linux-kernel - [PATCH v2 0/2] x86/cpu, kvm: Support AMD Automatic IBRS

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-next>] [day] [month] [year] [list]

Message-ID: <20221124000449.79014-1-kim.phillips@amd.com>
Date:   Wed, 23 Nov 2022 18:04:47 -0600
From:   Kim Phillips <kim.phillips@....com>
To:     <x86@...nel.org>
CC:     Kim Phillips <kim.phillips@....com>,
        Babu Moger <Babu.Moger@....com>,
        Borislav Petkov <bp@...en8.de>, Borislav Petkov <bp@...e.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Jonathan Corbet <corbet@....net>,
        "Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tony Luck <tony.luck@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>, <kvm@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 0/2] x86/cpu, kvm: Support AMD Automatic IBRS

The AMD Zen4 core supports a new feature called Automatic IBRS
(Indirect Branch Restricted Speculation).

Enable Automatic IBRS by default if the CPU feature is present.
It typically provides greater performance over the incumbent
generic retpolines mitigation.

Patch 1 adds support for AutoIBRS and other feature
bits in the CPUID_8000_0021_EAX leaf.

Patch 2 adds support for AMD Automatic IBRS

Co-developed-by: Babu Moger <Babu.Moger@....com>
Co-developed-by: Borislav Petkov <bp@...en8.de>
Signed-off-by: Kim Phillips <kim.phillips@....com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Joao Martins <joao.m.martins@...cle.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Sean Christopherson <seanjc@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Juergen Gross <jgross@...e.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: kvm@...r.kernel.org
Cc: linux-doc@...r.kernel.org
Cc: x86@...nel.org
Cc: linux-kernel@...r.kernel.org

Kim Phillips (2):
  x86/cpu, kvm: Use CPU capabilities for CPUID[0x80000021].EAX
  x86/cpu, kvm: Support AMD Automatic IBRS

 .../admin-guide/kernel-parameters.txt         |  9 +++--
 arch/x86/include/asm/cpufeatures.h            |  5 +--
 arch/x86/include/asm/msr-index.h              |  2 ++
 arch/x86/kernel/cpu/bugs.c                    | 23 +++++++-----
 arch/x86/kernel/cpu/common.c                  |  8 +++++
 arch/x86/kernel/cpu/scattered.c               |  4 +++
 arch/x86/kvm/cpuid.c                          | 35 +++++++++++--------
 arch/x86/kvm/reverse_cpuid.h                  | 24 +++++++++----
 arch/x86/kvm/svm/svm.c                        |  3 ++
 arch/x86/kvm/x86.c                            |  3 ++
 10 files changed, 82 insertions(+), 34 deletions(-)

-- 
2.34.1