From: Catalin Marinas <catalin.marinas@arm.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
Cc: linux-coco@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Jason Gunthorpe <jgg@nvidia.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>,
Will Deacon <will@kernel.org>,
Steven Price <steven.price@arm.com>,
Suzuki K Poulose <Suzuki.Poulose@arm.com>,
Andre Przywara <andre.przywara@arm.com>
Subject: Re: [PATCH v11 7/7] coco: guest: arm64: Replace dummy CCA device with sysfs ABI
Date: Wed, 16 Sep 2026 11:57:17 +0100 [thread overview]
Message-ID: <aqp2DRInEhzpEqAc@arm.com> (raw)
In-Reply-To: <20260914060511.277948-8-aneesh.kumar@kernel.org>
On Mon, Sep 14, 2026 at 11:35:11AM +0530, Aneesh Kumar K.V (Arm) wrote:
> diff --git a/Documentation/ABI/testing/sysfs-firmware-cca b/Documentation/ABI/testing/sysfs-firmware-cca
> new file mode 100644
> index 000000000000..bf177d636b92
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-firmware-cca
> @@ -0,0 +1,10 @@
> +What: /sys/firmware/cca/realm_guest
> +Date: May 2026
> +Contact: Linux ARM Kernel Mailing list <linux-arm-kernel@lists.infradead.org>
> +Description: Read-only. Indicates whether the kernel is running as an
> + Arm Confidential Compute Architecture (CCA) Realm guest.
> +
> + The value is one of:
> +
> + 0: the kernel is not running as a Realm guest
> + 1: the kernel is running as a Realm guest
Does this file ever read as 0? It is created only if rsi_present and
always reads as 1. That's fine by me but we shouldn't document 0 as a
value. More like if present, it always reads 1 and RSI is present.
> diff --git a/drivers/firmware/arm_rmm/rsi.c b/drivers/firmware/arm_rmm/rsi.c
> index 2dd69febedbd..52f40256bd78 100644
> --- a/drivers/firmware/arm_rmm/rsi.c
> +++ b/drivers/firmware/arm_rmm/rsi.c
> @@ -9,12 +9,15 @@
> #include <linux/swiotlb.h>
> #include <linux/platform_device.h>
Nit: I think we can drop this include.
--
Catalin
next prev parent reply other threads:[~2026-09-16 10:57 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-14 6:05 [PATCH v11 0/7] Switch Arm SMCCC firmware services to an SMCCC bus Aneesh Kumar K.V (Arm)
2026-09-14 6:05 ` [PATCH v11 1/7] firmware: smccc: Add an Arm " Aneesh Kumar K.V (Arm)
2026-09-14 13:03 ` Catalin Marinas
2026-09-14 20:32 ` Jonathan Cameron
2026-09-14 22:28 ` Jason Gunthorpe
2026-09-15 9:22 ` Aneesh Kumar K.V
2026-09-15 11:46 ` Jason Gunthorpe
2026-09-23 16:43 ` Jonathan Cameron
2026-09-14 6:05 ` [PATCH v11 2/7] firmware: hwrng: arm_smccc_trng: Register as an SMCCC device Aneesh Kumar K.V (Arm)
2026-09-14 13:14 ` Catalin Marinas
2026-09-14 20:39 ` Jonathan Cameron
2026-09-24 12:23 ` Sudeep Holla
2026-09-14 6:05 ` [PATCH v11 3/7] firmware: arm_rmm: Move RSI support out of arch/arm64 Aneesh Kumar K.V (Arm)
2026-09-14 13:18 ` Catalin Marinas
2026-09-14 20:45 ` Jonathan Cameron
2026-09-16 10:58 ` Catalin Marinas
2026-09-14 6:05 ` [PATCH v11 4/7] arm64: realm: Move Realm memory encryption ops to RSI code Aneesh Kumar K.V (Arm)
2026-09-14 13:20 ` Catalin Marinas
2026-09-14 14:50 ` Suzuki K Poulose
2026-09-16 15:21 ` Suzuki K Poulose
2026-09-14 6:05 ` [PATCH v11 5/7] virt: coco: arm-cca-guest: Rename TSM report source file Aneesh Kumar K.V (Arm)
2026-09-14 13:23 ` Catalin Marinas
2026-09-14 15:06 ` Suzuki K Poulose
2026-09-14 20:48 ` Jonathan Cameron
2026-09-14 6:05 ` [PATCH v11 6/7] firmware: smccc: arm-cca-guest: Bind the TSM provider to an SMCCC device Aneesh Kumar K.V (Arm)
2026-09-14 13:42 ` Catalin Marinas
2026-09-14 20:51 ` Jonathan Cameron
2026-09-16 12:46 ` Jason Gunthorpe
2026-09-24 12:24 ` Sudeep Holla
2026-09-14 6:05 ` [PATCH v11 7/7] coco: guest: arm64: Replace dummy CCA device with sysfs ABI Aneesh Kumar K.V (Arm)
2026-09-14 13:48 ` Catalin Marinas
2026-09-14 21:00 ` Jonathan Cameron
2026-09-16 10:57 ` Catalin Marinas [this message]
2026-09-16 14:09 ` Aneesh Kumar K.V
2026-09-17 9:56 ` Catalin Marinas
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