+    } else if (object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
         acpi_pcihp_device_plug_cb(&s->ar, s->irq, &s->acpi_pci_hotplug, dev,
                                   errp);
     } else {
@@ -533,6 +540,10 @@ static void piix4_acpi_system_hot_add_init(MemoryRegion *parent,
                         PIIX4_CPU_HOTPLUG_IO_BASE);
     s->cpu_added_notifier.notify = piix4_cpu_added_req;
     qemu_register_cpu_added_notifier(&s->cpu_added_notifier);
+
+    if (s->acpi_memory_hotplug.is_enabled) {
+        acpi_memory_hotplug_init(parent, OBJECT(s), &s->acpi_memory_hotplug);
+    }
 }
 
 static Property piix4_pm_properties[] = {
@@ -542,6 +553,8 @@ static Property piix4_pm_properties[] = {
     DEFINE_PROP_UINT8(ACPI_PM_PROP_S4_VAL, PIIX4PMState, s4_val, 2),
     DEFINE_PROP_BOOL("acpi-pci-hotplug-with-bridge-support", PIIX4PMState,
                      use_acpi_pci_hotplug, true),
+    DEFINE_PROP_BOOL("memory-hotplug-support", PIIX4PMState,
+                     acpi_memory_hotplug.is_enabled, true),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 098fbfc..1329a50 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -414,6 +414,10 @@ static QEMUMachine pc_i440fx_machine_v2_0 = {
     .name = "pc-i440fx-2.0",
     .alias = "pc",
     .init = pc_init_pci_2_0,
+    .compat_props = (GlobalProperty[]) {
+        PC_COMPAT_2_0,
+        { /* end of list */ }
+    },
 };
 
 #define PC_I440FX_1_7_MACHINE_OPTIONS PC_I440FX_MACHINE_OPTIONS
diff --git a/include/hw/acpi/memory_hotplug.h b/include/hw/acpi/memory_hotplug.h
index 8f90f72..912c53f 100644
--- a/include/hw/acpi/memory_hotplug.h
+++ b/include/hw/acpi/memory_hotplug.h
@@ -15,6 +15,7 @@ typedef struct MemStatus {
 } MemStatus;
 
 typedef struct MemHotplugState {
+    bool is_enabled; /* true if memory hotplug is supported */
     MemoryRegion io;
     uint32_t selector;
     uint32_t dev_count;
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 059e137..630bdb2 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -303,7 +303,15 @@ int e820_add_entry(uint64_t, uint64_t, uint32_t);
         PC_COMPAT_1_4, \
         PC_Q35_COMPAT_1_5
 
+#define PC_COMPAT_2_0 \
+        {\
+            .driver   = "PIIX4_PM",\
+            .property = "memory-hotplug-support",\
+            .value    = "off",\
+        }
+
 #define PC_COMPAT_1_7 \
+        PC_COMPAT_2_0, \
         {\
             .driver   = TYPE_USB_DEVICE,\
             .property = "msos-desc",\
-- 
1.9.0