Re: [PATCH v13 7/8] coco: guest: arm64: Add sysfs ABI for CCA Realm guests
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From: Suzuki K Poulose <suzuki.poulose@arm.com>
Date: 2026-09-23 15:08:29
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linux-coco, lkml
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 (local) Reviewed-by: Jonathan Cameron <redacted> 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>