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authorNicholas Piggin <npiggin@gmail.com>2018-06-12 19:38:08 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2018-06-20 09:13:25 +1000
commit758380b8155f69b4e2f77f27562f8a7a466749d6 (patch)
tree0af02cb69c005b84975989068e21693134f50b1b /arch
parente08ecba17b72aeb01859601bc242a5bc48620109 (diff)
powerpc/64s/radix: Fix radix_kvm_prefetch_workaround paca access of not possible CPU
If possible CPUs are limited (e.g., by kexec), then the kvm prefetch workaround function can access the paca pointer for a !possible CPU. Fixes: d2e60075a3d44 ("powerpc/64: Use array of paca pointers and allocate pacas individually") Cc: stable@kernel.org Reported-by: Pridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com> Tested-by: Pridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/tlb-radix.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/mm/tlb-radix.c b/arch/powerpc/mm/tlb-radix.c
index a734e486664d..1135b43a597c 100644
--- a/arch/powerpc/mm/tlb-radix.c
+++ b/arch/powerpc/mm/tlb-radix.c
@@ -1097,6 +1097,8 @@ extern void radix_kvm_prefetch_workaround(struct mm_struct *mm)
for (; sib <= cpu_last_thread_sibling(cpu) && !flush; sib++) {
if (sib == cpu)
continue;
+ if (!cpu_possible(sib))
+ continue;
if (paca_ptrs[sib]->kvm_hstate.kvm_vcpu)
flush = true;
}