Re: gcc: error: unrecognized command-line option '-mharden-sls=all'

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On Thu, Apr 21, 2022 at 8:58 AM Sérgio Basto <sergio@xxxxxxxxxx> wrote:
>
> Hi,
>
> to test Virtualbox host kmods on new kernel (x86_64 only), I install
> fedora-rawhide-kernel-nodebug [1]
>
> but last two update I see with ack SLS [2] but SLS is strict arm thing
> , this is a bug ? or I'm missing something ?

SLS is not a strict arm thing, and upstream commit e463a09af2f06
brought in the Straight Line Speculation mitigations for x86. Those
are also enabled in 5.17 kernels as well.

I assume you are running the rawhide-nodebug kernel on rawhide? If so,
it should work, but it is entirely possible that the virtualbox
drivers just do not build against the 5.18 development kernels yet.
It would be best to ask them for support.  If you are trying to build
against the rawhide-nodebug kernel on a stable Fedora release, that
will not work. You would need to rebuild the kernel first..

Justin

> Thank you
>
> [2]
> .config
> 347:CONFIG_CC_HAS_SLS=y
> 348:CONFIG_SLS=y
>
> [1]
> dnf --disablerepo='*' --enablerepo=fedora-rawhide-kernel-nodebug update
>
>
> --
> Sérgio M. B.
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