Re: [Qemu-devel] [PATCH 08/17] pseries: savevm support for PAPR TCE tables

[Paolo Bonzini <pbonzini@redhat.com>]

Il 08/07/2013 20:39, Anthony Liguori ha scritto:
> Alexey Kardashevskiy <aik@ozlabs.ru> writes:
> 
>> From: David Gibson <david@gibson.dropbear.id.au>
>>
>> This patch adds the necessary VMStateDescription information to save the
>> state of PAPR TCE tables (that is, the PAPR specified IOMMU).
>>
>> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
>> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
>> ---
>>  hw/ppc/spapr_iommu.c |   25 +++++++++++++++++++++++++
>>  1 file changed, 25 insertions(+)
>>
>> diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c
>> index 91bc8e4..ba1f7b6 100644
>> --- a/hw/ppc/spapr_iommu.c
>> +++ b/hw/ppc/spapr_iommu.c
>> @@ -112,6 +112,25 @@ static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr)
>>      };
>>  }
>>  
>> +static const VMStateDescription vmstate_spapr_tce_table = {
>> +    .name = "spapr_iommu",
>> +    .version_id = 1,
>> +    .minimum_version_id = 1,
>> +    .minimum_version_id_old = 1,
>> +    .fields      = (VMStateField []) {
>> +        /* Sanity check */
>> +        VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
>> +        VMSTATE_UINT32_EQUAL(window_size, sPAPRTCETable),
>> +
>> +        /* IOMMU state */
>> +        VMSTATE_BOOL(bypass, sPAPRTCETable),
>> +        VMSTATE_VBUFFER_DIVIDE(table, sPAPRTCETable, 0, NULL, 0, window_size,
>> +                               SPAPR_TCE_PAGE_SIZE /
>> sizeof(sPAPRTCE)),
> 
> Not endian safe.  I really don't get the divide bit at all either.
> 
>> +
>> +        VMSTATE_END_OF_LIST()
>> +    },
>> +};
>> +
>>  static MemoryRegionIOMMUOps spapr_iommu_ops = {
>>      .translate = spapr_tce_translate_iommu,
>>  };
>> @@ -156,6 +175,8 @@ sPAPRTCETable *spapr_tce_new_table(uint32_t liobn, size_t window_size)
>>  
>>      QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
>>  
>> +    vmstate_register(NULL, tcet->liobn, &vmstate_spapr_tce_table, tcet);
>> +
> 
> If you need to add these, then you need to do more QOM conversion.

No, this does not need QOM conversion.  It needs a sub-vmstate, that is
then used by both the PCI and VIO bridges via VMSTATE_STRUCT.

Paolo

> Regards,
> 
> Anthony Liguori
> 
>>      return tcet;
>>  }
>>  
>> @@ -163,6 +184,10 @@ void spapr_tce_free(sPAPRTCETable *tcet)
>>  {
>>      QLIST_REMOVE(tcet, list);
>>  
>> +    vmstate_unregister(NULL, &vmstate_spapr_tce_table, tcet);
>> +
>> +    QLIST_REMOVE(tcet, list);
>> +
>>      if (!kvm_enabled() ||
>>          (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
>>                                   tcet->window_size) != 0)) {
>> -- 
>> 1.7.10.4
>