Function vm_snapshot_vm

freebsd/amd64/vmm/vmm.c:2793–2827

}

static int
vm_snapshot_vm(struct vm *vm, struct vm_snapshot_meta *meta)
{
	int ret;
	int i;
	uint64_t now;

	ret = 0;
	now = rdtsc();

	if (meta->op == VM_SNAPSHOT_SAVE) {
		/* XXX make tsc_offset take the value TSC proper as seen by the
		 * guest
		 */
		for (i = 0; i < VM_MAXCPU; i++)
			vm->vcpu[i].tsc_offset += now;
	}

	ret = vm_snapshot_vcpus(vm, meta);
	if (ret != 0) {
		printf("%s: failed to copy vm data to user buffer", __func__);
		goto done;
	}

	if (meta->op == VM_SNAPSHOT_SAVE) {
		/* XXX turn tsc_offset back into an offset; actual value is only
		 * required for restore; using it otherwise would be wrong
		 */
		for (i = 0; i < VM_MAXCPU; i++)
			vm->vcpu[i].tsc_offset -= now;
	}

done:
	return (ret);
}

static int
vm_snapshot_vmcx(struct vm *vm, struct vm_snapshot_meta *meta)