[RFC,kernel] powerpc/mm: Flush "process-scoped translations" when setting MMU type

Message ID 20180109013541.6229-1-aik@ozlabs.ru
State New
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  • [RFC,kernel] powerpc/mm: Flush "process-scoped translations" when setting MMU type
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Commit Message

Alexey Kardashevskiy Jan. 9, 2018, 1:35 a.m.
This fixes migration on POWER9 machines, especially when migration
starts within first 10 seconds after the guest start.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---

This is a reminder that the problem exists, a proper patch and
commit log are still needed. The "(old & PATB_HR)" was tested but
not the other one, something is wrong with hpt guest on radix host.
---
 arch/powerpc/mm/pgtable_64.c | 4 ++++
 1 file changed, 4 insertions(+)

Patch

diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 813ea22..f690f6d 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -483,10 +483,14 @@  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) : :
 			     "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
+		asm volatile(PPC_TLBIE_5(%0,%1,2,1,0) : :
+				"r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
 		trace_tlbie(lpid, 0, TLBIEL_INVAL_SET_LPID, lpid, 2, 0, 0);
 	}
 	asm volatile("eieio; tlbsync; ptesync" : : : "memory");