Re: [Xen-devel] [PATCH v3 17/17] Xen: EFI: Parse DT parameters for Xen specific UEFI

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Sat, 23 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
> 
> Add a new function to parse DT parameters for Xen specific UEFI just
> like the way for normal UEFI. Then it could reuse the existing codes.
> 
> If Xen supports EFI, initialize runtime services.
> 
> Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Reviewed-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>


> CC: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
> ---
>  arch/arm/xen/enlighten.c   |  6 ++++++
>  arch/arm64/kernel/efi.c    | 17 ++++++++++++-----
>  drivers/firmware/efi/efi.c | 45 ++++++++++++++++++++++++++++++++++++++-------
>  3 files changed, 56 insertions(+), 12 deletions(-)
> 
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index cdc0bd2..608d735 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -245,6 +245,12 @@ static int __init fdt_find_hyper_node(unsigned long 
> node, const char *uname,
>           !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
>               hyper_node.version = s + strlen(hyper_node.prefix);
>  
> +     if (IS_ENABLED(CONFIG_XEN_EFI)) {
> +             /* Check if Xen supports EFI */
> +             if (of_get_flat_dt_subnode_by_name(node, "uefi") > 0)
> +                     set_bit(EFI_PARAVIRT, &efi.flags);
> +     }
> +
>       return 0;
>  }
>  
> diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
> index 4eeb171..3c46129 100644
> --- a/arch/arm64/kernel/efi.c
> +++ b/arch/arm64/kernel/efi.c
> @@ -33,6 +33,7 @@
>  #include <asm/mmu_context.h>
>  #include <asm/mmu.h>
>  #include <asm/pgtable.h>
> +#include <asm/xen/xen-ops.h>
>  
>  struct efi_memory_map memmap;
>  
> @@ -308,13 +309,19 @@ static int __init arm64_enable_runtime_services(void)
>       }
>       set_bit(EFI_SYSTEM_TABLES, &efi.flags);
>  
> -     if (!efi_virtmap_init()) {
> -             pr_err("No UEFI virtual mapping was installed -- runtime 
> services will not be available\n");
> -             return -ENOMEM;
> +     if (IS_ENABLED(CONFIG_XEN_EFI) && efi_enabled(EFI_PARAVIRT)) {
> +             /* Set up runtime services function pointers for Xen Dom0 */
> +             xen_efi_runtime_setup();
> +     } else {
> +             if (!efi_virtmap_init()) {
> +                     pr_err("No UEFI virtual mapping was installed -- 
> runtime services will not be available\n");
> +                     return -ENOMEM;
> +             }
> +
> +             /* Set up runtime services function pointers */
> +             efi_native_runtime_setup();
>       }
>  
> -     /* Set up runtime services function pointers */
> -     efi_native_runtime_setup();
>       set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
>  
>       efi.runtime_version = efi.systab->hdr.revision;
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index 027ca21..bdcf6d7 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -498,12 +498,14 @@ device_initcall(efi_load_efivars);
>               FIELD_SIZEOF(struct efi_fdt_params, field) \
>       }
>  
> -static __initdata struct {
> +struct params {
>       const char name[32];
>       const char propname[32];
>       int offset;
>       int size;
> -} dt_params[] = {
> +};
> +
> +static struct params fdt_params[] __initdata = {
>       UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
>       UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
>       UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
> @@ -511,24 +513,45 @@ static __initdata struct {
>       UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
>  };
>  
> +static struct params xen_fdt_params[] __initdata = {
> +     UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
> +     UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
> +     UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
> +     UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
> +     UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
> +};
> +
>  struct param_info {
>       int found;
>       void *params;
> +     struct params *dt_params;
> +     int size;
>  };
>  
>  static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
>                                      int depth, void *data)
>  {
>       struct param_info *info = data;
> +     struct params *dt_params = info->dt_params;
>       const void *prop;
>       void *dest;
>       u64 val;
> -     int i, len;
> +     int i, len, offset;
>  
> -     if (depth != 1 || strcmp(uname, "chosen") != 0)
> -             return 0;
> +     if (efi_enabled(EFI_PARAVIRT)) {
> +             if (depth != 1 || strcmp(uname, "hypervisor") != 0)
> +                     return 0;
>  
> -     for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
> +             offset = of_get_flat_dt_subnode_by_name(node, "uefi");
> +             if (offset < 0)
> +                     return 0;
> +             node = offset;
> +     } else {
> +             if (depth != 1 || strcmp(uname, "chosen") != 0)
> +                     return 0;
> +     }
> +
> +     for (i = 0; i < info->size; i++) {
>               prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
>               if (!prop)
>                       return 0;
> @@ -559,12 +582,20 @@ int __init efi_get_fdt_params(struct efi_fdt_params 
> *params)
>       info.found = 0;
>       info.params = params;
>  
> +     if (efi_enabled(EFI_PARAVIRT)) {
> +             info.dt_params = xen_fdt_params;
> +             info.size = ARRAY_SIZE(xen_fdt_params);
> +     } else {
> +             info.dt_params = fdt_params;
> +             info.size = ARRAY_SIZE(fdt_params);
> +     }
> +
>       ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
>       if (!info.found)
>               pr_info("UEFI not found.\n");
>       else if (!ret)
>               pr_err("Can't find '%s' in device tree!\n",
> -                    dt_params[info.found].name);
> +                    info.dt_params[info.found].name);
>  
>       return ret;
>  }
> -- 
> 2.0.4
> 
> 

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