Re: [RFC v2 07/22] hw/pci: introduce pci_device_iommu_context()

[David Gibson <david@gibson.dropbear.id.au>]

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On Thu, Oct 24, 2019 at 08:34:28AM -0400, Liu Yi L wrote:
> This patch adds pci_device_iommu_context() to get an iommu_context
> for a given device. A new callback is added in PCIIOMMUOps. Users
> who wants to listen to events issued by vIOMMU could use this new
> interface to get an iommu_context and register their own notifiers,
> then wait for notifications from vIOMMU. e.g. VFIO is the first user
> of it to listen to the PASID_ALLOC/PASID_BIND/CACHE_INV events and
> propagate the events to host.
> 
> Cc: Kevin Tian <kevin.tian@intel.com>
> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
> Cc: Peter Xu <peterx@redhat.com>
> Cc: Eric Auger <eric.auger@redhat.com>
> Cc: Yi Sun <yi.y.sun@linux.intel.com>
> Cc: David Gibson <david@gibson.dropbear.id.au>
> Signed-off-by: Liu Yi L <yi.l.liu@intel.com>

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

> ---
>  hw/pci/pci.c         | 16 ++++++++++++++++
>  include/hw/pci/pci.h |  5 +++++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index b5ce9ca..4e6af06 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -2625,6 +2625,22 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev)
>      return &address_space_memory;
>  }
>  
> +IOMMUContext *pci_device_iommu_context(PCIDevice *dev)
> +{
> +    PCIBus *bus = pci_get_bus(dev);
> +    PCIBus *iommu_bus = bus;
> +
> +    while (iommu_bus && !iommu_bus->iommu_ops && iommu_bus->parent_dev) {
> +        iommu_bus = pci_get_bus(iommu_bus->parent_dev);
> +    }
> +    if (iommu_bus && iommu_bus->iommu_ops &&
> +        iommu_bus->iommu_ops->get_iommu_context) {
> +        return iommu_bus->iommu_ops->get_iommu_context(bus,
> +                           iommu_bus->iommu_opaque, dev->devfn);
> +    }
> +    return NULL;
> +}
> +
>  void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *ops, void *opaque)
>  {
>      bus->iommu_ops = ops;
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index d9fed8d..ccada47 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -9,6 +9,8 @@
>  
>  #include "hw/pci/pcie.h"
>  
> +#include "hw/iommu/iommu.h"
> +
>  extern bool pci_available;
>  
>  /* PCI bus */
> @@ -484,9 +486,12 @@ typedef struct PCIIOMMUOps PCIIOMMUOps;
>  struct PCIIOMMUOps {
>      AddressSpace * (*get_address_space)(PCIBus *bus,
>                                  void *opaque, int32_t devfn);
> +    IOMMUContext * (*get_iommu_context)(PCIBus *bus,
> +                                void *opaque, int32_t devfn);
>  };
>  
>  AddressSpace *pci_device_iommu_address_space(PCIDevice *dev);
> +IOMMUContext *pci_device_iommu_context(PCIDevice *dev);
>  void pci_setup_iommu(PCIBus *bus, const PCIIOMMUOps *iommu_ops, void *opaque);
>  
>  static inline void

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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