[Qemu-devel] [PATCH 13/35] pc: initialize memory hotplug address space

[Igor Mammedov]

initialize and map hotplug memory address space container
into guest's RAM address space.

Signed-off-by: Igor Mammedov <imamm...@redhat.com>
---
 hw/i386/pc.c         | 19 +++++++++++++++++--
 include/hw/i386/pc.h | 10 ++++++++++
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 32b4003..69e4225 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1171,6 +1171,9 @@ FWCfgState *pc_memory_init(MemoryRegion *system_memory,
     MemoryRegion *ram, *option_rom_mr;
     MemoryRegion *ram_below_4g, *ram_above_4g;
     FWCfgState *fw_cfg;
+    ram_addr_t ram_size = below_4g_mem_size + above_4g_mem_size;
+    MachineState *machine = MACHINE(qdev_get_machine());
+    PCMachineState *pcms = PC_MACHINE(machine);
 
     linux_boot = (kernel_filename != NULL);
 
@@ -1179,8 +1182,7 @@ FWCfgState *pc_memory_init(MemoryRegion *system_memory,
      * with older qemus that used qemu_ram_alloc().
      */
     ram = g_malloc(sizeof(*ram));
-    memory_region_init_ram(ram, NULL, "pc.ram",
-                           below_4g_mem_size + above_4g_mem_size);
+    memory_region_init_ram(ram, NULL, "pc.ram", ram_size);
     vmstate_register_ram_global(ram);
     *ram_memory = ram;
     ram_below_4g = g_malloc(sizeof(*ram_below_4g));
@@ -1197,6 +1199,19 @@ FWCfgState *pc_memory_init(MemoryRegion *system_memory,
         e820_add_entry(0x100000000ULL, above_4g_mem_size, E820_RAM);
     }
 
+    /* initialize hotplug memory address space */
+    if (ram_size < machine->init_args.maxram_size) {
+        ram_addr_t hotplug_mem_size =
+            machine->init_args.maxram_size - ram_size;
+
+        pcms->hotplug_memory_base =
+            ROUND_UP(0x100000000ULL + above_4g_mem_size, 1ULL << 30);
+
+        memory_region_init(&pcms->hotplug_memory, OBJECT(pcms),
+                           "hotplug-memory", hotplug_mem_size);
+        memory_region_add_subregion(system_memory, pcms->hotplug_memory_base,
+                                    &pcms->hotplug_memory);
+    }
 
     /* Initialize PC system firmware */
     pc_system_firmware_init(rom_memory, guest_info->isapc_ram_fw);
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index b3bc0f7..a1f21ba 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -16,9 +16,19 @@
 
 #define HPET_INTCAP "hpet-intcap"
 
+/**
+ * PCMachineState:
+ * @hotplug_memory_base: address in guest RAM address space where hotplug 
memory
+ * address space begins.
+ * @hotplug_memory: hotplug memory addess space container
+ */
 struct PCMachineState {
     /*< private >*/
     MachineState parent_obj;
+
+    /* <public> */
+    ram_addr_t hotplug_memory_base;
+    MemoryRegion hotplug_memory;
 };
 
 struct PCMachineClass {
-- 
1.9.0