Re: [Qemu-devel] [PATCH RFC 2/4] target-ppc: with MTTCG report more threads

[Greg Kurz <groug@kaod.org>]

On Fri,  2 Sep 2016 12:02:54 +0530
Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> wrote:

> Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
> ---

Shouldn't this patch be the last one, when all other issues have been addressed ?

>  target-ppc/kvm.c     | 2 +-
>  target-ppc/kvm_ppc.h | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
> index dcb68b9..20eb450 100644
> --- a/target-ppc/kvm.c
> +++ b/target-ppc/kvm.c
> @@ -2090,7 +2090,7 @@ void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy)
>  
>  int kvmppc_smt_threads(void)
>  {
> -    return cap_ppc_smt ? cap_ppc_smt : 1;
> +    return cap_ppc_smt ? cap_ppc_smt : 8;

If KVM is there but does not support SMT processor modes, it looks
wrong to return anything but 1. This check needs kvm_enabled().

Also, why 8 ? This depends on the CPU model. Also, since real HW allows to
choose the SMT mode, maybe this should be configurable from the command
line as well.

>  }
>  
>  #ifdef TARGET_PPC64
> diff --git a/target-ppc/kvm_ppc.h b/target-ppc/kvm_ppc.h
> index 5461d10..053db0a 100644
> --- a/target-ppc/kvm_ppc.h
> +++ b/target-ppc/kvm_ppc.h
> @@ -128,7 +128,7 @@ static inline void kvmppc_set_mpic_proxy(PowerPCCPU *cpu, int mpic_proxy)
>  
>  static inline int kvmppc_smt_threads(void)
>  {
> -    return 1;
> +    return 8;

Same remark.

>  }
>  
>  static inline int kvmppc_or_tsr_bits(PowerPCCPU *cpu, uint32_t tsr_bits)

Cheers.

--
Greg