Add secure-boot to s390-ccw-virtio machine type option

Add secure-boot as a parameter of s390-ccw-virtio machine type option.

The `secure-boot=on|off` parameter is implemented to enable secure IPL.

By default, secure-boot is set to false if not specified in
the command line.

Signed-off-by: Zhuoying Cai <zycai@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Collin Walling <walling@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20260730214624.2328883-28-zycai@linux.ibm.com
Signed-off-by: Eric Farman <farman@linux.ibm.com>

docs/system/s390x/secure-ipl.rst

@@ -19,20 +19,32 @@ Note: certificate files must have a .pem extension.
 
     qemu-system-s390x -machine s390-ccw-virtio,boot-certs.0.path=/.../qemu/certs,boot-certs.1.path=/another/path/cert.pem ...
 
+Enabling Secure IPL
+^^^^^^^^^^^^^^^^^^^
+
+Secure IPL is enabled by explicitly setting ``secure-boot=on``; if not
+specified, secure boot is considered off.
+
+.. code-block:: shell
+
+    qemu-system-s390x -machine s390-ccw-virtio,secure-boot=on|off
+
 
 IPL Modes
 ---------
 
 Multiple IPL modes are available to differentiate between the various IPL
-configurations. These modes are mutually exclusive and enabled based on the
-``boot-certs`` option on the QEMU command line.
+configurations. These modes are mutually exclusive and enabled based on specific
+combinations of the ``secure-boot`` and ``boot-certs`` options on the QEMU
+command line.
 
 Normal Mode
 ^^^^^^^^^^^
 
-The absence of certificates will attempt to IPL a guest without secure IPL
-operations. No checks are performed, and no warnings/errors are reported.
-This is the default mode.
+The absence of both certificates and the ``secure-boot`` option will attempt to
+IPL a guest without secure IPL operations. No checks are performed, and no
+warnings/errors are reported.  This is the default mode, and can be explicitly
+enabled with ``secure-boot=off``.
 
 Configuration:
 

hw/s390x/s390-virtio-ccw.c

@@ -817,6 +817,27 @@ static void machine_set_boot_certs(Object *obj, Visitor *v, const char *name,
     ms->boot_certs = cert_list;
 }
 
+static inline bool machine_get_secure_boot(Object *obj, Error **errp)
+{
+    S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
+
+    return ms->secure_boot;
+}
+
+static inline void machine_set_secure_boot(Object *obj, bool value,
+                                            Error **errp)
+{
+    S390CcwMachineClass *s390mc = S390_CCW_MACHINE_GET_CLASS(obj);
+    S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
+
+    if (!s390mc->use_secure) {
+        error_setg(errp, "secure-boot is not supported by this machine version");
+        return;
+    }
+
+    ms->secure_boot = value;
+}
+
  /*
   * S390x-specific global compatibility properties.
   *
@@ -843,6 +864,7 @@ static void ccw_machine_class_init(ObjectClass *oc, const void *data)
     s390mc->max_threads = 1;
     s390mc->use_cpi = true;
     s390mc->use_certs = true;
+    s390mc->use_secure = true;
     mc->reset = s390_machine_reset;
     mc->block_default_type = IF_VIRTIO;
     mc->no_cdrom = 1;
@@ -891,6 +913,12 @@ static void ccw_machine_class_init(ObjectClass *oc, const void *data)
                               machine_get_boot_certs, machine_set_boot_certs, NULL, NULL);
     object_class_property_set_description(oc, "boot-certs",
             "provide paths to a directory and/or a certificate file for secure boot");
+
+    object_class_property_add_bool(oc, "secure-boot",
+                                   machine_get_secure_boot,
+                                   machine_set_secure_boot);
+    object_class_property_set_description(oc, "secure-boot",
+            "enable/disable secure boot");
 }
 
 static inline void s390_machine_initfn(Object *obj)
@@ -979,6 +1007,7 @@ static void ccw_machine_11_1_class_options(MachineClass *mc)
     S390CcwMachineClass *s390mc = S390_CCW_MACHINE_CLASS(mc);
 
     s390mc->use_certs = false;
+    s390mc->use_secure = false;
 
     ccw_machine_11_2_class_options(mc);
     compat_props_add(mc->compat_props, hw_compat_11_1, hw_compat_11_1_len);

include/hw/s390x/s390-virtio-ccw.h

@@ -29,6 +29,7 @@ struct S390CcwMachineState {
     bool aes_key_wrap;
     bool dea_key_wrap;
     bool pv;
+    bool secure_boot;
     uint8_t loadparm[8];
     uint64_t memory_limit;
     uint64_t max_pagesize;
@@ -58,6 +59,7 @@ struct S390CcwMachineClass {
     int max_threads;
     bool use_cpi;
     bool use_certs;
+    bool use_secure;
 };
 
 #endif

qemu-options.hx

@@ -47,7 +47,8 @@ DEF("machine", HAS_ARG, QEMU_OPTION_machine, \
     "                cxl-fmw.0.targets.0=firsttarget,cxl-fmw.0.targets.1=secondtarget,cxl-fmw.0.size=size[,cxl-fmw.0.interleave-granularity=granularity]\n"
     "                sgx-epc.0.memdev=memid,sgx-epc.0.node=numaid\n"
     "                smp-cache.0.cache=cachename,smp-cache.0.topology=topologylevel\n"
-    "                boot-certs.0.path=/path/directory,boot-certs.1.path=/path/file provides paths to a directory and/or a certificate file\n",
+    "                boot-certs.0.path=/path/directory,boot-certs.1.path=/path/file provides paths to a directory and/or a certificate file\n"
+    "                secure-boot=on|off enable/disable secure boot (default=off)\n",
     QEMU_ARCH_ALL)
 SRST
 ``-machine [type=]name[,prop=value[,...]]``
@@ -218,6 +219,9 @@ SRST
 
     ``boot-certs.0.path=/path/directory,boot-certs.1.path=/path/file``
         Provide paths to a directory and/or a certificate file on the host [s390x only].
+
+    ``secure-boot=on|off``
+        Enables or disables secure boot on s390-ccw guest. The default is off.
 ERST
 
 DEF("M", HAS_ARG, QEMU_OPTION_M,