linux-kernel - Re: [PATCH 0/4] riscv: 64-bit NOMMU fixes and enhancements

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Message-ID: <e07f9c83-1d57-45aa-98eb-982371d1d02e@sifive.com>
Date: Tue, 27 Feb 2024 12:51:04 -0600
From: Samuel Holland <samuel.holland@...ive.com>
To: Conor Dooley <conor.dooley@...rochip.com>
Cc: Palmer Dabbelt <palmer@...belt.com>, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] riscv: 64-bit NOMMU fixes and enhancements

Hi Conor,

On 2024-02-27 6:13 AM, Conor Dooley wrote:
> On Mon, Feb 26, 2024 at 04:34:45PM -0800, Samuel Holland wrote:
>> This series aims to improve support for NOMMU, specifically by making it
>> easier to test NOMMU kernels in QEMU and on various widely-available
>> hardware (errata permitting). After all, everything supports Svbare...
>>
>> After applying this series, a NOMMU kernel based on defconfig (changing
>> only the three options below*) boots to userspace on QEMU when passed as
>> -kernel.
>>
>>   # CONFIG_RISCV_M_MODE is not set
>>   # CONFIG_MMU is not set
>>   CONFIG_NONPORTABLE=y
>>
>> *if you are using LLD, you must also disable BPF_SYSCALL and KALLSYMS,
>> because LLD bails on out-of-range references to undefined weak symbols.
> 
> That's not new to these patches though, right? IIRC that's an existing
> issue.

Yes, that's correct. I see that arch/riscv/configs/nommu_* have KALLSYMS
disabled already; this may be the reason.

Regards,
Samuel