Subject: [PATCH 2/9] powerpc/pseries: radix is not subject to RMA limit, remove it

From: Nicholas Piggin <[email-masked]>
Date: Fri, 22 Dec 2017 21:17:09 +1000

The radix guest is not subject to the paravirtualized HPT VRMA limit,
so remove that from ppc64_rma_size calculation for that platform.

Signed-off-by: Nicholas Piggin <[email-masked]>
---
 arch/powerpc/mm/pgtable-radix.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index d73816960825..6606216f1992 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -625,15 +625,12 @@ void radix__setup_initial_memory_limit(phys_addr_t first_memblock_base,
 
 	if (!early_cpu_has_feature(CPU_FTR_HVMODE)) {
 		/*
-		 * We limit the allocation that depend on ppc64_rma_size
-		 * to first_memblock_size. We also clamp it to 1GB to
-		 * avoid some funky things such as RTAS bugs.
+		 * Radix mode guests are not limited by RMA / VRMA addressing.
 		 *
-		 * On radix config we really don't have a limitation
-		 * on real mode access. But keeping it as above works
-		 * well enough.
+		 * We do clamp addresses to 1GB to avoid some funky things
+		 * such as RTAS bugs.
 		 */
-		ppc64_rma_size = min_t(u64, first_memblock_size, 0x40000000);
+		ppc64_rma_size = 0x40000000;
 		/*
 		 * Finally limit subsequent allocations. We really don't want
 		 * to limit the memblock allocations to rma_size. FIXME!! should
-- 
2.15.0