Re: [PATCH v4 04/10] powerpc/watchpoint: Enable watchpoint functionality on power10 guest

[Jordan Niethe]

On Fri, Jul 17, 2020 at 2:10 PM Ravi Bangoria
<ravi.bangoria@xxxxxxxxxxxxx> wrote:
>
> CPU_FTR_DAWR is by default enabled for host via CPU_FTRS_DT_CPU_BASE
> (controlled by CONFIG_PPC_DT_CPU_FTRS). But cpu-features device-tree
> node is not PAPR compatible and thus not yet used by kvm or pHyp
> guests. Enable watchpoint functionality on power10 guest (both kvm
> and powervm) by adding CPU_FTR_DAWR to CPU_FTRS_POWER10. Note that
> this change does not enable 2nd DAWR support.
>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxx>
I ran the ptrace-hwbreak selftest successfully within a power10 kvm guest.
Tested-by: Jordan Niethe <jniethe5@xxxxxxxxx>
> ---
>  arch/powerpc/include/asm/cputable.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
> index bac2252c839e..e506d429b1af 100644
> --- a/arch/powerpc/include/asm/cputable.h
> +++ b/arch/powerpc/include/asm/cputable.h
> @@ -478,7 +478,7 @@ static inline void cpu_feature_keys_init(void) { }
>             CPU_FTR_CFAR | CPU_FTR_HVMODE | CPU_FTR_VMX_COPY | \
>             CPU_FTR_DBELL | CPU_FTR_HAS_PPR | CPU_FTR_ARCH_207S | \
>             CPU_FTR_TM_COMP | CPU_FTR_ARCH_300 | CPU_FTR_PKEY | \
> -           CPU_FTR_ARCH_31)
> +           CPU_FTR_ARCH_31 | CPU_FTR_DAWR)
>  #define CPU_FTRS_CELL  (CPU_FTR_LWSYNC | \
>             CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
>             CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \
> --
> 2.26.2
>