/*===========================================================================*
* rs_memctl_make_vm_instance *
*===========================================================================*/
static int rs_memctl_make_vm_instance(struct vmproc *new_vm_vmp)
{
int r;
u32_t flags;
int verify;
struct vmproc *this_vm_vmp;
this_vm_vmp = &vmproc[VM_PROC_NR];
pt_assert(&this_vm_vmp->vm_pt);
/* Check if the operation is allowed. */
assert(num_vm_instances == 1 || num_vm_instances == 2);
if(num_vm_instances == 2) {
printf("VM can currently support no more than 2 VM instances at the time.");
return EPERM;
}
/* Copy settings from current VM. */
new_vm_vmp->vm_flags |= VMF_VM_INSTANCE;
num_vm_instances++;
/* Pin memory for the new VM instance. */
r = map_pin_memory(new_vm_vmp);
if(r != OK) {
return r;
}
/* Preallocate page tables for the entire address space for both
* VM and the new VM instance.
*/
flags = 0;
verify = FALSE;
r = pt_ptalloc_in_range(&this_vm_vmp->vm_pt,
VM_OWN_HEAPBASE, VM_DATATOP, flags, verify);
if(r != OK) {
return r;
}
r = pt_ptalloc_in_range(&new_vm_vmp->vm_pt,
VM_OWN_HEAPBASE, VM_DATATOP, flags, verify);
if(r != OK) {
return r;
}
/* Let the new VM instance map VM's page tables and its own. */
r = pt_ptmap(this_vm_vmp, new_vm_vmp);
if(r != OK) {
return r;
}
r = pt_ptmap(new_vm_vmp, new_vm_vmp);
if(r != OK) {
return r;
}
pt_assert(&this_vm_vmp->vm_pt);
pt_assert(&new_vm_vmp->vm_pt);
return OK;
}
/*===========================================================================*
* rs_memctl_make_vm_instance *
*===========================================================================*/
static int rs_memctl_make_vm_instance(struct vmproc *new_vm_vmp)
{
int r;
u32_t flags;
int verify;
struct vmproc *this_vm_vmp;
this_vm_vmp = &vmproc[VM_PROC_NR];
/* Pin memory for the new VM instance. */
r = map_pin_memory(new_vm_vmp);
if(r != OK) {
return r;
}
/* Preallocate page tables for the entire address space for both
* VM and the new VM instance.
*/
flags = 0;
verify = FALSE;
r = pt_ptalloc_in_range(&this_vm_vmp->vm_pt, 0, 0, flags, verify);
if(r != OK) {
return r;
}
r = pt_ptalloc_in_range(&new_vm_vmp->vm_pt, 0, 0, flags, verify);
if(r != OK) {
return r;
}
/* Let the new VM instance map VM's page tables and its own. */
r = pt_ptmap(this_vm_vmp, new_vm_vmp);
if(r != OK) {
return r;
}
r = pt_ptmap(new_vm_vmp, new_vm_vmp);
if(r != OK) {
return r;
}
return OK;
}
