From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 530CD4EBAC6 for ; Wed, 16 Sep 2026 10:57:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789556251; cv=none; b=pxH6PRTQI+SCyj0yzfJkSHmhsFqW8ALN3FpYqjaKoYpWn44PJbP7frjZqPhVXP6g0luEtV6dwDfytRERGWa0RyOjJjZKs+64vHd9snjp1/TeZQ0wflPtt0TIA1Vzgm59BUTMsRbYahvRrC1OTsFcD9/xOinN1SAWYvFId4ubMBw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789556251; c=relaxed/simple; bh=5sS8Pv43xatXOJ2DntYftUU17HocoYWUvGVZRmaQXc8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ff2ySVAf2u+uZqENskaqdZTX20jJq6d70BGcisfFFMrdcR+2Wcd6TcJ7OXsEiMqbEOhyobzgT3/zZquGD80iEj6MWBmNcfxeanZneuDJxRlYOLAXNizhWx143HjonZ3b9ikDrs4+KgOuBw5P9YJYLgRuNwVs9e/+kG4f3Oy3DME= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=jl/i1j2p; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="jl/i1j2p" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 05199152B; Wed, 16 Sep 2026 03:57:19 -0700 (PDT) Received: from arm.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 6A8FF3F882; Wed, 16 Sep 2026 03:57:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1789556242; bh=5sS8Pv43xatXOJ2DntYftUU17HocoYWUvGVZRmaQXc8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=jl/i1j2p1BX6BhBdjYRtagyYym1tFDsOw2ZvjpvW4sBBGK2hfgGcE5xfFemcxgGrZ tYLQoj0zI+daIGgWA8BUzAQe08huBUV6J1EQQL0HHMfhY/nOhYOE2c9GfcuPORFpgQ ab6D4JzJCZVKhcrhm9Zzeo1e1UuerEsN9kzJ07Ug= Date: Wed, 16 Sep 2026 11:57:17 +0100 From: Catalin Marinas To: "Aneesh Kumar K.V (Arm)" Cc: linux-coco@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Jason Gunthorpe , Greg KH , Jeremy Linton , Jonathan Cameron , Lorenzo Pieralisi , Mark Rutland , Sudeep Holla , Will Deacon , Steven Price , Suzuki K Poulose , Andre Przywara Subject: Re: [PATCH v11 7/7] coco: guest: arm64: Replace dummy CCA device with sysfs ABI Message-ID: References: <20260914060511.277948-1-aneesh.kumar@kernel.org> <20260914060511.277948-8-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 > +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 > #include Nit: I think we can drop this include. -- Catalin