linux-kernel - Re: [RFC PATCH v2 09/11] KVM: VMX: Advertise MITI_CTRL_BHB_CLEAR_SEQ_S

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Message-ID: <0498b338-45c6-41f2-6243-3eed3e2d46d3@intel.com>
Date:   Mon, 22 May 2023 17:41:26 +0800
From:   "Liu, Jingqi" <jingqi.liu@...el.com>
To:     Chao Gao <chao.gao@...el.com>, <kvm@...r.kernel.org>
CC:     Jiaan Lu <jiaan.lu@...el.com>, Zhang Chen <chen.zhang@...el.com>,
        "Sean Christopherson" <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 09/11] KVM: VMX: Advertise
 MITI_CTRL_BHB_CLEAR_SEQ_S_SUPPORT


On 4/14/2023 2:25 PM, Chao Gao wrote:
> From: Zhang Chen <chen.zhang@...el.com>
>
> Allow guest to query if the underying VMM understands BHB-clearing
> sequence and report the statue of BHB-clearing sequence in suprevisor
s/statue/status
> mode i.e. CPL < 3 via MSR_VIRTUAL_MITIGATION_ENUM/CTRL.
>
> Enable BHI_DIS_S for guest if guest is using BHI-clearing sequence and
> the sequence isn't effective on the processor.
>
> Signed-off-by: Zhang Chen <chen.zhang@...el.com>
> Signed-off-by: Chao Gao <chao.gao@...el.com>
> Tested-by: Jiaan Lu <jiaan.lu@...el.com>
> ---
Thanks,
Jingqi