powerpc/mm: Flush radix process translations when setting MMU type

commit 62e984ddfd6b056d399e24113f5e6a7145e579d8 upstream.

Radix guests do normally invalidate process-scoped translations when a
new pid is allocated but migrated guests do not invalidate these so
migrated guests crash sometime, especially easy to reproduce with
migration happening within first 10 seconds after the guest boot start
on the same machine.

This adds the "Invalidate process-scoped translations" flush to fix
radix guests migration.

Fixes: 2ee13be34b13 ("KVM: PPC: Book3S HV: Update kvmppc_set_arch_compat() for ISA v3.00")
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Tested-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index ac0717a90ca6bd7be1a9071666e61c4e78782ceb..12f95b1f7d078aff818f4e48b9c3e46ac6fad49f 100644 (file)
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -483,6 +483,8 @@ void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0,
        if (old & PATB_HR) {
                asm volatile(PPC_TLBIE_5(%0,%1,2,0,1) : :
                             "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
+               asm volatile(PPC_TLBIE_5(%0,%1,2,1,1) : :
+                            "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
                trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 1);
        } else {
                asm volatile(PPC_TLBIE_5(%0,%1,2,0,0) : :