Re: [Xen-devel] [PATCH 16/18] arm/altp2m: Extended libxl to activate altp2m on ARM.

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Jul 04, 2016 at 01:45:45PM +0200, Sergej Proskurin wrote:
> The current implementation allows to set the parameter HVM_PARAM_ALTP2M.
> This parameter allows further usage of altp2m on ARM. For this, we
> define an additional altp2m field for PV domains as part of the
> libxl_domain_type struct. This field can be set only on ARM systems
> through the "altp2m" switch in the domain's configuration file (i.e.
> set altp2m=1).
> 
> Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
> ---
> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
> ---
>  tools/libxl/libxl_create.c  |  1 +
>  tools/libxl/libxl_dom.c     | 14 ++++++++++++++
>  tools/libxl/libxl_types.idl |  1 +
>  tools/libxl/xl_cmdimpl.c    |  5 +++++
>  4 files changed, 21 insertions(+)
> 
> diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
> index 1b99472..40b5f61 100644
> --- a/tools/libxl/libxl_create.c
> +++ b/tools/libxl/libxl_create.c
> @@ -400,6 +400,7 @@ int libxl__domain_build_info_setdefault(libxl__gc *gc,
>              b_info->cmdline = b_info->u.pv.cmdline;
>              b_info->u.pv.cmdline = NULL;
>          }
> +        libxl_defbool_setdefault(&b_info->u.pv.altp2m, false);
>          break;
>      default:
>          LOG(ERROR, "invalid domain type %s in create info",
> diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
> index ec29060..ab023a2 100644
> --- a/tools/libxl/libxl_dom.c
> +++ b/tools/libxl/libxl_dom.c
> @@ -277,6 +277,16 @@ err:
>  }
>  #endif
>  
> +#if defined(__arm__) || defined(__aarch64__)
> +static void pv_set_conf_params(xc_interface *handle, uint32_t domid,
> +                               libxl_domain_build_info *const info)
> +{
> +    if ( libxl_defbool_val(info->u.pv.altp2m) )

Coding style.

> +        xc_hvm_param_set(handle, domid, HVM_PARAM_ALTP2M,
> +                         libxl_defbool_val(info->u.pv.altp2m));
> +}
> +#endif
> +
>  static void hvm_set_conf_params(xc_interface *handle, uint32_t domid,
>                                  libxl_domain_build_info *const info)
>  {
> @@ -433,6 +443,10 @@ int libxl__build_pre(libxl__gc *gc, uint32_t domid,
>              return rc;
>  #endif
>      }
> +#if defined(__arm__) || defined(__aarch64__)
> +    else /* info->type == LIBXL_DOMAIN_TYPE_PV */
> +        pv_set_conf_params(ctx->xch, domid, info);
> +#endif
>  
>      rc = libxl__arch_domain_create(gc, d_config, domid);
>  
> diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
> index ef614be..0a164f9 100644
> --- a/tools/libxl/libxl_types.idl
> +++ b/tools/libxl/libxl_types.idl
> @@ -554,6 +554,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
>                                        ("features", string, {'const': True}),
>                                        # Use host's E820 for PCI passthrough.
>                                        ("e820_host", libxl_defbool),
> +                                      ("altp2m", libxl_defbool),

Why is this placed in PV instead of arch_arm?

You would also need a LIBXL_HAVE macro in libxl.h for the new field.

>                                        ])),
>                   ("invalid", None),
>                   ], keyvar_init_val = "LIBXL_DOMAIN_TYPE_INVALID")),
> diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
> index 6459eec..12c6e48 100644
> --- a/tools/libxl/xl_cmdimpl.c
> +++ b/tools/libxl/xl_cmdimpl.c
> @@ -1718,6 +1718,11 @@ static void parse_config_data(const char 
> *config_source,
>              exit(1);
>          }
>  
> +#if defined(__arm__) || defined(__aarch64__)
> +        /* Enable altp2m for PV guests solely on ARM */
> +        xlu_cfg_get_defbool(config, "altp2m", &b_info->u.pv.altp2m, 0);
> +#endif
> +
>          break;
>      }
>      default:
> -- 
> 2.8.3
> 

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