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Message-ID: <20250916155013.GA1800495@bhelgaas>
Date: Tue, 16 Sep 2025 10:50:13 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Mukesh Rathor <mrathor@...ux.microsoft.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
linux-input@...r.kernel.org, linux-hyperv@...r.kernel.org,
netdev@...r.kernel.org, linux-pci@...r.kernel.org,
linux-scsi@...r.kernel.org, linux-fbdev@...r.kernel.org,
linux-arch@...r.kernel.org, virtualization@...ts.linux.dev,
maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
tzimmermann@...e.de, airlied@...il.com, simona@...ll.ch,
jikos@...nel.org, bentiss@...nel.org, kys@...rosoft.com,
haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
dmitry.torokhov@...il.com, andrew+netdev@...n.ch,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, bhelgaas@...gle.com,
James.Bottomley@...senpartnership.com, martin.petersen@...cle.com,
gregkh@...uxfoundation.org, deller@....de, arnd@...db.de,
sgarzare@...hat.com, horms@...nel.org
Subject: Re: [PATCH v2 1/2] Driver: hv: Add CONFIG_HYPERV_VMBUS option
On Mon, Sep 15, 2025 at 04:46:03PM -0700, Mukesh Rathor wrote:
> At present VMBus driver is hinged off of CONFIG_HYPERV which entails
> lot of builtin code and encompasses too much. It's not always clear
> what depends on builtin hv code and what depends on VMBus. Setting
> CONFIG_HYPERV as a module and fudging the Makefile to switch to builtin
> adds even more confusion. VMBus is an independent module and should have
> its own config option. Also, there are scenarios like baremetal dom0/root
> where support is built in with CONFIG_HYPERV but without VMBus. Lastly,
> there are more features coming down that use CONFIG_HYPERV and add more
> dependencies on it.
>
> So, create a fine grained HYPERV_VMBUS option and update Kconfigs for
> dependency on VMBus.
>
> Signed-off-by: Mukesh Rathor <mrathor@...ux.microsoft.com>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com> # drivers/pci
> ---
> drivers/gpu/drm/Kconfig | 2 +-
> drivers/hid/Kconfig | 2 +-
> drivers/hv/Kconfig | 11 +++++++++--
> drivers/hv/Makefile | 2 +-
> drivers/input/serio/Kconfig | 4 ++--
> drivers/net/hyperv/Kconfig | 2 +-
> drivers/pci/Kconfig | 2 +-
> drivers/scsi/Kconfig | 2 +-
> drivers/uio/Kconfig | 2 +-
> drivers/video/fbdev/Kconfig | 2 +-
> include/asm-generic/mshyperv.h | 8 +++++---
> net/vmw_vsock/Kconfig | 2 +-
> 12 files changed, 25 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index f7ea8e895c0c..58f34da061c6 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -398,7 +398,7 @@ source "drivers/gpu/drm/imagination/Kconfig"
>
> config DRM_HYPERV
> tristate "DRM Support for Hyper-V synthetic video device"
> - depends on DRM && PCI && HYPERV
> + depends on DRM && PCI && HYPERV_VMBUS
> select DRM_CLIENT_SELECTION
> select DRM_KMS_HELPER
> select DRM_GEM_SHMEM_HELPER
> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
> index a57901203aeb..fe3dc8c0db99 100644
> --- a/drivers/hid/Kconfig
> +++ b/drivers/hid/Kconfig
> @@ -1162,7 +1162,7 @@ config GREENASIA_FF
>
> config HID_HYPERV_MOUSE
> tristate "Microsoft Hyper-V mouse driver"
> - depends on HYPERV
> + depends on HYPERV_VMBUS
> help
> Select this option to enable the Hyper-V mouse driver.
>
> diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
> index e24f6299c376..29f8637f441a 100644
> --- a/drivers/hv/Kconfig
> +++ b/drivers/hv/Kconfig
> @@ -45,18 +45,25 @@ config HYPERV_TIMER
>
> config HYPERV_UTILS
> tristate "Microsoft Hyper-V Utilities driver"
> - depends on HYPERV && CONNECTOR && NLS
> + depends on HYPERV_VMBUS && CONNECTOR && NLS
> depends on PTP_1588_CLOCK_OPTIONAL
> help
> Select this option to enable the Hyper-V Utilities.
>
> config HYPERV_BALLOON
> tristate "Microsoft Hyper-V Balloon driver"
> - depends on HYPERV
> + depends on HYPERV_VMBUS
> select PAGE_REPORTING
> help
> Select this option to enable Hyper-V Balloon driver.
>
> +config HYPERV_VMBUS
> + tristate "Microsoft Hyper-V VMBus driver"
> + depends on HYPERV
> + default HYPERV
> + help
> + Select this option to enable Hyper-V Vmbus driver.
> +
> config MSHV_ROOT
> tristate "Microsoft Hyper-V root partition support"
> depends on HYPERV && (X86_64 || ARM64)
> diff --git a/drivers/hv/Makefile b/drivers/hv/Makefile
> index 976189c725dc..4bb41663767d 100644
> --- a/drivers/hv/Makefile
> +++ b/drivers/hv/Makefile
> @@ -1,5 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0
> -obj-$(CONFIG_HYPERV) += hv_vmbus.o
> +obj-$(CONFIG_HYPERV_VMBUS) += hv_vmbus.o
> obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o
> obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o
> obj-$(CONFIG_MSHV_ROOT) += mshv_root.o
> diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig
> index 17edc1597446..c7ef347a4dff 100644
> --- a/drivers/input/serio/Kconfig
> +++ b/drivers/input/serio/Kconfig
> @@ -276,8 +276,8 @@ config SERIO_OLPC_APSP
>
> config HYPERV_KEYBOARD
> tristate "Microsoft Synthetic Keyboard driver"
> - depends on HYPERV
> - default HYPERV
> + depends on HYPERV_VMBUS
> + default HYPERV_VMBUS
> help
> Select this option to enable the Hyper-V Keyboard driver.
>
> diff --git a/drivers/net/hyperv/Kconfig b/drivers/net/hyperv/Kconfig
> index c8cbd85adcf9..982964c1a9fb 100644
> --- a/drivers/net/hyperv/Kconfig
> +++ b/drivers/net/hyperv/Kconfig
> @@ -1,7 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0-only
> config HYPERV_NET
> tristate "Microsoft Hyper-V virtual network driver"
> - depends on HYPERV
> + depends on HYPERV_VMBUS
> select UCS2_STRING
> select NLS
> help
> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index 9a249c65aedc..7065a8e5f9b1 100644
> --- a/drivers/pci/Kconfig
> +++ b/drivers/pci/Kconfig
> @@ -221,7 +221,7 @@ config PCI_LABEL
>
> config PCI_HYPERV
> tristate "Hyper-V PCI Frontend"
> - depends on ((X86 && X86_64) || ARM64) && HYPERV && PCI_MSI && SYSFS
> + depends on ((X86 && X86_64) || ARM64) && HYPERV_VMBUS && PCI_MSI && SYSFS
> select PCI_HYPERV_INTERFACE
> select IRQ_MSI_LIB
> help
> diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
> index 5522310bab8d..19d0884479a2 100644
> --- a/drivers/scsi/Kconfig
> +++ b/drivers/scsi/Kconfig
> @@ -589,7 +589,7 @@ config XEN_SCSI_FRONTEND
>
> config HYPERV_STORAGE
> tristate "Microsoft Hyper-V virtual storage driver"
> - depends on SCSI && HYPERV
> + depends on SCSI && HYPERV_VMBUS
> depends on m || SCSI_FC_ATTRS != m
> default HYPERV
> help
> diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
> index b060dcd7c635..6f86a61231e6 100644
> --- a/drivers/uio/Kconfig
> +++ b/drivers/uio/Kconfig
> @@ -140,7 +140,7 @@ config UIO_MF624
>
> config UIO_HV_GENERIC
> tristate "Generic driver for Hyper-V VMBus"
> - depends on HYPERV
> + depends on HYPERV_VMBUS
> help
> Generic driver that you can bind, dynamically, to any
> Hyper-V VMBus device. It is useful to provide direct access
> diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
> index c21484d15f0c..72c63eaeb983 100644
> --- a/drivers/video/fbdev/Kconfig
> +++ b/drivers/video/fbdev/Kconfig
> @@ -1774,7 +1774,7 @@ config FB_BROADSHEET
>
> config FB_HYPERV
> tristate "Microsoft Hyper-V Synthetic Video support"
> - depends on FB && HYPERV
> + depends on FB && HYPERV_VMBUS
> select DMA_CMA if HAVE_DMA_CONTIGUOUS && CMA
> select FB_IOMEM_HELPERS_DEFERRED
> help
> diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
> index dbd4c2f3aee3..64ba6bc807d9 100644
> --- a/include/asm-generic/mshyperv.h
> +++ b/include/asm-generic/mshyperv.h
> @@ -163,6 +163,7 @@ static inline u64 hv_generate_guest_id(u64 kernel_version)
> return guest_id;
> }
>
> +#if IS_ENABLED(CONFIG_HYPERV_VMBUS)
> /* Free the message slot and signal end-of-message if required */
> static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
> {
> @@ -198,6 +199,10 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
> }
> }
>
> +extern int vmbus_interrupt;
> +extern int vmbus_irq;
> +#endif /* CONFIG_HYPERV_VMBUS */
> +
> int hv_get_hypervisor_version(union hv_hypervisor_version_info *info);
>
> void hv_setup_vmbus_handler(void (*handler)(void));
> @@ -211,9 +216,6 @@ void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
> void hv_remove_crash_handler(void);
> void hv_setup_mshv_handler(void (*handler)(void));
>
> -extern int vmbus_interrupt;
> -extern int vmbus_irq;
> -
> #if IS_ENABLED(CONFIG_HYPERV)
> /*
> * Hypervisor's notion of virtual processor ID is different from
> diff --git a/net/vmw_vsock/Kconfig b/net/vmw_vsock/Kconfig
> index 56356d2980c8..8e803c4828c4 100644
> --- a/net/vmw_vsock/Kconfig
> +++ b/net/vmw_vsock/Kconfig
> @@ -72,7 +72,7 @@ config VIRTIO_VSOCKETS_COMMON
>
> config HYPERV_VSOCKETS
> tristate "Hyper-V transport for Virtual Sockets"
> - depends on VSOCKETS && HYPERV
> + depends on VSOCKETS && HYPERV_VMBUS
> help
> This module implements a Hyper-V transport for Virtual Sockets.
>
> --
> 2.36.1.vfs.0.0
>
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