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kexec: support kexec/kdump on EFI systems

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This patch does two things.  It passes EFI run time mappings to second
kernel in bootparams efi_info.  Second kernel parse this info and create
new mappings in second kernel.  That means mappings in first and second
kernel will be same.  This paves the way to enable EFI in kexec kernel.

This patch also prepares and passes EFI setup data through bootparams.
This contains bunch of information about various tables and their
addresses.

These information gathering and passing has been written along the lines
of what current kexec-tools is doing to make kexec work with UEFI.

[akpm@linux-foundation.org: s/get_efi/efi_get/g, per Matt]
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Greg Kroah-Hartman <greg@kroah.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: WANG Chao <chaowang@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vivek Goyal
2014-08-08 14:26:11 -07:00
committed by Linus Torvalds
parent dd5f726076
commit 6a2c20e7d8
3 changed files with 174 additions and 12 deletions
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19
include/linux/efi.h
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@@ -1156,6 +1156,9 @@ int efivars_sysfs_init(void);
#ifdef CONFIG_EFI_RUNTIME_MAP
int efi_runtime_map_init(struct kobject *);
void efi_runtime_map_setup(void *, int, u32);
int efi_get_runtime_map_size(void);
int efi_get_runtime_map_desc_size(void);
int efi_runtime_map_copy(void *buf, size_t bufsz);
#else
static inline int efi_runtime_map_init(struct kobject *kobj)
{
@@ -1164,6 +1167,22 @@ static inline int efi_runtime_map_init(struct kobject *kobj)
static inline void
efi_runtime_map_setup(void *map, int nr_entries, u32 desc_size) {}
static inline int efi_get_runtime_map_size(void)
{
return 0;
}
static inline int efi_get_runtime_map_desc_size(void)
{
return 0;
}
static inline int efi_runtime_map_copy(void *buf, size_t bufsz)
{
return 0;
}
#endif
/* prototypes shared between arch specific and generic stub code */