From ae9b87b57aa0cfc52f49960888c5d7d8060fa28c Mon Sep 17 00:00:00 2001
From: David Gibson <dgibson@redhat.com>
Date: Fri, 11 Aug 2017 06:09:08 +0200
Subject: [PATCH 1/3] target/ppc: Implement TIDR
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RH-Author: David Gibson <dgibson@redhat.com>
Message-id: <20170811060909.31369-2-dgibson@redhat.com>
Patchwork-id: 75935
O-Subject: [RHEL-7.4-ALT qemu-kvm PATCH 1/2] target/ppc: Implement TIDR
Bugzilla: 1478822
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

From: David Gibson <david@gibson.dropbear.id.au>

This adds a trivial implementation of the TIDR register added in
POWER9.  This isn't particularly important to qemu directly - it's
used by accelerator modules that we don't emulate.

However, since qemu isn't aware of it, its state is not synchronized
with KVM and therefore not migrated, which can be a problem.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
(cherry picked from commit 650f3287abb7c6124b7fb0f4a2330246fe2d4da2)

Signed-off-by: David Gibson <dgibson@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 target/ppc/cpu.h            | 1 +
 target/ppc/translate_init.c | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 43bd257..a2d7b6f 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1444,6 +1444,7 @@ int ppc_compat_max_threads(PowerPCCPU *cpu);
 #define SPR_TEXASR            (0x082)
 #define SPR_TEXASRU           (0x083)
 #define SPR_UCTRL             (0x088)
+#define SPR_TIDR              (0x090)
 #define SPR_MPC_CMPA          (0x090)
 #define SPR_MPC_CMPB          (0x091)
 #define SPR_MPC_CMPC          (0x092)
diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
index c1a9014..624bc1c 100644
--- a/target/ppc/translate_init.c
+++ b/target/ppc/translate_init.c
@@ -8837,6 +8837,11 @@ static void init_proc_POWER9(CPUPPCState *env)
     gen_spr_power8_book4(env);
     gen_spr_power8_rpr(env);
 
+    /* POWER9 Specific registers */
+    spr_register_kvm(env, SPR_TIDR, "TIDR", NULL, NULL,
+                     spr_read_generic, spr_write_generic,
+                     KVM_REG_PPC_TIDR, 0);
+
     /* env variables */
 #if !defined(CONFIG_USER_ONLY)
     env->slb_nr = 32;
-- 
1.8.3.1