Re: [PATCH] vfio/qat: extend Kconfig dependencies for 420xx and 6xxx devices

[Alex Williamson <alex@shazbot.org>]

On Fri, 13 Feb 2026 09:14:03 +0000
Suman Kumar Chakraborty <suman.kumar.chakraborty@intel.com> wrote:

> From: Vijay Sundar Selvamani <vijay.sundar.selvamani@intel.com>
> 
> Currently, the QAT VFIO PCI driver can only be configured when the 4xxx
> QAT driver (CRYPTO_DEV_QAT_4XXX) is enabled. This is too restrictive as
> the VFIO driver also supports VFs from the 420xx and 6xxx device
> families, which share a compatible migration interface.
> 
> Extends the Kconfig dependencies to allow configuration when any of the
> supported QAT device families (4xxx, 420xx, or 6xxx) are enabled.

420xx seems to be device ID 0x4947:

drivers/crypto/intel/qat/qat_common/adf_accel_devices.h
#define PCI_DEVICE_ID_INTEL_QAT_420XXIOV 0x4947

We don't currently have that in the ID table for the vfio qat driver:

static const struct pci_device_id qat_vf_vfio_pci_table[] = {
        /* Intel QAT GEN4 4xxx VF device */
        { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4941) },
        { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4943) },
        { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4945) },
        /* Intel QAT GEN6 6xxx VF device */
        { PCI_DRIVER_OVERRIDE_DEVICE_VFIO(PCI_VENDOR_ID_INTEL, 0x4949) },
        {}
};

Are we missing support for this device and is this Kconfig change
therefore a little overeager?  Thanks,

Alex

> Signed-off-by: Vijay Sundar Selvamani <vijay.sundar.selvamani@intel.com>
> Signed-off-by: Suman Kumar Chakraborty <suman.kumar.chakraborty@intel.com>
> Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
> ---
>  drivers/vfio/pci/qat/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/pci/qat/Kconfig b/drivers/vfio/pci/qat/Kconfig
> index bf52cfa4b595..83f037d7e9a4 100644
> --- a/drivers/vfio/pci/qat/Kconfig
> +++ b/drivers/vfio/pci/qat/Kconfig
> @@ -2,7 +2,7 @@
>  config QAT_VFIO_PCI
>  	tristate "VFIO support for QAT VF PCI devices"
>  	select VFIO_PCI_CORE
> -	depends on CRYPTO_DEV_QAT_4XXX
> +	depends on CRYPTO_DEV_QAT_4XXX || CRYPTO_DEV_QAT_420XX || CRYPTO_DEV_QAT_6XXX
>  	help
>  	  This provides migration support for Intel(R) QAT Virtual Function
>  	  using the VFIO framework.
> 
> base-commit: b10c62483b324e60e45fb27d7fdc09c9198993d7