Patch "powerpc/64: Invalidate process table caching after setting process table" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

powerpc/64: Invalidate process table caching after setting process table

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
powerpc-64-invalidate-process-table-caching-after-setting-process-table.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Paul Mackerras <[email protected]>
Date: Mon, 27 Feb 2017 14:32:41 +1100
Subject: powerpc/64: Invalidate process table caching after setting process table

From: Paul Mackerras <[email protected]>

[ Upstream commit 7a70d7288c926ae88e0c773fbb506aa374e99c2d ]

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.

---
 arch/powerpc/mm/pgtable-radix.c |    4 ++++
 1 file changed, 4 insertions(+)

@@ -173,6 +173,10 @@ redo:
 	 */
 	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)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/powerpc-64-fix-checksum-folding-in-csum_add.patch queue-4.9/powerpc-64-invalidate-process-table-caching-after-setting-process-table.patch