linux-kernel - Re: [PATCH 2/9] x86/hyperv: Set Virtual Trust Level in VMBus init message

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Message-ID: <ae2d45da-b0c7-5d2a-8532-3562c31ca820@gmail.com>
Date:   Thu, 8 Jun 2023 21:21:43 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "arnd@...db.de" <arnd@...db.de>
Cc:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>
Subject: Re: [PATCH 2/9] x86/hyperv: Set Virtual Trust Level in VMBus init
 message



On 6/8/2023 9:06 PM, Michael Kelley (LINUX) wrote:
> From: Tianyu Lan<ltykernel@...il.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.