[xen staging] SUPPORT.md: PV display frontend is unsupported in "backend allocation" mode

[patchbot@xxxxxxx]

commit 2dd2cd0f16aae2cad2227f9aae9469fd6cdd8cd3
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Feb 16 15:31:59 2021 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 16 15:31:59 2021 +0100

    SUPPORT.md: PV display frontend is unsupported in "backend allocation" mode
    
    This wasn't meant to be supported, but wasn't stated this way.
    
    This is XSA-363.
    
    Reported-by: Jan Belich <jbeulich@xxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 SUPPORT.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/SUPPORT.md b/SUPPORT.md
index f69edc7ba4..4cb5ec9802 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -415,7 +415,8 @@ Guest-side driver capable of speaking the Xen PV 
Framebuffer protocol
 
 Guest-side driver capable of speaking the Xen PV display protocol
 
-    Status, Linux: Supported
+    Status, Linux: Supported (outside of "backend allocation" mode)
+    Status, Linux: Experimental (in "backend allocation" mode)
 
 ### PV Console (frontend)
 
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