linux-kernel - Re: [PATCH v2 09/11] coco: guest: arm64: Wire Realm TDISP RUN/STOP transitions into guest driver

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Message-ID: <20251120175540.00002cf6@huawei.com>
Date: Thu, 20 Nov 2025 17:55:40 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org>
CC: <linux-coco@...ts.linux.dev>, <kvmarm@...ts.linux.dev>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dan.j.williams@...el.com>, <aik@....com>, <lukas@...ner.de>, Samuel Ortiz
	<sameo@...osinc.com>, Xu Yilun <yilun.xu@...ux.intel.com>, Jason Gunthorpe
	<jgg@...pe.ca>, Suzuki K Poulose <Suzuki.Poulose@....com>, Steven Price
	<steven.price@....com>, Bjorn Helgaas <helgaas@...nel.org>, Catalin Marinas
	<catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>, Will Deacon
	<will@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>
Subject: Re: [PATCH v2 09/11] coco: guest: arm64: Wire Realm TDISP RUN/STOP
 transitions into guest driver

On Mon, 17 Nov 2025 19:30:05 +0530
"Aneesh Kumar K.V (Arm)" <aneesh.kumar@...nel.org> wrote:

> Teach the Arm CCA guest driver how to transition a Realm device between
> RUN and STOP states. The new helpers issue the RSI START/STOP calls,
> poll with CONTINUE until completion, and surface errors back to the TSM.
> The PCI TSM accept/unlock paths now invoke these helpers so writing `1`
> to `tsm/accept` correctly kicks off the TDISP RUN sequence and unlock
> tears it back down.
> 
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@...nel.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>