[PULL 11/23] kvm: refactor core virtual machine creation into its own function

[Paolo Bonzini <pbonzini@redhat.com>]

From: Ani Sinha <anisinha@redhat.com>

Refactoring the core logic around KVM_CREATE_VM into its own separate function
so that it can be called from other functions in subsequent patches. There is
no functional change in this patch.

CC: pbonzini@redhat.com
CC: zhao1.liu@intel.com
Signed-off-by: Ani Sinha <anisinha@redhat.com>
Link: https://lore.kernel.org/r/20240808113838.1697366-1-anisinha@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 accel/kvm/kvm-all.c | 89 ++++++++++++++++++++++++++++-----------------
 1 file changed, 56 insertions(+), 33 deletions(-)

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 4c920b7bfe7..e06cf3a4157 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2381,6 +2381,60 @@ uint32_t kvm_dirty_ring_size(void)
     return kvm_state->kvm_dirty_ring_size;
 }
 
+static int do_kvm_create_vm(MachineState *ms, int type)
+{
+    KVMState *s;
+    int ret;
+
+    s = KVM_STATE(ms->accelerator);
+
+    do {
+        ret = kvm_ioctl(s, KVM_CREATE_VM, type);
+    } while (ret == -EINTR);
+
+    if (ret < 0) {
+        error_report("ioctl(KVM_CREATE_VM) failed: %s", strerror(-ret));
+
+#ifdef TARGET_S390X
+        if (ret == -EINVAL) {
+            error_printf("Host kernel setup problem detected."
+                         " Please verify:\n");
+            error_printf("- for kernels supporting the"
+                        " switch_amode or user_mode parameters, whether");
+            error_printf(" user space is running in primary address space\n");
+            error_printf("- for kernels supporting the vm.allocate_pgste"
+                         " sysctl, whether it is enabled\n");
+        }
+#elif defined(TARGET_PPC)
+        if (ret == -EINVAL) {
+            error_printf("PPC KVM module is not loaded. Try modprobe kvm_%s.\n",
+                         (type == 2) ? "pr" : "hv");
+        }
+#endif
+    }
+
+    return ret;
+}
+
+static int find_kvm_machine_type(MachineState *ms)
+{
+    MachineClass *mc = MACHINE_GET_CLASS(ms);
+    int type;
+
+    if (object_property_find(OBJECT(current_machine), "kvm-type")) {
+        g_autofree char *kvm_type;
+        kvm_type = object_property_get_str(OBJECT(current_machine),
+                                           "kvm-type",
+                                           &error_abort);
+        type = mc->kvm_type(ms, kvm_type);
+    } else if (mc->kvm_type) {
+        type = mc->kvm_type(ms, NULL);
+    } else {
+        type = kvm_arch_get_default_type(ms);
+    }
+    return type;
+}
+
 static int kvm_init(MachineState *ms)
 {
     MachineClass *mc = MACHINE_GET_CLASS(ms);
@@ -2463,45 +2517,14 @@ static int kvm_init(MachineState *ms)
     }
     s->as = g_new0(struct KVMAs, s->nr_as);
 
-    if (object_property_find(OBJECT(current_machine), "kvm-type")) {
-        g_autofree char *kvm_type = object_property_get_str(OBJECT(current_machine),
-                                                            "kvm-type",
-                                                            &error_abort);
-        type = mc->kvm_type(ms, kvm_type);
-    } else if (mc->kvm_type) {
-        type = mc->kvm_type(ms, NULL);
-    } else {
-        type = kvm_arch_get_default_type(ms);
-    }
-
+    type = find_kvm_machine_type(ms);
     if (type < 0) {
         ret = -EINVAL;
         goto err;
     }
 
-    do {
-        ret = kvm_ioctl(s, KVM_CREATE_VM, type);
-    } while (ret == -EINTR);
-
+    ret = do_kvm_create_vm(ms, type);
     if (ret < 0) {
-        error_report("ioctl(KVM_CREATE_VM) failed: %s", strerror(-ret));
-
-#ifdef TARGET_S390X
-        if (ret == -EINVAL) {
-            error_printf("Host kernel setup problem detected."
-                         " Please verify:\n");
-            error_printf("- for kernels supporting the"
-                        " switch_amode or user_mode parameters, whether");
-            error_printf(" user space is running in primary address space\n");
-            error_printf("- for kernels supporting the vm.allocate_pgste"
-                         " sysctl, whether it is enabled\n");
-        }
-#elif defined(TARGET_PPC)
-        if (ret == -EINVAL) {
-            error_printf("PPC KVM module is not loaded. Try modprobe kvm_%s.\n",
-                         (type == 2) ? "pr" : "hv");
-        }
-#endif
         goto err;
     }
 
-- 
2.46.1