[RFC PATCH 09/10] target/riscv: Restrict KVM-specific fields from ArchCPU

[Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>]

These fields shouldn't be accessed when KVM is not available.

Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
---
RFC: The migration part is likely invalid...

kvmtimer_needed() is defined in target/riscv/machine.c as

  static bool kvmtimer_needed(void *opaque)
  {
      return kvm_enabled();
  }

which depends on a host feature.
---
 target/riscv/cpu.h     | 2 ++
 target/riscv/machine.c | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 638e47c75a..82939235ab 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -377,12 +377,14 @@ struct CPUArchState {
     hwaddr kernel_addr;
     hwaddr fdt_addr;
 
+#ifdef CONFIG_KVM
     /* kvm timer */
     bool kvm_timer_dirty;
     uint64_t kvm_timer_time;
     uint64_t kvm_timer_compare;
     uint64_t kvm_timer_state;
     uint64_t kvm_timer_frequency;
+#endif /* CONFIG_KVM */
 };
 
 OBJECT_DECLARE_CPU_TYPE(RISCVCPU, RISCVCPUClass, RISCV_CPU)
diff --git a/target/riscv/machine.c b/target/riscv/machine.c
index 9c455931d8..e45d564ec3 100644
--- a/target/riscv/machine.c
+++ b/target/riscv/machine.c
@@ -201,10 +201,12 @@ static bool kvmtimer_needed(void *opaque)
 
 static int cpu_post_load(void *opaque, int version_id)
 {
+#ifdef CONFIG_KVM
     RISCVCPU *cpu = opaque;
     CPURISCVState *env = &cpu->env;
 
     env->kvm_timer_dirty = true;
+#endif
     return 0;
 }
 
@@ -215,9 +217,11 @@ static const VMStateDescription vmstate_kvmtimer = {
     .needed = kvmtimer_needed,
     .post_load = cpu_post_load,
     .fields = (VMStateField[]) {
+#ifdef CONFIG_KVM
         VMSTATE_UINT64(env.kvm_timer_time, RISCVCPU),
         VMSTATE_UINT64(env.kvm_timer_compare, RISCVCPU),
         VMSTATE_UINT64(env.kvm_timer_state, RISCVCPU),
+#endif
         VMSTATE_END_OF_LIST()
     }
 };
-- 
2.38.1