linux-kernel - Re: [PATCH v8 1/3] riscv: Introduce CONFIG

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Date:   Fri, 12 May 2023 11:41:19 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     schwab@...ux-m68k.org
CC:     alex@...ti.fr, alexghiti@...osinc.com, mpe@...erman.id.au,
        npiggin@...il.com, christophe.leroy@...roup.eu,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject:     Re: [PATCH v8 1/3] riscv: Introduce CONFIG_RELOCATABLE

On Thu, 11 May 2023 11:18:23 PDT (-0700), schwab@...ux-m68k.org wrote:
> On Mai 09 2023, Alexandre Ghiti wrote:
>
>> On 5/9/23 21:07, Andreas Schwab wrote:
>>> That does not work with UEFI booting:
>>>
>>> Loading Linux 6.4.0-rc1-1.g668187d-default ...
>>> Loading initial ramdisk ...
>>> Unhandled exception: Instruction access fault
>>> EPC: ffffffff80016d56 RA: 000000008020334e TVAL: 0000007f80016d56
>>> EPC: ffffffff002d1d56 RA: 00000000004be34e reloc adjusted
>>> Unhandled exception: Load access fault
>>> EPC: 00000000fff462d4 RA: 00000000fff462d0 TVAL: ffffffff80016d56
>>> EPC: 00000000802012d4 RA: 00000000802012d0 reloc adjusted
>>>
>>> Code: c825 8e0d 05b3 40b4 d0ef 0636 7493 ffe4 (d783 0004)
>>> UEFI image [0x00000000fe65e000:0x00000000fe6e3fff] '/efi\boot\bootriscv64.efi'
>>> UEFI image [0x00000000daa82000:0x00000000dcc2afff]
>>>
>>
>> I need more details please, as I have a UEFI bootflow and it works great
>> (KASLR is based on a relocatable kernel and works fine in UEFI too).
>
> It also crashes without UEFI.  Disabling CONFIG_RELOCATABLE fixes that.
> This was tested on the HiFive Unmatched board.
> The kernel image I tested is available from
> <https://download.opensuse.org/repositories/Kernel:/HEAD/RISCV/>.  The
> same kernel with CONFIG_RELOCATABLE disabled is available from
> <https://download.opensuse.org/repositories/home:/Andreas_Schwab:/riscv:/kernel/standard/>.

Sorry I missed this earlier, there's been some other reports of boot 
failures on rc1 showing up but those were all a lot more vague.  Just 
setting CONFIG_RELOCATABLE=y doesn't manifest a boot failure on QEMU on 
my end and I don't have an UNmatched floating around.

Alex says he's going to look into it (and IIRC he has my Unmatched...).