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

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Message-ID: <2c3b4042-c9ef-5b69-34b5-9ee7f418d983@gmail.com>
Date:   Tue, 18 Apr 2023 22:12:56 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
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        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "jgross@...e.com" <jgross@...e.com>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
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Cc:     "pangupta@....com" <pangupta@....com>,
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Subject: Re: [RFC PATCH V4 08/17] x86/hyperv: Initialize cpu and memory for
 sev-snp enlightened guest



On 4/17/2023 8:49 PM, Michael Kelley (LINUX) wrote:
>>> Why is the first map entry being skipped?
>> The first entry is populated with processor count by Hyper-V.
> Perhaps add a comment to acknowledge that the behavior
> is a bit unexpected:
> 
> The 0th entry in the memory layout array contains just a 32-bit
> processor count.  Read that value and then skip over the reminder
> of the 0th entry.  Start processing memory_map_entry's with array
> element 1.
> 

Good suggestion! Will update in the next version.