linux-kernel - Re: [PATCH v9 23/43] KVM: x86: Move lookup of indexed CPUID leafs to helper

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]

Message-ID: <Yfvx0Rq8Tydyr/RO@zn.tnic>
Date:   Thu, 3 Feb 2022 16:16:33 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andi Kleen <ak@...ux.intel.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        brijesh.ksingh@...il.com, tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        Venu Busireddy <venu.busireddy@...cle.com>
Subject: Re: [PATCH v9 23/43] KVM: x86: Move lookup of indexed CPUID leafs to
 helper

On Fri, Jan 28, 2022 at 11:17:44AM -0600, Brijesh Singh wrote:
> From: Michael Roth <michael.roth@....com>
> 
> Determining which CPUID leafs have significant ECX/index values is
> also needed by guest kernel code when doing SEV-SNP-validated CPUID
> lookups. Move this to common code to keep future updates in sync.
> 
> Reviewed-by: Venu Busireddy <venu.busireddy@...cle.com>
> Signed-off-by: Michael Roth <michael.roth@....com>
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
>  arch/x86/include/asm/cpuid.h | 38 ++++++++++++++++++++++++++++++++++++
>  arch/x86/kvm/cpuid.c         | 19 ++----------------
>  2 files changed, 40 insertions(+), 17 deletions(-)
>  create mode 100644 arch/x86/include/asm/cpuid.h
> 
> diff --git a/arch/x86/include/asm/cpuid.h b/arch/x86/include/asm/cpuid.h
> new file mode 100644
> index 000000000000..00408aded67c
> --- /dev/null
> +++ b/arch/x86/include/asm/cpuid.h
> @@ -0,0 +1,38 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Kernel-based Virtual Machine driver for Linux cpuid support routines
> + *
> + * derived from arch/x86/kvm/x86.c
> + * derived from arch/x86/kvm/cpuid.c
> + *
> + * Copyright 2011 Red Hat, Inc. and/or its affiliates.
> + * Copyright IBM Corporation, 2008
> + */

I have no clue what you're trying to achieve by copying the copyright of
the file this comes from. As dhansen properly points out, those lines
in that function come from other folks/companies too so why even bother
with this?

git history holds the correct and full copyright anyway...

-- 
Regards/Gruss,
    Boris.

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