linux-kernel - Re: [RFC PATCH v1 11/38] KVM: arm64: CCA: register host tsm platform device

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Message-ID: <20251015121533.GF3938986@ziepe.ca>
Date: Wed, 15 Oct 2025 09:15:33 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
	Jeremy Linton <jeremy.linton@....com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Dan Williams <dan.j.williams@...el.com>, linux-coco@...ts.linux.dev,
	kvmarm@...ts.linux.dev, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, aik@....com, lukas@...ner.de,
	Samuel Ortiz <sameo@...osinc.com>,
	Xu Yilun <yilun.xu@...ux.intel.com>,
	Suzuki K Poulose <Suzuki.Poulose@....com>,
	Steven Price <steven.price@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>
Subject: Re: [RFC PATCH v1 11/38] KVM: arm64: CCA: register host tsm platform
 device

On Wed, Oct 15, 2025 at 01:57:38PM +0200, Greg KH wrote:

> If this really is a firmware thing, and you have a firmware device, then
> I am confused why this was even brought up at all?  Use a real platform
> device, with the resources that are needed to talk to this platform
> device and you should be fine.

I think the issue today is the PSCI does not always get a
platform_device, fixing that seems straightforward then all the
downstream things can switch from using more platform devices to using
an aux device with the PSCI as the parent..

> BUT, if you are making child devices that are NOT actually talking to
> the firmware,

This thread is about how to bind various subsystems to this shared
firmware interface.

Jason