treewide: replace qemu_hw_version() with QEMU_HW_VERSION

The version is never set on 2.5+ machine types, so qemu_hw_version() and
qemu_set_hw_version() are not needed anymore.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/ide/core.c

@@ -2660,7 +2660,7 @@ int ide_init_drive(IDEState *s, IDEDevice *dev, IDEDriveKind kind, Error **errp)
     if (dev->version) {
         pstrcpy(s->version, sizeof(s->version), dev->version);
     } else {
-        pstrcpy(s->version, sizeof(s->version), qemu_hw_version());
+        pstrcpy(s->version, sizeof(s->version), QEMU_HW_VERSION);
     }
 
     ide_reset(s);

hw/scsi/megasas.c

@@ -782,7 +782,7 @@ static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
 
     memcpy(info.product_name, base_class->product_name, 24);
     snprintf(info.serial_number, 32, "%s", s->hba_serial);
-    snprintf(info.package_version, 0x60, "%s-QEMU", qemu_hw_version());
+    snprintf(info.package_version, 0x60, "%s-QEMU", QEMU_HW_VERSION);
     memcpy(info.image_component[0].name, "APP", 3);
     snprintf(info.image_component[0].version, 10, "%s-QEMU",
              base_class->product_version);

hw/scsi/scsi-bus.c

@@ -703,7 +703,7 @@ static bool scsi_target_emulate_inquiry(SCSITargetReq *r)
         r->buf[7] = 0x10 | (r->req.bus->info->tcq ? 0x02 : 0); /* Sync, TCQ.  */
         memcpy(&r->buf[8], "QEMU    ", 8);
         memcpy(&r->buf[16], "QEMU TARGET     ", 16);
-        pstrcpy((char *) &r->buf[32], 4, qemu_hw_version());
+        pstrcpy((char *) &r->buf[32], 4, QEMU_HW_VERSION);
     }
     return true;
 }

hw/scsi/scsi-disk.c

@@ -2543,7 +2543,7 @@ static void scsi_realize(SCSIDevice *dev, Error **errp)
     }
 
     if (!s->version) {
-        s->version = g_strdup(qemu_hw_version());
+        s->version = g_strdup(QEMU_HW_VERSION);
     }
     if (!s->vendor) {
         s->vendor = g_strdup("QEMU");

include/hw/core/boards.h

@@ -197,11 +197,6 @@ typedef struct {
  *    used to provide @cpu_index to socket number mapping, allowing
  *    a machine to group CPU threads belonging to the same socket/package
  *    Returns: socket number given cpu_index belongs to.
- * @hw_version:
- *    Value of QEMU_VERSION when the machine was added to QEMU.
- *    Set only by old machines because they need to keep
- *    compatibility on code that exposed QEMU_VERSION to guests in
- *    the past (and now use qemu_hw_version()).
  * @possible_cpu_arch_ids:
  *    Returns an array of @CPUArchId architecture-dependent CPU IDs
  *    which includes CPU IDs for present and possible to hotplug CPUs.
@@ -297,7 +292,6 @@ struct MachineClass {
     const char *default_display;
     const char *default_nic;
     GPtrArray *compat_props;
-    const char *hw_version;
     ram_addr_t default_ram_size;
     const char *default_cpu_type;
     bool default_kernel_irqchip_split;

include/qemu/hw-version.h

@@ -1,5 +1,5 @@
 /*
- * QEMU "hardware version" machinery
+ * QEMU "hardware version" constant
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
@@ -8,20 +8,10 @@
 #define QEMU_HW_VERSION_H
 
 /*
- * Starting on QEMU 2.5, qemu_hw_version() returns "2.5+" by default
- * instead of QEMU_VERSION, so setting hw_version on MachineClass
- * is no longer mandatory.
- *
- * Do NOT change this string, or it will break compatibility on all
- * machine classes that don't set hw_version.
+ * Starting on QEMU 2.5, devices with a version string in their
+ * identification data return "2.5+" instead of QEMU_VERSION.  Do
+ * NOT change this string as it is visible to guests.
  */
 #define QEMU_HW_VERSION "2.5+"
 
-/* QEMU "hardware version" setting. Used to replace code that exposed
- * QEMU_VERSION to guests in the past and need to keep compatibility.
- * Do not use qemu_hw_version() in new code.
- */
-void qemu_set_hw_version(const char *);
-const char *qemu_hw_version(void);
-
 #endif

system/vl.c

@@ -2212,10 +2212,6 @@ static void qemu_create_machine(QDict *qdict)
 
     cpu_exec_init_all();
 
-    if (machine_class->hw_version) {
-        qemu_set_hw_version(machine_class->hw_version);
-    }
-
     /*
      * Get the default machine options from the machine if it is not already
      * specified either by the configuration file or by the command line.

target/s390x/cpu_models.c

@@ -955,7 +955,7 @@ static void s390_qemu_cpu_model_class_init(ObjectClass *oc, const void *data)
 
     xcc->is_migration_safe = true;
     xcc->desc = g_strdup_printf("QEMU Virtual CPU version %s",
-                                qemu_hw_version());
+                                QEMU_HW_VERSION);
 }
 
 static void s390_max_cpu_model_class_init(ObjectClass *oc, const void *data)

util/osdep.c

@@ -31,8 +31,6 @@
 #include "qemu/hw-version.h"
 #include "monitor/monitor.h"
 
-static const char *hw_version = QEMU_HW_VERSION;
-
 int socket_set_cork(int fd, int v)
 {
 #if defined(SOL_TCP) && defined(TCP_CORK)
@@ -533,16 +531,6 @@ ssize_t qemu_send_full(int s, const void *buf, size_t count)
     return total;
 }
 
-void qemu_set_hw_version(const char *version)
-{
-    hw_version = version;
-}
-
-const char *qemu_hw_version(void)
-{
-    return hw_version;
-}
-
 #ifdef _WIN32
 static void socket_cleanup(void)
 {