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From:   Xiaoyao Li <xiaoyao.li@linux.intel.com>
To:     kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
        =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@redhat.com>
Cc:     Xiaoyao Li <xiaoyao.li@linux.intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org,
        chao.gao@intel.com
Subject: [PATCH v2 0/2] Avoid cpuid faulting leaking and one optimization
Date:   Mon, 18 Mar 2019 19:43:22 +0800
Message-Id: <20190318114324.14198-1-xiaoyao.li@linux.intel.com>
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Sender: linux-kernel-owner@vger.kernel.org
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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