linux-kernel - [PATCH v2 0/2] Avoid cpuid faulting leaking and one optimization

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Message-Id: <20190318114324.14198-1-xiaoyao.li@linux.intel.com>
Date:   Mon, 18 Mar 2019 19:43:22 +0800
From:   Xiaoyao Li <xiaoyao.li@...ux.intel.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>
Cc:     Xiaoyao Li <xiaoyao.li@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        chao.gao@...el.com
Subject: [PATCH v2 0/2] Avoid cpuid faulting leaking and one optimization

This series avoid cpuid faulting of host leakding to guest, which may
potentially cause guest boot failure, and use hardware cpuid faulting
to remove emulation overhead.

Patch 1 avoids cpuid faulting leaking to guest through clearing cpuid faulting
bit before enter guest and restoring host's cpuid faulting bit when switch
to host.

Patch 2 enables hardware cpuid faulting for guest if it exists, to avoid
the emulation overhead.

==changelog==
v2:
- move the save/restore of cpuid faulting bit to
vmx_prepare_swich_to_guest/vmx_prepare_swich_to_host to avoid every
vmentry RDMSR, based on Paolo's comment.

==previous version==
v1: https://patchwork.kernel.org/patch/10852253/

Xiaoyao Li (2):
  kvm/vmx: avoid CPUID faulting leaking to guest
  kvm/vmx: Using hardware cpuid faulting to avoid emulation overhead

 arch/x86/include/asm/kvm_host.h |  2 ++
 arch/x86/kvm/vmx/vmx.c          | 45 +++++++++++++++++++++++++++++++++
 arch/x86/kvm/vmx/vmx.h          |  2 ++
 arch/x86/kvm/x86.c              | 15 ++++++++---
 4 files changed, 61 insertions(+), 3 deletions(-)

-- 
2.19.1