Re: [Qemu-devel] [PATCH 1/2] vfio-pci: add flag to identify vfio pci device

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On 03/26/2015 05:42 PM, Nikunj A Dadhania wrote:
>  From PCIDevice there is no way to know if the device has a backing
> vfio device.
>
> sPAPR guests inherits the "ibm,loc-code" from the pci pass through
> device in hypervisor. This helps in identifying the device if there is
> any failures using this "ibm,loc-code" for RAS capabilities.

First, you can use object_dynamic_cast(OBJECT(obj), "vfio-pci") to know if 
it is a VFIO device.

Second, rather than adding this flag here, I would fix the second patch to 
check if PHB is of the TYPE_SPAPR_PCI_VFIO_HOST_BRIDGE type 
("spapr-pci-vfio-host-bridge"), using the same QOM mechanism.



> CC: Alex Williamson <alex.williamson@redhat.com>
> CC: Alexander Graf <agraf@suse.de>
> Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
> ---
>   hw/vfio/pci.c        | 2 ++
>   include/hw/pci/pci.h | 2 ++
>   2 files changed, 4 insertions(+)
>
> diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
> index 6b80539..95d666e 100644
> --- a/hw/vfio/pci.c
> +++ b/hw/vfio/pci.c
> @@ -3483,6 +3483,7 @@ static void vfio_instance_finalize(Object *obj)
>       VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pci_dev);
>       VFIOGroup *group = vdev->vbasedev.group;
>
> +    pci_dev->is_vfio = false;
>       vfio_unmap_bars(vdev);
>       g_free(vdev->emulated_config_bits);
>       g_free(vdev->rom);
> @@ -3542,6 +3543,7 @@ static void vfio_instance_init(Object *obj)
>       PCIDevice *pci_dev = PCI_DEVICE(obj);
>       VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, PCI_DEVICE(obj));
>
> +    pci_dev->is_vfio = true;
>       device_add_bootindex_property(obj, &vdev->bootindex,
>                                     "bootindex", NULL,
>                                     &pci_dev->qdev, NULL);
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index b97c295..0ddc830 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -291,6 +291,8 @@ struct PCIDevice {
>       /* SHPC */
>       SHPCDevice *shpc;
>
> +    bool is_vfio;
> +
>       /* Location of option rom */
>       char *romfile;
>       bool has_rom;
>


-- 
Alexey