Re: [Qemu-devel] [PATCH v7 05/14] apic: save apic_delivered flag

[Paolo Bonzini <pbonzini@redhat.com>]

On 25/01/2017 14:01, Pavel Dovgalyuk wrote:
>> From: Paolo Bonzini [mailto:pbonzini@redhat.com]
>> On 25/01/2017 12:52, Pavel Dovgalyuk wrote:
>>>> From: Paolo Bonzini [mailto:paolo.bonzini@gmail.com] On Behalf Of Paolo Bonzini
>>>> On 24/01/2017 08:17, Pavel Dovgalyuk wrote:
>>>>> This patch implements saving/restoring of static apic_delivered variable.
>>>>>
>>>>> Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
>>>>> ---
>>>>>  hw/intc/apic_common.c           |   32 ++++++++++++++++++++++++++++++++
>>>>>  include/hw/i386/apic_internal.h |    2 ++
>>>>>  2 files changed, 34 insertions(+)
>>>>>
>>>>> diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
>>>>> index d78c885..ac6cc67 100644
>>>>> --- a/hw/intc/apic_common.c
>>>>> +++ b/hw/intc/apic_common.c
>>>>> @@ -384,6 +384,24 @@ static bool apic_common_sipi_needed(void *opaque)
>>>>>      return s->wait_for_sipi != 0;
>>>>>  }
>>>>>
>>>>> +static bool apic_irq_delivered_needed(void *opaque)
>>>>> +{
>>>>> +    return true;
>>>>
>>>> Is it needed for CPUs except the first (or the last?)?
>>>>
>>>
>>> As this is global variable, it is needed only for one CPU.
>>> Do you mean that APIC state is saved for every CPU?
>>
>> Yes, each CPU has its own APIC.
> 
> How to link this data to a single CPU?

Since it's global, you only need to migrate it once.  You're migrating
the same value many times.

Paolo