[xen staging] SUPPORT.md: clarify support of booting 32-bit Xen on ARMv8

[patchbot@xxxxxxx]

commit cd53ee9c41f991bbca75641e647005e013a3eac0
Author:     Michal Orzel <michal.orzel@xxxxxxx>
AuthorDate: Thu Feb 29 13:13:52 2024 +0100
Commit:     Julien Grall <jgrall@xxxxxxxxxx>
CommitDate: Wed Mar 6 09:39:45 2024 +0000

    SUPPORT.md: clarify support of booting 32-bit Xen on ARMv8
    
    Since commit bd1001db0af1 ("xen/arm: arm32: Allow Xen to boot on
    unidentified CPUs"), it's been possible to boot 32-bit Xen on ARMv8A CPUs
    in AArch32 state (assuming HW supports EL2 execution in AArch32). Clarify
    the support statement and mark it as Tech Preview, as this use case is
    uncommon and hasn't really been tested/hardened.
    
    Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 SUPPORT.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/SUPPORT.md b/SUPPORT.md
index a90d1108c9..7eb6875cfa 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -37,7 +37,8 @@ supported in this document.
 
 ### ARM v8
 
-    Status: Supported
+    Status, Xen in AArch64 mode: Supported
+    Status, Xen in AArch32 mode: Tech Preview
     Status, Cortex A57 r0p0-r1p1: Supported, not security supported
     Status, Cortex A77 r0p0-r1p0: Supported, not security supported
 
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