void
fork_return(struct lwp *lp, struct trapframe *frame)
{
frame->tf_rax = 0; /* Child returns zero */
frame->tf_rflags &= ~PSL_C; /* success */
frame->tf_rdx = 1;
generic_lwp_return(lp, frame);
KTR_LOG(kernentry_fork_ret, lp->lwp_proc->p_pid, lp->lwp_tid);
}
/*
* vmm guest system call:
* - init the calling thread structure
* - prepare for running in non-root mode
*/
int
sys_vmm_guest_ctl(struct vmm_guest_ctl_args *uap)
{
int error = 0;
struct vmm_guest_options options;
struct trapframe *tf = uap->sysmsg_frame;
unsigned long stack_limit = USRSTACK;
unsigned char stack_page[PAGE_SIZE];
clear_quickret();
switch (uap->op) {
case VMM_GUEST_RUN:
error = copyin(uap->options, &options,
sizeof(struct vmm_guest_options));
if (error) {
kprintf("%s: error copyin vmm_guest_options\n",
__func__);
goto out;
}
while(stack_limit > tf->tf_sp) {
stack_limit -= PAGE_SIZE;
options.new_stack -= PAGE_SIZE;
error = copyin((const void *)stack_limit,
(void *)stack_page, PAGE_SIZE);
if (error) {
kprintf("%s: error copyin stack\n",
__func__);
goto out;
}
error = copyout((const void *)stack_page,
(void *)options.new_stack, PAGE_SIZE);
if (error) {
kprintf("%s: error copyout stack\n",
__func__);
goto out;
}
}
bcopy(tf, &options.tf, sizeof(struct trapframe));
error = vmm_vminit(&options);
if (error) {
if (error == ENODEV) {
kprintf("%s: vmm_vminit failed - "
"no VMM available \n", __func__);
goto out;
}
kprintf("%s: vmm_vminit failed\n", __func__);
goto out_exit;
}
generic_lwp_return(curthread->td_lwp, tf);
error = vmm_vmrun();
break;
default:
kprintf("%s: INVALID op\n", __func__);
error = EINVAL;
goto out;
}
out_exit:
exit1(W_EXITCODE(error, 0));
out:
return (error);
}