[PATCH v3 0/4] KVM: Expose speculation control feature to guests

[KarimAllah Ahmed]

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.

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

KarimAllah Ahmed (3):
  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

 arch/x86/kvm/cpuid.c | 22 ++++++++++----
 arch/x86/kvm/cpuid.h |  1 +
 arch/x86/kvm/svm.c   | 14 +++++++++
 arch/x86/kvm/vmx.c   | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 arch/x86/kvm/x86.c   |  1 +
 5 files changed, 118 insertions(+), 6 deletions(-)

Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Ashok Raj <ashok.raj@xxxxxxxxx>
Cc: Asit Mallick <asit.k.mallick@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: David Woodhouse <dwmw@xxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Janakarajan Natarajan <Janakarajan.Natarajan@xxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: Jun Nakajima <jun.nakajima@xxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx

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2.7.4