[PATCH V2] vhost: do not enable VHOST_MENU by default

From: Jason Wang <jasowang@redhat.com>
To: jasowang@redhat.com, mst@redhat.com
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
	netdev@vger.kernel.org, geert@linux-m68k.org,
	tsbogend@alpha.franken.de, benh@kernel.crashing.org,
	paulus@samba.org, heiko.carstens@de.ibm.com, gor@linux.ibm.com,
	borntraeger@de.ibm.com, Michael Ellerman <mpe@ellerman.id.au>
Subject: [PATCH V2] vhost: do not enable VHOST_MENU by default
Date: Wed, 15 Apr 2020 10:43:56 +0800	[thread overview]
Message-ID: <20200415024356.23751-1-jasowang@redhat.com> (raw)

We try to keep the defconfig untouched after decoupling CONFIG_VHOST
out of CONFIG_VIRTUALIZATION in commit 20c384f1ea1a
("vhost: refine vhost and vringh kconfig") by enabling VHOST_MENU by
default. Then the defconfigs can keep enabling CONFIG_VHOST_NET
without the caring of CONFIG_VHOST.

But this will leave a "CONFIG_VHOST_MENU=y" in all defconfigs and even
for the ones that doesn't want vhost. So it actually shifts the
burdens to the maintainers of all other to add "CONFIG_VHOST_MENU is
not set". So this patch tries to enable CONFIG_VHOST explicitly in
defconfigs that enables CONFIG_VHOST_NET and CONFIG_VHOST_VSOCK.

Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> (s390)
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
Change since V1:
- depends on EVENTFD for VHOST
---
 arch/mips/configs/malta_kvm_defconfig  |  1 +
 arch/powerpc/configs/powernv_defconfig |  1 +
 arch/powerpc/configs/ppc64_defconfig   |  1 +
 arch/powerpc/configs/pseries_defconfig |  1 +
 arch/s390/configs/debug_defconfig      |  1 +
 arch/s390/configs/defconfig            |  1 +
 drivers/vhost/Kconfig                  | 26 +++++++++-----------------
 7 files changed, 15 insertions(+), 17 deletions(-)

diff --git a/arch/mips/configs/malta_kvm_defconfig b/arch/mips/configs/malta_kvm_defconfig
index 8ef612552a19..06f0c7a0ca87 100644
--- a/arch/mips/configs/malta_kvm_defconfig
+++ b/arch/mips/configs/malta_kvm_defconfig
@@ -18,6 +18,7 @@ CONFIG_PCI=y
 CONFIG_VIRTUALIZATION=y
 CONFIG_KVM=m
 CONFIG_KVM_MIPS_DEBUG_COP0_COUNTERS=y
+CONFIG_VHOST=m
 CONFIG_VHOST_NET=m
 CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
diff --git a/arch/powerpc/configs/powernv_defconfig b/arch/powerpc/configs/powernv_defconfig
index 71749377d164..404245b4594d 100644
--- a/arch/powerpc/configs/powernv_defconfig
+++ b/arch/powerpc/configs/powernv_defconfig
@@ -346,5 +346,6 @@ CONFIG_CRYPTO_DEV_VMX=y
 CONFIG_VIRTUALIZATION=y
 CONFIG_KVM_BOOK3S_64=m
 CONFIG_KVM_BOOK3S_64_HV=m
+CONFIG_VHOST=m
 CONFIG_VHOST_NET=m
 CONFIG_PRINTK_TIME=y
diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig
index 7e68cb222c7b..4599fc7be285 100644
--- a/arch/powerpc/configs/ppc64_defconfig
+++ b/arch/powerpc/configs/ppc64_defconfig
@@ -61,6 +61,7 @@ CONFIG_ELECTRA_CF=y
 CONFIG_VIRTUALIZATION=y
 CONFIG_KVM_BOOK3S_64=m
 CONFIG_KVM_BOOK3S_64_HV=m
+CONFIG_VHOST=m
 CONFIG_VHOST_NET=m
 CONFIG_OPROFILE=m
 CONFIG_KPROBES=y
diff --git a/arch/powerpc/configs/pseries_defconfig b/arch/powerpc/configs/pseries_defconfig
index 6b68109e248f..4cad3901b5de 100644
--- a/arch/powerpc/configs/pseries_defconfig
+++ b/arch/powerpc/configs/pseries_defconfig
@@ -321,5 +321,6 @@ CONFIG_CRYPTO_DEV_VMX=y
 CONFIG_VIRTUALIZATION=y
 CONFIG_KVM_BOOK3S_64=m
 CONFIG_KVM_BOOK3S_64_HV=m
+CONFIG_VHOST=m
 CONFIG_VHOST_NET=m
 CONFIG_PRINTK_TIME=y
diff --git a/arch/s390/configs/debug_defconfig b/arch/s390/configs/debug_defconfig
index 0c86ba19fa2b..6ec6e69630d1 100644
--- a/arch/s390/configs/debug_defconfig
+++ b/arch/s390/configs/debug_defconfig
@@ -57,6 +57,7 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
 CONFIG_CMM=m
 CONFIG_APPLDATA_BASE=y
 CONFIG_KVM=m
+CONFIG_VHOST=m
 CONFIG_VHOST_NET=m
 CONFIG_VHOST_VSOCK=m
 CONFIG_OPROFILE=m
diff --git a/arch/s390/configs/defconfig b/arch/s390/configs/defconfig
index 6b27d861a9a3..d1b3bf83d687 100644
--- a/arch/s390/configs/defconfig
+++ b/arch/s390/configs/defconfig
@@ -57,6 +57,7 @@ CONFIG_PROTECTED_VIRTUALIZATION_GUEST=y
 CONFIG_CMM=m
 CONFIG_APPLDATA_BASE=y
 CONFIG_KVM=m
+CONFIG_VHOST=m
 CONFIG_VHOST_NET=m
 CONFIG_VHOST_VSOCK=m
 CONFIG_OPROFILE=m
diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
index e79cbbdfea45..29f171a53d8a 100644
--- a/drivers/vhost/Kconfig
+++ b/drivers/vhost/Kconfig
@@ -12,23 +12,19 @@ config VHOST_RING
 	  This option is selected by any driver which needs to access
 	  the host side of a virtio ring.
 
-config VHOST
-	tristate
+menuconfig VHOST
+	tristate "Vhost Devices"
+	depends on EVENTFD
 	select VHOST_IOTLB
 	help
-	  This option is selected by any driver which needs to access
-	  the core of vhost.
+	  Enable option to support host kernel or hardware accelerator
+	  for virtio device.
 
-menuconfig VHOST_MENU
-	bool "VHOST drivers"
-	default y
-
-if VHOST_MENU
+if VHOST
 
 config VHOST_NET
 	tristate "Host kernel accelerator for virtio net"
-	depends on NET && EVENTFD && (TUN || !TUN) && (TAP || !TAP)
-	select VHOST
+	depends on NET && (TUN || !TUN) && (TAP || !TAP)
 	---help---
 	  This kernel module can be loaded in host kernel to accelerate
 	  guest networking with virtio_net. Not to be confused with virtio_net
@@ -39,8 +35,7 @@ config VHOST_NET
 
 config VHOST_SCSI
 	tristate "VHOST_SCSI TCM fabric driver"
-	depends on TARGET_CORE && EVENTFD
-	select VHOST
+	depends on TARGET_CORE
 	default n
 	---help---
 	Say M here to enable the vhost_scsi TCM fabric module
@@ -48,8 +43,7 @@ config VHOST_SCSI
 
 config VHOST_VSOCK
 	tristate "vhost virtio-vsock driver"
-	depends on VSOCKETS && EVENTFD
-	select VHOST
+	depends on VSOCKETS
 	select VIRTIO_VSOCKETS_COMMON
 	default n
 	---help---
@@ -62,8 +56,6 @@ config VHOST_VSOCK
 
 config VHOST_VDPA
 	tristate "Vhost driver for vDPA-based backend"
-	depends on EVENTFD
-	select VHOST
 	depends on VDPA
 	help
 	  This kernel module can be loaded in host kernel to accelerate
-- 
2.20.1

