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>
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@ -608,6 +608,9 @@ Protocol: 2.12+
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- If 1, the kernel supports the 64-bit EFI handoff entry point
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given at handover_offset + 0x200.
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Bit 4 (read): XLF_EFI_KEXEC
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- If 1, the kernel supports kexec EFI boot with EFI runtime support.
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Field name: cmdline_size
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Type: read
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Offset/size: 0x238/4
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@ -391,7 +391,14 @@ xloadflags:
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#else
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# define XLF23 0
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#endif
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.word XLF0 | XLF1 | XLF23
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#if defined(CONFIG_X86_64) && defined(CONFIG_EFI) && defined(CONFIG_KEXEC)
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# define XLF4 XLF_EFI_KEXEC
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#else
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# define XLF4 0
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#endif
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.word XLF0 | XLF1 | XLF23 | XLF4
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cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line,
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#added with boot protocol
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@ -24,6 +24,7 @@
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#define XLF_CAN_BE_LOADED_ABOVE_4G (1<<1)
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#define XLF_EFI_HANDOVER_32 (1<<2)
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#define XLF_EFI_HANDOVER_64 (1<<3)
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#define XLF_EFI_KEXEC (1<<4)
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#ifndef __ASSEMBLY__
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