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Commit 758380b8 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
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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: d2e60075 ("powerpc/64: Use array of paca pointers and allocate pacas individually")
Cc: stable@kernel.org
Reported-by: default avatarPridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com>
Tested-by: default avatarPridhiviraj Paidipeddi <ppaidipe@linux.vnet.ibm.com>
Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent e08ecba1

arch/powerpc/mm/tlb-radix.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

		}