efi/x86: Revert struct layout change to fix kexec boot regression
Commit0a67361dcd
("efi/x86: Remove runtime table address from kexec EFI setup data") removed the code that retrieves the non-remapped UEFI runtime services pointer from the data structure provided by kexec, as it was never really needed on the kexec boot path: mapping the runtime services table at its non-remapped address is only needed when calling SetVirtualAddressMap(), which never happens during a kexec boot in the first place. However, dropping the 'runtime' member from struct efi_setup_data was a mistake. That struct is shared ABI between the kernel and the kexec tooling for x86, and so we cannot simply change its layout. So let's put back the removed field, but call it 'unused' to reflect the fact that we never look at its contents. While at it, add a comment to remind our future selves that the layout is external ABI. Fixes:0a67361dcd
("efi/x86: Remove runtime table address from kexec EFI setup data") Reported-by: Theodore Ts'o <tytso@mit.edu> Tested-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Dave Young <dyoung@redhat.com> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -178,8 +178,10 @@ extern void efi_free_boot_services(void);
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extern pgd_t * __init efi_uv1_memmap_phys_prolog(void);
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extern void __init efi_uv1_memmap_phys_epilog(pgd_t *save_pgd);
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/* kexec external ABI */
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struct efi_setup_data {
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u64 fw_vendor;
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u64 __unused;
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u64 tables;
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u64 smbios;
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u64 reserved[8];
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