path: root/Documentation/x86
diff options
authorDave Young <dyoung@redhat.com>2013-12-20 10:02:20 (GMT)
committerMatt Fleming <matt.fleming@intel.com>2013-12-29 13:09:06 (GMT)
commit456a29ddada79198c5965300e04103c40c481f62 (patch)
tree3efa843160c0827cb165dbdf8c3b18c05ec98a7c /Documentation/x86
parent1fec0533693cd74f2d1a46edd29449cfee429df0 (diff)
x86: Add xloadflags bit for EFI runtime support on kexec
Old kexec-tools can not load new kernels. The reason is kexec-tools does not fill efi_info in x86 setup header previously, thus EFI failed to initialize. In new kexec-tools it will by default to fill efi_info and pass other EFI required infomation to 2nd kernel so kexec kernel EFI initialization can succeed finally. To prevent from breaking userspace, add a new xloadflags bit so kexec-tools can check the flag and switch to old logic. Signed-off-by: Dave Young <dyoung@redhat.com> Acked-by: Borislav Petkov <bp@suse.de> Tested-by: Toshi Kani <toshi.kani@hp.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'Documentation/x86')
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
index f4f268c..cb81741d 100644
--- a/Documentation/x86/boot.txt
+++ b/Documentation/x86/boot.txt
@@ -608,6 +608,9 @@ Protocol: 2.12+
- If 1, the kernel supports the 64-bit EFI handoff entry point
given at handover_offset + 0x200.
+ Bit 4 (read): XLF_EFI_KEXEC
+ - If 1, the kernel supports kexec EFI boot with EFI runtime support.
Field name: cmdline_size
Type: read
Offset/size: 0x238/4

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