Re: [PATCH v3 01/15] hw/pci: Refactor pci_device_iommu_address_space()

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Hi Joao,

On 30/5/23 19:59, Joao Martins wrote:
> Rename pci_device_iommu_address_space() into pci_device_iommu_info().
> In the new function return a new type PCIAddressSpace that encapsulates
> the AddressSpace pointer that originally was returned.
> 
> The new type is added in preparation to expanding it to include the IOMMU
> memory region as a new field, such that we are able to fetch attributes of
> the vIOMMU e.g. at vfio migration setup.
> 
> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
> ---
>   hw/pci/pci.c         |  9 ++++++---
>   include/hw/pci/pci.h | 21 ++++++++++++++++++++-

Please consider using scripts/git.orderfile.

>   2 files changed, 26 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 1cc7c89036b5..ecf8a543aa77 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -2633,11 +2633,12 @@ static void pci_device_class_base_init(ObjectClass *klass, void *data)
>       }
>   }
>   
> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> +PCIAddressSpace pci_device_iommu_info(PCIDevice *dev)
>   {

This function is PCI specific, ...

>   }
>   
>   void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque)
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index e6d0574a2999..9ffaf47fe2ab 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -363,9 +363,28 @@ void pci_bus_get_w64_range(PCIBus *bus, Range *range);
>   
>   void pci_device_deassert_intx(PCIDevice *dev);
>   
> +typedef struct PCIAddressSpace {
> +    AddressSpace *as;

... but here I fail to understand what is PCI specific in this
structure. You are just trying to an AS with a IOMMU MR, right?

> +} PCIAddressSpace;
> +
>   typedef AddressSpace *(*PCIIOMMUFunc)(PCIBus *, void *, int);
> +static inline PCIAddressSpace as_to_pci_as(AddressSpace *as)
> +{
> +    PCIAddressSpace ret = { .as = as };
> +
> +    return ret;
> +}
> +static inline AddressSpace *pci_as_to_as(PCIAddressSpace pci_as)
> +{
> +    return pci_as.as;
> +}
> +
> +PCIAddressSpace pci_device_iommu_info(PCIDevice *dev);
> +static inline AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
> +{
> +    return pci_as_to_as(pci_device_iommu_info(dev));
> +}
>   
> -AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
>   void pci_setup_iommu(PCIBus *bus, PCIIOMMUFunc fn, void *opaque);
>   
>   pcibus_t pci_bar_address(PCIDevice *d,