diff mbox series

[4/9] powerpc/pseries: lift RTAS limit for radix

Message ID 20171222111716.13101-5-npiggin@gmail.com (mailing list archive)
State Accepted
Commit 5eae82cab5d7e13292d53205c0cc145c110c92be
Headers show
Series modernize early memory allocation limits and | expand

Commit Message

Nicholas Piggin Dec. 22, 2017, 11:17 a.m. UTC 
With the previous patch to switch to 64-bit mode after returning from
RTAS and before doing any memory accesses, the RMA limit need not be
clamped to 1GB to avoid RTAS bugs.

Keep the 1GB limit for older firmware (although this is more of a kernel
concern than RTAS), and remove it starting with POWER9.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/mm/pgtable-radix.c | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)
diff mbox series

Patch

diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 6606216f1992..b8c49e6623ae 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -623,23 +623,10 @@  void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
 	 */
 	BUG_ON(first_memblock_base != 0);
 
-	if (!early_cpu_has_feature(CPU_FTR_HVMODE)) {
-		/*
-		 * Radix mode guests are not limited by RMA / VRMA addressing.
-		 *
-		 * We do clamp addresses to 1GB to avoid some funky things
-		 * such as RTAS bugs.
-		 */
-		ppc64_rma_size = 0x40000000;
-		/*
-		 * Finally limit subsequent allocations. We really don't want
-		 * to limit the memblock allocations to rma_size. FIXME!! should
-		 * we even limit at all ?
-		 */
-		memblock_set_current_limit(first_memblock_base + first_memblock_size);
-	} else {
-		ppc64_rma_size = ULONG_MAX;
-	}
+	/*
+	 * Radix mode is not limited by RMA / VRMA addressing.
+	 */
+	ppc64_rma_size = ULONG_MAX;
 }
 
 #ifdef CONFIG_MEMORY_HOTPLUG