SUPPORT.md: Document speculative attacks status of non-shim 32-bit PV

This documents, but does not fix, XSA-370.

Reported-by: Jann Horn <jannh@google.com>
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Signed-off-by: George Dunlap <george.dunlap@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

diff --git a/SUPPORT.md b/SUPPORT.md
index 12e77ab66bb64127534128fd11e93c4ad17aa59d..cd786ac0c1cb083b915b48b272990dc15181f701 100644 (file)
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -80,7 +80,16 @@ Traditional Xen PV guest
 
 No hardware requirements
 
-    Status: Supported
+    Status, x86_64: Supported
+    Status, x86_32, shim: Supported
+    Status, x86_32, without shim: Supported, with caveats
+
+Due to architectural limitations,
+32-bit PV guests must be assumed to be able to read arbitrary host memory
+using speculative execution attacks.
+Advisories will continue to be issued
+for new vulnerabilities related to un-shimmed 32-bit PV guests
+enabling denial-of-service attacks or privilege escalation attacks.
 
 ### x86/HVM