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Date:   Mon, 31 Aug 2020 11:15:50 +0800
From:   Chenyi Qiang <>
To:     Jim Mattson <>
Cc:     Paolo Bonzini <>,
        Sean Christopherson <>,
        Vitaly Kuznetsov <>,
        Wanpeng Li <>,
        Joerg Roedel <>,
        Xiaoyao Li <>,
        kvm list <>,
        LKML <>
Subject: Re: [PATCH 2/5] KVM: nVMX: Verify the VMX controls MSRs with the
 global capability when setting VMX MSRs

On 8/29/2020 2:23 AM, Jim Mattson wrote:
> On Fri, Aug 28, 2020 at 1:54 AM Chenyi Qiang <> wrote:
>> When setting the nested VMX MSRs, verify it with the values in
>> vmcs_config.nested_vmx_msrs, which reflects the global capability of
>> VMX controls MSRs.
>> Signed-off-by: Chenyi Qiang <>
> You seem to have entirely missed the point of this code, which is to
> prevent userspace from adding features that have previously been
> removed for this vCPU (e.g as a side-effect of KVM_SET_CPUID).

We only have the case that the scope of features set by userspace is 
always reduced, right? If so, we don't need the change here.

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