[xen staging] SUPPORT.md: add xen-9pfsd

[patchbot@xxxxxxx]

commit 08bb338f09a54d3b39f0d952bbd67461d8e5d0ed
Author:     Juergen Gross <jgross@xxxxxxxx>
AuthorDate: Thu Mar 7 09:18:04 2024 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Mar 7 09:18:04 2024 +0100

    SUPPORT.md: add xen-9pfsd
    
    Add a support statement for the new xen-9pfsd backend. Set it to
    "Experimental", as some functionality for Linux guests is missing
    (only tested to work with Xenstore-stubdom).
    
    Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 SUPPORT.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index 7eb6875cfa..510bb02190 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -665,6 +665,7 @@ there is currently no xl support.
 ### PV 9pfs (backend)
 
     Status, QEMU: Tech Preview
+    Status, xen-9pfsd: Experimental
 
 ### PVCalls (backend)
 
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