linux-kernel - Re: [GIT PULL 0/9] EFI fixes for v5.7-rc

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Date:   Thu, 9 Apr 2020 19:57:16 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-efi <linux-efi@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Borislav Petkov <bp@...e.de>,
        Colin Ian King <colin.king@...onical.com>,
        Gary Lin <glin@...e.com>, Jiri Slaby <jslaby@...e.cz>,
        Sergey Shatunov <me@...k.pw>, Takashi Iwai <tiwai@...e.de>
Subject: Re: [GIT PULL 0/9] EFI fixes for v5.7-rc

On Thu, Apr 09, 2020 at 11:29:06PM +0200, Ard Biesheuvel wrote:
> > What happens is that the kexec'ed kernel immediately crashes, at which
> > point we drop back into the BIOS, and then it boots the Debain 4.19.0
> > distro kernel instead of the kernel to be tested boot.  Since we lose
> > the boot command line that was used from the kexec, the gce-xfstests
> > image retries the kexec, which fails, and the failing kexec repeats
> > until I manually kill the VM.
>
> Does this help at all?
> 
> diff --git a/arch/x86/include/asm/efi.h b/arch/x86/include/asm/efi.h
> index 781170d36f50..52f8138243df 100644
> --- a/arch/x86/include/asm/efi.h
> +++ b/arch/x86/include/asm/efi.h
> @@ -180,6 +180,7 @@ extern void __init
> efi_uv1_memmap_phys_epilog(pgd_t *save_pgd);
> 
>  struct efi_setup_data {
>         u64 fw_vendor;
> +       u64 __unused;
>         u64 tables;
>         u64 smbios;
>         u64 reserved[8];


Tested-by: Theodore Ts'o <tytso@....edu>

Yep, that fixed it.  Thanks!!

I wonder if this structure definition should be moved something like
arch/x86/include/uapi/asm/efi.h so it's more obvious that the
structure layout is used externally to the kernel?

						- Ted