[PATCH v2] target/riscv: Restrict KVM-specific fields from ArchCPU

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

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

Restrict the KVM timer migration state. Rename the KVM timer
post_load() handler accordingly, because cpu_post_load() is
too generic.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
Since v1 https://lore.kernel.org/qemu-devel/20230405160454.97436-10-philmd@linaro.org/:
- Restrict whole vmstate_kvmtimer (thus drop Daniel's R-b)
---
 target/riscv/cpu.h     | 2 ++
 target/riscv/machine.c | 8 ++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index e3e08d315f..b1b56aa29e 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -363,12 +363,14 @@ 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 */
 };
 
 /*
diff --git a/target/riscv/machine.c b/target/riscv/machine.c
index 3ce2970785..d27f8a2a3a 100644
--- a/target/riscv/machine.c
+++ b/target/riscv/machine.c
@@ -199,7 +199,8 @@ static bool kvmtimer_needed(void *opaque)
     return kvm_enabled();
 }
 
-static int cpu_post_load(void *opaque, int version_id)
+#ifdef CONFIG_KVM
+static int cpu_kvmtimer_post_load(void *opaque, int version_id)
 {
     RISCVCPU *cpu = opaque;
     CPURISCVState *env = &cpu->env;
@@ -213,7 +214,7 @@ static const VMStateDescription vmstate_kvmtimer = {
     .version_id = 1,
     .minimum_version_id = 1,
     .needed = kvmtimer_needed,
-    .post_load = cpu_post_load,
+    .post_load = cpu_kvmtimer_post_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT64(env.kvm_timer_time, RISCVCPU),
         VMSTATE_UINT64(env.kvm_timer_compare, RISCVCPU),
@@ -221,6 +222,7 @@ static const VMStateDescription vmstate_kvmtimer = {
         VMSTATE_END_OF_LIST()
     }
 };
+#endif
 
 static bool debug_needed(void *opaque)
 {
@@ -409,7 +411,9 @@ const VMStateDescription vmstate_riscv_cpu = {
         &vmstate_vector,
         &vmstate_pointermasking,
         &vmstate_rv128,
+#ifdef CONFIG_KVM
         &vmstate_kvmtimer,
+#endif
         &vmstate_envcfg,
         &vmstate_debug,
         &vmstate_smstateen,
-- 
2.38.1