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

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Date:   Thu, 23 Jan 2020 14:49:14 -0500
From:   Qian Cai <cai@....pw>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Ingo Molnar <mingo@...hat.com>, 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 Jan 22, 2020, at 2:17 PM, 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?

https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config

BTW, this will also trigger a compilation breakage,

ld: arch/x86/platform/efi/efi_64.o: in function `efi_set_virtual_address_map':
efi_64.c:(.init.text+0x1419): undefined reference to `__efi64_thunk'
ld: efi_64.c:(.init.text+0x1530): undefined reference to `efi_uv1_memmap_phys_prolog'
ld: efi_64.c:(.init.text+0x1706): undefined reference to `efi_uv1_memmap_phys_epilog’

Likely due to the commit “efi/x86: avoid KASAN false positives when accessing the 1:1 mapping”

Looks like you are in process fixing that one as well.