[PATCH v3] target/arm: Use correct variable for setting 'max' cpu's MIDR_EL1

[Philippe Mathieu-Daudé]

MIDR_EL1 a 64-bit system register with the top 32-bit being RES0.

This fixes when compiling with -Werror=conversion:

  target/arm/cpu64.c: In function ‘aarch64_max_initfn’:
  target/arm/cpu64.c:628:21: error: conversion from ‘uint64_t’ {aka ‘long 
unsigned int’} to ‘uint32_t’ {aka ‘unsigned int’} may change value 
[-Werror=conversion]
    628 |         cpu->midr = t;
        |                     ^

Suggested-by: Laurent Desnogues <address@hidden>
Suggested-by: Peter Maydell <address@hidden>
Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
---
Since v2: Do not use RESERVED bits.
Since v1: Follow Laurent and Peter suggestion.
---
 target/arm/cpu.h | 2 +-
 target/arm/cpu.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index 8b9f2961ba..592fb217d6 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -894,7 +894,7 @@ struct ARMCPU {
         uint64_t id_aa64dfr0;
         uint64_t id_aa64dfr1;
     } isar;
-    uint32_t midr;
+    uint64_t midr;
     uint32_t revidr;
     uint32_t reset_fpsid;
     uint32_t ctr;
diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index a79f233b17..7ff80894b6 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -2757,7 +2757,7 @@ static const ARMCPUInfo arm_cpus[] = {
 static Property arm_cpu_properties[] = {
     DEFINE_PROP_BOOL("start-powered-off", ARMCPU, start_powered_off, false),
     DEFINE_PROP_UINT32("psci-conduit", ARMCPU, psci_conduit, 0),
-    DEFINE_PROP_UINT32("midr", ARMCPU, midr, 0),
+    DEFINE_PROP_UINT64("midr", ARMCPU, midr, 0),
     DEFINE_PROP_UINT64("mp-affinity", ARMCPU,
                         mp_affinity, ARM64_AFFINITY_INVALID),
     DEFINE_PROP_INT32("node-id", ARMCPU, node_id, CPU_UNSET_NUMA_NODE_ID),
-- 
2.21.1