[pve-devel] [PATCH pve-docs] added shared filesystem doc for virtio-fs & virtio-9p

[Markus Frank <m.frank@proxmox.com>]

Signed-off-by: Markus Frank <m.frank@proxmox.com>
---
 qm.adoc | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/qm.adoc b/qm.adoc
index 4d0c7c4..bd0e2f3 100644
--- a/qm.adoc
+++ b/qm.adoc
@@ -909,6 +909,56 @@ recommended to always use a limiter to avoid guests using too many host
 resources. If desired, a value of '0' for `max_bytes` can be used to disable
 all limits.
 
+[[qm_sharedfiles]]
+Shared Filesystems
+~~~~~~~~~~~~~~~~~~
+
+9pfs (virtio-9p)
+^^^^^^^^^^^^^^^^
+
+QEMU's 9pfs uses the Plan 9 Filesystem Protocol to share a directory on the host
+with a guest VM.
+
+To share a directory with 9p, run the following command:
+
+----
+qm set <vmid> -sharedfiles0 virtio-9p,path=<directory>,tag=<mount tag>
+----
+
+To mount QEMU's 9pfs in a guest VM with the Linux kernel 9p driver, run the
+following command:
+
+----
+mount -t 9p -o trans=virtio,version=9p2000.L <mount tag> <mount point>
+----
+
+https://www.linux-kvm.org/page/9p_virtio
+
+https://wiki.qemu.org/Documentation/9psetup
+
+virtio-fs
+^^^^^^^^^
+
+Virtio-fs is a shared file system, that enables sharing between host and 
+guest VM while taking advantage of the locality of virtual machines and the
+hypervisor to get a higher throughput than 9p.
+Numa must be disabled to use virtio-fs.
+
+To share a directory with virtio-fs, run the following command:
+
+----
+qm set <vmid> -sharedfiles0 virtio-fs,path=<directory>,tag=<mount tag>
+----
+
+To mount virtio-fs in a guest VM with the Linux kernel virtiofs driver, run the
+following command:
+
+----
+mount -t virtiofs <mount tag> <mount point>
+----
+
+https://virtio-fs.gitlab.io/howto-qemu.html
+
 [[qm_bootorder]]
 Device Boot Order
 ~~~~~~~~~~~~~~~~~
-- 
2.30.2