This adds the saving and restore of the current Multi-Processing state
of the machine. While the KVM_GET/SET_MP_STATE API exposes a number of
potential states for x86 we only use two for ARM. Either the process is
running or not. We then save this state into the cpu_powered TCG state
to avoid changing the serialisation format.
Signed-off-by: Alex Bennée <alex.bennee@xxxxxxxxxx>
---
v2
- make mpstate field runtime dependant (kvm_enabled())
- drop initial KVM_CAP_MP_STATE requirement
- re-use cpu_powered instead of new field
diff --git a/target-arm/machine.c b/target-arm/machine.c
index 9446e5a..185f9a2 100644
--- a/target-arm/machine.c
+++ b/target-arm/machine.c
@@ -161,6 +161,7 @@ static const VMStateInfo vmstate_cpsr = {
.put = put_cpsr,
};
+
static void cpu_pre_save(void *opaque)
{
ARMCPU *cpu = opaque;
@@ -170,6 +171,20 @@ static void cpu_pre_save(void *opaque)
/* This should never fail */
abort();
}
+#if defined CONFIG_KVM
+ if (kvm_check_extension(CPU(cpu)->kvm_state, KVM_CAP_MP_STATE)) {
+ struct kvm_mp_state mp_state;
+ int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MP_STATE, &mp_state);
+ if (ret) {
+ fprintf(stderr, "%s: failed to get MP_STATE %d/%s\n",
+ __func__, ret, strerror(ret));
+ abort();
+ }
+ cpu->powered_off =
+ (mp_state.mp_state == KVM_MP_STATE_RUNNABLE)
+ ? false : true;
+ }
+#endif
} else {
if (!write_cpustate_to_list(cpu)) {
/* This should never fail. */
@@ -222,6 +237,20 @@ static int cpu_post_load(void *opaque, int version_id)
* we're using it.
*/
write_list_to_cpustate(cpu);
+#if defined CONFIG_KVM
+ if (kvm_check_extension(CPU(cpu)->kvm_state, KVM_CAP_MP_STATE)) {
+ struct kvm_mp_state mp_state = {
+ .mp_state =
+ cpu->powered_off ? KVM_MP_STATE_HALTED : KVM_MP_STATE_RUNNABLE
+ };
+ int ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_MP_STATE, &mp_state);
+ if (ret) {
+ fprintf(stderr, "%s: failed to set MP_STATE %d/%s\n",
+ __func__, ret, strerror(ret));
+ return -1;
+ }
+ }
+#endif
} else {
if (!write_list_to_cpustate(cpu)) {
return -1;
--
2.3.1
--
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