linux-kernel - [PATCH v4 0/5] KVM: Expose speculation control feature to guests

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Message-Id: <1517404231-22406-1-git-send-email-karahmed@amazon.de>
Date:   Wed, 31 Jan 2018 14:10:26 +0100
From:   KarimAllah Ahmed <karahmed@...zon.de>
To:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     KarimAllah Ahmed <karahmed@...zon.de>,
        Andi Kleen <ak@...ux.intel.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "H . Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Janakarajan Natarajan <Janakarajan.Natarajan@....com>,
        Joerg Roedel <joro@...tes.org>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Laura Abbott <labbott@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH v4 0/5] KVM: Expose speculation control feature to guests

Add direct access to speculation control MSRs for KVM guests. This allows the
guest to protect itself against Spectre V2 using IBRS+IBPB instead of a
retpoline+IBPB based approach.

It also exposes the ARCH_CAPABILITIES MSR which is going to be used by future
Intel processors to indicate RDCL_NO and IBRS_ALL.

v4:
- Add IBRS passthrough for SVM (5/5).
- Handle nested guests properly.
- expose F(IBRS) in kvm_cpuid_8000_0008_ebx_x86_features

Ashok Raj (1):
  KVM: x86: Add IBPB support

KarimAllah Ahmed (4):
  KVM: x86: Update the reverse_cpuid list to include CPUID_7_EDX
  KVM: VMX: Emulate MSR_IA32_ARCH_CAPABILITIES
  KVM: VMX: Allow direct access to MSR_IA32_SPEC_CTRL
  KVM: SVM: Allow direct access to MSR_IA32_SPEC_CTRL

 arch/x86/kvm/cpuid.c |  22 +++++++---
 arch/x86/kvm/cpuid.h |   1 +
 arch/x86/kvm/svm.c   |  85 ++++++++++++++++++++++++++++++++++++++
 arch/x86/kvm/vmx.c   | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 arch/x86/kvm/x86.c   |   1 +
 5 files changed, 216 insertions(+), 7 deletions(-)

Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Asit Mallick <asit.k.mallick@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: David Woodhouse <dwmw@...zon.co.uk>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Janakarajan Natarajan <Janakarajan.Natarajan@....com>
Cc: Joerg Roedel <joro@...tes.org>
Cc: Jun Nakajima <jun.nakajima@...el.com>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: x86@...nel.org

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