linux-kernel - Re: [PATCH v3 07/15] KVM: nVMX: Use KVM-governed feature framework to track "nested VMX enabled"

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Date:   Wed, 16 Aug 2023 02:25:19 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "Zeng, Guang" <guang.zeng@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Yao, Yuan" <yuan.yao@...el.com>
Subject: Re: [PATCH v3 07/15] KVM: nVMX: Use KVM-governed feature framework to
 track "nested VMX enabled"

On Tue, 2023-08-15 at 13:36 -0700, Sean Christopherson wrote:
> Track "VMX exposed to L1" via a governed feature flag instead of using a
> dedicated helper to provide the same functionality.  The main goal is to
> drive convergence between VMX and SVM with respect to querying features
> that are controllable via module param (SVM likes to cache nested
> features), avoiding the guest CPUID lookups at runtime is just a bonus
> and unlikely to provide any meaningful performance benefits.
> 
> No functional change intended.
> 
> Reviewed-by: Yuan Yao <yuan.yao@...el.com>
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>

Reviwed-by: Kai Huang <kai.huang@...el.com>