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

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Message-ID: <279ed96c-5331-9da6-f9c1-b49e87d49c31@redhat.com>
Date:   Thu, 2 Apr 2020 22:23:59 +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10:03, 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


>