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Message-ID: <ae2d45da-b0c7-5d2a-8532-3562c31ca820@gmail.com>
Date:   Thu, 8 Jun 2023 21:21:43 +0800
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Subject: Re: [PATCH 2/9] x86/hyperv: Set Virtual Trust Level in VMBus init
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To:     "Michael Kelley (LINUX)" <mikelley@microsoft.com>,
        KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        "wei.liu@kernel.org" <wei.liu@kernel.org>,
        Dexuan Cui <decui@microsoft.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "bp@alien8.de" <bp@alien8.de>,
        "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
        "x86@kernel.org" <x86@kernel.org>, "hpa@zytor.com" <hpa@zytor.com>,
        "daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org>,
        "arnd@arndb.de" <arnd@arndb.de>
Cc:     Tianyu Lan <Tianyu.Lan@microsoft.com>,
        "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "vkuznets@redhat.com" <vkuznets@redhat.com>
References: <20230601151624.1757616-1-ltykernel@gmail.com>
 <20230601151624.1757616-3-ltykernel@gmail.com>
 <BYAPR21MB1688903C92A708680FFE7B91D750A@BYAPR21MB1688.namprd21.prod.outlook.com>
From:   Tianyu Lan <ltykernel@gmail.com>
In-Reply-To: <BYAPR21MB1688903C92A708680FFE7B91D750A@BYAPR21MB1688.namprd21.prod.outlook.com>
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On 6/8/2023 9:06 PM, Michael Kelley (LINUX) wrote:
> From: Tianyu Lan<ltykernel@gmail.com>  Sent: Thursday, June 1, 2023 8:16 AM
>> SEV-SNP guest provides vtl(Virtual Trust Level) and
>> get it from Hyper-V hvcall via register hvcall HVCALL_
>> GET_VP_REGISTERS.
>>
>> During initialization of VMBus, vtl needs to be set in the
>> VMBus init message.
> Let's clean up this commit message a bit.  I would suggest:
> 
> SEV-SNP guests on Hyper-V can run at multiple Virtual Trust
> Levels (VTL).  During boot, get the VTL at which we're running
> using the GET_VP_REGISTERs hypercall, and save the value
> for future use.  Then during VMBus initialization, set the VTL
> with the saved value as required in the VMBus init message.
> 

Will update. Thanks to rework change log.