[PATCH v5 3/4] SUPPORT.md: Add entry for guest PSCI SYSTEM_SUSPEND support

[Mykola Kvach <xakep.amatop@xxxxxxxxx>]

From: Mykola Kvach <mykola_kvach@xxxxxxxx>

Document support for the optional PSCI SYSTEM_SUSPEND function, exposed
via the virtual PSCI (vPSCI) interface to guests.

This allows non-hardware domain guests (domUs) to initiate system suspend
operations via PSCI calls. The feature is currently marked as Experimental.

Signed-off-by: Mykola Kvach <mykola_kvach@xxxxxxxx>
---
Changes in v5:
- Dropped ARM/PSCI entry: this refers to internal use of PSCI SMC calls,
  which is not relevant for SUPPORT.md
- Added a dedicated entry for PSCI SYSTEM_SUSPEND instead of generic guest
  PSCI info; guest PSCI support was documented in a separate patch
---
 SUPPORT.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index f0b5718e84..659b9c3052 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -956,6 +956,13 @@ by hwdom. Some platforms use SCMI for access to 
system-level resources.
 
     Status: Supported
 
+### ARM: Guest PSCI SYSTEM_SUSPEND support
+
+Support for the optional PSCI SYSTEM_SUSPEND function exposed via vPSCI.
+Allows non-hardware domain guests to initiate a system suspend.
+
+    Status: Experimental
+
 ## Virtual Hardware, QEMU
 
 This section describes supported devices available in HVM mode using a
-- 
2.48.1