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efi: Export EFI runtime memory mapping to sysfs

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kexec kernel will need exactly same mapping for EFI runtime memory
ranges. Thus here export the runtime ranges mapping to sysfs,
kexec-tools will assemble them and pass to 2nd kernel via setup_data.

Introducing a new directory /sys/firmware/efi/runtime-map just like
/sys/firmware/memmap. Containing below attribute in each file of that
directory:

attribute  num_pages  phys_addr  type  virt_addr

Signed-off-by: Dave Young <dyoung@redhat.com>
Tested-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
This commit is contained in:
Dave Young
2013-12-20 18:02:18 +08:00
committed by Matt Fleming
parent a0998eb15a
commit 926172d460
7 changed files with 287 additions and 3 deletions
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4
drivers/firmware/efi/efi.c
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@@ -167,6 +167,10 @@ static int __init efisubsys_init(void)
goto err_unregister;
}
error = efi_runtime_map_init(efi_kobj);
if (error)
goto err_remove_group;
/* and the standard mountpoint for efivarfs */
efivars_kobj = kobject_create_and_add("efivars", efi_kobj);
if (!efivars_kobj) {