[xen master] SUPPORT.md: write down restriction of 32-bit tool stacks

[patchbot@xxxxxxx]

commit ea613d2367ac9dca3875997034e8f4aff74ab635
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Jun 19 15:45:07 2023 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Jun 19 15:45:07 2023 +0200

    SUPPORT.md: write down restriction of 32-bit tool stacks
    
    Let's try to avoid giving the impression that 32-bit tool stacks are as
    capable as 64-bit ones.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
 SUPPORT.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index c0aeb1f3f5..35a6249e03 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -168,6 +168,12 @@ ARM only has one guest type at the moment
 
 ## Toolstack
 
+While 32-bit builds of the tool stack are generally supported, restrictions
+apply in particular when running on top of a 64-bit hypervisor.  For example,
+very large guests aren't expected to be manageable in this case.  This includes
+guests giving the appearance of being large, by altering their own memory
+layouts.
+
 ### xl
 
     Status: Supported
--
generated by git-patchbot for /home/xen/git/xen.git#master