From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>,
linux-coco@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: Jason Gunthorpe <jgg@nvidia.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Greg KH <gregkh@linuxfoundation.org>,
Jeremy Linton <jeremy.linton@arm.com>,
Jonathan Cameron <jic23@kernel.org>,
Lorenzo Pieralisi <lpieralisi@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Sudeep Holla <sudeep.holla@kernel.org>,
Will Deacon <will@kernel.org>,
Steven Price <steven.price@arm.com>,
Andre Przywara <andre.przywara@arm.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Nathan Chancellor <nathan@kernel.org>,
Nicolas Schier <nsc@kernel.org>,
Olivia Mackall <olivia@selenic.com>,
Russell King <linux@armlinux.org.uk>,
Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Subject: Re: [PATCH v13 7/8] coco: guest: arm64: Add sysfs ABI for CCA Realm guests
Date: Wed, 23 Sep 2026 16:08:24 +0100 [thread overview]
Message-ID: <c8819aea-d0a2-45ea-a4dc-54e2f9aa2df8@arm.com> (raw)
In-Reply-To: <20260923140405.1111554-8-aneesh.kumar@kernel.org>
On 23/09/2026 15:04, Aneesh Kumar K.V (Arm) wrote:
> Userspace has used the arm-cca-dev platform device to detect Arm CCA
> Realm guests. Removing it without a replacement would break that
> detection and would also leave userspace depending on kernel
> device-model details.
>
> Add /sys/firmware/cca/realm_guest as a stable ABI for detecting whether
> the kernel is running as an Arm CCA Realm guest. Create the file only in
> Realm world, where it reads 1.
>
> Document the new ABI in Documentation/ABI/testing/sysfs-firmware-cca.
>
> Link: https://lore.kernel.org/all/4a7d84b2-2ec4-4773-a2d5-7b63d5c683cf@arm.com
> Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
next prev parent reply other threads:[~2026-09-23 15:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-23 14:03 [PATCH v13 0/8] Switch Arm SMCCC firmware services to an SMCCC bus Aneesh Kumar K.V (Arm)
2026-09-23 14:03 ` [PATCH v13 1/8] firmware: smccc: Add an Arm " Aneesh Kumar K.V (Arm)
2026-09-23 14:03 ` [PATCH v13 2/8] firmware: hwrng: arm_smccc_trng: Register as an SMCCC device Aneesh Kumar K.V (Arm)
2026-09-23 14:04 ` [PATCH v13 3/8] firmware: arm_rmm: Move RSI support out of arch/arm64 Aneesh Kumar K.V (Arm)
2026-09-23 14:04 ` [PATCH v13 4/8] arm64: realm: Move Realm memory encryption ops to RSI code Aneesh Kumar K.V (Arm)
2026-09-23 14:04 ` [PATCH v13 5/8] virt: coco: arm-cca-guest: Rename TSM report source file Aneesh Kumar K.V (Arm)
2026-09-23 14:04 ` [PATCH v13 6/8] firmware: smccc: arm-cca-guest: Bind the TSM provider to an SMCCC device Aneesh Kumar K.V (Arm)
2026-09-23 15:06 ` Suzuki K Poulose
2026-09-23 14:04 ` [PATCH v13 7/8] coco: guest: arm64: Add sysfs ABI for CCA Realm guests Aneesh Kumar K.V (Arm)
2026-09-23 15:08 ` Suzuki K Poulose [this message]
2026-09-23 14:04 ` [PATCH v13 8/8] coco: guest: arm64: Remove dummy CCA platform device Aneesh Kumar K.V (Arm)
2026-09-23 15:09 ` Suzuki K Poulose
2026-09-24 16:16 ` [PATCH v13 0/8] Switch Arm SMCCC firmware services to an SMCCC bus Catalin Marinas
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