IBM AIX Continuous Availability Features - IBM Redbooks

myprog: myprog.c
$(CC) -q64 -o myprog myprog.c $(LIB)
clean:
rm -f *.o myprog service kkey_set64
The kernel extension will create a private heap protected by key KKEY_VMM. Then kernel
extension will try to access it with and without KKEY_VMM in its keyset.
When trying access without KKEY_VMM, it should cause a DSI with exception
EXCEPT_SKEY; see Example 3-22.
Example 3-22 Kernel extension code, system call is kkey_test(): kkey_set.c
#include
#include
#include
#include
#include
#include
#include
kkey_test_init(int cmd, struct uio * uio)
{
printf("Kernel Extension kkey_set loaded successfully\n");
return 0;
}
int kkey_test(int mode)
{
kerrno_t rc;
kkey_t kkey=KKEY_VMM;
heapattr_t heapattr;
heapaddr_t my_heap=HPA_INVALID_HEAP;
kkeyset_t myset=KKEYSET_INVALID;
hkeyset_t hwset, hwset1, oldhwset, oldhwset1;
printf("\n");
if ((rc=kkeyset_create( &myset))!=0){
printf("kkeyset_create() failed\n");
return -1;
}
hwset1=hkeyset_get();
printf("Current hardware keyset =%016lx\n",hwset1);
/*
* Add keyset KKEYSET_KERNEXT to our keyset.
* Remember KKEYSET_KERNEXT= {KKEY_PUBLIC, KKEY_BLOCK_DEV, KKEY_COMMO,
* KKEY_USB, KKEY_GRPAPHICS, KKEY_FILESYSTEM, KKEY_DMA, KKEY_TRB, KKEY_MBUF,
* KKEY_IOMAP}
*/
if ((rc=kkeyset_add_set(myset, KKEYSET_KERNEXT))!=0){
printf("kkseyset_add_set() failed\n");
return -1;
}
if ((rc=kkeyset_to_hkeyset(myset, &hwset))!=0){
printf("kkeyset_to_hkeyset() failed: rc=%lx\n",rc);
return -1;
Chapter 3. AIX advanced continuous availability tools and features 91