On 06/20/16 08:56, Paolo Bonzini wrote: > > > On 20/06/2016 05:09, Haozhong Zhang wrote: > > In the current nested VMX implementation in QEMU, setup > > MSR_IA32_FEATURE_CONTROL is left to guest. So I think, for LMCE which > > is another feature involving MSR_IA32_FEATURE_CONTROL, we may follow > > the existing code. > > > > Paolo and Radim, is there any case that objects to setting > > MSR_IA32_FEATURE_CONTROL in QEMU? > > If the SDM says that the reset state of the MSR is zero, QEMU should > initialize it to zero. >
Yes, SDM says "This MSR is cleared to zero when a logical processor is reset" (in section "Enabling and Entering VMX operation"), so we should do so in qemu as well. Thanks, Haozhong
