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Re: [Qemu-devel] [PATCH v4 3/3] i386: publish advised value of MSR_IA32_

From: Haozhong Zhang
Subject: Re: [Qemu-devel] [PATCH v4 3/3] i386: publish advised value of MSR_IA32_FEATURE_CONTROL via fw_cfg
Date: Mon, 20 Jun 2016 15:20:30 +0800
User-agent: Mutt/1.6.1-neo (2016-05-02)

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
> 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.


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