[1/2] hw/i386: Remove unuseful kvmclock_create() stub

Commit Message

Philippe Mathieu-Daudé June 20, 2023, 8:32 a.m. UTC

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 <[e-mail]>
---
 include/hw/kvm/clock.h | 10 ----------
 hw/i386/kvm/clock.c    |  4 +++-
 hw/i386/microvm.c      |  4 +++-
 hw/i386/pc_piix.c      |  2 +-
 hw/i386/pc_q35.c       |  4 +++-
 5 files changed, 10 insertions(+), 14 deletions(-)

Comments

Alex Bennée June 20, 2023, 12:32 p.m. UTC | #1

Philippe Mathieu-Daudé <[e-mail]> writes:

> 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 <[e-mail]>

Reviewed-by: Alex Bennée <[e-mail]>

Patch

diff --git a/include/hw/kvm/clock.h b/include/hw/kvm/clock.h
index 7994071c4f..3efe0a871c 100644
--- a/include/hw/kvm/clock.h
+++ b/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
diff --git a/hw/i386/kvm/clock.c b/hw/i386/kvm/clock.c
index df70b4a033..0824c6d313 100644
--- a/hw/i386/kvm/clock.c
+++ b/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) |
diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c
index 7227a2156c..6b762bc18e 100644
--- a/hw/i386/microvm.c
+++ b/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;
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 44146e6ff5..715c063eec 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -193,7 +193,7 @@  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);
     }
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index a9a59ed42b..a0553f70f7 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -184,7 +184,9 @@  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) {