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Re: [PATCH 4/5] x86/ucode: Cache results in microcode_scan_module()
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 28 Mar 2023 16:12:35 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
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On 28/03/2023 3:19 pm, Jan Beulich wrote:
> On 27.03.2023 21:41, Andrew Cooper wrote:
>> Right now, the boot flow depends on the second pass over
>> bootstrap_map()/find_cpio_data() altering ucode_blob.data to use the
>> directmap
>> alias of the CPIO module, where previously it caches the early boostrap
>> mapping.
>>
>> If the scan is successful, it will be successful the second time too, but
>> there's no point repeating the work. Cache the module index, offset and size
>> to short circuit things the second time around.
> If the scan failed, it will fail the 2nd time too. Maybe deal with
> this case as well, e.g. by clearing ucode_scan at the end of
> microcode_scan_module() when nothing was found?
See patch 5. It can only become true then because of how the callers
are arranged.
~Andrew
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