linux-kernel - Re: [PATCH] firmware: smccc: support both conduits for getting hyp UUID

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Message-ID: <20250605-kickass-cerulean-honeybee-aa0cba@sudeepholla>
Date: Thu, 5 Jun 2025 16:33:50 +0100
From: Sudeep Holla <sudeep.holla@....com>
To: Anirudh Rayabharam <anirudh@...rudhrb.com>
Cc: Mark Rutland <mark.rutland@....com>,
	Sudeep Holla <sudeep.holla@....com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	linux-hyperv@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: smccc: support both conduits for getting hyp
 UUID

(sorry for the delay, found the patch in the spam 🙁)

On Wed, May 21, 2025 at 09:40:48AM +0000, Anirudh Rayabharam wrote:
> From: Anirudh Rayabharam (Microsoft) <anirudh@...rudhrb.com>
> 
> When Linux is running as the root partition under Microsoft Hypervisor
> (MSHV) a.k.a Hyper-V, smc is used as the conduit for smc calls.
> 
> Extend arm_smccc_hypervisor_has_uuid() to support this usecase. Use
> arm_smccc_1_1_invoke to retrieve and use the appropriate conduit instead
> of supporting only hvc.
> 
> Boot tested on MSHV guest, MSHV root & KVM guest.
>

Reviewed-by: Sudeep Holla <sudeep.holla@....com>

Are they any dependent patches or series using this ? Do you plan to
route it via KVM tree if there are any dependency. Or else I can push
it through (arm-)soc tree. Let me know.

-- 
Regards,
Sudeep