Re: [Xen-devel] [PATCH 6/7] x86/ucode/intel: Clean up microcode_sanity_check()

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 25/03/2020 14:07, Jan Beulich wrote:
>> Introduce a check missing from the old code, that total_size is a multiple of
>> 1024 bytes,
> Where is this documented? The rather brief section in SDM vol 3 doesn't
> mention anything like this.

It is in the middle of the final paragraph of 9.11.1 Microcode Update,
immediately preceding Table 9-7

"The total size field of the microcode update header specifies the
encrypted data size plus the header size; its value must be in multiples
of 1024 bytes (1 KBytes)."

~Andrew

(I've lost count of how many times I've read this chapter over the
course of developing this series...)