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

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Date:   Wed, 10 Feb 2021 12:44:03 +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 2021/2/9 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.

Thanks


>