Merge tag 'pull-request-2024-03-18' of https://gitlab.com/thuth/qemu into staging

* Clarify s390x CPU topology docs and CPU compatibility error messages
* Improve the Sparc CPU help text
* Rename SOFTMMU to SYSTEM in the travis.yml file

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* tag 'pull-request-2024-03-18' of https://gitlab.com/thuth/qemu:
  travis-ci: Rename SOFTMMU -> SYSTEM
  target/sparc/cpu: Improve the CPU help text
  target/s390x: improve cpu compatibility check error message
  docs/s390: clarify even more that cpu-topology is KVM-only

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

docs/system/introduction.rst

@@ -1,6 +1,8 @@
 Introduction
 ============
 
+.. _Accelerators:
+
 Virtualisation Accelerators
 ---------------------------
 

docs/system/s390x/cpu-topology.rst

@@ -25,17 +25,19 @@ monitor polarization changes, see ``docs/devel/s390-cpu-topology.rst``.
 Prerequisites
 -------------
 
-To use the CPU topology, you need to run with KVM on a s390x host that
-uses the Linux kernel v6.0 or newer (which provide the so-called
+To use the CPU topology, you currently need to choose the KVM accelerator.
+See :ref:`Accelerators` for more details about accelerators and how to select them.
+
+The s390x host needs to use a Linux kernel v6.0 or newer (which provides the so-called
 ``KVM_CAP_S390_CPU_TOPOLOGY`` capability that allows QEMU to signal the
 CPU topology facility via the so-called STFLE bit 11 to the VM).
 
 Enabling CPU topology
 ---------------------
 
-Currently, CPU topology is only enabled in the host model by default.
+Currently, CPU topology is enabled by default only in the "host" CPU model.
 
-Enabling CPU topology in a CPU model is done by setting the CPU flag
+Enabling CPU topology in another CPU model is done by setting the CPU flag
 ``ctop`` to ``on`` as in:
 
 .. code-block:: bash
@@ -132,7 +134,7 @@ In the following machine we define 8 sockets with 4 cores each.
 
 .. code-block:: bash
 
-  $ qemu-system-s390x -m 2G \
+  $ qemu-system-s390x -accel kvm -m 2G \
     -cpu gen16b,ctop=on \
     -smp cpus=5,sockets=8,cores=4,maxcpus=32 \
     -device host-s390x-cpu,core-id=14 \
@@ -227,7 +229,7 @@ with vertical high entitlement.
 
 .. code-block:: bash
 
-  $ qemu-system-s390x -m 2G \
+  $ qemu-system-s390x -accel kvm -m 2G \
     -cpu gen16b,ctop=on \
     -smp cpus=1,sockets=8,cores=4,maxcpus=32 \
     \