feat(mem/mpu): add support for locked entries on the vmpu

Add functionality to lock entries on the vMPU to prevent hypervisor
MPU entries from being removed.

Signed-off-by: Daniel Oliveira <[email protected]>

Author: danielRep

src/core/mpu/mem.c

@@ -468,7 +468,6 @@ bool mem_map(struct addr_space* as, struct mp_region* mpr, bool broadcast, bool
     spin_lock(&as->lock);
 
     if (mem_vmpu_find_overlapping_region(as, mpr) == INVALID_MPID) {
-        // TODO: check if it possible to merge with another region
         mpid_t mpid = mem_vmpu_allocate_entry(as);
         if (mpid != INVALID_MPID) {
             mapped = mem_vmpu_insert_region(as, mpid, mpr, broadcast, locked);

src/core/vm.c

@@ -130,7 +130,7 @@ static void vm_install_image(struct vm* vm, struct vm_mem_region* reg)
 
     size_t img_num_pages = NUM_PAGES(vm->config->image.size);
     struct ppages img_ppages = mem_ppages_get(vm->config->image.load_addr, img_num_pages);
-    vaddr_t src_va = mem_alloc_map(&cpu()->as, SEC_HYP_GLOBAL, &img_ppages, INVALID_VA,
+    vaddr_t src_va = mem_alloc_map(&cpu()->as, SEC_HYP_PRIVATE, &img_ppages, INVALID_VA,
         img_num_pages, PTE_HYP_FLAGS);
     vaddr_t dst_va =
         mem_map_cpy(&vm->as, &cpu()->as, vm->config->image.base_addr, INVALID_VA, img_num_pages);