linux-kernel - Re: [PATCH 7/9] x86/hyperv: Initialize cpu and memory for SEV-SNP enlightened guest

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Message-ID: <20230609095645.GA21469@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date:   Fri, 9 Jun 2023 02:56:45 -0700
From:   Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
Cc:     Tianyu Lan <ltykernel@...il.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>,
        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 7/9] x86/hyperv: Initialize cpu and memory for SEV-SNP
 enlightened guest

On Thu, Jun 08, 2023 at 01:51:35PM +0000, Michael Kelley (LINUX) wrote:
> From: Tianyu Lan <ltykernel@...il.com> Sent: Thursday, June 1, 2023 8:16 AM
> > 
> > Hyper-V enlightened guest doesn't have boot loader support.
> > Boot Linux kernel directly from hypervisor with data(kernel
> 
> Add a space between "data" and "(kernel"
> 
> > image, initrd and parameter page) and memory for boot up that
> > is initialized via AMD SEV PSP proctol LAUNCH_UPDATE_DATA
> 
> s/proctol/protocol/
> 
> > (Please refernce https://www.amd.com/system/files/TechDocs/55766_SEV-KM_API_Specification.pdf 1.3.1 Launch).
> 
> s/refernce/reference/
> 
> And the link above didn't work for me -- the "55766_SEV-KM_API_Specification.pdf"
> part was separated from the rest of the URL, though it's possible the mangling
> was done by Microsoft's email system.  Please double check that the URL is
> correctly formatted with no spurious spaces.
> 
> Even better, maybe write this as:
> 
> Please reference Section 1.3.1 "Launch" of [1].
> 
> Then put the full link as [1] at the bottom of the commit message.
> 

Tianyu: that document is SEV specific, and does not have the parts that SEV-SNP
uses. For SNP this is the firmware ABI:

https://www.amd.com/system/files/TechDocs/56860.pdf

and the API I think you mean is SNP_LAUNCH_UPDATE.

It would also help to mention that the data at EN_SEV_SNP_PROCESSOR_INFO_ADDR
is loaded as PAGE_TYPE_UNMEASURED.

Thanks,
Jeremi