Re: [Qemu-devel] [PATCH v4] spapr: quantify error messages regarding capability settings

[David Gibson <david@gibson.dropbear.id.au>]

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On Mon, Aug 12, 2019 at 05:10:44PM +1000, Daniel Black wrote:
> Its not immediately obvious how cap-X=Y setting need to be applied
> to the command line so, for spapr capability error messages, this
> has been clarified to:
> 
>  appending -machine cap-X=Y
> 
> The wrong value messages have been left as is, as the user has found
> the right location.

Applied to ppc-for-4.2.

> 
> Reviewed-by: Greg Kurz <groug@kaod.org>
> Signed-off-by: Daniel Black <daniel@linux.ibm.com>
> ---
> v4 Message inline rather than macro. greppability nitpick accepted with
> grace and the magic of %s/CAPABILITY_HINT("\([^"]*\)")/" try appending -machine \1"/g.
> v3 Hint, and not all messages, (can't use error_append_hint on
> error_fatal) from Greg Kurz
> v2 Improved error message thanks David Gibson
> 
> Left the "appending" as its not obvious more that one -machine
> arguement is allowed.
> 
>  hw/ppc/spapr_caps.c | 42 ++++++++++++++++++++++++++++--------------
>  1 file changed, 28 insertions(+), 14 deletions(-)
> 
> diff --git a/hw/ppc/spapr_caps.c b/hw/ppc/spapr_caps.c
> index bbb001f84a..405286db6f 100644
> --- a/hw/ppc/spapr_caps.c
> +++ b/hw/ppc/spapr_caps.c
> @@ -194,10 +194,12 @@ static void cap_htm_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
>      }
>      if (tcg_enabled()) {
>          error_setg(errp,
> -                   "No Transactional Memory support in TCG, try cap-htm=off");
> +                   "No Transactional Memory support in TCG,"
> +                   " try appending -machine cap-htm=off");
>      } else if (kvm_enabled() && !kvmppc_has_cap_htm()) {
>          error_setg(errp,
> -"KVM implementation does not support Transactional Memory, try cap-htm=off"
> +"KVM implementation does not support Transactional Memory,"
> +                   " try appending -machine cap-htm=off"
>              );
>      }
>  }
> @@ -215,7 +217,8 @@ static void cap_vsx_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
>       * rid of anything that doesn't do VMX */
>      g_assert(env->insns_flags & PPC_ALTIVEC);
>      if (!(env->insns_flags2 & PPC2_VSX)) {
> -        error_setg(errp, "VSX support not available, try cap-vsx=off");
> +        error_setg(errp, "VSX support not available,"
> +                   " try appending -machine cap-vsx=off");
>      }
>  }
>  
> @@ -229,7 +232,8 @@ static void cap_dfp_apply(SpaprMachineState *spapr, uint8_t val, Error **errp)
>          return;
>      }
>      if (!(env->insns_flags2 & PPC2_DFP)) {
> -        error_setg(errp, "DFP support not available, try cap-dfp=off");
> +        error_setg(errp, "DFP support not available,"
> +                   " try appending -machine cap-dfp=off");
>      }
>  }
>  
> @@ -253,7 +257,8 @@ static void cap_safe_cache_apply(SpaprMachineState *spapr, uint8_t val,
>                     cap_cfpc_possible.vals[val]);
>      } else if (kvm_enabled() && (val > kvm_val)) {
>          error_setg(errp,
> -"Requested safe cache capability level not supported by kvm, try cap-cfpc=%s",
> +                   "Requested safe cache capability level not supported by kvm,"
> +                   " try appending -machine cap-cfpc=%s",
>                     cap_cfpc_possible.vals[kvm_val]);
>      }
>  
> @@ -281,7 +286,8 @@ static void cap_safe_bounds_check_apply(SpaprMachineState *spapr, uint8_t val,
>                     cap_sbbc_possible.vals[val]);
>      } else if (kvm_enabled() && (val > kvm_val)) {
>          error_setg(errp,
> -"Requested safe bounds check capability level not supported by kvm, try cap-sbbc=%s",
> +"Requested safe bounds check capability level not supported by kvm,"
> +                   " try appending -machine cap-sbbc=%s",
>                     cap_sbbc_possible.vals[kvm_val]);
>      }
>  
> @@ -312,7 +318,8 @@ static void cap_safe_indirect_branch_apply(SpaprMachineState *spapr,
>                     cap_ibs_possible.vals[val]);
>      } else if (kvm_enabled() && (val > kvm_val)) {
>          error_setg(errp,
> -"Requested safe indirect branch capability level not supported by kvm, try cap-ibs=%s",
> +"Requested safe indirect branch capability level not supported by kvm,"
> +                   " try appending -machine cap-ibs=%s",
>                     cap_ibs_possible.vals[kvm_val]);
>      }
>  
> @@ -401,11 +408,13 @@ static void cap_nested_kvm_hv_apply(SpaprMachineState *spapr,
>  
>      if (tcg_enabled()) {
>          error_setg(errp,
> -                   "No Nested KVM-HV support in tcg, try cap-nested-hv=off");
> +                   "No Nested KVM-HV support in tcg,"
> +                   " try appending -machine cap-nested-hv=off");
>      } else if (kvm_enabled()) {
>          if (!kvmppc_has_cap_nested_kvm_hv()) {
>              error_setg(errp,
> -"KVM implementation does not support Nested KVM-HV, try cap-nested-hv=off");
> +"KVM implementation does not support Nested KVM-HV,"
> +                       " try appending -machine cap-nested-hv=off");
>          } else if (kvmppc_set_cap_nested_kvm_hv(val) < 0) {
>                  error_setg(errp,
>  "Error enabling cap-nested-hv with KVM, try cap-nested-hv=off");
> @@ -435,10 +444,12 @@ static void cap_large_decr_apply(SpaprMachineState *spapr,
>  
>          if (!kvm_nr_bits) {
>              error_setg(errp,
> -                       "No large decrementer support, try cap-large-decr=off");
> +                       "No large decrementer support,"
> +                        " try appending -machine cap-large-decr=off");
>          } else if (pcc->lrg_decr_bits != kvm_nr_bits) {
>              error_setg(errp,
> -"KVM large decrementer size (%d) differs to model (%d), try -cap-large-decr=off",
> +"KVM large decrementer size (%d) differs to model (%d),"
> +                " try appending -machine cap-large-decr=off",
>                  kvm_nr_bits, pcc->lrg_decr_bits);
>          }
>      }
> @@ -454,7 +465,8 @@ static void cap_large_decr_cpu_apply(SpaprMachineState *spapr,
>      if (kvm_enabled()) {
>          if (kvmppc_enable_cap_large_decr(cpu, val)) {
>              error_setg(errp,
> -                       "No large decrementer support, try cap-large-decr=off");
> +                       "No large decrementer support,"
> +                       " try appending -machine cap-large-decr=off");
>          }
>      }
>  
> @@ -474,10 +486,12 @@ static void cap_ccf_assist_apply(SpaprMachineState *spapr, uint8_t val,
>      if (tcg_enabled() && val) {
>          /* TODO - for now only allow broken for TCG */
>          error_setg(errp,
> -"Requested count cache flush assist capability level not supported by tcg, try cap-ccf-assist=off");
> +"Requested count cache flush assist capability level not supported by tcg,"
> +                   " try appending -machine cap-ccf-assist=off");
>      } else if (kvm_enabled() && (val > kvm_val)) {
>          error_setg(errp,
> -"Requested count cache flush assist capability level not supported by kvm, try cap-ccf-assist=off");
> +"Requested count cache flush assist capability level not supported by kvm,"
> +                   " try appending -machine cap-ccf-assist=off");
>      }
>  }
>  

-- 
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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