thr3ads.net - Linux Virtualization - [PATCH V9 1/9] vhost: refine vhost and vringh kconfig [Apr 2020]

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Christian Borntraeger

2020-Apr-01 11:21 UTC

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

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). 
> 
> While at it, also squash Kconfig.vringh into vhost Kconfig file. This
> avoids the trick of conditional inclusion from VOP or CAIF. Then it
> will be easier to introduce new vringh users and common dependency for
> both vringh and vhost.
> 
> Signed-off-by: Jason Wang <jasowang at redhat.com>
> ---
>  arch/arm/kvm/Kconfig         |  2 --
>  arch/arm64/kvm/Kconfig       |  2 --
>  arch/mips/kvm/Kconfig        |  2 --
>  arch/powerpc/kvm/Kconfig     |  2 --
>  arch/s390/kvm/Kconfig        |  4 ----
>  arch/x86/kvm/Kconfig         |  4 ----
>  drivers/Kconfig              |  2 ++
>  drivers/misc/mic/Kconfig     |  4 ----
>  drivers/net/caif/Kconfig     |  4 ----
>  drivers/vhost/Kconfig        | 23 ++++++++++++++---------
>  drivers/vhost/Kconfig.vringh |  6 ------
>  11 files changed, 16 insertions(+), 39 deletions(-)
>  delete mode 100644 drivers/vhost/Kconfig.vringh
> 
> diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
> index f591026347a5..be97393761bf 100644
> --- a/arch/arm/kvm/Kconfig
> +++ b/arch/arm/kvm/Kconfig
> @@ -54,6 +54,4 @@ config KVM_ARM_HOST
>  	---help---
>  	  Provides host support for ARM processors.
>  
> -source "drivers/vhost/Kconfig"
> -
>  endif # VIRTUALIZATION
> diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
> index a475c68cbfec..449386d76441 100644
> --- a/arch/arm64/kvm/Kconfig
> +++ b/arch/arm64/kvm/Kconfig
> @@ -64,6 +64,4 @@ config KVM_ARM_PMU
>  config KVM_INDIRECT_VECTORS
>         def_bool KVM && (HARDEN_BRANCH_PREDICTOR ||
HARDEN_EL2_VECTORS)
>  
> -source "drivers/vhost/Kconfig"
> -
>  endif # VIRTUALIZATION
> diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig
> index eac25aef21e0..b91d145aa2d5 100644
> --- a/arch/mips/kvm/Kconfig
> +++ b/arch/mips/kvm/Kconfig
> @@ -72,6 +72,4 @@ config KVM_MIPS_DEBUG_COP0_COUNTERS
>  
>  	  If unsure, say N.
>  
> -source "drivers/vhost/Kconfig"
> -
>  endif # VIRTUALIZATION
> diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
> index 711fca9bc6f0..12885eda324e 100644
> --- a/arch/powerpc/kvm/Kconfig
> +++ b/arch/powerpc/kvm/Kconfig
> @@ -204,6 +204,4 @@ config KVM_XIVE
>  	default y
>  	depends on KVM_XICS && PPC_XIVE_NATIVE &&
KVM_BOOK3S_HV_POSSIBLE
>  
> -source "drivers/vhost/Kconfig"
> -
>  endif # VIRTUALIZATION
> diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
> index d3db3d7ed077..def3b60f1fe8 100644
> --- a/arch/s390/kvm/Kconfig
> +++ b/arch/s390/kvm/Kconfig
> @@ -55,8 +55,4 @@ config KVM_S390_UCONTROL
>  
>  	  If unsure, say N.
>  
> -# OK, it's a little counter-intuitive to do this, but it puts it
neatly under
> -# the virtualization menu.
> -source "drivers/vhost/Kconfig"
> -
>  endif # VIRTUALIZATION
> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> index 991019d5eee1..0dfe70e17af9 100644
> --- a/arch/x86/kvm/Kconfig
> +++ b/arch/x86/kvm/Kconfig
> @@ -94,8 +94,4 @@ config KVM_MMU_AUDIT
>  	 This option adds a R/W kVM module parameter 'mmu_audit', which
allows
>  	 auditing of KVM MMU events at runtime.
>  
> -# OK, it's a little counter-intuitive to do this, but it puts it
neatly under
> -# the virtualization menu.
> -source "drivers/vhost/Kconfig"
> -
>  endif # VIRTUALIZATION
> diff --git a/drivers/Kconfig b/drivers/Kconfig
> index 8befa53f43be..7a6d8b2b68b4 100644
> --- a/drivers/Kconfig
> +++ b/drivers/Kconfig
> @@ -138,6 +138,8 @@ source "drivers/virt/Kconfig"
>  
>  source "drivers/virtio/Kconfig"
>  
> +source "drivers/vhost/Kconfig"
> +
>  source "drivers/hv/Kconfig"
>  
>  source "drivers/xen/Kconfig"
> diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig
> index b6841ba6d922..8f201d019f5a 100644
> --- a/drivers/misc/mic/Kconfig
> +++ b/drivers/misc/mic/Kconfig
> @@ -133,8 +133,4 @@ config VOP
>  	  OS and tools for MIC to use with this driver are available from
>  	  <http://software.intel.com/en-us/mic-developer>.
>  
> -if VOP
> -source "drivers/vhost/Kconfig.vringh"
> -endif
> -
>  endmenu
> diff --git a/drivers/net/caif/Kconfig b/drivers/net/caif/Kconfig
> index e74e2bb61236..9db0570c5beb 100644
> --- a/drivers/net/caif/Kconfig
> +++ b/drivers/net/caif/Kconfig
> @@ -58,8 +58,4 @@ config CAIF_VIRTIO
>  	---help---
>  	  The CAIF driver for CAIF over Virtio.
>  
> -if CAIF_VIRTIO
> -source "drivers/vhost/Kconfig.vringh"
> -endif
> -
>  endif # CAIF_DRIVERS
> diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
> index 3d03ccbd1adc..4aef10a54cd1 100644
> --- a/drivers/vhost/Kconfig
> +++ b/drivers/vhost/Kconfig
> @@ -1,8 +1,20 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> +config VHOST_RING
> +	tristate
> +	help
> +	  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)"
> +	help
> +	  This option is selected by any driver which needs to access
> +	  the core of vhost.
> +if VHOST
> +
>  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
> @@ -14,7 +26,6 @@ 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
> @@ -24,7 +35,6 @@ config VHOST_VSOCK
>  	tristate "vhost virtio-vsock driver"
>  	depends on VSOCKETS && EVENTFD
>  	select VIRTIO_VSOCKETS_COMMON
> -	select VHOST
>  	default n
>  	---help---
>  	This kernel module can be loaded in the host kernel to provide AF_VSOCK
> @@ -34,12 +44,6 @@ config VHOST_VSOCK
>  	To compile this driver as a module, choose M here: the module will be
called
>  	vhost_vsock.
>  
> -config VHOST
> -	tristate
> -	---help---
> -	  This option is selected by any driver which needs to access
> -	  the core of vhost.
> -
>  config VHOST_CROSS_ENDIAN_LEGACY
>  	bool "Cross-endian support for vhost"
>  	default n
> @@ -54,3 +58,4 @@ config VHOST_CROSS_ENDIAN_LEGACY
>  	  adds some overhead, it is disabled by default.
>  
>  	  If unsure, say "N".
> +endif
> diff --git a/drivers/vhost/Kconfig.vringh b/drivers/vhost/Kconfig.vringh
> deleted file mode 100644
> index c1fe36a9b8d4..000000000000
> --- a/drivers/vhost/Kconfig.vringh
> +++ /dev/null
> @@ -1,6 +0,0 @@
> -# SPDX-License-Identifier: GPL-2.0-only
> -config VHOST_RING
> -	tristate
> -	---help---
> -	  This option is selected by any driver which needs to access
> -	  the host side of a virtio ring.
>

Jason Wang

2020-Apr-01 12:50 UTC

head link

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

On 2020/4/1 ??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?

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

Thanks

Christian Borntraeger

2020-Apr-01 12:56 UTC

head link

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

On 01.04.20 14:50, Jason Wang wrote:> 
> On 2020/4/1 ??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
>

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