linux-kernel - Re: [PATCH v3 1/5] x86/paravirt: move some functions and defines to alternative

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 25 Oct 2023 12:34:02 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Juergen Gross <jgross@...e.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ajay Kaher <akaher@...are.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 1/5] x86/paravirt: move some functions and defines to
 alternative

On Thu, Oct 19, 2023 at 11:15:16AM +0200, Juergen Gross wrote:
> +/* Low-level backend functions usable from alternative code replacements. */
> +DEFINE_ASM_FUNC(x86_nop, "", .entry.text);
> +EXPORT_SYMBOL_GPL(x86_nop);

This is all x86 code so you don't really need the "x86_" prefix - "nop"
is perfectly fine.

> +noinstr void x86_BUG(void)
> +{
> +	BUG();
> +}
> +EXPORT_SYMBOL_GPL(x86_BUG);

That export is needed for?

Paravirt stuff in modules?

It builds here without it - I guess I need to do an allmodconfig.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette