linux-kernel - Re: [PATCH -next] efi/libstub/x86: fix an EFI server boot failure

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Date:   Wed, 22 Jan 2020 20:22:40 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Qian Cai <cai@....pw>, Ingo Molnar <mingo@...hat.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-efi <linux-efi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] efi/libstub/x86: fix an EFI server boot failure

On Wed, 22 Jan 2020 at 20:17, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
>
> On Wed, 22 Jan 2020 at 20:15, Qian Cai <cai@....pw> wrote:
> >
> > x86_64 EFI systems are unable to boot due to a typo in the recent commit.
> >
> > EFI config tables not found.
> >  -- System halted
> >
> > Fixes: 796eb8d26a57 ("efi/libstub/x86: Use const attribute for efi_is_64bit()")
> > Signed-off-by: Qian Cai <cai@....pw>
> > ---
> >  arch/x86/boot/compressed/eboot.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
> > index 82e26d0ff075..287393d725f0 100644
> > --- a/arch/x86/boot/compressed/eboot.c
> > +++ b/arch/x86/boot/compressed/eboot.c
> > @@ -32,7 +32,7 @@ __attribute_const__ bool efi_is_64bit(void)
> >  {
> >         if (IS_ENABLED(CONFIG_EFI_MIXED))
> >                 return efi_is64;
> > -       return IS_ENABLED(CONFIG_X64_64);
> > +       return IS_ENABLED(CONFIG_X86_64);
> >  }
> >
> >  static efi_status_t
>
> Apologies for the breakage - your fix is obviously correct. But I did
> test this code, so I am curious why I didn't see this problem. Are you
> booting via GRUB or from the UEFI shell? Can you share your .config
> please?

Hmm, I guess it is simply the absence of CONFIG_EFI_MIXED=y ...

Acked-by: Ard Biesheuvel <ardb@...nel.org>

Ingo, Thomas, could you drop this into efi/core directly please? Thanks.