On Fri, Feb 24, 2023 at 03:37:51PM +0100, David Heidelberg wrote: > From: Stefan Hajnoczi <stefanha@xxxxxxxxxx> > > Make it possible to boot directly from a virtiofs file system with tag > 'myfs' using the following kernel parameters: > > rootfstype=virtiofs root=myfs 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 <helen.koike@xxxxxxxxxxxxx> > Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx> > Signed-off-by: David Heidelberg <david@xxxxxxx> > --- > 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 > automated apply and test of patches from any tree. > > https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/.gitlab-ci/crosvm-runner.sh#L85 > init/do_mounts.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) Vivek, do you remember where we ended up with boot from virtiofs? I thought a different solution was merged some time ago. There is documentation from the virtiofs community here: https://virtio-fs.gitlab.io/howto-boot.html Stefan > > 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 == 0 && root_device_name && root_fs_names) { > if (mount_nodev_root() == 0) > -- > 2.39.1 >
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