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

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Message-ID: <12f0ff8f-cdf2-9aac-883c-48c39138b7ea@redhat.com>
Date:   Wed, 1 Apr 2020 22:43:56 +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 2020/4/1 下午10:39, Michael S. Tsirkin 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
> In fact this is similar to VIRTIO, and I wonder whether VIRTIO has also
> been broken by
> 	commit 7b95fec6d2ffa53f4a8d637b0f223644d458ea4e
> 	Author: Vincent Legoll<vincent.legoll@...il.com>
> 	Date:   Sun Jan 7 12:33:56 2018 +0100
>
> 	    virtio: make VIRTIO a menuconfig to ease disabling it all
>
> I see lots of defconfigs set VIRTIO_PCI but not VIRTIO_MENU ...


Probably not since VIRTIO_MENU has "default y"

E.g for powerpc, I got:

# make ARCH=powerpc defconfig
*** Default configuration is based on 'ppc64_defconfig'
#
# No change to .config
#
# grep CONFIG_VIRTIO .config
CONFIG_VIRTIO_BLK=m
CONFIG_VIRTIO_NET=m
CONFIG_VIRTIO_CONSOLE=m
CONFIG_VIRTIO=m
CONFIG_VIRTIO_MENU=y
CONFIG_VIRTIO_PCI=m
CONFIG_VIRTIO_PCI_LEGACY=y
# CONFIG_VIRTIO_VDPA is not set
CONFIG_VIRTIO_BALLOON=m
# CONFIG_VIRTIO_INPUT is not set
# CONFIG_VIRTIO_MMIO is not set
# CONFIG_VIRTIO_FS is not set

Thanks