Re: [PATCH qemu v6 2/6] ppc/spapr: Move GPRs setup to one place

[Fabiano Rosas <farosas@linux.ibm.com>]

Alexey Kardashevskiy <aik@ozlabs.ru> writes:

> At the moment "pseries" starts in SLOF which only expects the FDT blob
> pointer in r3. As we are going to introduce a OpenFirmware support in
> QEMU, we will be booting OF clients directly and these expect a stack
> pointer in r1, the OF entry point in r5 and in addition to this, Linux
> looks at r3/r4 for the initramdisk location (although vmlinux can find
> this from the device tree but zImage from distro kernels cannot).
>
> This extends spapr_cpu_set_entry_state() to take more registers. This
> should cause no behavioral change.
>
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>

Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>

> ---
>  include/hw/ppc/spapr_cpu_core.h | 4 +++-
>  hw/ppc/spapr.c                  | 4 ++--
>  hw/ppc/spapr_cpu_core.c         | 7 ++++++-
>  hw/ppc/spapr_rtas.c             | 2 +-
>  4 files changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/include/hw/ppc/spapr_cpu_core.h b/include/hw/ppc/spapr_cpu_core.h
> index 1c4cc6559c52..edd7214fafcf 100644
> --- a/include/hw/ppc/spapr_cpu_core.h
> +++ b/include/hw/ppc/spapr_cpu_core.h
> @@ -40,7 +40,9 @@ typedef struct SpaprCpuCoreClass {
>  } SpaprCpuCoreClass;
>  
>  const char *spapr_get_cpu_core_type(const char *cpu_type);
> -void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, target_ulong r3);
> +void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip,
> +                               target_ulong r1, target_ulong r3,
> +                               target_ulong r4, target_ulong r5);
>  
>  typedef struct SpaprCpuState {
>      uint64_t vpa_addr;
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index c9b2e0a5e060..660a4b60e072 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1674,8 +1674,8 @@ static void spapr_machine_reset(MachineState *machine)
>      spapr->fdt_blob = fdt;
>  
>      /* Set up the entry state */
> -    spapr_cpu_set_entry_state(first_ppc_cpu, SPAPR_ENTRY_POINT, fdt_addr);
> -    first_ppc_cpu->env.gpr[5] = 0;
> +    spapr_cpu_set_entry_state(first_ppc_cpu, SPAPR_ENTRY_POINT,
> +                              0, fdt_addr, 0, 0);
>  
>      spapr->cas_reboot = false;
>  
> diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
> index d09125d9afd4..696b76598dd7 100644
> --- a/hw/ppc/spapr_cpu_core.c
> +++ b/hw/ppc/spapr_cpu_core.c
> @@ -84,13 +84,18 @@ static void spapr_reset_vcpu(PowerPCCPU *cpu)
>      spapr_irq_cpu_intc_reset(spapr, cpu);
>  }
>  
> -void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip, target_ulong r3)
> +void spapr_cpu_set_entry_state(PowerPCCPU *cpu, target_ulong nip,
> +                               target_ulong r1, target_ulong r3,
> +                               target_ulong r4, target_ulong r5)
>  {
>      PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
>      CPUPPCState *env = &cpu->env;
>  
>      env->nip = nip;
> +    env->gpr[1] = r1;
>      env->gpr[3] = r3;
> +    env->gpr[4] = r4;
> +    env->gpr[5] = r5;
>      kvmppc_set_reg_ppc_online(cpu, 1);
>      CPU(cpu)->halted = 0;
>      /* Enable Power-saving mode Exit Cause exceptions */
> diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c
> index 656fdd221665..9e3cbd70bbd9 100644
> --- a/hw/ppc/spapr_rtas.c
> +++ b/hw/ppc/spapr_rtas.c
> @@ -190,7 +190,7 @@ static void rtas_start_cpu(PowerPCCPU *callcpu, SpaprMachineState *spapr,
>       */
>      newcpu->env.tb_env->tb_offset = callcpu->env.tb_env->tb_offset;
>  
> -    spapr_cpu_set_entry_state(newcpu, start, r3);
> +    spapr_cpu_set_entry_state(newcpu, start, 0, r3, 0, 0);
>  
>      qemu_cpu_kick(CPU(newcpu));