Re: [Qemu-devel] [PATCH 4/4] hw/arm/virt: Use new cpu_generic_new()

[Igor Mammedov]

On Mon, 13 Feb 2017 14:28:19 +0000
Peter Maydell <address@hidden> wrote:

> Use the new cpu_generic_new() rather than calling
> parse_features by hand.
> 
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  hw/arm/virt.c | 24 ++----------------------
>  1 file changed, 2 insertions(+), 22 deletions(-)
> 
> diff --git a/hw/arm/virt.c b/hw/arm/virt.c
> index f3440f2..bcb9a6d 100644
> --- a/hw/arm/virt.c
> +++ b/hw/arm/virt.c
> @@ -172,7 +172,6 @@ static const char *valid_cpus[] = {
>  static bool cpuname_valid(const char *cpu)
>  {
>      int i;
> -
>      for (i = 0; i < ARRAY_SIZE(valid_cpus); i++) {
>          if (strcmp(cpu, valid_cpus[i]) == 0) {
>              return true;
> @@ -1206,10 +1205,6 @@ static void machvirt_init(MachineState *machine)
>      MemoryRegion *ram = g_new(MemoryRegion, 1);
>      const char *cpu_model = machine->cpu_model;
>      char **cpustr;
> -    ObjectClass *oc;
> -    const char *typename;
> -    CPUClass *cc;
> -    Error *err = NULL;
>      bool firmware_loaded = bios_name || drive_get(IF_PFLASH, 0, 0);
>      uint8_t clustersz;
>  
> @@ -1240,6 +1235,7 @@ static void machvirt_init(MachineState *machine)
>          error_report("mach-virt: CPU %s not supported", cpustr[0]);
>          exit(1);
>      }
> +    g_strfreev(cpustr);
>  
>      /* If we have an EL3 boot ROM then the assumption is that it will
>       * implement PSCI itself, so disable QEMU's internal implementation
> @@ -1309,24 +1305,8 @@ static void machvirt_init(MachineState *machine)
>  
>      create_fdt(vms);
>  
> -    oc = cpu_class_by_name(TYPE_ARM_CPU, cpustr[0]);
> -    if (!oc) {
> -        error_report("Unable to find CPU definition");
> -        exit(1);
> -    }
> -    typename = object_class_get_name(oc);
> -
> -    /* convert -smp CPU options specified by the user into global props */
> -    cc = CPU_CLASS(oc);
> -    cc->parse_features(typename, cpustr[1], &err);
> -    g_strfreev(cpustr);
> -    if (err) {
> -        error_report_err(err);
> -        exit(1);
> -    }
> -
>      for (n = 0; n < smp_cpus; n++) {
> -        Object *cpuobj = object_new(typename);
> +        Object *cpuobj = OBJECT(cpu_generic_new(TYPE_ARM_CPU, cpu_model));
It unnecessarily pushes cpu_model parsing farther down the call stack
when all we need for CPU creation is type name.

Since I'm looking at adding '-device cpu' support to virt-arm,
I would prefer to leave object_new() here so that creation logic
would be similar to device_add and not mix '-cpu' parsing to typename
+ global properties that could be moved to generic machine code
with actual CPU creation.


>          if (!vmc->disallow_affinity_adjustment) {
>              /* Adjust MPIDR like 64-bit KVM hosts, which incorporate the
>               * GIC's target-list limitations. 32-bit KVM hosts currently