Re: [RFC PATCH V4 08/17] x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest

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To: "Michael Kelley (LINUX)" <mikelley@xxxxxxxxxxxxx>, "luto@xxxxxxxxxx" <luto@xxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "bp@xxxxxxxxx" <bp@xxxxxxxxx>, "dave.hansen@xxxxxxxxxxxxxxx" <dave.hansen@xxxxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "seanjc@xxxxxxxxxx" <seanjc@xxxxxxxxxx>, "pbonzini@xxxxxxxxxx" <pbonzini@xxxxxxxxxx>, "jgross@xxxxxxxx" <jgross@xxxxxxxx>, Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>, "kirill@xxxxxxxxxxxxx" <kirill@xxxxxxxxxxxxx>, "jiangshan.ljs@xxxxxxxxxxxx" <jiangshan.ljs@xxxxxxxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "ashish.kalra@xxxxxxx" <ashish.kalra@xxxxxxx>, "srutherford@xxxxxxxxxx" <srutherford@xxxxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, "anshuman.khandual@xxxxxxx" <anshuman.khandual@xxxxxxx>, "pawan.kumar.gupta@xxxxxxxxxxxxxxx" <pawan.kumar.gupta@xxxxxxxxxxxxxxx>, "adrian.hunter@xxxxxxxxx" <adrian.hunter@xxxxxxxxx>, "daniel.sneddon@xxxxxxxxxxxxxxx" <daniel.sneddon@xxxxxxxxxxxxxxx>, "alexander.shishkin@xxxxxxxxxxxxxxx" <alexander.shishkin@xxxxxxxxxxxxxxx>, "sandipan.das@xxxxxxx" <sandipan.das@xxxxxxx>, "ray.huang@xxxxxxx" <ray.huang@xxxxxxx>, "brijesh.singh@xxxxxxx" <brijesh.singh@xxxxxxx>, "michael.roth@xxxxxxx" <michael.roth@xxxxxxx>, "thomas.lendacky@xxxxxxx" <thomas.lendacky@xxxxxxx>, "venu.busireddy@xxxxxxxxxx" <venu.busireddy@xxxxxxxxxx>, "sterritt@xxxxxxxxxx" <sterritt@xxxxxxxxxx>, "tony.luck@xxxxxxxxx" <tony.luck@xxxxxxxxx>, "samitolvanen@xxxxxxxxxx" <samitolvanen@xxxxxxxxxx>, "fenghua.yu@xxxxxxxxx" <fenghua.yu@xxxxxxxxx>
Subject: Re: [RFC PATCH V4 08/17] x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest
From: Tianyu Lan <ltykernel@xxxxxxxxx>
Date: Sun, 16 Apr 2023 15:21:23 +0800
Cc: "pangupta@xxxxxxx" <pangupta@xxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "linux-hyperv@xxxxxxxxxxxxxxx" <linux-hyperv@xxxxxxxxxxxxxxx>, "linux-arch@xxxxxxxxxxxxxxx" <linux-arch@xxxxxxxxxxxxxxx>
In-reply-to: <BYAPR21MB1688DB1442B486A8DEBEF821D79B9@BYAPR21MB1688.namprd21.prod.outlook.com>
References: <20230403174406.4180472-1-ltykernel@gmail.com> <20230403174406.4180472-9-ltykernel@gmail.com> <BYAPR21MB1688DB1442B486A8DEBEF821D79B9@BYAPR21MB1688.namprd21.prod.outlook.com>
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On 4/12/2023 10:39 PM, Michael Kelley (LINUX) wrote:

+	/* Read processor number and memory layout. */
+	processor_count = *(u32 *)__va(EN_SEV_SNP_PROCESSOR_INFO_ADDR);
+	entry = (struct memory_map_entry *)(__va(EN_SEV_SNP_PROCESSOR_INFO_ADDR)
+			+ sizeof(struct memory_map_entry));

Why is the first map entry being skipped?


The first entry is populated with processor count by Hyper-V.

Follow-Ups:
- RE: [RFC PATCH V4 08/17] x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest
  - From: Michael Kelley (LINUX)

References:
- [RFC PATCH V4 00/17] x86/hyperv/sev: Add AMD sev-snp enlightened guest support on hyperv
  - From: Tianyu Lan
- [RFC PATCH V4 08/17] x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest
  - From: Tianyu Lan
- RE: [RFC PATCH V4 08/17] x86/hyperv: Initialize cpu and memory for sev-snp enlightened guest
  - From: Michael Kelley (LINUX)

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