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 12:56 UTC

[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
>

Christian Borntraeger

2020-Apr-01 13:02 UTC

head link

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

On 01.04.20 14:56, Christian Borntraeger wrote:> 
> 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
This was x86. Not sure if that did work before.
On s390 this is definitely a regression as the defconfig files 
for s390 do select VHOST_NET

grep VHOST arch/s390/configs/*
arch/s390/configs/debug_defconfig:CONFIG_VHOST_NET=m
arch/s390/configs/debug_defconfig:CONFIG_VHOST_VSOCK=m
arch/s390/configs/defconfig:CONFIG_VHOST_NET=m
arch/s390/configs/defconfig:CONFIG_VHOST_VSOCK=m

and this worked with 5.6, but does not work with next. Just adding
CONFIG_VHOST=m to the defconfig solves the issue, something like

---
 arch/s390/configs/debug_defconfig | 5 +++--
 arch/s390/configs/defconfig       | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/s390/configs/debug_defconfig
b/arch/s390/configs/debug_defconfig
index 46038bc58c9e..0b83274341ce 100644
--- a/arch/s390/configs/debug_defconfig
+++ b/arch/s390/configs/debug_defconfig
@@ -57,8 +57,6 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
 CONFIG_CMM=m
 CONFIG_APPLDATA_BASE=y
 CONFIG_KVM=m
-CONFIG_VHOST_NET=m
-CONFIG_VHOST_VSOCK=m
 CONFIG_OPROFILE=m
 CONFIG_KPROBES=y
 CONFIG_JUMP_LABEL=y
@@ -561,6 +559,9 @@ CONFIG_VFIO_MDEV_DEVICE=m
 CONFIG_VIRTIO_PCI=m
 CONFIG_VIRTIO_BALLOON=m
 CONFIG_VIRTIO_INPUT=y
+CONFIG_VHOST=m
+CONFIG_VHOST_NET=m
+CONFIG_VHOST_VSOCK=m
 CONFIG_S390_CCW_IOMMU=y
 CONFIG_S390_AP_IOMMU=y
 CONFIG_EXT4_FS=y
diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig
index 7cd0648c1f4e..39e69c4e8cf7 100644
--- a/arch/s390/configs/defconfig
+++ b/arch/s390/configs/defconfig
@@ -57,8 +57,6 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
 CONFIG_CMM=m
 CONFIG_APPLDATA_BASE=y
 CONFIG_KVM=m
-CONFIG_VHOST_NET=m
-CONFIG_VHOST_VSOCK=m
 CONFIG_OPROFILE=m
 CONFIG_KPROBES=y
 CONFIG_JUMP_LABEL=y
@@ -557,6 +555,9 @@ CONFIG_VFIO_MDEV_DEVICE=m
 CONFIG_VIRTIO_PCI=m
 CONFIG_VIRTIO_BALLOON=m
 CONFIG_VIRTIO_INPUT=y
+CONFIG_VHOST=m
+CONFIG_VHOST_NET=m
+CONFIG_VHOST_VSOCK=m
 CONFIG_S390_CCW_IOMMU=y
 CONFIG_S390_AP_IOMMU=y
 CONFIG_EXT4_FS=y
-- 
2.25.1

Michael S. Tsirkin

2020-Apr-01 14:01 UTC

head link

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

On Wed, Apr 01, 2020 at 03:02:00PM +0200, Christian Borntraeger
wrote:> 
> 
> On 01.04.20 14:56, Christian Borntraeger wrote:
> > 
> > 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
> 
> This was x86. Not sure if that did work before.
> On s390 this is definitely a regression as the defconfig files 
> for s390 do select VHOST_NET
> 
> grep VHOST arch/s390/configs/*
> arch/s390/configs/debug_defconfig:CONFIG_VHOST_NET=m
> arch/s390/configs/debug_defconfig:CONFIG_VHOST_VSOCK=m
> arch/s390/configs/defconfig:CONFIG_VHOST_NET=m
> arch/s390/configs/defconfig:CONFIG_VHOST_VSOCK=m
> 
> and this worked with 5.6, but does not work with next. Just adding
> CONFIG_VHOST=m to the defconfig solves the issue, something like
And a bunch of other places I guess... and I guess we need to
select VHOST_RING too?
Also Jason, I just noticed that you added:

config VHOST_RING
        tristate
+        select VHOST_IOTLB
        help
          This option is selected by any driver which needs to access
          the host side of a virtio ring.

but are you sure this will do the right thing if VHOST_RING itself
selected?

> ---
>  arch/s390/configs/debug_defconfig | 5 +++--
>  arch/s390/configs/defconfig       | 5 +++--
>  2 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/s390/configs/debug_defconfig
b/arch/s390/configs/debug_defconfig
> index 46038bc58c9e..0b83274341ce 100644
> --- a/arch/s390/configs/debug_defconfig
> +++ b/arch/s390/configs/debug_defconfig
> @@ -57,8 +57,6 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
>  CONFIG_CMM=m
>  CONFIG_APPLDATA_BASE=y
>  CONFIG_KVM=m
> -CONFIG_VHOST_NET=m
> -CONFIG_VHOST_VSOCK=m
>  CONFIG_OPROFILE=m
>  CONFIG_KPROBES=y
>  CONFIG_JUMP_LABEL=y
> @@ -561,6 +559,9 @@ CONFIG_VFIO_MDEV_DEVICE=m
>  CONFIG_VIRTIO_PCI=m
>  CONFIG_VIRTIO_BALLOON=m
>  CONFIG_VIRTIO_INPUT=y
> +CONFIG_VHOST=m
> +CONFIG_VHOST_NET=m
> +CONFIG_VHOST_VSOCK=m
>  CONFIG_S390_CCW_IOMMU=y
>  CONFIG_S390_AP_IOMMU=y
>  CONFIG_EXT4_FS=y
> diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig
> index 7cd0648c1f4e..39e69c4e8cf7 100644
> --- a/arch/s390/configs/defconfig
> +++ b/arch/s390/configs/defconfig
> @@ -57,8 +57,6 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
>  CONFIG_CMM=m
>  CONFIG_APPLDATA_BASE=y
>  CONFIG_KVM=m
> -CONFIG_VHOST_NET=m
> -CONFIG_VHOST_VSOCK=m
>  CONFIG_OPROFILE=m
>  CONFIG_KPROBES=y
>  CONFIG_JUMP_LABEL=y
> @@ -557,6 +555,9 @@ CONFIG_VFIO_MDEV_DEVICE=m
>  CONFIG_VIRTIO_PCI=m
>  CONFIG_VIRTIO_BALLOON=m
>  CONFIG_VIRTIO_INPUT=y
> +CONFIG_VHOST=m
> +CONFIG_VHOST_NET=m
> +CONFIG_VHOST_VSOCK=m
>  CONFIG_S390_CCW_IOMMU=y
>  CONFIG_S390_AP_IOMMU=y
>  CONFIG_EXT4_FS=y
> -- 
> 2.25.1

Jason Wang

2020-Apr-01 14:13 UTC

head link

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

On 2020/4/1 ??9:02, Christian Borntraeger wrote:>
> On 01.04.20 14:56, Christian Borntraeger wrote:
>> 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
> This was x86. Not sure if that did work before.
> On s390 this is definitely a regression as the defconfig files
> for s390 do select VHOST_NET
>
> grep VHOST arch/s390/configs/*
> arch/s390/configs/debug_defconfig:CONFIG_VHOST_NET=m
> arch/s390/configs/debug_defconfig:CONFIG_VHOST_VSOCK=m
> arch/s390/configs/defconfig:CONFIG_VHOST_NET=m
> arch/s390/configs/defconfig:CONFIG_VHOST_VSOCK=m
>
> and this worked with 5.6, but does not work with next. Just adding
> CONFIG_VHOST=m to the defconfig solves the issue, something like

Right, I think we probably need

1) add CONFIG_VHOST=m to all defconfigs that enables 
CONFIG_VHOST_NET/VSOCK/SCSI.

or

2) don't use menuconfig for CONFIG_VHOST, let NET/SCSI/VDPA just select it.

Thanks

>
> ---
>   arch/s390/configs/debug_defconfig | 5 +++--
>   arch/s390/configs/defconfig       | 5 +++--
>   2 files changed, 6 insertions(+), 4 deletions(-)
>
> diff --git a/arch/s390/configs/debug_defconfig
b/arch/s390/configs/debug_defconfig
> index 46038bc58c9e..0b83274341ce 100644
> --- a/arch/s390/configs/debug_defconfig
> +++ b/arch/s390/configs/debug_defconfig
> @@ -57,8 +57,6 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
>   CONFIG_CMM=m
>   CONFIG_APPLDATA_BASE=y
>   CONFIG_KVM=m
> -CONFIG_VHOST_NET=m
> -CONFIG_VHOST_VSOCK=m
>   CONFIG_OPROFILE=m
>   CONFIG_KPROBES=y
>   CONFIG_JUMP_LABEL=y
> @@ -561,6 +559,9 @@ CONFIG_VFIO_MDEV_DEVICE=m
>   CONFIG_VIRTIO_PCI=m
>   CONFIG_VIRTIO_BALLOON=m
>   CONFIG_VIRTIO_INPUT=y
> +CONFIG_VHOST=m
> +CONFIG_VHOST_NET=m
> +CONFIG_VHOST_VSOCK=m
>   CONFIG_S390_CCW_IOMMU=y
>   CONFIG_S390_AP_IOMMU=y
>   CONFIG_EXT4_FS=y
> diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig
> index 7cd0648c1f4e..39e69c4e8cf7 100644
> --- a/arch/s390/configs/defconfig
> +++ b/arch/s390/configs/defconfig
> @@ -57,8 +57,6 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
>   CONFIG_CMM=m
>   CONFIG_APPLDATA_BASE=y
>   CONFIG_KVM=m
> -CONFIG_VHOST_NET=m
> -CONFIG_VHOST_VSOCK=m
>   CONFIG_OPROFILE=m
>   CONFIG_KPROBES=y
>   CONFIG_JUMP_LABEL=y
> @@ -557,6 +555,9 @@ CONFIG_VFIO_MDEV_DEVICE=m
>   CONFIG_VIRTIO_PCI=m
>   CONFIG_VIRTIO_BALLOON=m
>   CONFIG_VIRTIO_INPUT=y
> +CONFIG_VHOST=m
> +CONFIG_VHOST_NET=m
> +CONFIG_VHOST_VSOCK=m
>   CONFIG_S390_CCW_IOMMU=y
>   CONFIG_S390_AP_IOMMU=y
>   CONFIG_EXT4_FS=y

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