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target-ppc: Update slb array with correct index values.

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Without this, a value of rb=0 and rs=0 results in replacing the 0th
index. This can be observed when using gdb remote debugging support.

(gdb) x/10i do_fork
   0xc000000000085330 <do_fork>:        Cannot access memory at address 0xc000000000085330
(gdb)

This is because when we do the slb sync via kvm_cpu_synchronize_state,
we overwrite the slb entry (0th entry) for 0xc000000000085330

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Aneesh Kumar K.V 2013-10-01 21:49:28 +05:30 committed by Alexander Graf
parent 5cc7a967e9
commit 4b4d4a21b9
1 changed files with 15 additions and 2 deletions
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17
target-ppc/kvm.c
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@ -1033,9 +1033,22 @@ int kvm_arch_get_registers(CPUState *cs)
/* Sync SLB */
#ifdef TARGET_PPC64
/*
* The packed SLB array we get from KVM_GET_SREGS only contains
* information about valid entries. So we flush our internal
* copy to get rid of stale ones, then put all valid SLB entries
* back in.
*/
memset(env->slb, 0, sizeof(env->slb));
for (i = 0; i < 64; i++) {
ppc_store_slb(env, sregs.u.s.ppc64.slb[i].slbe,
sregs.u.s.ppc64.slb[i].slbv);
target_ulong rb = sregs.u.s.ppc64.slb[i].slbe;
target_ulong rs = sregs.u.s.ppc64.slb[i].slbv;
/*
* Only restore valid entries
*/
if (rb & SLB_ESID_V) {
ppc_store_slb(env, rb, rs);
}
}
#endif