i386/kvm: refactor xen init into a new function

Cosmetic - no new functionality added. Xen initialisation code is refactored
into its own function.

Signed-off-by: Ani Sinha <anisinha@redhat.com>
Link: https://lore.kernel.org/r/20260225035000.385950-12-anisinha@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/i386/kvm/kvm.c

@@ -3433,6 +3433,24 @@ bool kvm_arch_supports_vmfd_change(void)
     return true;
 }
 
+static int xen_init(MachineState *ms, KVMState *s)
+{
+#ifdef CONFIG_XEN_EMU
+    int ret = 0;
+    if (!object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE)) {
+        error_report("kvm: Xen support only available in PC machine");
+        return -ENOTSUP;
+    }
+    /* hyperv_enabled() doesn't work yet. */
+    uint32_t msr = XEN_HYPERCALL_MSR;
+    ret = kvm_xen_init(s, msr);
+    return ret;
+#else
+    error_report("kvm: Xen support not enabled in qemu");
+    return -ENOTSUP;
+#endif
+}
+
 int kvm_arch_init(MachineState *ms, KVMState *s)
 {
     int ret;
@@ -3467,21 +3485,10 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
     }
 
     if (s->xen_version) {
-#ifdef CONFIG_XEN_EMU
-        if (!object_dynamic_cast(OBJECT(ms), TYPE_PC_MACHINE)) {
-            error_report("kvm: Xen support only available in PC machine");
-            return -ENOTSUP;
-        }
-        /* hyperv_enabled() doesn't work yet. */
-        uint32_t msr = XEN_HYPERCALL_MSR;
-        ret = kvm_xen_init(s, msr);
+        ret = xen_init(ms, s);
         if (ret < 0) {
             return ret;
         }
-#else
-        error_report("kvm: Xen support not enabled in qemu");
-        return -ENOTSUP;
-#endif
     }
 
     ret = kvm_get_supported_msrs(s);