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: <CAMvTesC42Rf=r6fsi6PVB+WgtRxWOXSeTY7RvyHZizFJkDRSyg@mail.gmail.com>
Date:   Sun, 16 Apr 2023 15:23:33 +0800
From:   sky free <ltykernel@...il.com>
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Subject: Re: [RFC PATCH V4 08/17] x86/hyperv: Initialize cpu and memory for
 sev-snp enlightened guest

On 4/12/2023 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.