netdev - Re: [PATCH V9 1/9] vhost: refine vhost and vringh kconfig

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Date:   Thu, 2 Apr 2020 22:56:45 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        jgg@...lanox.com, maxime.coquelin@...hat.com,
        cunming.liang@...el.com, zhihong.wang@...el.com,
        rob.miller@...adcom.com, xiao.w.wang@...el.com,
        lingshan.zhu@...el.com, eperezma@...hat.com, lulu@...hat.com,
        parav@...lanox.com, kevin.tian@...el.com, stefanha@...hat.com,
        rdunlap@...radead.org, hch@...radead.org, aadam@...hat.com,
        jiri@...lanox.com, shahafs@...lanox.com, hanand@...inx.com,
        mhabets@...arflare.com, gdawar@...inx.com, saugatm@...inx.com,
        vmireyno@...vell.com, zhangweining@...jie.com.cn
Subject: Re: [PATCH V9 1/9] vhost: refine vhost and vringh kconfig


On 2020/4/2 下午10:38, Michael S. Tsirkin wrote:
> On Thu, Apr 02, 2020 at 10:23:59PM +0800, Jason Wang wrote:
>> On 2020/4/2 下午10:03, Michael S. Tsirkin wrote:
>>> On Thu, Apr 02, 2020 at 11:22:57AM +0800, Jason Wang wrote:
>>>> On 2020/4/2 上午12:08, Michael S. Tsirkin wrote:
>>>>> On Wed, Apr 01, 2020 at 10:29:32PM +0800, Jason Wang wrote:
>>>>>> >From 9b3a5d23b8bf6b0a11e65e688335d782f8e6aa5c Mon Sep 17 00:00:00 2001
>>>>>> From: Jason Wang <jasowang@...hat.com>
>>>>>> Date: Wed, 1 Apr 2020 22:17:27 +0800
>>>>>> Subject: [PATCH] vhost: let CONFIG_VHOST to be selected by drivers
>>>>>>
>>>>>> The defconfig on some archs enable vhost_net or vhost_vsock by
>>>>>> default. So instead of adding CONFIG_VHOST=m to all of those files,
>>>>>> simply letting CONFIG_VHOST to be selected by all of the vhost
>>>>>> drivers. This fixes the build on the archs with CONFIG_VHOST_NET=m in
>>>>>> their defconfig.
>>>>>>
>>>>>> Signed-off-by: Jason Wang <jasowang@...hat.com>
>>>>>> ---
>>>>>>     drivers/vhost/Kconfig | 15 +++++++++++----
>>>>>>     1 file changed, 11 insertions(+), 4 deletions(-)
>>>>>>
>>>>>> diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
>>>>>> index 2523a1d4290a..362b832f5338 100644
>>>>>> --- a/drivers/vhost/Kconfig
>>>>>> +++ b/drivers/vhost/Kconfig
>>>>>> @@ -11,19 +11,23 @@ config VHOST_RING
>>>>>>     	  This option is selected by any driver which needs to access
>>>>>>     	  the host side of a virtio ring.
>>>>>> -menuconfig VHOST
>>>>>> -	tristate "Host kernel accelerator for virtio (VHOST)"
>>>>>> -	depends on EVENTFD
>>>>>> +config VHOST
>>>>>> +	tristate
>>>>>>     	select VHOST_IOTLB
>>>>>>     	help
>>>>>>     	  This option is selected by any driver which needs to access
>>>>>>     	  the core of vhost.
>>>>>> -if VHOST
>>>>>> +menuconfig VHOST_MENU
>>>>>> +	bool "VHOST drivers"
>>>>>> +	default y
>>>>>> +
>>>>>> +if VHOST_MENU
>>>>>>     config VHOST_NET
>>>>>>     	tristate "Host kernel accelerator for virtio net"
>>>>>>     	depends on NET && EVENTFD && (TUN || !TUN) && (TAP || !TAP)
>>>>>> +	select VHOST
>>>>>>     	---help---
>>>>>>     	  This kernel module can be loaded in host kernel to accelerate
>>>>>>     	  guest networking with virtio_net. Not to be confused with virtio_net
>>>>>> @@ -35,6 +39,7 @@ config VHOST_NET
>>>>>>     config VHOST_SCSI
>>>>>>     	tristate "VHOST_SCSI TCM fabric driver"
>>>>>>     	depends on TARGET_CORE && EVENTFD
>>>>>> +	select VHOST
>>>>>>     	default n
>>>>>>     	---help---
>>>>>>     	Say M here to enable the vhost_scsi TCM fabric module
>>>>>> @@ -43,6 +48,7 @@ config VHOST_SCSI
>>>>>>     config VHOST_VSOCK
>>>>>>     	tristate "vhost virtio-vsock driver"
>>>>>>     	depends on VSOCKETS && EVENTFD
>>>>>> +	select VHOST
>>>>>>     	select VIRTIO_VSOCKETS_COMMON
>>>>>>     	default n
>>>>>>     	---help---
>>>>>> @@ -56,6 +62,7 @@ config VHOST_VSOCK
>>>>>>     config VHOST_VDPA
>>>>>>     	tristate "Vhost driver for vDPA-based backend"
>>>>>>     	depends on EVENTFD
>>>>>> +	select VHOST
>>>> This part is not squashed.
>>>>
>>>>
>>>>>>     	select VDPA
>>>>>>     	help
>>>>>>     	  This kernel module can be loaded in host kernel to accelerate
>>>>> OK so I squashed this into the original buggy patch.
>>>>> Could you please play with vhost branch of my tree on various
>>>>> arches? If it looks ok to you let me know I'll push
>>>>> this to next.
>>>> With the above part squashed. I've tested all the archs whose defconfig have
>>>> VHOST_NET or VHOST_VSOCK enabled.
>>>>
>>>> All looks fine.
>>>>
>>>> Thanks
>>> I'm a bit confused. So is the next tag in my tree ok now?
>>
>> Still need to select CONFIG_VHOST for  CONFIG_VHOST_VDPA. Others are ok.
>>
>> Thanks
>
> Oh like this then?
>
> diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
> index bdd270fede26..cb6b17323eb2 100644
> --- a/drivers/vhost/Kconfig
> +++ b/drivers/vhost/Kconfig
> @@ -61,6 +63,7 @@ config VHOST_VSOCK
>   config VHOST_VDPA
>   	tristate "Vhost driver for vDPA-based backend"
>   	depends on EVENTFD
> +	select VHOST
>   	select VDPA
>   	help
>   	  This kernel module can be loaded in host kernel to accelerate


Yes.

Thanks


>