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

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Date:   Thu, 18 Feb 2021 13:49:59 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...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 2021/2/10 下午8:35, Michael S. Tsirkin wrote:
> On Wed, Feb 10, 2021 at 12:44:03PM +0800, Jason Wang wrote:
>> On 2021/2/9 下午10:20, Michael S. Tsirkin wrote:
>>> 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?
>>
>> Right.
>>
>>
>>> In that case just select it
>>> automatically, let's not make users enable it manually.
>>
>> I've considered to do this but the problem is that the module depends on PCI
>> so it can't be selected I think.
> Drop the dependency, document that whoever selects it must depend on PCI.


Fine with me. Will post a patch.

Thanks


>
>> Thanks
>>
>>