linux-kernel - Re: [PATCH 3/4] x86/mce: Get rid of msr

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, 22 Sep 2021 14:16:49 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Luck, Tony" <tony.luck@...el.com>
Cc:     Yazen Ghannam <Yazen.Ghannam@....com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] x86/mce: Get rid of msr_ops

On Mon, Sep 20, 2021 at 10:32:11AM +0200, Borislav Petkov wrote:
> but please don't make me add more helper functions. Those MSR defines
> already have "SMCA" and "IA32" in their names so that should be a good
> enough differentiation, I'd say.

I just had a better idea - it is compact but regular and one can see at
a quick glance which block is for which set of MSRs:

u32 mca_msr_reg(int bank, enum mca_msr reg)
{
        if (mce_flags.smca) {
                switch (reg) {
                case MCA_CTL:    return MSR_AMD64_SMCA_MCx_CTL(bank);    break;
                case MCA_ADDR:   return MSR_AMD64_SMCA_MCx_ADDR(bank);   break;
                case MCA_MISC:   return MSR_AMD64_SMCA_MCx_MISC(bank);   break;
                case MCA_STATUS: return MSR_AMD64_SMCA_MCx_STATUS(bank); break;
                default: goto out; break;
                }
        }

        switch (reg) {
        case MCA_CTL:    return MSR_IA32_MCx_CTL(bank);    break;
        case MCA_ADDR:   return MSR_IA32_MCx_ADDR(bank);   break;
        case MCA_MISC:   return MSR_IA32_MCx_MISC(bank);   break;
        case MCA_STATUS: return MSR_IA32_MCx_STATUS(bank); break;
        default: goto out; break;
        }

out:
        WARN_ON_ONCE(1);
        return 0;
}

-- 
Regards/Gruss,
    Boris.

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