linux-kernel - Re: [PATCH v2 3/3] hyperv: Add CONFIG_MSHV

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Message-ID: <e85ddfef-2081-4c8a-96e6-e84a8410ff85@linux.microsoft.com>
Date: Thu, 20 Feb 2025 11:02:06 -0800
From: Easwar Hariharan <eahariha@...ux.microsoft.com>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
 iommu@...ts.linux.dev, mhklinux@...look.com, eahariha@...ux.microsoft.com,
 kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
 decui@...rosoft.com, catalin.marinas@....com, will@...nel.org,
 tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 daniel.lezcano@...aro.org, joro@...tes.org, robin.murphy@....com,
 arnd@...db.de, jinankjain@...ux.microsoft.com, muminulrussell@...il.com,
 skinsburskii@...ux.microsoft.com, mukeshrathor@...rosoft.com
Subject: Re: [PATCH v2 3/3] hyperv: Add CONFIG_MSHV_ROOT to gate root
 partition support

On 2/20/2025 10:33 AM, Nuno Das Neves wrote:
> CONFIG_MSHV_ROOT allows kernels built to run as a normal Hyper-V guest
> to exclude the root partition code, which is expected to grow
> significantly over time.
> 
> This option is a tristate so future driver code can be built as a
> (m)odule, allowing faster development iteration cycles.
> 
> If CONFIG_MSHV_ROOT is disabled, don't compile hv_proc.c, and stub
> hv_root_partition() to return false unconditionally. This allows the
> compiler to optimize away root partition code blocks since they will
> be disabled at compile time.
> 
> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
> ---
>  drivers/hv/Kconfig             | 16 ++++++++++++++++
>  drivers/hv/Makefile            |  3 ++-
>  include/asm-generic/mshyperv.h | 24 ++++++++++++++++++++----
>  3 files changed, 38 insertions(+), 5 deletions(-)

Looks good to me.

Reviewed-by: Easwar Hariharan <eahariha@...ux.microsoft.com>