linux-kernel - Re: [PATCH] x86/efi Fix regression in efi_arch_mem

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Date:   Wed, 21 Dec 2016 22:30:54 +0000
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Petr Oros <poros@...hat.com>
Cc:     ard.biesheuvel@...aro.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/efi Fix regression in efi_arch_mem_reserve

On Wed, 21 Dec, at 02:11:38PM, Petr Oros wrote:
>   Booting on EFI with ESRT table has been stop since commit:
>     8e80632 efi/esrt: Use efi_mem_reserve() and avoid a kmalloc()
> 
>   This is caused by this commit:
>     816e761 efi: Allow drivers to reserve boot services forever
> 
>   Problem is, that efi_memmap_insert need memory aligned
>   on EFI_PAGE_SIZE. If memory not aligned, efi_memmap_insert
>   just return and let efi.memmap in inconsistent state.
>   This breaking boot.
> 
>   Tested in my machine, which stop booting
>   after upgrade to 4.9
> 
> Signed-off-by: Petr Oros <poros@...hat.com>
> ---
>  arch/x86/platform/efi/quirks.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Could you provide some more information? Why does efi_memmap_insert()
require this alignment? How does booting "break"? If you see an Oops,
please post it here.