From: Chenyi Qiang <chenyi.qiang@intel.com>
To: Jim Mattson <jmattson@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Joerg Roedel <joro@8bytes.org>, Xiaoyao Li <xiaoyao.li@intel.com>,
kvm list <kvm@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 2/5] KVM: nVMX: Verify the VMX controls MSRs with the global capability when setting VMX MSRs
Date: Mon, 31 Aug 2020 11:15:50 +0800 [thread overview]
Message-ID: <d80093d9-3368-adc7-050c-75686cd261ec@intel.com> (raw)
In-Reply-To: <CALMp9eTDTeKQrCnYsSsMPF3-0N=GW7QPOQY8xg4oiCcmv8hgYA@mail.gmail.com>
On 8/29/2020 2:23 AM, Jim Mattson wrote:
> On Fri, Aug 28, 2020 at 1:54 AM Chenyi Qiang <chenyi.qiang@intel.com> 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 <chenyi.qiang@intel.com>
>
> 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.
next prev parent reply other threads:[~2020-08-31 3:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-28 8:56 [PATCH 0/5] Fix nested VMX controls MSRs Chenyi Qiang
2020-08-28 8:56 ` [PATCH 1/5] KVM: nVMX: Fix VMX controls MSRs setup when nested VMX enabled Chenyi Qiang
2020-08-28 17:43 ` Jim Mattson
2020-08-29 1:49 ` Chenyi Qiang
2020-08-29 2:51 ` Xiaoyao Li
2020-08-31 17:36 ` Jim Mattson
2020-09-01 3:27 ` Xiaoyao Li
2020-08-28 8:56 ` [PATCH 2/5] KVM: nVMX: Verify the VMX controls MSRs with the global capability when setting VMX MSRs Chenyi Qiang
2020-08-28 18:23 ` Jim Mattson
2020-08-31 3:15 ` Chenyi Qiang [this message]
2020-08-28 8:56 ` [PATCH 3/5] KVM: nVMX: Update VMX controls MSR according to guest CPUID after " Chenyi Qiang
2020-08-28 20:39 ` Jim Mattson
2020-09-02 18:16 ` Sean Christopherson
2020-09-02 18:32 ` Jim Mattson
2020-09-11 17:09 ` Paolo Bonzini
2020-08-28 8:56 ` [PATCH 4/5] KVM: nVMX: Fix the update value of nested load IA32_PERF_GLOBAL_CTRL control Chenyi Qiang
2020-08-28 18:29 ` Jim Mattson
2020-08-28 8:56 ` [PATCH 5/5] KVM: nVMX: Simplify the initialization of nested_vmx_msrs Chenyi Qiang
2020-09-11 17:11 ` [PATCH 0/5] Fix nested VMX controls MSRs Paolo Bonzini
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