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[PATCH v4 09/12] target/ppc: Correct RMLS table


From: David Gibson
Subject: [PATCH v4 09/12] target/ppc: Correct RMLS table
Date: Wed, 19 Feb 2020 13:14:06 +1100

The table of RMA limits based on the LPCR[RMLS] field is slightly wrong.
We're missing the RMLS == 0 => 256 GiB RMA option, which is available on
POWER8, so add that.

The comment that goes with the table is much more wrong.  We *don't* filter
invalid RMLS values when writing the LPCR, and there's not really a
sensible way to do so.  Furthermore, while in theory the set of RMLS values
is implementation dependent, it seems in practice the same set has been
available since around POWER4+ up until POWER8, the last model which
supports RMLS at all.  So, correct that as well.

Signed-off-by: David Gibson <address@hidden>
Reviewed-by: C├ędric Le Goater <address@hidden>
---
 target/ppc/mmu-hash64.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
index 4e6c1f722b..46690bc79b 100644
--- a/target/ppc/mmu-hash64.c
+++ b/target/ppc/mmu-hash64.c
@@ -762,12 +762,12 @@ static target_ulong rmls_limit(PowerPCCPU *cpu)
 {
     CPUPPCState *env = &cpu->env;
     /*
-     * This is the full 4 bits encoding of POWER8. Previous
-     * CPUs only support a subset of these but the filtering
-     * is done when writing LPCR
+     * In theory the meanings of RMLS values are implementation
+     * dependent.  In practice, this seems to have been the set from
+     * POWER4+..POWER8, and RMLS is no longer supported in POWER9.
      */
     const target_ulong rma_sizes[] = {
-        [0] = 0,
+        [0] = 256 * GiB,
         [1] = 16 * GiB,
         [2] = 1 * GiB,
         [3] = 64 * MiB,
-- 
2.24.1




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