Commit 7cd2a869 authored Aug 03, 2017 by Suraj Jitindar Singh Committed by Michael Ellerman Aug 10, 2017

powerpc/mm: Properly invalidate when setting process table base



The host process table base is stored in the partition table by calling
the function native_register_process_table(). Currently this just sets
the entry in memory and is missing a subsequent cache invalidation
instruction. Any update to the partition table should be followed by a
cache invalidation instruction specifying invalidation of the caching of
any partition table entries (RIC = 2, PRS = 0).

We already have a function to update the partition table with the
required cache invalidation instructions - mmu_partition_table_set_entry().
Update the native_register_process_table() function to call
mmu_partition_table_set_entry(), this ensures all appropriate
invalidation will be performed.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[mpe: Use a local for patb0 to clean it up slightly]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

parent cffb717c

arch/powerpc/mm/pgtable-radix.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -28,9 +28,13 @@
		static int native_register_process_table(unsigned long base, unsigned long pg_sz,
		unsigned long table_size)
		{
		unsigned long patb1 = base \| table_size \| PATB_GR;
		unsigned long patb0, patb1;

		patb0 = be64_to_cpu(partition_tb[0].patb0);
		patb1 = base \| table_size \| PATB_GR;

		mmu_partition_table_set_entry(0, patb0, patb1);

		partition_tb->patb1 = cpu_to_be64(patb1);
		return 0;
		}