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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: d2e60075a3 ("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>
This commit is contained in:
Nicholas Piggin 2018-06-12 19:38:08 +10:00 committed by Michael Ellerman
parent e08ecba17b
commit 758380b815
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/mm/tlb-radix.c
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@ -1097,6 +1097,8 @@ extern void radix_kvm_prefetch_workaround(struct mm_struct *mm)
for (; sib <= cpu_last_thread_sibling(cpu) && !flush; sib++) { for (; sib <= cpu_last_thread_sibling(cpu) && !flush; sib++) {
if (sib == cpu) if (sib == cpu)
continue; continue;
if (!cpu_possible(sib))
continue;
if (paca_ptrs[sib]->kvm_hstate.kvm_vcpu) if (paca_ptrs[sib]->kvm_hstate.kvm_vcpu)
flush = true; flush = true;
} }