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bug#31380: grub fails to build on i686-linux
From: |
Mark H Weaver |
Subject: |
bug#31380: grub fails to build on i686-linux |
Date: |
Sat, 16 Jun 2018 04:22:35 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) |
Hi Ludovic,
address@hidden (Ludovic Courtès) writes:
> Mark H Weaver <address@hidden> skribis:
>
>> Here's a proposed patch that I hope will fix the problem, although I'm
>> unable to easily test it because I no longer use binary substitutes, and
>> I have not yet built the core packages for i686-linux.
>>
>> However, I've applied this patch to my x86_64 system, and verified that
>> it does not cause any problems there.
>>
>> Would someone be willing to test it and report back?
>
> I tried it and it initially failed to build with:
[...]
> I fixed this and pushed as a7c8716928a240ba2c36d360e4ffeb447671fa6b.
Thanks very much! Hydra has now successfully built GRUB on i686-linux,
so I'm closing this bug.
> I wanted to try ‘guix system vm-image -s i686-linux’ on my x86_64 laptop
> to make sure GRUB runs fine. Unfortunately, I stumbled upon another
> issue, which is that qemu-system-i386 built for i686-linux segfaults at
> startup:
[...]
> I was able to work around it by disabling KVM:
>
> diff --git a/gnu/build/vm.scm b/gnu/build/vm.scm
> index 73d0191de..a675111d4 100644
> --- a/gnu/build/vm.scm
> +++ b/gnu/build/vm.scm
> @@ -104,7 +104,8 @@ the #:references-graphs parameter of 'derivation'."
> ;; hardware virtualization to still use these commands. KVM support is
> ;; still buggy on some ARM32 boards. Do not use it even if available.
> ,@(if (and (file-exists? "/dev/kvm")
> - (not target-arm32?))
> + (not target-arm32?)
> + (not (string-suffix? "-i386" qemu)))
> '("-enable-kvm")
> '())
>
> I suspect a KVM bug in Linux 4.17 though, because running the same
> ‘qemu-system-i386’ binary under strace works… Perhaps worth applying
> the patch above in the meantime, WDYT?
It would be better to auto-detect the presence of KVM support at run
time, but that's a wishlist item that deserves its own ticket. This is
good enough for now.
> Anyway, with this patch I successfully run:
>
> guix system vm-image gnu/system/examples/bare-bones.tmpl -s i686-linux
>
> and confirmed that the resulting image would boot through GRUB.
Sounds great, thanks again!
Mark