Re: [Qemu-devel] [PATCH v5 08/10] PC: Support dynamic sysbus on pc_i440fx

[Ben Warren]

Hi
> On Feb 12, 2017, at 11:55 AM, Marcel Apfelbaum <address@hidden> wrote:
> 
> On 02/06/2017 06:31 PM, Michael S. Tsirkin wrote:
>> On Sun, Feb 05, 2017 at 01:12:03AM -0800, address@hidden wrote:
>>> From: Ben Warren <address@hidden>
>>> 
>>> This allows pc_i440fx-based machines to add new devices such as
>>> VM Generation ID directly to the sysbus.
>>> 
>>> Signed-off-by: Ben Warren <address@hidden>
>> 
> 
> Hi,
> 
>> Only point is, we might have to add more flags like
>> cannot_instantiate_with_device_add_yet
>> to a bunch of devices.
>> 
>> Marcel, you did a similar thing for q35, can you
>> take a look here as well pls?
>> 
> 
> The change is a must because the new vmgenid device
> is a sysbus device and QEMU will not allow it without
> marking explicitly that i440fx supports sysbus device.
> 
As recommended by Igor, I was able to make the vmgenid work with DeviceClass as 
parent (i.e. not on sysbus), so this work can be deferred until it’s really 
needed.  The next patch set (hopefully posted tonight) will drop this patch.
> As you already mentioned, we need to make sure that
> all sysbus devices that can be added to the PC machines
> are marked with "cannot_instantiate_with_device_add_yet".
> 
> Sadly I see no easy way, but going manually over each one...
> 
> Thanks,
> Marcel
> 
—Ben
>>> ---
>>> hw/i386/pc_piix.c | 1 +
>>> 1 file changed, 1 insertion(+)
>>> 
>>> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
>>> index 9f102aa..c8ad99c 100644
>>> --- a/hw/i386/pc_piix.c
>>> +++ b/hw/i386/pc_piix.c
>>> @@ -435,6 +435,7 @@ static void pc_i440fx_machine_options(MachineClass *m)
>>>     m->hot_add_cpu = pc_hot_add_cpu;
>>>     m->default_machine_opts = "firmware=bios-256k.bin";
>>>     m->default_display = "std";
>>> +    m->has_dynamic_sysbus = true;
>>> }
>>> 
>>> static void pc_i440fx_2_9_machine_options(MachineClass *m)
>>> --
>>> 2.7.4
>> 
>

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