On Wed, Apr 01, 2020 at 10:29:32PM +0800, Jason Wang wrote: > > On 2020/4/1 下午10:13, Michael S. Tsirkin wrote: > > On Wed, Apr 01, 2020 at 10:08:59PM +0800, Jason Wang wrote: > > > On 2020/4/1 下午9:22, Michael S. Tsirkin wrote: > > > > On Thu, Mar 26, 2020 at 10:01:17PM +0800, 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. > > > > > > > > > > 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@xxxxxxxxxx> > > > > Is this just so we can drop the dependency on CONFIG_VIRTUALIZATION? > > > > If yes what happens if we drop this patch? > > > > > > The problem is that then VHOST_RING must depend on CONFIG_VIRTUALIZATION > > > (which enable VHOST_IOTLB) to work. > > > > > > But it looks to me CAIF and VOP doesn't requires CONFIG_VIRTUALIZATION. > > How about stubs for IOTLB so VHOST_RING does not depend on VHOST_IOTLB? > > > That could work. > > > > I'm pretty sure neither user of vringh can actually use IOTLB, it's a > > software only thing. > > > Right. > > > > > > > > Given the impact it had I'd like to defer it till next release if > > > > possible. > > > > > > > > > > > > > --- > > > > > 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 > > > > > + > > > > The description here is wrong, isn't it? > > > > VHOST and VHOST_RING are no longer selected, right? > > > > > > For VHOST not currently. > > Can we just bring it back and select it? > > > Right, so if bring it back, we don't even need the stub. > > How about something like attached? > > Thanks > > > > > > > For VHOST_RING, it was selected by CAIF, VOP and VDPASIM. > > > > > > Thanks > > > > > > > > > > > > > > > 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. > > > > > -- > > > > > 2.20.1 > >From 9b3a5d23b8bf6b0a11e65e688335d782f8e6aa5c Mon Sep 17 00:00:00 2001 > From: Jason Wang <jasowang@xxxxxxxxxx> > 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@xxxxxxxxxx> > --- > 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@xxxxxxxxx> 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 ... -- MST
