hw/i386: Remove unuseful kvmclock_create() stub

We shouldn't call kvmclock_create() when KVM is not available
or disabled:
 - check for kvm_enabled() before calling it
 - assert KVM is enabled once called
Since the call is elided when KVM is not available, we can
remove the stub (it is never compiled).

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230620083228.88796-2-philmd@linaro.org>

hw/i386/kvm/clock.c

@@ -332,8 +332,10 @@ void kvmclock_create(bool create_always)
 {
     X86CPU *cpu = X86_CPU(first_cpu);
 
-    if (!kvm_enabled() || !kvm_has_adjust_clock())
+    assert(kvm_enabled());
+    if (!kvm_has_adjust_clock()) {
         return;
+    }
 
     if (create_always ||
         cpu->env.features[FEAT_KVM] & ((1ULL << KVM_FEATURE_CLOCKSOURCE) |

hw/i386/microvm.c

@@ -180,7 +180,9 @@ static void microvm_devices_init(MicrovmMachineState *mms)
         x86ms->ioapic2 = ioapic_init_secondary(gsi_state);
     }
 
-    kvmclock_create(true);
+    if (kvm_enabled()) {
+        kvmclock_create(true);
+    }
 
     mms->virtio_irq_base = 5;
     mms->virtio_num_transports = 8;

hw/i386/pc_piix.c

@@ -192,7 +192,7 @@ static void pc_init1(MachineState *machine,
     pc_machine_init_sgx_epc(pcms);
     x86_cpus_init(x86ms, pcmc->default_cpu_version);
 
-    if (pcmc->kvmclock_enabled) {
+    if (kvm_enabled() && pcmc->kvmclock_enabled) {
         kvmclock_create(pcmc->kvmclock_create_always);
     }
 

hw/i386/pc_q35.c

@@ -183,7 +183,9 @@ static void pc_q35_init(MachineState *machine)
     pc_machine_init_sgx_epc(pcms);
     x86_cpus_init(x86ms, pcmc->default_cpu_version);
 
-    kvmclock_create(pcmc->kvmclock_create_always);
+    if (kvm_enabled()) {
+        kvmclock_create(pcmc->kvmclock_create_always);
+    }
 
     /* pci enabled */
     if (pcmc->pci_enabled) {

include/hw/kvm/clock.h

@@ -13,16 +13,6 @@
 #ifndef HW_KVM_CLOCK_H
 #define HW_KVM_CLOCK_H
 
-#ifdef CONFIG_KVM
-
 void kvmclock_create(bool create_always);
 
-#else /* CONFIG_KVM */
-
-static inline void kvmclock_create(bool create_always)
-{
-}
-
-#endif /* !CONFIG_KVM */
-
 #endif