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

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Date:   Wed, 1 Apr 2020 14:56:28 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Jason Wang <jasowang@...hat.com>, mst@...hat.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Cc:     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 01.04.20 14:50, Jason Wang wrote:
> 
> On 2020/4/1 下午7:21, Christian Borntraeger wrote:
>> On 26.03.20 15:01, Jason Wang wrote:
>>> Currently, CONFIG_VHOST depends on CONFIG_VIRTUALIZATION. But vhost is
>>> not necessarily for VM since it's a generic userspace and kernel
>>> communication protocol. Such dependency may prevent archs without
>>> virtualization support from using vhost.
>>>
>>> To solve this, a dedicated vhost menu is created under drivers so
>>> CONIFG_VHOST can be decoupled out of CONFIG_VIRTUALIZATION.
>> FWIW, this now results in vhost not being build with defconfig kernels (in todays
>> linux-next).
>>
> 
> Hi Christian:
> 
> Did you meet it even with this commit https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=a4be40cbcedba9b5b714f3c95182e8a45176e42d?

I simply used linux-next. The defconfig does NOT contain CONFIG_VHOST and therefore CONFIG_VHOST_NET and friends
can not be selected.

$ git checkout next-20200401
$ make defconfig
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  HOSTCC  scripts/kconfig/confdata.o
  HOSTCC  scripts/kconfig/expr.o
  LEX     scripts/kconfig/lexer.lex.c
  YACC    scripts/kconfig/parser.tab.[ch]
  HOSTCC  scripts/kconfig/lexer.lex.o
  HOSTCC  scripts/kconfig/parser.tab.o
  HOSTCC  scripts/kconfig/preprocess.o
  HOSTCC  scripts/kconfig/symbol.o
  HOSTCC  scripts/kconfig/util.o
  HOSTLD  scripts/kconfig/conf
*** Default configuration is based on 'x86_64_defconfig'
#
# configuration written to .config
#

$ grep VHOST .config
# CONFIG_VHOST is not set

 
> If yes, what's your build config looks like?
> 
> Thanks
>