Re: [Qemu-devel] [Qemu-ppc] [PATCH 11/77] ppc: Create cpu_ppc_set_papr() helper

[David Gibson]

On Wed, Nov 11, 2015 at 11:27:24AM +1100, Benjamin Herrenschmidt wrote:
> And move the code adjusting the MSR mask and calling kvmppc_set_papr()
> to it. This allows us to add a few more things such as disabling setting
> of MSR:HV and appropriate LPCR bits which will be used when fixing
> the exception model.
> 
> Signed-off-by: Benjamin Herrenschmidt <address@hidden>

Reviewed-by: David Gibson <address@hidden>

> ---
>  hw/ppc/spapr.c              | 12 +++---------
>  target-ppc/cpu.h            |  1 +
>  target-ppc/translate_init.c | 37 ++++++++++++++++++++++++++++++++++++-
>  3 files changed, 40 insertions(+), 10 deletions(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 37d071e..610629e 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1606,15 +1606,8 @@ static void spapr_cpu_init(sPAPRMachineState *spapr, 
> PowerPCCPU *cpu)
>      /* Set time-base frequency to 512 MHz */
>      cpu_ppc_tb_init(env, TIMEBASE_FREQ);
>  
> -    /* PAPR always has exception vectors in RAM not ROM. To ensure this,
> -     * MSR[IP] should never be set.
> -     */
> -    env->msr_mask &= ~(1 << 6);
> -
> -    /* Tell KVM that we're in PAPR mode */
> -    if (kvm_enabled()) {
> -        kvmppc_set_papr(cpu);
> -    }
> +    /* Enable PAPR mode in TCG or KVM */
> +    cpu_ppc_set_papr(cpu);
>  
>      if (cpu->max_compat) {
>          if (ppc_set_compat(cpu, cpu->max_compat) < 0) {
> @@ -1791,6 +1784,7 @@ static void ppc_spapr_init(MachineState *machine)
>              fprintf(stderr, "Unable to find PowerPC CPU definition\n");
>              exit(1);
>          }
> +
>          spapr_cpu_init(spapr, cpu);
>      }
>  
> diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
> index 611367f..357b6e7 100644
> --- a/target-ppc/cpu.h
> +++ b/target-ppc/cpu.h
> @@ -1229,6 +1229,7 @@ void store_booke_tcr (CPUPPCState *env, target_ulong 
> val);
>  void store_booke_tsr (CPUPPCState *env, target_ulong val);
>  void ppc_tlb_invalidate_all (CPUPPCState *env);
>  void ppc_tlb_invalidate_one (CPUPPCState *env, target_ulong addr);
> +void cpu_ppc_set_papr(PowerPCCPU *cpu);
>  #endif
>  #endif
>  
> diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
> index 1d402e1..7bcfbc0 100644
> --- a/target-ppc/translate_init.c
> +++ b/target-ppc/translate_init.c
> @@ -8423,8 +8423,43 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data)
>      pcc->interrupts_big_endian = ppc_cpu_interrupts_big_endian_lpcr;
>      pcc->threads_per_core = 8;
>  }
> -#endif /* defined (TARGET_PPC64) */
>  
> +#if !defined(CONFIG_USER_ONLY)
> +
> +void cpu_ppc_set_papr(PowerPCCPU *cpu)
> +{
> +    CPUPPCState *env = &cpu->env;
> +    ppc_spr_t *lpcr = &env->spr_cb[SPR_LPCR];
> +
> +    /* PAPR always has exception vectors in RAM not ROM. To ensure this,
> +     * MSR[IP] should never be set.
> +     *
> +     * We also disallow setting of MSR_HV
> +     */
> +    env->msr_mask &= ~((1ull << MSR_EP) | MSR_HVB);
> +
> +    /* Set emulated LPCR to not send interrupts to hypervisor. Note that
> +     * under KVM, the actual HW LPCR will be set differently by KVM itself,
> +     * the settings below ensure proper operations with TCG in absence of
> +     * a real hypervisor
> +     */
> +    lpcr->default_value &= ~(LPCR_VPM0 | LPCR_VPM1 | LPCR_ISL | LPCR_KBV);
> +    lpcr->default_value |= LPCR_LPES0 | LPCR_LPES1;
> +
> +    /* We should be followed by a CPU reset but update the active value
> +     * just in case...
> +     */
> +    env->spr[SPR_LPCR] = lpcr->default_value;
> +
> +    /* Tell KVM that we're in PAPR mode */
> +    if (kvm_enabled()) {
> +        kvmppc_set_papr(cpu);
> +    }
> +}
> +
> +#endif /* !defined(CONFIG_USER_ONLY) */
> +
> +#endif /* defined (TARGET_PPC64) */
>  
>  
> /*****************************************************************************/
>  /* Generic CPU instantiation routine                                         
> */

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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