[PATCH v4][PART 1 3/4] SUPPORT.md: Document ARM PSCI and vPSCI support

[Mykola Kvach <xakep.amatop@xxxxxxxxx>]

From: Mykola Kvach <mykola_kvach@xxxxxxxx>

Add a new entry under "Host hardware support" to document Xen's use of the
PSCI interface to interact with EL3 firmware via SMC calls. Supported PSCI
functions include CPU_ON, CPU_OFF, SYSTEM_RESET, and SYSTEM_OFF.
SYSTEM_SUSPEND is not yet supported.

Add a separate entry under "Virtual Hardware, Hypervisor" for vPSCI,
which describes the emulated PSCI interface exposed to guests.
SYSTEM_SUSPEND is not yet supported for hardware domain.

Signed-off-by: Mykola Kvach <mykola_kvach@xxxxxxxx>
---
 SUPPORT.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/SUPPORT.md b/SUPPORT.md
index e8fd0c251e..31ad4c96fd 100644
--- a/SUPPORT.md
+++ b/SUPPORT.md
@@ -73,6 +73,12 @@ For the Cortex A77 r0p0 - r1p0, see Errata 1508412.
     Status, x86 PV: Supported
     Status, ARM: Experimental
 
+### ARM/PSCI
+
+    Status: Supported
+
+SYSTEM_SUSPEND is not yet supported.
+
 ### Host EFI Boot
 
     Status, x86: Supported
@@ -946,6 +952,15 @@ by hwdom. Some platforms use SCMI for access to 
system-level resources.
 
     Status: Supported
 
+### Arm: vPSCI (virtual PSCI interface for guests)
+
+Emulated PSCI interface exposed to guests to support CPU_ON, CPU_OFF,
+SYSTEM_RESET, SYSTEM_OFF, etc.
+
+    Status: Supported
+
+SYSTEM_SUSPEND is not yet supported for hardware domain.
+
 ## Virtual Hardware, QEMU
 
 This section describes supported devices available in HVM mode using a
-- 
2.48.1