I'm queueing patches 1-5 on x86-next. On Tue, Jan 09, 2018 at 01:45:12PM -0200, Eduardo Habkost wrote: > This series adds support for the new IA32_SPEC_CTRL MSR on Intel > CPU models. The new MSR and the spec-ctrl CPUID bit > (CPUID[EAX=7,ECX=0].EDX[bit 26]) were introduced by a recent > Intel microcode updated and can be used by OSes to mitigate > CVE-2017-5715. > > It also adds a new EPYC-IBPB CPU model that includes > CPUID[0x80000008].EBX[bit 12] (IBPB). That patch is a RFC > because I couldn't find any detailed info on the new CPUID bit > and the IA32_PRED_CMD MSR. > > Additionally, the last patch on this series changes the new > Westmere-IBRS, SandyBridge-IBRS and IvyBridge-IBRS to include the > PCID feature, because PCID helps to reduce the performance impact > of KPTI on the guest. The patch is also a RFC because we need to > confirm if all Westmere (and newer) CPUs out there have PCID > available. > > References: > * https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5715 > * Google Security Blog on Meltdown/Spectre mitigations: > > https://security.googleblog.com/2018/01/more-details-about-mitigations-for-cpu_4.html > * Kernel patches to make use of the new MSRs: > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1578798.html > * KVM kernel patches for the new CPUID bits and MSRs: > https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1580363.html > * Patches adding PCID to the existing CPU models: > https://patchew.org/QEMU/20180108205052.24385-1-vinc...@bernat.im > https://patchew.org/QEMU/20180109070112.30806-1-vinc...@bernat.im > > Eduardo Habkost (6): > i386: Change X86CPUDefinition::model_id to const char* > i386: Add spec-ctrl CPUID bit > i386: Add FEAT_8000_0008_EBX CPUID feature word > i386: Add new -IBRS versions of Intel CPU models > [RFC] i386: Add EPYC-IBPB CPU model > [RFC] i386: Add PCID to {Westmere,SandyBridge,IvyBridge}-IBRS > > Paolo Bonzini (1): > i386: Add support for SPEC_CTRL MSR > > target/i386/cpu.h | 7 + > target/i386/cpu.c | 454 > +++++++++++++++++++++++++++++++++++++++++++++++++- > target/i386/kvm.c | 14 ++ > target/i386/machine.c | 20 +++ > 4 files changed, 491 insertions(+), 4 deletions(-) > > -- > 2.14.3 > >
-- Eduardo
