[v4] MemoryDevice: use multi stage hotplug handlers

[Qemu-devel] [PATCH v4 05/14] pc: route all memory devices through the machine hotplug handler

Posted by David Hildenbrand 7 years, 5 months ago

Necessary to hotplug them cleanly later. We could drop the PC_DIMM
check, as PC_DIMM are just memory devices, but this approach is cleaner.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/i386/pc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 510076e156..8bc41ef24b 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -74,6 +74,7 @@
 #include "hw/nmi.h"
 #include "hw/i386/intel_iommu.h"
 #include "hw/net/ne2000-isa.h"
+#include "hw/mem/memory-device.h"
 
 /* debug PC/ISA interrupts */
 //#define DEBUG_IRQ
@@ -2075,6 +2076,7 @@ static HotplugHandler *pc_get_hotpug_handler(MachineState *machine,
                                              DeviceState *dev)
 {
     if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
+        object_dynamic_cast(OBJECT(dev), TYPE_MEMORY_DEVICE) ||
         object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
         return HOTPLUG_HANDLER(machine);
     }
-- 
2.14.3

Re: [Qemu-devel] [PATCH v4 05/14] pc: route all memory devices through the machine hotplug handler

Posted by Igor Mammedov 7 years, 5 months ago

On Thu, 17 May 2018 10:15:18 +0200
David Hildenbrand <david@redhat.com> wrote:

> Necessary to hotplug them cleanly later. We could drop the PC_DIMM
> check, as PC_DIMM are just memory devices, but this approach is cleaner.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>
> ---
>  hw/i386/pc.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index 510076e156..8bc41ef24b 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -74,6 +74,7 @@
>  #include "hw/nmi.h"
>  #include "hw/i386/intel_iommu.h"
>  #include "hw/net/ne2000-isa.h"
> +#include "hw/mem/memory-device.h"
>  
>  /* debug PC/ISA interrupts */
>  //#define DEBUG_IRQ
> @@ -2075,6 +2076,7 @@ static HotplugHandler *pc_get_hotpug_handler(MachineState *machine,
>                                               DeviceState *dev)
>  {
>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
> +        object_dynamic_cast(OBJECT(dev), TYPE_MEMORY_DEVICE) ||
you probably could drop TYPE_PC_DIMM above, it's redundant since DIMM
can be cast to TYPE_MEMORY_DEVICE

ditto for spapr

>          object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
>          return HOTPLUG_HANDLER(machine);
>      }

Re: [Qemu-devel] [PATCH v4 05/14] pc: route all memory devices through the machine hotplug handler

Posted by David Hildenbrand 7 years, 5 months ago

On 30.05.2018 15:12, Igor Mammedov wrote:
> On Thu, 17 May 2018 10:15:18 +0200
> David Hildenbrand <david@redhat.com> wrote:
> 
>> Necessary to hotplug them cleanly later. We could drop the PC_DIMM
>> check, as PC_DIMM are just memory devices, but this approach is cleaner.
>>
>> Signed-off-by: David Hildenbrand <david@redhat.com>
>> ---
>>  hw/i386/pc.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
>> index 510076e156..8bc41ef24b 100644
>> --- a/hw/i386/pc.c
>> +++ b/hw/i386/pc.c
>> @@ -74,6 +74,7 @@
>>  #include "hw/nmi.h"
>>  #include "hw/i386/intel_iommu.h"
>>  #include "hw/net/ne2000-isa.h"
>> +#include "hw/mem/memory-device.h"
>>  
>>  /* debug PC/ISA interrupts */
>>  //#define DEBUG_IRQ
>> @@ -2075,6 +2076,7 @@ static HotplugHandler *pc_get_hotpug_handler(MachineState *machine,
>>                                               DeviceState *dev)
>>  {
>>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
>> +        object_dynamic_cast(OBJECT(dev), TYPE_MEMORY_DEVICE) ||
> you probably could drop TYPE_PC_DIMM above, it's redundant since DIMM
> can be cast to TYPE_MEMORY_DEVICE
> 
> ditto for spapr
> 

Yes, had the same in mind but left it for now this way (basically
because we do special handling for PC_DIMM, so anybody reading this code
is not directly confused)

>>          object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
>>          return HOTPLUG_HANDLER(machine);
>>      }
> 


-- 

Thanks,

David / dhildenb

Re: [Qemu-devel] [PATCH v4 05/14] pc: route all memory devices through the machine hotplug handler

Posted by Paolo Bonzini 7 years, 5 months ago

On 30/05/2018 16:08, David Hildenbrand wrote:
>>>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
>>> +        object_dynamic_cast(OBJECT(dev), TYPE_MEMORY_DEVICE) ||
>> you probably could drop TYPE_PC_DIMM above, it's redundant since DIMM
>> can be cast to TYPE_MEMORY_DEVICE
>>
>> ditto for spapr
>>
> Yes, had the same in mind but left it for now this way (basically
> because we do special handling for PC_DIMM, so anybody reading this code
> is not directly confused)
> 

Hmm, I think what Igor proposes is nicer.  Can you send a v5 when he's
done with review?

Paolo

Re: [Qemu-devel] [PATCH v4 05/14] pc: route all memory devices through the machine hotplug handler

Posted by David Hildenbrand 7 years, 5 months ago

On 30.05.2018 16:27, Paolo Bonzini wrote:
> On 30/05/2018 16:08, David Hildenbrand wrote:
>>>>      if (object_dynamic_cast(OBJECT(dev), TYPE_PC_DIMM) ||
>>>> +        object_dynamic_cast(OBJECT(dev), TYPE_MEMORY_DEVICE) ||
>>> you probably could drop TYPE_PC_DIMM above, it's redundant since DIMM
>>> can be cast to TYPE_MEMORY_DEVICE
>>>
>>> ditto for spapr
>>>
>> Yes, had the same in mind but left it for now this way (basically
>> because we do special handling for PC_DIMM, so anybody reading this code
>> is not directly confused)
>>
> 
> Hmm, I think what Igor proposes is nicer.  Can you send a v5 when he's
> done with review?

Sure!

> 
> Paolo
> 


-- 

Thanks,

David / dhildenb