linux-kernel - RE: [PATCH v2 2/2] Drivers: hv: Introduce mshv

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Message-ID:
 <KUZP153MB1444CF7C66D521208B0CAC76BE97A@KUZP153MB1444.APCP153.PROD.OUTLOOK.COM>
Date: Mon, 12 May 2025 14:12:52 +0000
From: Saurabh Singh Sengar <ssengar@...rosoft.com>
To: Naman Jain <namjain@...ux.microsoft.com>, KY Srinivasan
	<kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu
	<wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>
CC: Roman Kisel <romank@...ux.microsoft.com>, Anirudh Rayabharam
	<anrayabh@...ux.microsoft.com>, Saurabh Sengar <ssengar@...ux.microsoft.com>,
	Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>, Nuno Das Neves
	<nunodasneves@...ux.microsoft.com>, ALOK TIWARI <alok.a.tiwari@...cle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
Subject: RE: [PATCH v2 2/2] Drivers: hv: Introduce mshv_vtl driver


> Provide an interface for Virtual Machine Monitor like OpenVMM and its
> use as OpenHCL paravisor to control VTL0 (Virtual trust Level).
> Expose devices and support IOCTLs for features like VTL creation,
> VTL0 memory management, context switch, making hypercalls,
> mapping VTL0 address space to VTL2 userspace, getting new VMBus
> messages and channel events in VTL2 etc.
> 
> Co-developed-by: Roman Kisel <romank@...ux.microsoft.com>
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
> Co-developed-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
> Reviewed-by: Roman Kisel <romank@...ux.microsoft.com>
> Signed-off-by: Naman Jain <namjain@...ux.microsoft.com>
> ---
>  drivers/hv/Kconfig          |   21 +
>  drivers/hv/Makefile         |    7 +-
>  drivers/hv/mshv_vtl.h       |   52 +
>  drivers/hv/mshv_vtl_main.c  | 1783
> +++++++++++++++++++++++++++++++++++
>  include/hyperv/hvgdk_mini.h |   81 ++
>  include/hyperv/hvhdk.h      |    1 +
>  include/uapi/linux/mshv.h   |   82 ++
>  7 files changed, 2026 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/hv/mshv_vtl.h
>  create mode 100644 drivers/hv/mshv_vtl_main.c
> 
> diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
> index eefa0b559b73..05f990306d40 100644
> --- a/drivers/hv/Kconfig
> +++ b/drivers/hv/Kconfig
> @@ -72,4 +72,25 @@ config MSHV_ROOT
> 
>  	  If unsure, say N.
> 
> +config MSHV_VTL
> +	tristate "Microsoft Hyper-V VTL driver"
> +	depends on HYPERV && X86_64
> +	depends on TRANSPARENT_HUGEPAGE
> +	depends on OF

I am aware that OpenHCL works only with DeviceTree and hence we have to
enable CONFIG_OF, but I am not aware of any dependency in this driver, why
we need to enable CONFIG_OF by this driver.

We can always enable CONFIG_OF separately in OpenHCL kernel configs. Please check.

- Saurabh