From nobody Tue Sep 9 05:50:29 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF82AC61DA3 for ; Fri, 24 Feb 2023 14:38:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229938AbjBXOiR (ORCPT ); Fri, 24 Feb 2023 09:38:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229634AbjBXOiQ (ORCPT ); Fri, 24 Feb 2023 09:38:16 -0500 Received: from ixit.cz (ip-89-177-23-149.bb.vodafone.cz [89.177.23.149]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E61A9671C5 for ; Fri, 24 Feb 2023 06:38:13 -0800 (PST) Received: from newone.lan (unknown [10.0.0.1]) (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 ixit.cz (Postfix) with ESMTPSA id 53FD4161ED2; Fri, 24 Feb 2023 15:38:11 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ixit.cz; s=dkim; t=1677249491; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=9fwVD4ucwH2c8weBti7L3KPNpxO0LVGqX+ym0nzws2k=; b=oraeAmBGBywq8pjgh103DdoByF2y1jGZZ0q5+lzAfmMUA2PdlAEr8XutxxAPAc9SF5Iz5K ZHfUv7cfu87cSYYVSQcBqSI3LyB9r9dZBXBsgucjHwYx1k1NMKE82eUiMKHx3TS8U4u3Mm fwCHZW0NdNT38rdXJilrk8/jsWm22Bo= From: David Heidelberg Cc: dri-devel@lists.freedesktop.org, helen.koike@collabora.com, Al Viro , Vivek Goyal , Stefan Hajnoczi , Miklos Szeredi , virtualization@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, wsa+renesas@sang-engineering.com, akpm@linux-foundation.org, David Heidelberg Subject: [RESEND v2 PATCH] init/do_mounts.c: add virtiofs root fs support Date: Fri, 24 Feb 2023 15:37:51 +0100 Message-Id: <20230224143751.36863-1-david@ixit.cz> X-Mailer: git-send-email 2.39.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Stefan Hajnoczi Make it possible to boot directly from a virtiofs file system with tag 'myfs' using the following kernel parameters: rootfstype=3Dvirtiofs root=3Dmyfs rw Booting directly from virtiofs makes it possible to use a directory on the host as the root file system. This is convenient for testing and situations where manipulating disk image files is cumbersome. Reviewed-by: Helen Koike Signed-off-by: Stefan Hajnoczi Signed-off-by: David Heidelberg --- v2: added Reviewed-by and CCed everyone interested. We have used this option in Mesa3D CI for testing crosvm for more than one years and it's proven to work reliably. We are working on effort to removing custom patches to be able to do=20 automated apply and test of patches from any tree. = =20 https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/.gitlab-ci/crosvm-runn= er.sh#L85 init/do_mounts.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/init/do_mounts.c b/init/do_mounts.c index 811e94daf0a8..11c11abe23d7 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -578,6 +578,16 @@ void __init mount_root(void) printk(KERN_ERR "VFS: Unable to mount root fs via SMB.\n"); return; } +#endif +#ifdef CONFIG_VIRTIO_FS + if (root_fs_names && !strcmp(root_fs_names, "virtiofs")) { + if (!do_mount_root(root_device_name, "virtiofs", + root_mountflags, root_mount_data)) + return; + + panic("VFS: Unable to mount root fs \"%s\" from virtiofs", + root_device_name); + } #endif if (ROOT_DEV =3D=3D 0 && root_device_name && root_fs_names) { if (mount_nodev_root() =3D=3D 0) --=20 2.39.1