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Re: [PATCH] target/ppc: Use SMT4 small core chip type in POWER9/10 PVRs

From: Harsh Prateek Bora
Subject: Re: [PATCH] target/ppc: Use SMT4 small core chip type in POWER9/10 PVRs
Date: Tue, 16 May 2023 14:13:45 +0530
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.10.0

<correcting my email id in CC>

On 5/15/23 21:31, Nicholas Piggin wrote:
QEMU's PVR value for POWER9 DD2.0 has chip type 1, which is the SMT4
"small core" type that OpenPOWER processors use. QEMU's PVR for all
other POWER9/10 have chip type 0, which "enterprise" systems use.

The difference does not really matter to QEMU (because it does not care
about SMT mode in the target), but for consistency all PVRs should use
the same chip type. We'll go with the SMT4 OpenPOWER type.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This is a replacement for


But the chip type is changed to 1 instead of 0, because that's the
more familiar SM4 / small core CPU.


  target/ppc/cpu-models.h | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/target/ppc/cpu-models.h b/target/ppc/cpu-models.h
index 1326493a9a..a77e036b3a 100644
--- a/target/ppc/cpu-models.h
+++ b/target/ppc/cpu-models.h
@@ -348,11 +348,11 @@ enum {
      CPU_POWERPC_POWER8NVL_BASE     = 0x004C0000,
      CPU_POWERPC_POWER8NVL_v10      = 0x004C0100,
      CPU_POWERPC_POWER9_BASE        = 0x004E0000,
-    CPU_POWERPC_POWER9_DD1         = 0x004E0100,
+    CPU_POWERPC_POWER9_DD1         = 0x004E1100,

Could you please point me to the doc location you are referring here?
The P9 UM document that I have access to mentions this bit (0/1) for 12/24 cores. Not sure if this change is intended here.


      CPU_POWERPC_POWER9_DD20        = 0x004E1200,
      CPU_POWERPC_POWER10_BASE       = 0x00800000,
-    CPU_POWERPC_POWER10_DD1        = 0x00800100,
-    CPU_POWERPC_POWER10_DD20       = 0x00800200,
+    CPU_POWERPC_POWER10_DD1        = 0x00801100,
+    CPU_POWERPC_POWER10_DD20       = 0x00801200,
      CPU_POWERPC_970_v22            = 0x00390202,
      CPU_POWERPC_970FX_v10          = 0x00391100,
      CPU_POWERPC_970FX_v20          = 0x003C0200,

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