Re: [PATCH v4 02/15] hw/pci: Refactor pci_device_iommu_address_space()

[Joao Martins <joao.m.martins@oracle.com>]

On 02/10/2023 16:22, Cédric Le Goater wrote:
> On 6/22/23 23:48, Joao Martins wrote:
>> From: Yi Liu <yi.l.liu@intel.com>
>>
>> Refactor pci_device_iommu_address_space() and move the
>> code that fetches the device bus and iommu bus into its
>> own private helper pci_device_get_iommu_bus_devfn().
>>
>> This is in preparation to introduce pci_device_iommu_get_attr()
>> which will need to use it too.
> 
> Where is this routine used ?
> 

Patch 7 to understand if a configured vIOMMU supports DMA translation,
regardless of whether the guest is doing.

> Thanks,
> 
> C.
> 
> 
>>
>> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
>> [joao: Commit message, and better splitting]
>> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
>> ---
>> Splitted from v1:
>> https://lore.kernel.org/all/20210302203827.437645-6-yi.l.liu@intel.com/
>> ---
>>   hw/pci/pci.c | 16 ++++++++++++++--
>>   1 file changed, 14 insertions(+), 2 deletions(-)
>>
>> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
>> index 4e32c09e81d6..90ae92a43d85 100644
>> --- a/hw/pci/pci.c
>> +++ b/hw/pci/pci.c
>> @@ -2632,8 +2632,8 @@ static void pci_device_class_base_init(ObjectClass
>> *klass, void *data)
>>           assert(conventional || pcie || cxl);
>>       }
>>   }
>> -
>> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>> +static void pci_device_get_iommu_bus_devfn(PCIDevice *dev, PCIBus **pdevbus,
>> +                                           PCIBus **pbus, uint8_t *pdevfn)
>>   {
>>       PCIBus *bus = pci_get_bus(dev);
>>       PCIBus *iommu_bus = bus;
>> @@ -2686,6 +2686,18 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice
>> *dev)
>>             iommu_bus = parent_bus;
>>       }
>> +
>> +    *pdevbus = bus;
>> +    *pbus = iommu_bus;
>> +    *pdevfn = devfn;
>> +}
>> +
>> +AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>> +{
>> +    PCIBus *bus, *iommu_bus;
>> +    uint8_t devfn;
>> +
>> +    pci_device_get_iommu_bus_devfn(dev, &bus, &iommu_bus, &devfn);
>>       if (!pci_bus_bypass_iommu(bus) && iommu_bus) {
>>           if (iommu_bus->iommu_fn) {
>>              return iommu_bus->iommu_fn(bus, iommu_bus->iommu_opaque, devfn);
>