Re: [PATCH v3 2/2] x86/xen: Allow per-domain usage of hardware virtualized APIC

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Fri, Feb 18, 2022 at 05:29:43PM +0000, Jane Malalane wrote:
> diff --git a/tools/include/libxl.h b/tools/include/libxl.h
> index 333ffad38d..1c83cae711 100644
> --- a/tools/include/libxl.h
> +++ b/tools/include/libxl.h
> @@ -535,6 +535,13 @@
>  #define LIBXL_HAVE_PHYSINFO_ASSISTED_APIC 1
>  
>  /*
> + * LIBXL_HAVE_ASSISTED_APIC indicates that libxl_domain_build_info has
> + * assisted_x{2}apic fields, for enabling hardware assisted virtualization 
> for

Could you spell out both "assisted_xapic and assisted_x2apic" as that
would allow for grep to find both string.

> + * x{2}apic per domain.
> + */
> +#define LIBXL_HAVE_ASSISTED_APIC 1
> +
> +/*
> diff --git a/tools/libs/light/libxl_arm.c b/tools/libs/light/libxl_arm.c
> index 39fdca1b49..ba5b8f433f 100644
> --- a/tools/libs/light/libxl_arm.c
> +++ b/tools/libs/light/libxl_arm.c
> @@ -1384,8 +1384,9 @@ void 
> libxl__arch_domain_create_info_setdefault(libxl__gc *gc,
>      }
>  }
>  
> -void libxl__arch_domain_build_info_setdefault(libxl__gc *gc,
> -                                              libxl_domain_build_info 
> *b_info)
> +int libxl__arch_domain_build_info_setdefault(libxl__gc *gc,
> +                                             libxl_domain_build_info *b_info,
> +                                             const libxl_physinfo *physinfo)
>  {
>      /* ACPI is disabled by default */
>      libxl_defbool_setdefault(&b_info->acpi, false);
> @@ -1399,6 +1400,8 @@ void libxl__arch_domain_build_info_setdefault(libxl__gc 
> *gc,

There is another return in this function, which want to return 0 rather
than void.

>      memset(&b_info->u, '\0', sizeof(b_info->u));
>      b_info->type = LIBXL_DOMAIN_TYPE_INVALID;
>      libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_PVH);
> +
> +    return 0;
>  }
>  
>  int libxl__arch_passthrough_mode_setdefault(libxl__gc *gc,
> diff --git a/tools/libs/light/libxl_x86.c b/tools/libs/light/libxl_x86.c
> index e0a06ecfe3..c377d13b19 100644
> --- a/tools/libs/light/libxl_x86.c
> +++ b/tools/libs/light/libxl_x86.c
> @@ -819,11 +827,27 @@ void 
> libxl__arch_domain_create_info_setdefault(libxl__gc *gc,
>  {
>  }
>  
> -void libxl__arch_domain_build_info_setdefault(libxl__gc *gc,
> -                                              libxl_domain_build_info 
> *b_info)
> +int libxl__arch_domain_build_info_setdefault(libxl__gc *gc,
> +                                             libxl_domain_build_info *b_info,
> +                                             const libxl_physinfo *physinfo)
>  {
>      libxl_defbool_setdefault(&b_info->acpi, true);
>      libxl_defbool_setdefault(&b_info->arch_x86.msr_relaxed, false);
> +
> +    if (b_info->type != LIBXL_DOMAIN_TYPE_PV) {
> +        libxl_defbool_setdefault(&b_info->arch_x86.assisted_xapic,
> +                             physinfo->cap_assisted_xapic);
> +        libxl_defbool_setdefault(&b_info->arch_x86.assisted_x2apic,
> +                             physinfo->cap_assisted_x2apic);
> +    }
> +
> +    else if (!libxl_defbool_is_default(b_info->arch_x86.assisted_xapic) ||

This "else" needs to be on the same line as the "}" 2 lines above.

> +             !libxl_defbool_is_default(b_info->arch_x86.assisted_x2apic)) {
> +        LOG(ERROR, "Interrupt Controller Virtualization not supported for 
> PV");
> +        return ERROR_INVAL;
> +    }
> +
> +    return 0;

Thanks,

-- 
Anthony PERARD