From: "Michael S. Tsirkin" <mst@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Jason Wang <jasowang@redhat.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, jgg@mellanox.com,
maxime.coquelin@redhat.com, cunming.liang@intel.com,
zhihong.wang@intel.com, rob.miller@broadcom.com,
xiao.w.wang@intel.com, lingshan.zhu@intel.com,
eperezma@redhat.com, lulu@redhat.com, parav@mellanox.com,
kevin.tian@intel.com, stefanha@redhat.com, rdunlap@infradead.org,
hch@infradead.org, aadam@redhat.com, jiri@mellanox.com,
shahafs@mellanox.com, hanand@xilinx.com, mhabets@solarflare.com,
gdawar@xilinx.com, saugatm@xilinx.com, vmireyno@marvell.com,
zhangweining@ruijie.com.cn
Subject: Re: [PATCH V9 1/9] vhost: refine vhost and vringh kconfig
Date: Wed, 1 Apr 2020 10:01:26 -0400 [thread overview]
Message-ID: <20200401095820-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <39b96e3a-9f4e-6e1d-e988-8c4bcfb55879@de.ibm.com>
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 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
>
> 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
next prev parent reply other threads:[~2020-04-01 14:01 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-26 14:01 [PATCH V9 0/9] vDPA support Jason Wang
2020-03-26 14:01 ` [PATCH V9 1/9] vhost: refine vhost and vringh kconfig Jason Wang
2020-04-01 11:21 ` Christian Borntraeger
2020-04-01 12:50 ` Jason Wang
2020-04-01 12:56 ` Christian Borntraeger
2020-04-01 13:02 ` Christian Borntraeger
2020-04-01 14:01 ` Michael S. Tsirkin [this message]
2020-04-01 14:13 ` Jason Wang
2020-04-01 14:18 ` Michael S. Tsirkin
2020-04-01 14:36 ` Jason Wang
2020-04-01 14:27 ` Michael S. Tsirkin
2020-04-01 14:50 ` Jason Wang
2020-04-01 15:57 ` Michael S. Tsirkin
2020-04-01 18:53 ` Christian Borntraeger
2020-04-01 13:22 ` Michael S. Tsirkin
2020-04-01 14:08 ` Jason Wang
2020-04-01 14:13 ` Michael S. Tsirkin
2020-04-01 14:29 ` Jason Wang
2020-04-01 14:35 ` Michael S. Tsirkin
2020-04-01 14:39 ` Jason Wang
2020-04-01 14:39 ` Michael S. Tsirkin
2020-04-01 14:43 ` Jason Wang
2020-04-01 16:05 ` Michael S. Tsirkin
2020-04-01 16:08 ` Michael S. Tsirkin
2020-04-02 3:22 ` Jason Wang
2020-04-02 14:03 ` Michael S. Tsirkin
2020-04-02 14:23 ` Jason Wang
2020-04-02 14:38 ` Michael S. Tsirkin
2020-04-02 14:56 ` Jason Wang
2020-03-26 14:01 ` [PATCH V9 2/9] vhost: allow per device message handler Jason Wang
2020-03-26 14:01 ` [PATCH V9 3/9] vhost: factor out IOTLB Jason Wang
2020-03-26 14:01 ` [PATCH V9 4/9] vringh: IOTLB support Jason Wang
2020-03-26 14:01 ` [PATCH V9 5/9] vDPA: introduce vDPA bus Jason Wang
2020-03-26 14:01 ` [PATCH V9 6/9] virtio: introduce a vDPA based transport Jason Wang
2020-03-26 14:01 ` [PATCH V9 7/9] vhost: introduce vDPA-based backend Jason Wang
2021-11-01 14:11 ` Jason Gunthorpe
2021-11-02 3:52 ` Jason Wang
2021-11-02 15:56 ` Jason Gunthorpe
2021-11-03 7:34 ` Jason Wang
2020-03-26 14:01 ` [PATCH V9 8/9] vdpasim: vDPA device simulator Jason Wang
2020-04-10 7:45 ` Geert Uytterhoeven
2020-04-10 8:23 ` Jason Wang
2020-03-26 14:01 ` [PATCH V9 9/9] virtio: Intel IFC VF driver for VDPA Jason Wang
2020-04-09 10:41 ` Arnd Bergmann
2020-04-09 12:43 ` Jason Wang
2020-04-09 12:49 ` Zhu, Lingshan
2020-04-09 20:25 ` Michael S. Tsirkin
2020-04-10 3:15 ` Zhu, Lingshan
2020-03-29 11:07 ` [PATCH V9 0/9] vDPA support Michael S. Tsirkin
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