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

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Message-ID: <aFKvG69DVhHcI5Mn@anirudh-surface.localdomain>
Date: Wed, 18 Jun 2025 12:20:43 +0000
From: Anirudh Rayabharam <anirudh@...rudhrb.com>
To: Sudeep Holla <sudeep.holla@....com>
Cc: Roman Kisel <romank@...ux.microsoft.com>,
	linux-arm-kernel@...ts.infradead.org, linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org, lpieralisi@...nel.org,
	mark.rutland@....com
Subject: Re: [PATCH] firmware: smccc: support both conduits for getting hyp
 UUID

On Wed, Jun 11, 2025 at 01:52:32PM +0100, Sudeep Holla wrote:
> On Tue, Jun 10, 2025 at 09:06:48AM -0700, Roman Kisel wrote:
> > > (sorry for the delay, found the patch in the spam 🙁)
> > 
> > "b4" shows the the mail server used for the patch submission
> > doesn't pass the DKIM check, so finding the patch in the spam seems
> > expected :) Thanks for your help!
> > 
> 
> Thought so looking at the header but I just have very basic knowledge
> there, so couldn't comment.
> 
> > >
> > > 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.
> > 
> > Anirudh had been OOF for some time and would be for another
> > week iiuc so I thought I'd reply.
> > 
> > The patch this depends on is 13423063c7cb
> > ("arm64: kvm, smccc: Introduce and use API for getting hypervisor UUID"),
> > and this patch has already been pulled into the Linus'es tree.
> > 
> 
> Had a quick look at the commit to refresh my memory and as you mentioned
> it is new feature. I was checking to see if this is a fix.
> 
> > As for routing, (arm-)soc should be good it appears as the change
> > is contained within the firmware drivers path. Although I'd trust more to your,
> > Arnd's or Wei's opinion than mine!
> > 
> 
> I will queue this once I start collecting patches for v6.17 in 1/2 weeks'
> time, so expect silence until then 😄.

Sounds good, thanks!

Regards,
Anirudh.

> 
> -- 
> Regards,
> Sudeep