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
