IBM AIX Continuous Availability Features - IBM Redbooks

}
printf("hardware keyset after KERNEXT =%016lx\n",hwset);
/*
* Add kkey=KKEY_VMM to the current keyset. This is the key we will be
* using to protect our memory pages
*/
if ((rc=kkeyset_add_key(myset, kkey ,KA_RW))!=0){
printf("kkeyset_add_key() failed\n");
return -1;
}
if ((rc=kkeyset_to_hkeyset(myset, &hwset))!=0){
printf("kkeyset_tohkeyset() failed: rc=%lx\n",rc);
return -1;
}
printf("hardware keyset after KKEY_VMM=%016lx\n",hwset);
/*
* Create a heap protected by the key KKEY_VMM
*/
bzero(&heapattr, sizeof(heapattr));
heapattr.hpa_eyec=EYEC_HEAPATTR;
heapattr.hpa_version=HPA_VERSION;
heapattr.hpa_flags=HPA_PINNED|HPA_SHARED;
heapattr.hpa_debug_level=HPA_DEFAULT_DEBUG;
/*
* The heap will be protected by key==heapattr.hpa_kkey=KKEY_VMM
* So other extensions/components should have KKEY_VMM in their keyset in
* order to access it.
*/
heapattr.hpa_kkey=kkey;
if ((rc=heap_create(&heapattr, &my_heap))!=0 ){
printf("heap_create() failed\n");
return -1;
}
/*
* Add current keyset={KKEYSET_KERNEXT, KKEY_VMM} to the current kernel
* extension/system-call. This will be done through the help of a Protection
* Gate. If you dont do this you will not be able to access the private heap
* created in line#75 as thats protected by key KKEY_VMM
*/
oldhwset=hkeyset_replace(hwset);
/*
* Assign a page from our private kernel heap which is protected by
* keyset={KKEYSET_KERNEXT, KKEY_VMM}.
*/
caddr_t page=xmalloc(4096, 12, my_heap);
if (page==NULL){
printf("xmalloc() failed");
return -1;
}
/* Test KA_READ access on heap. Since we have the key in our keyset (from
* line#52) so we will be able to access it. In case we haven't it would have
* caused a DSI or machine crash.
*/
92 IBM AIX Continuous Availability Features