Re: [PATCH RFC 04/19] vfio-user: Define type vfio_user_pci_dev_info

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Sun, Jul 18, 2021 at 11:27:43PM -0700, Elena Ufimtseva wrote:
> From: John G Johnson <john.g.johnson@oracle.com>
> 
> New class for vfio-user with its class and instance
> constructors and destructors.
> 
> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
> Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
> Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
> ---
>  hw/vfio/pci.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
> 
> diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
> index bea95efc33..554b562769 100644
> --- a/hw/vfio/pci.c
> +++ b/hw/vfio/pci.c
> @@ -42,6 +42,7 @@
>  #include "qapi/error.h"
>  #include "migration/blocker.h"
>  #include "migration/qemu-file.h"
> +#include "hw/vfio/user.h"
>  
>  #define TYPE_VFIO_PCI_NOHOTPLUG "vfio-pci-nohotplug"
>  
> @@ -3326,3 +3327,51 @@ static void register_vfio_pci_dev_type(void)
>  }
>  
>  type_init(register_vfio_pci_dev_type)
> +
> +static void vfio_user_pci_realize(PCIDevice *pdev, Error **errp)
> +{
> +    ERRP_GUARD();
> +    VFIOUserPCIDevice *udev = VFIO_USER_PCI(pdev);
> +
> +    if (!udev->sock_name) {
> +        error_setg(errp, "No socket specified");
> +        error_append_hint(errp, "Use -device vfio-user-pci,socket=<name>\n");
> +        return;
> +    }
> +}
> +
> +static void vfio_user_instance_finalize(Object *obj)
> +{
> +}
> +
> +static Property vfio_user_pci_dev_properties[] = {
> +    DEFINE_PROP_STRING("socket", VFIOUserPCIDevice, sock_name),

Please use SocketAddress so that alternative socket connection details
can be supported without inventing custom syntax for vfio-user-pci. For
example, file descriptor passing should be possible.

I think this requires a bit of command-line parsing work, so don't worry
about it for now, but please add a TODO comment. When the -device
vfio-user-pci syntax is finalized (i.e. when the code is merged and the
device name doesn't start with the experimental x- prefix), then it
needs to be solved.

> +    DEFINE_PROP_BOOL("secure-dma", VFIOUserPCIDevice, secure, false),

I'm not sure what "secure-dma" means and the "secure" variable name is
even more inscrutable. Does this mean don't share memory so that each
DMA access is checked individually?

> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static void vfio_user_pci_dev_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    PCIDeviceClass *pdc = PCI_DEVICE_CLASS(klass);
> +
> +    device_class_set_props(dc, vfio_user_pci_dev_properties);
> +    dc->desc = "VFIO over socket PCI device assignment";
> +    pdc->realize = vfio_user_pci_realize;
> +}
> +
> +static const TypeInfo vfio_user_pci_dev_info = {
> +    .name = TYPE_VFIO_USER_PCI,
> +    .parent = TYPE_VFIO_PCI_BASE,
> +    .instance_size = sizeof(VFIOUserPCIDevice),
> +    .class_init = vfio_user_pci_dev_class_init,
> +    .instance_init = vfio_instance_init,
> +    .instance_finalize = vfio_user_instance_finalize,
> +};
> +
> +static void register_vfio_user_dev_type(void)
> +{
> +    type_register_static(&vfio_user_pci_dev_info);
> +}
> +
> +type_init(register_vfio_user_dev_type)
> -- 
> 2.25.1
> 

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