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VM: live update - check for regions above stack

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If the stack is not mapped at the VM_DATATOP (e.g. booted with
ac_layout = 1), there might be some more regions hiding above
the stack.  We also have to transfer those.

Change-Id: Idf3b94a36fcec8a10ace2f6dffe816faf0a88f60
This commit is contained in:
Dirk Vogt 2015-01-19 15:20:30 +01:00 committed by David van Moolenbroek
parent 8f4f859b35
commit a6db4d0a62
1 changed files with 28 additions and 0 deletions
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28
minix/servers/vm/utility.c
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@ -242,6 +242,12 @@ int swap_proc_dyn_data(struct vmproc *src_vmp, struct vmproc *dst_vmp,
printf("swap_proc_dyn_data: pt_map_in_range failed\n");
return r;
}
r = pt_map_in_range(src_vmp, dst_vmp, VM_STACKTOP, VM_DATATOP);
if(r != OK) {
printf("swap_proc_dyn_data: pt_map_in_range failed\n");
return r;
}
}
#if LU_DEBUG
@ -280,6 +286,28 @@ int swap_proc_dyn_data(struct vmproc *src_vmp, struct vmproc *dst_vmp,
}
}
/* If the stack is not mapped at the VM_DATATOP, there might be some
* more regions hiding above the stack. We also have to transfer
* those.
*/
if (VM_STACKTOP == VM_DATATOP)
return OK;
start_vr = region_search(&dst_vmp->vm_regions_avl, VM_STACKTOP, AVL_GREATER_EQUAL);
end_vr = region_search(&dst_vmp->vm_regions_avl, VM_DATATOP, AVL_LESS);
if(start_vr) {
#if LU_DEBUG
printf("VM: swap_proc_dyn_data: tranferring memory mapped regions from %d to %d\n",
dst_vmp->vm_endpoint, src_vmp->vm_endpoint);
#endif
assert(end_vr);
r = map_proc_copy_range(src_vmp, dst_vmp, start_vr, end_vr);
if(r != OK) {
return r;
}
}
return OK;
}