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

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Date:   Wed, 1 Apr 2020 12:05:39 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...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 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.


OK so don't we need the dependency on EVENTFD though?
I recall there was a bug this was supposed to fix ...


> -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
>  	select VDPA
>  	help
>  	  This kernel module can be loaded in host kernel to accelerate
> -- 
> 2.20.1
>