linux-kernel - Re: [PATCH V3 16/19] virtio-pci: introduce modern device module

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Message-ID: <20210209091916-mutt-send-email-mst@kernel.org>
Date:   Tue, 9 Feb 2021 09:20:36 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, shahafs@...lanox.com,
        lulu@...hat.com, sgarzare@...hat.com, rdunlap@...radead.org
Subject: Re: [PATCH V3 16/19] virtio-pci: introduce modern device module

On Mon, Jan 04, 2021 at 02:55:00PM +0800, Jason Wang wrote:
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  drivers/virtio/Kconfig                 |  10 +-
>  drivers/virtio/Makefile                |   1 +
>  drivers/virtio/virtio_pci_common.h     |  27 +-
>  drivers/virtio/virtio_pci_modern.c     | 617 -------------------------
>  drivers/virtio/virtio_pci_modern_dev.c | 599 ++++++++++++++++++++++++
>  include/linux/virtio_pci_modern.h      | 111 +++++
>  6 files changed, 721 insertions(+), 644 deletions(-)
>  create mode 100644 drivers/virtio/virtio_pci_modern_dev.c
>  create mode 100644 include/linux/virtio_pci_modern.h
> 
> diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
> index 7b41130d3f35..6b9b81f4b8c2 100644
> --- a/drivers/virtio/Kconfig
> +++ b/drivers/virtio/Kconfig
> @@ -12,6 +12,14 @@ config ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
>  	  This option is selected if the architecture may need to enforce
>  	  VIRTIO_F_ACCESS_PLATFORM
>  
> +config VIRTIO_PCI_MODERN
> +	tristate "Modern Virtio PCI Device"
> +	depends on PCI
> +	help
> +	  Modern PCI device implementation. This module implements the
> +	  basic probe and control for devices which are based on modern
> +	  PCI device with possible vendor specific extensions.
> +
>  menuconfig VIRTIO_MENU
>  	bool "Virtio drivers"
>  	default y
> @@ -20,7 +28,7 @@ if VIRTIO_MENU
>  
>  config VIRTIO_PCI
>  	tristate "PCI driver for virtio devices"
> -	depends on PCI
> +	depends on VIRTIO_PCI_MODERN
>  	select VIRTIO
>  	help
>  	  This driver provides support for virtio based paravirtual device

Looks like VIRTIO_PCI_MODERN is actually just a library that
virtio pci uses. Is that right? In that case just select it
automatically, let's not make users enable it manually.

-- 
MST