2 files changed, 16 insertions, 2 deletions

diff --git a/docs/system/arm/bananapi_m2u.rst b/docs/system/arm/bananapi_m2u.rst
index b09ba5c548..587b488655 100644
--- a/docs/system/arm/bananapi_m2u.rst
+++ b/docs/system/arm/bananapi_m2u.rst
@@ -22,7 +22,10 @@ The Banana Pi M2U machine supports the following devices:
  * EMAC ethernet
  * GMAC ethernet
  * Clock Control Unit
+ * SATA
  * TWI (I2C)
+ * USB 2.0
+ * Hardware Watchdog
 
 Limitations
 """""""""""
@@ -31,9 +34,7 @@ Currently, Banana Pi M2U does *not* support the following features:
 
 - Graphical output via HDMI, GPU and/or the Display Engine
 - Audio output
-- Hardware Watchdog
 - Real Time Clock
-- USB 2.0 interfaces
 
 Also see the 'unimplemented' array in the Allwinner R40 SoC module
 for a complete list of unimplemented I/O devices: ``./hw/arm/allwinner-r40.c``
diff --git a/docs/system/arm/virt.rst b/docs/system/arm/virt.rst
index c245c52b7a..26fcba00b7 100644
--- a/docs/system/arm/virt.rst
+++ b/docs/system/arm/virt.rst
@@ -69,6 +69,19 @@ Supported guest CPU types:
 Note that the default is ``cortex-a15``, so for an AArch64 guest you must
 specify a CPU type.
 
+Also, please note that passing ``max`` CPU (i.e. ``-cpu max``) won't
+enable all the CPU features for a given ``virt`` machine. Where a CPU
+architectural feature requires support in both the CPU itself and in the
+wider system (e.g. the MTE feature), it may not be enabled by default,
+but instead requires a machine option to enable it.
+
+For example, MTE support must be enabled with ``-machine virt,mte=on``,
+as well as by selecting an MTE-capable CPU (e.g., ``max``) with the
+``-cpu`` option.
+
+See the machine-specific options below, or check them for a given machine
+by passing the ``help`` suboption, like: ``-machine virt-9.0,help``.
+
 Graphics output is available, but unlike the x86 PC machine types
 there is no default display device enabled: you should select one from
 the Display devices section of "-device help". The recommended option