static void kvmclock_vm_state_change(void *opaque, int running, RunState state) { KVMClockState *s = opaque; CPUState *cpu; int cap_clock_ctrl = kvm_check_extension(kvm_state, KVM_CAP_KVMCLOCK_CTRL); int ret; if (running) { struct kvm_clock_data data = {}; uint64_t time_at_migration = kvmclock_current_nsec(s); s->clock_valid = false; /* We can't rely on the migrated clock value, just discard it */ if (time_at_migration) { s->clock = time_at_migration; } data.clock = s->clock; ret = kvm_vm_ioctl(kvm_state, KVM_SET_CLOCK, &data); if (ret < 0) { fprintf(stderr, "KVM_SET_CLOCK failed: %s\n", strerror(ret)); abort(); } if (!cap_clock_ctrl) { return; } CPU_FOREACH(cpu) { ret = kvm_vcpu_ioctl(cpu, KVM_KVMCLOCK_CTRL, 0); if (ret) { if (ret != -EINVAL) { fprintf(stderr, "%s: %s\n", __func__, strerror(-ret)); } return; } } } else { struct kvm_clock_data data; int ret; if (s->clock_valid) { return; } kvm_synchronize_all_tsc(); ret = kvm_vm_ioctl(kvm_state, KVM_GET_CLOCK, &data); if (ret < 0) { fprintf(stderr, "KVM_GET_CLOCK failed: %s\n", strerror(ret)); abort(); } s->clock = data.clock; /* * If the VM is stopped, declare the clock state valid to * avoid re-reading it on next vmsave (which would return * a different value). Will be reset when the VM is continued. */ s->clock_valid = true; } }
static void kvmclock_vm_state_change(void *opaque, int running, RunState state) { KVMClockState *s = opaque; CPUState *cpu; int cap_clock_ctrl = kvm_check_extension(kvm_state, KVM_CAP_KVMCLOCK_CTRL); int ret; if (running) { struct kvm_clock_data data = {}; uint64_t time_at_migration = kvmclock_current_nsec(s); s->clock_valid = false;   if (time_at_migration) { s->clock = time_at_migration; } data.clock = s->clock; ret = kvm_vm_ioctl(kvm_state, KVM_SET_CLOCK, &data); if (ret < 0) { fprintf(stderr, "KVM_SET_CLOCK failed: %s\n", strerror(ret)); abort(); } if (!cap_clock_ctrl) { return; } CPU_FOREACH(cpu) { ret = kvm_vcpu_ioctl(cpu, KVM_KVMCLOCK_CTRL, 0); if (ret) { if (ret != -EINVAL) { fprintf(stderr, "%s: %s\n", __func__, strerror(-ret)); } return; } } } else { struct kvm_clock_data data; int ret; if (s->clock_valid) { return; } kvm_synchronize_all_tsc(); ret = kvm_vm_ioctl(kvm_state, KVM_GET_CLOCK, &data); if (ret < 0) { fprintf(stderr, "KVM_GET_CLOCK failed: %s\n", strerror(ret)); abort(); } s->clock = data.clock;   s->clock_valid = true; } }