Messages in this thread | | | From | KarimAllah Ahmed <> | Subject | [PATCH v5 0/5] KVM: Expose speculation control feature to guests | Date | Wed, 31 Jan 2018 20:37:42 +0100 |
| |
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.
v5: - svm: add PRED_CMD and SPEC_CTRL to direct_access_msrs list. - vmx: check also for X86_FEATURE_SPEC_CTRL for msr reads and writes. - vmx: Use MSR_TYPE_W instead of MSR_TYPE_R for the nested IBPB MSR - rewrite commit message for IBPB patch [2/5] (Ashok)
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 | 87 ++++++++++++++++++++++++++++++++++++++ arch/x86/kvm/vmx.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++++-- arch/x86/kvm/x86.c | 1 + 5 files changed, 218 insertions(+), 10 deletions(-)
Cc: Andi Kleen <ak@linux.intel.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Ashok Raj <ashok.raj@intel.com> Cc: Asit Mallick <asit.k.mallick@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: David Woodhouse <dwmw@amazon.co.uk> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Jun Nakajima <jun.nakajima@intel.com> Cc: Laura Abbott <labbott@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: x86@kernel.org
-- 2.7.4
| |