Re: [Xen-devel] [PATCH 05/18] efi: split efi_enabled to efi_platform and efi_loader

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Fri, 30 Jan 2015, Daniel Kiper wrote:
> We need more fine grained knowledge about EFI environment and check
> for EFI platform and EFI loader separately to properly support
> multiboot2 protocol. In general Xen loaded by this protocol uses
> memory mappings and loaded modules in simliar way to Xen loaded
> by multiboot (v1) protocol. Hence, split efi_enabled to efi_platform
> and efi_loader.
> 
> Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
> ---
>  xen/arch/x86/dmi_scan.c    |    4 ++--
>  xen/arch/x86/domain_page.c |    2 +-
>  xen/arch/x86/efi/stub.c    |    5 +++--
>  xen/arch/x86/mpparse.c     |    4 ++--
>  xen/arch/x86/setup.c       |    8 ++++----
>  xen/arch/x86/time.c        |    2 +-
>  xen/common/efi/boot.c      |    5 +++++
>  xen/common/efi/runtime.c   |    5 +++--
>  xen/drivers/acpi/osl.c     |    2 +-
>  xen/include/xen/efi.h      |    6 +++++-
>  10 files changed, 27 insertions(+), 16 deletions(-)
> 
> diff --git a/xen/arch/x86/dmi_scan.c b/xen/arch/x86/dmi_scan.c
> index 500133a..63b976c 100644
> --- a/xen/arch/x86/dmi_scan.c
> +++ b/xen/arch/x86/dmi_scan.c
> @@ -150,7 +150,7 @@ int __init dmi_get_table(u32 *base, u32 *len)
>       struct dmi_eps eps;
>       char __iomem *p, *q;
>  
> -     if (efi_enabled) {
> +     if (efi_platform) {
>               if (!efi_dmi_size)
>                       return -1;
>               *base = efi_dmi_address;
> @@ -516,7 +516,7 @@ static void __init dmi_decode(struct dmi_header *dm)
>  
>  void __init dmi_scan_machine(void)
>  {
> -     if ((!efi_enabled ? dmi_iterate(dmi_decode) :
> +     if ((!efi_platform ? dmi_iterate(dmi_decode) :
>                           dmi_efi_iterate(dmi_decode)) == 0)
>               dmi_check_system(dmi_blacklist);
>       else
> diff --git a/xen/arch/x86/domain_page.c b/xen/arch/x86/domain_page.c
> index 158a164..5d4564c 100644
> --- a/xen/arch/x86/domain_page.c
> +++ b/xen/arch/x86/domain_page.c
> @@ -45,7 +45,7 @@ static inline struct vcpu *mapcache_current_vcpu(void)
>              sync_local_execstate();
>          /* We must now be running on the idle page table. */
>          ASSERT((cr3 = read_cr3()) == __pa(idle_pg_table) ||
> -               (efi_enabled && cr3 == efi_rs_page_table()));
> +               (efi_platform && cr3 == efi_rs_page_table()));
>      }
>  
>      return v;
> diff --git a/xen/arch/x86/efi/stub.c b/xen/arch/x86/efi/stub.c
> index b8f49f8..5060e6f 100644
> --- a/xen/arch/x86/efi/stub.c
> +++ b/xen/arch/x86/efi/stub.c
> @@ -3,8 +3,9 @@
>  #include <xen/init.h>
>  #include <xen/lib.h>
>  
> -#ifndef efi_enabled
> -const bool_t efi_enabled = 0;
> +#ifndef efi_platform
> +bool_t efi_platform = 0;
> +bool_t efi_loader = 0;
>  #endif
>  
>  void __init efi_init_memory(void) { }
> diff --git a/xen/arch/x86/mpparse.c b/xen/arch/x86/mpparse.c
> index a38e016..c4e3041 100644
> --- a/xen/arch/x86/mpparse.c
> +++ b/xen/arch/x86/mpparse.c
> @@ -540,7 +540,7 @@ static inline void __init 
> construct_default_ISA_mptable(int mpc_default_type)
>  
>  static __init void efi_unmap_mpf(void)
>  {
> -     if (efi_enabled)
> +     if (efi_platform)
>               __set_fixmap(FIX_EFI_MPF, 0, 0);
>  }
>  
> @@ -698,7 +698,7 @@ void __init find_smp_config (void)
>  {
>       unsigned int address;
>  
> -     if (efi_enabled) {
> +     if (efi_platform) {
>               efi_check_config();
>               return;
>       }
> diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
> index c27c49c..711fdb0 100644
> --- a/xen/arch/x86/setup.c
> +++ b/xen/arch/x86/setup.c
> @@ -431,7 +431,7 @@ static void __init parse_video_info(void)
>      struct boot_video_info *bvi = &bootsym(boot_vid_info);
>  
>      /* The EFI loader fills vga_console_info directly. */
> -    if ( efi_enabled )
> +    if ( efi_platform )
>          return;
>  
>      if ( (bvi->orig_video_isVGA == 1) && (bvi->orig_video_mode == 3) )
> @@ -663,7 +663,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
>      if ( ((unsigned long)cpu0_stack & (STACK_SIZE-1)) != 0 )
>          panic("Misaligned CPU0 stack.");
>  
> -    if ( efi_enabled )
> +    if ( efi_loader )
>      {
>          set_pdx_range(xen_phys_start >> PAGE_SHIFT,
>                        (xen_phys_start + BOOTSTRAP_MAP_BASE) >> PAGE_SHIFT);
> @@ -774,7 +774,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
>       * we can relocate the dom0 kernel and other multiboot modules. Also, on
>       * x86/64, we relocate Xen to higher memory.
>       */
> -    for ( i = 0; !efi_enabled && i < mbi->mods_count; i++ )
> +    for ( i = 0; !efi_loader && i < mbi->mods_count; i++ )
>      {
>          if ( mod[i].mod_start & (PAGE_SIZE - 1) )
>              panic("Bootloader didn't honor module alignment request.");
> @@ -962,7 +962,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
>  
>      if ( !xen_phys_start )
>          panic("Not enough memory to relocate Xen.");
> -    reserve_e820_ram(&boot_e820, efi_enabled ? mbi->mem_upper : 
> __pa(&_start),
> +    reserve_e820_ram(&boot_e820, efi_loader ? mbi->mem_upper : __pa(&_start),
>                       __pa(&_end));
>  
>      /* Late kexec reservation (dynamic start address). */
> diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
> index 74c01e3..cdd17cb 100644
> --- a/xen/arch/x86/time.c
> +++ b/xen/arch/x86/time.c
> @@ -689,7 +689,7 @@ static unsigned long get_cmos_time(void)
>      static bool_t __read_mostly cmos_rtc_probe;
>      boolean_param("cmos-rtc-probe", cmos_rtc_probe);
>  
> -    if ( efi_enabled )
> +    if ( efi_platform )
>      {
>          res = efi_get_time();
>          if ( res )
> diff --git a/xen/common/efi/boot.c b/xen/common/efi/boot.c
> index ac6881e..8aafcfd 100644
> --- a/xen/common/efi/boot.c
> +++ b/xen/common/efi/boot.c
> @@ -708,6 +708,11 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE 
> *SystemTable)
>      char *option_str;
>      bool_t use_cfg_file;
>  
> +#ifndef CONFIG_ARM /* TODO - disabled until implemented on ARM */
> +    efi_platform = 1;
> +    efi_loader = 1;
> +#endif

What exactly needs to be implemented on ARM?  I thought that EFI ARM
support for Xen is pretty much complete.


>      efi_ih = ImageHandle;
>      efi_bs = SystemTable->BootServices;
>      efi_rs = SystemTable->RuntimeServices;
> diff --git a/xen/common/efi/runtime.c b/xen/common/efi/runtime.c
> index c840e08..b229c69 100644
> --- a/xen/common/efi/runtime.c
> +++ b/xen/common/efi/runtime.c
> @@ -11,13 +11,14 @@ DEFINE_XEN_GUEST_HANDLE(CHAR16);
>  #ifndef COMPAT
>  
>  #ifdef CONFIG_ARM  /* Disabled until runtime services implemented */
> -const bool_t efi_enabled = 0;
> +const bool_t efi_platform = 0;
>  #else
>  # include <asm/i387.h>
>  # include <asm/xstate.h>
>  # include <public/platform.h>
>  
> -const bool_t efi_enabled = 1;
> +bool_t efi_platform = 0;
> +bool_t efi_loader = 0;
>  #endif
>  
>  unsigned int __read_mostly efi_num_ct;
> diff --git a/xen/drivers/acpi/osl.c b/xen/drivers/acpi/osl.c
> index 93c983c..b066459 100644
> --- a/xen/drivers/acpi/osl.c
> +++ b/xen/drivers/acpi/osl.c
> @@ -66,7 +66,7 @@ void __init acpi_os_vprintf(const char *fmt, va_list args)
>  
>  acpi_physical_address __init acpi_os_get_root_pointer(void)
>  {
> -     if (efi_enabled) {
> +     if (efi_platform) {
>               if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
>                       return efi.acpi20;
>               else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
> diff --git a/xen/include/xen/efi.h b/xen/include/xen/efi.h
> index 5e02724..54cd390 100644
> --- a/xen/include/xen/efi.h
> +++ b/xen/include/xen/efi.h
> @@ -5,7 +5,11 @@
>  #include <xen/types.h>
>  #endif
>  
> -extern const bool_t efi_enabled;
> +/* If true then Xen runs on EFI platform. */
> +extern bool_t efi_platform;
> +
> +/* If true then Xen was loaded by native EFI loader as PE application. */
> +extern bool_t efi_loader;
>  
>  #define EFI_INVALID_TABLE_ADDR (~0UL)
>  
> -- 
> 1.7.10.4
> 

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