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| author | Paul Mackerras <paulus@ozlabs.org> | 2017-02-27 04:32:41 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-03 01:24:50 +0100 |
| commit | 7a70d7288c926ae88e0c773fbb506aa374e99c2d (patch) | |
| tree | 7aa6e7b2a53410641818236d49ede506fc8ce850 | |
| parent | powerpc: emulate_step() tests for load/store instructions (diff) | |
| download | linux-7a70d7288c926ae88e0c773fbb506aa374e99c2d.tar.xz linux-7a70d7288c926ae88e0c773fbb506aa374e99c2d.zip | |
powerpc/64: Invalidate process table caching after setting process table
The POWER9 MMU reads and caches entries from the process table.
When we kexec from one kernel to another, the second kernel sets
its process table pointer but doesn't currently do anything to
make the CPU invalidate any cached entries from the old process table.
This adds a tlbie (TLB invalidate entry) instruction with parameters
to invalidate caching of the process table after the new process
table is installed.
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/mm/pgtable-radix.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index feeda90cd06d..01c94f141164 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -186,6 +186,10 @@ static void __init radix_init_pgtable(void) */ register_process_table(__pa(process_tb), 0, PRTB_SIZE_SHIFT - 12); pr_info("Process table %p and radix root for kernel: %p\n", process_tb, init_mm.pgd); + asm volatile("ptesync" : : : "memory"); + asm volatile(PPC_TLBIE_5(%0,%1,2,1,1) : : + "r" (TLBIEL_INVAL_SET_LPID), "r" (0)); + asm volatile("eieio; tlbsync; ptesync" : : : "memory"); } static void __init radix_init_partition_table(void) |