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docs: add instructions to run virtio-fs as rootfs

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BUG=None
TEST=`./tools/dev_container ./tools/fmt` and mdbook build

Change-Id: I7fa86a9ad571ff15d8605c6a44e5a76547cb9f76
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4768222
Auto-Submit: Morg <morg@google.com>
Reviewed-by: Keiichi Watanabe <keiichiw@chromium.org>
Commit-Queue: Morg <morg@google.com>
This commit is contained in:
Federico 'Morg' Pareschi 2023-08-10 05:21:43 +00:00 committed by crosvm LUCI
parent fa2ab94c46
commit 8582fde1ce
1 changed files with 14 additions and 1 deletions
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15
docs/book/src/devices/fs.md
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@ -8,7 +8,7 @@ directory. You can also find a runnable sample in `tools/examples/example_fs`.
## Creating a Shared Directory on the Host Machine
Run following commands in host machine, to create a shared directory:
To create a shared directory, run the following commands in the host machine:
```sh
mkdir host_shared_dir
@ -39,3 +39,16 @@ mount -t virtiofs my_shared_tag /tmp/guest_shared_dir
You can now add files to the shared directory. Any files you put in the `guest_shared_dir` will
appear in the `host_shared_dir` on the host machine, and vice versa.
## Running VirtioFS as root filesystem
It is also possible to boot crosvm directly from a virtio-fs directory, as long as the directory
structure matches that of a valid rootfs. The outcome is similar to running a chroot but inside a
VM.
Running VMs with virtio-fs as root filesystem may not be ideal as performance will not be as good as
running a root disk with virtio-block, but it can be useful to run tests and debug while sharing
files between host and guest.
You can refer to the [advanced usage](../running_crosvm/advanced_usage.md#with-virtiofs) page for
the instructions on how to run virtio-fs as rootfs.