From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9FBBF26ED46; Mon, 15 Jun 2026 20:03:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781553783; cv=none; b=enWuBJQj3qNIg2FMW3n5ouS95Q7WiixcrcxxxBabYy1bl+VS5AzsmYZXSEEnZOHxbLtRfRtxEiN6vuxWTS8kxdk/RSFojgzu1gxKJQNoGbt50CeYV2zxkS9GosVo19bqn/s8kR19BWj0cgwJfsKTVzd+TSnICs5E+Fqv63oFoYU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781553783; c=relaxed/simple; bh=6auKCxQAwBHrJU78gjyHu6aVt0oJaJ+SJzzvhSX5rlU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=DReO5u/JZTAF/XvgZPR7LBz1WO6T0ljF9DjCjMwBh95ghJ5gAC9WKyZuDb2Co7H2MHzMLVhvuoF4bl6aNDOSLfxmrYqMVGQvg7Z+BEcuLkSy2LOZu1O1nvDm5G8ilrwC0rbGW7APpUXaumykOK0XZEOkSHGWxgJqjLOTORvT8BI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=p7ufdKPY; arc=none smtp.client-ip=198.37.111.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="p7ufdKPY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1781553780; bh=6auKCxQAwBHrJU78gjyHu6aVt0oJaJ+SJzzvhSX5rlU=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=p7ufdKPY+OeiDfeZOJTgDDoz8YT3yS3oOfE2fGu3SE9r7vxjQnSVGea+U1MxJeSJS 7aowLu+1z4ydd4/jXMzUFu+6oNaXNhf8atpnI2KJSbFU5TW8xDPU2CYvN/LBVFPB0s /AC9FTyC7fjhcXh9gud2xD+SBPpXcyFKOGLT3e/4= Received: from lingrow.int.hansenpartnership.com (unknown [IPv6:2601:5c4:4300:d341::8c71]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lamorak.hansenpartnership.com (Postfix) with ESMTPSA id DAEDB1C02E4; Mon, 15 Jun 2026 16:02:59 -0400 (EDT) Message-ID: <0158c89cffd76c621607f66d1889ccc084754729.camel@HansenPartnership.com> Subject: Re: [PATCH 08/19] parisc: define DPS root partition type UUID From: James Bottomley To: Vincent Mailhol , Jens Axboe , Davidlohr Bueso , Alexander Viro , Christian Brauner , Jan Kara Cc: linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-efi@vger.kernel.org, linux-fsdevel@vger.kernel.org, Helge Deller , linux-parisc@vger.kernel.org Date: Mon, 15 Jun 2026 16:02:59 -0400 In-Reply-To: <20260615-discoverable-root_partitions-v1-8-39c78fac42e2@kernel.org> References: <20260615-discoverable-root_partitions-v1-0-39c78fac42e2@kernel.org> <20260615-discoverable-root_partitions-v1-8-39c78fac42e2@kernel.org> Autocrypt: addr=James.Bottomley@HansenPartnership.com; keydata=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 6bNYvTvufGF0pi2irCbYLp86ZeIkFnHqSEF9Gpy1S83YOU4Hp0V/kj7VBP1NEG9x4bPDTUTgaLTGNYoAHo4ggwB2c9wNUXNpcl2UAAl2N+D+XIm0DLGJ9+Ubw2dcnd6XAaqgGyjzhcE1ZbNtzlUqZq3OFgs69e1/MOG7iY0+//PtLUdO1GC4jQ2UflFUHNK9/PJuKf2HKwTf/6vcLQcnbGI4fO5w0CYbTdrO3NlgMxNspBbhtCp4PkwnFPry8Fi7wy3N8h7jWVIulv+qXCrWqDSJASUEGAECAA8FAlR2FpkCGwwFCQDtTgAACgkQgUrkfCFIVNbdiAf8DIkvauUK8auQtxqz3g0P0+afRxSVWs+XvBUZwhX7ojievDq7j1PKo0yaxhqbZimN6u8kaBu8hszOgcUJESLpH1fJSzDnDsYJGhZ6DDZuVliLkDnbF7nTT79Gu4b/8wp861VSi27c367sVxdpgCD2Bth4Y1kJXvS8j5ycWCrQAQlF2OJ3N8JZUo+Np9OjuMd4XFftDbaRR9Y6QzPOGgNsWDSM+FVg2IRek3JcLCKvO8oDtu8XBk+VGRt+KFqJcMTtAohS1DXSLmTDgL2uoMrDHwXQ9pYNEX2AZop3v8gkYclppz85xInfrPGCQ2AuxVfkZSugnYZplxHtb1WmmPkf4LhSBGS5HJMTCCqGSM49AwEHAgME7JKiaexbZKQCle/XNQFoPfx0USPQtB4MQx1ITtubV+et2MBi3R/8K1tRSINo+h1CTap4fM4/rAD/YrquuPA0hYkBPQQYAQgAJwMbIAQWIQTVYG5zyLRicb6tmt+BSuR8IUhU1gUCaXZkiAUJF4lK9QAKCRCBSuR8IUhU1t6CCACFp/Wk55zQu2MQAvzXSexcBczROJSLUiNL8hRejgidulGRb/nvvxgsPQkdKxvxi02LFcU2jeFK5TuuRvebZozJ0LDJsECWJ0CHUoWzN+FZ/j0IG4qPgGSD1DIdfwGft AHBLpBdnl9SOe8ETkv6GqbZrXUED/dAbRVIT5vHP51zyYB8rAUjp3PnzxsXFG8eQaacEyKSl0DKDlgKuQ+k292LVGJhEva8z4cwg3JcrQWzbpTRskQRP624aQ7t0LKbNfXqfYT13TvZNTDdjQaCJRJ3EG8uXOszVKuc0guXunZPmmq6x1Y3bOfOezcFYoywwL3nKef+Z5sQrjG3/5NLeu+W Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-06-15 at 18:09 +0200, Vincent Mailhol wrote: > DPS [1] assigns GPT partition type UUIDs to operating system > partitions. Root partitions use architecture-specific type UUIDs so > the OS can discover the intended root filesystem without relying on a > root=3D cmdline option. >=20 > Define DPS_ROOT_PARTITION_TYPE_UUID in asm/dps_root.h for parisc and > select ARCH_HAS_DPS_ROOT_PARTITION_TYPE_UUID. >=20 > [1] The Discoverable Partitions Specification (DPS) > Link: > https://uapi-group.org/specifications/specs/discoverable_partitions_speci= fication/ How are you planning to make this work for parisc? Some systems have a PALO boot partition (fdisk type 0xf0) but the more modern way is to place palo inside a hidden ext4 inode in /boot. The way parisc IODC works is very similar to the way MSDOS boots with the palo location table in the first block so I theorize that would probably work for gpt partitions as well ... I'm just not sure anyone has tested it. However, to get this to work with PALO for auto discovery, you'd need palo patches to recognize the DPS UUID and no-one seems to have submitted anything to palo for this. Regards, James