Merge tag 'pull-request-2023-10-20' of https://gitlab.com/thuth/qemu into staging

* s390x CPU topology support
* Simplify the KVM register synchronization code
* Disable the analyze-migration.py test on s390x

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* tag 'pull-request-2023-10-20' of https://gitlab.com/thuth/qemu: (24 commits)
  tests/qtest/migration-test: Disable the analyze-migration.py test on s390x
  target/s390x/kvm: Simplify the GPRs, ACRs, CRs and prefix synchronization code
  target/s390x/kvm: Turn KVM_CAP_SYNC_REGS into a hard requirement
  tests/avocado: s390x cpu topology bad move
  tests/avocado: s390x cpu topology dedicated errors
  tests/avocado: s390x cpu topology test socket full
  tests/avocado: s390x cpu topology test dedicated CPU
  tests/avocado: s390x cpu topology entitlement tests
  tests/avocado: s390x cpu topology polarization
  tests/avocado: s390x cpu topology core
  docs/s390x/cpu topology: document s390x cpu topology
  qapi/s390x/cpu topology: add query-s390x-cpu-polarization command
  qapi/s390x/cpu topology: CPU_POLARIZATION_CHANGE QAPI event
  machine: adding s390 topology to info hotpluggable-cpus
  machine: adding s390 topology to query-cpu-fast
  qapi/s390x/cpu topology: set-cpu-topology qmp command
  target/s390x/cpu topology: activate CPU topology
  s390x/cpu topology: interception of PTF instruction
  s390x/cpu topology: resetting the Topology-Change-Report
  s390x/sclp: reporting the maximum nested topology entries
  ...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

2 files changed, 171 insertions, 0 deletions

diff --git a/docs/devel/index-internals.rst b/docs/devel/index-internals.rst
index e1a93df263..6f81df92bc 100644
--- a/docs/devel/index-internals.rst
+++ b/docs/devel/index-internals.rst
@@ -14,6 +14,7 @@ Details about QEMU's various subsystems including how to add features to them.
    migration
    multi-process
    reset
+   s390-cpu-topology
    s390-dasd-ipl
    tracing
    vfio-migration
diff --git a/docs/devel/s390-cpu-topology.rst b/docs/devel/s390-cpu-topology.rst
new file mode 100644
index 0000000000..9eab28d5e5
--- /dev/null
+++ b/docs/devel/s390-cpu-topology.rst
@@ -0,0 +1,170 @@
+QAPI interface for S390 CPU topology
+====================================
+
+The following sections will explain the QAPI interface for S390 CPU topology
+with the help of exemplary output.
+For this, let's assume that QEMU has been started with the following
+command, defining 4 CPUs, where CPU[0] is defined by the -smp argument and will
+have default values:
+
+.. code-block:: bash
+
+ qemu-system-s390x \
+    -enable-kvm \
+    -cpu z14,ctop=on \
+    -smp 1,drawers=3,books=3,sockets=2,cores=2,maxcpus=36 \
+    -device z14-s390x-cpu,core-id=19,entitlement=high \
+    -device z14-s390x-cpu,core-id=11,entitlement=low \
+    -device z14-s390x-cpu,core-id=112,entitlement=high \
+   ...
+
+Additions to query-cpus-fast
+----------------------------
+
+The command query-cpus-fast allows querying the topology tree and
+modifiers for all configured vCPUs.
+
+.. code-block:: QMP
+
+ { "execute": "query-cpus-fast" }
+ {
+  "return": [
+    {
+      "dedicated": false,
+      "thread-id": 536993,
+      "props": {
+        "core-id": 0,
+        "socket-id": 0,
+        "drawer-id": 0,
+        "book-id": 0
+      },
+      "cpu-state": "operating",
+      "entitlement": "medium",
+      "qom-path": "/machine/unattached/device[0]",
+      "cpu-index": 0,
+      "target": "s390x"
+    },
+    {
+      "dedicated": false,
+      "thread-id": 537003,
+      "props": {
+        "core-id": 19,
+        "socket-id": 1,
+        "drawer-id": 0,
+        "book-id": 2
+      },
+      "cpu-state": "operating",
+      "entitlement": "high",
+      "qom-path": "/machine/peripheral-anon/device[0]",
+      "cpu-index": 19,
+      "target": "s390x"
+    },
+    {
+      "dedicated": false,
+      "thread-id": 537004,
+      "props": {
+        "core-id": 11,
+        "socket-id": 1,
+        "drawer-id": 0,
+        "book-id": 1
+      },
+      "cpu-state": "operating",
+      "entitlement": "low",
+      "qom-path": "/machine/peripheral-anon/device[1]",
+      "cpu-index": 11,
+      "target": "s390x"
+    },
+    {
+      "dedicated": true,
+      "thread-id": 537005,
+      "props": {
+        "core-id": 112,
+        "socket-id": 0,
+        "drawer-id": 3,
+        "book-id": 2
+      },
+      "cpu-state": "operating",
+      "entitlement": "high",
+      "qom-path": "/machine/peripheral-anon/device[2]",
+      "cpu-index": 112,
+      "target": "s390x"
+    }
+  ]
+ }
+
+
+QAPI command: set-cpu-topology
+------------------------------
+
+The command set-cpu-topology allows modifying the topology tree
+or the topology modifiers of a vCPU in the configuration.
+
+.. code-block:: QMP
+
+    { "execute": "set-cpu-topology",
+      "arguments": {
+         "core-id": 11,
+         "socket-id": 0,
+         "book-id": 0,
+         "drawer-id": 0,
+         "entitlement": "low",
+         "dedicated": false
+      }
+    }
+    {"return": {}}
+
+The core-id parameter is the only mandatory parameter and every
+unspecified parameter keeps its previous value.
+
+QAPI event CPU_POLARIZATION_CHANGE
+----------------------------------
+
+When a guest requests a modification of the polarization,
+QEMU sends a CPU_POLARIZATION_CHANGE event.
+
+When requesting the change, the guest only specifies horizontal or
+vertical polarization.
+It is the job of the entity administrating QEMU to set the dedication and fine
+grained vertical entitlement in response to this event.
+
+Note that a vertical polarized dedicated vCPU can only have a high
+entitlement, giving 6 possibilities for vCPU polarization:
+
+- Horizontal
+- Horizontal dedicated
+- Vertical low
+- Vertical medium
+- Vertical high
+- Vertical high dedicated
+
+Example of the event received when the guest issues the CPU instruction
+Perform Topology Function PTF(0) to request an horizontal polarization:
+
+.. code-block:: QMP
+
+  {
+    "timestamp": {
+      "seconds": 1687870305,
+      "microseconds": 566299
+    },
+    "event": "CPU_POLARIZATION_CHANGE",
+    "data": {
+      "polarization": "horizontal"
+    }
+  }
+
+QAPI query command: query-s390x-cpu-polarization
+------------------------------------------------
+
+The query command query-s390x-cpu-polarization returns the current
+CPU polarization of the machine.
+In this case the guest previously issued a PTF(1) to request vertical polarization:
+
+.. code-block:: QMP
+
+    { "execute": "query-s390x-cpu-polarization" }
+    {
+        "return": {
+          "polarization": "vertical"
+        }
+    }