linux-kernel - Re: [PATCH v2 0/3] Introduce CONFIG_MSHV

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Message-ID: <Z7k3Jh9O8noNZXGt@liuwe-devbox-debian-v2>
Date: Sat, 22 Feb 2025 02:32:06 +0000
From: Wei Liu <wei.liu@...nel.org>
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,
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Subject: Re: [PATCH v2 0/3] Introduce CONFIG_MSHV_ROOT for root partition code

On Fri, Feb 21, 2025 at 11:56:32AM -0800, Nuno Das Neves wrote:
> Running in the root partition is a unique and specialized case that
> requires additional code. CONFIG_MSHV_ROOT allows Hyper-V guest kernels
> to exclude this code, which is important since significant additional code
> specific to the root partition is expected to be added over time.
> 
> To do this, change hv_root_partition to be a function which is stubbed out
> to return false if CONFIG_MSHV_ROOT=n, and don't compile hv_proc.c at all,
> stubbing out those functions with inline versions.
> 
> Store the partition type (guest or root) in an enum hv_curr_partition_type,
> which can be extended beyond just guest and root partition.
> 
> While at it, introduce hv_result_to_errno() to convert Hyper-V status codes
> to regular linux errors. This is useful because the caller of a hypercall
> helper function (such as those in hv_proc.c) usually can't and doesn't
> interpret the Hyper-V status, so it is better to convert it to an error code
> and reduce the possibility of misinterpreting it. This also alows the stubbed
> versions of the hv_proc.c functions to just return a linux error code.
> 
> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>

No need to sign this off. :-)

> 
> Nuno Das Neves (3):
>   hyperv: Convert hypercall statuses to linux error codes
>   hyperv: Change hv_root_partition into a function
>   hyperv: Add CONFIG_MSHV_ROOT to gate root partition support
> 

Applied to hyperv-next. Thanks.