[PATCH 03/12] coco: guest: arm64: Drop dummy RSI platform device stub

Aneesh Kumar K.V (Arm)
2025-10-27T09:50:17Z

The SMCCC firmware driver now creates the `arm-smccc` platform device
and also creates the CCA auxiliary devices once the RSI ABI is
discovered. This makes the arch-specific arm64_create_dummy_rsi_dev()
helper redundant. Remove the arm-cca-dev platform device registration
and let the SMCCC probe manage the RSI device.

systemd match on platform:arm-cca-dev for confidential vm detection [1].
Losing the platform device registration can break that. Keeping this
removal in its own change makes it easy to revert if that regression
blocks the rollout.

[1] https://lore.kernel.org/all/4a7d84b2-2ec4-4773-a2d5-7b63d5c683cf@arm.com

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
---
arch/arm64/kernel/rsi.c | 15 ---------------
1 file changed, 15 deletions(-)

diff --git a/arch/arm64/kernel/rsi.c b/arch/arm64/kernel/rsi.c
index 5d711942e543..1b716d18b80e 100644
--- a/arch/arm64/kernel/rsi.c
+++ b/arch/arm64/kernel/rsi.c
@@ -158,18 +158,3 @@ void __init arm64_rsi_init(void)

static_branch_enable(&rsi_present);
}
-
-static struct platform_device rsi_dev = {
- .name = "arm-cca-dev",
- .id = PLATFORM_DEVID_NONE
-};
-
-static int __init arm64_create_dummy_rsi_dev(void)
-{
- if (is_realm_world() &&
- platform_device_register(&rsi_dev))
- pr_err("failed to register rsi platform device\n");
- return 0;
-}
-
-arch_initcall(arm64_create_dummy_rsi_dev)
--
2.43.0