Re: [Qemu-devel] [RFC 2/5] hw/arm/virt: Enable dynamic generation of guest RAM memory regions

[Zhu Yijun]

Hi Andrew,

Thanks for your review!

On 2017/11/14 22:47, Andrew Jones wrote:
> On Tue, Nov 14, 2017 at 09:15:51AM +0800, address@hidden wrote:
>> From: Zhu Yijun <address@hidden>
>>
>> Register a ram_memory_region_init notify to allocate memory region
>> from system memory and add them as subregions.
>>
>> Signed-off-by: Zhu Yijun <address@hidden>
>> ---
>>  hw/arm/virt.c         | 21 ++++++++++++++++-----
>>  include/hw/arm/virt.h |  1 +
>>  2 files changed, 17 insertions(+), 5 deletions(-)
>>
>> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
>> index 9e18b41..ddde5e1 100644
>> --- a/hw/arm/virt.c
>> +++ b/hw/arm/virt.c
>> @@ -1225,6 +1225,19 @@ void virt_machine_done(Notifier *notifier, void *data)
>>      virt_build_smbios(vms);
>>  }
>>  
>> +static void virt_ram_memory_region_init(Notifier *notifier, void *data)
>> +{
>> +    MachineState *machine = MACHINE(qdev_get_machine());
> No need to use qdev_get_machine(), you can get it with MACHINE(vms).
OK
>> +    MemoryRegion *sysmem = get_system_memory();
>> +    MemoryRegion *ram = g_new(MemoryRegion, 1);
>> +    VirtMachineState *vms = container_of(notifier, VirtMachineState,
>> +                                         ram_memory_region_init);
>> +
>> +    memory_region_allocate_system_memory(ram, NULL, "mach-virt.ram",
>> +                                         machine->ram_size);
>> +    memory_region_add_subregion(sysmem, vms->memmap[VIRT_MEM].base, ram);
>> +}
>> +
>>  static uint64_t virt_cpu_mp_affinity(VirtMachineState *vms, int idx)
>>  {
>>      uint8_t clustersz = ARM_DEFAULT_CPUS_PER_CLUSTER;
>> @@ -1258,7 +1271,6 @@ static void machvirt_init(MachineState *machine)
>>      MemoryRegion *sysmem = get_system_memory();
>>      MemoryRegion *secure_sysmem = NULL;
>>      int n, virt_max_cpus;
>> -    MemoryRegion *ram = g_new(MemoryRegion, 1);
>>      bool firmware_loaded = bios_name || drive_get(IF_PFLASH, 0, 0);
>>  
>>      /* We can probe only here because during property set
>> @@ -1409,10 +1421,6 @@ static void machvirt_init(MachineState *machine)
>>      fdt_add_cpu_nodes(vms);
>>      fdt_add_psci_node(vms);
>>  
>> -    memory_region_allocate_system_memory(ram, NULL, "mach-virt.ram",
>> -                                         machine->ram_size);
>> -    memory_region_add_subregion(sysmem, vms->memmap[VIRT_MEM].base, ram);
>> -
>>      create_flash(vms, sysmem, secure_sysmem ? secure_sysmem : sysmem);
>>  
>>      create_gic(vms, pic);
>> @@ -1462,6 +1470,9 @@ static void machvirt_init(MachineState *machine)
>>       * Notifiers are executed in registration reverse order.
>>       */
>>      create_platform_bus(vms, pic);
>> +
>> +    vms->ram_memory_region_init.notify = virt_ram_memory_region_init;
>> +    qemu_add_machine_init_done_notifier(&vms->ram_memory_region_init);
> Does this notifier need to be the first one executed? If so, then a
> comment should be added to state that. Actually the comment above
> create_platform_bus() could be replaced with a comment above the first
> notifier that states all notifier dependencies.
Yes, it should be the first notifier, because reserved memory regions must get 
before memory node created in arm_load_kernel_notify.
>>  }
>>  
>>  static bool virt_get_secure(Object *obj, Error **errp)
>> diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h
>> index 33b0ff3..38906b8 100644
>> --- a/include/hw/arm/virt.h
>> +++ b/include/hw/arm/virt.h
>> @@ -90,6 +90,7 @@ typedef struct {
>>  typedef struct {
>>      MachineState parent;
>>      Notifier machine_done;
>> +    Notifier ram_memory_region_init;
>>      FWCfgState *fw_cfg;
>>      bool secure;
>>      bool highmem;
>> -- 
>> 1.8.3.1
>>
>>
>>
> Thanks,
> drew 
>
> .
>