** Changed in: intel
Status: New => Fix Released
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[Feature] Early load microcode for x86 CPU
Status in intel:
Status in linux package in Ubuntu:
Status in linux source package in Utopic:
The problem in current microcode loading method is that we load a
microcode way too late; ideally we should load it before turning
paging on. This may only be practical on 32 bits since we can't get
to 64-bit mode without paging on,but we should still do it as early as
at all possible.
Similarly, we should load the microcode update as early as possible
during AP bringup and when processors are brought back online after
hotplug or S3/S4.
In order to do that, the microcode patch needs to be permanently
present in kernel memory. Each individual patch is fairly small, so
that is OK, but the entire blob with support for each CPU is too big.
Since only CPU's with same model can be in the same platform, we store
microcode with the same model as BSP. Later on AP's can upload
microcode from the saved microcodep patches.
Note, however, that Linux users have gotten used to being able to
install a microcode patch in the field without having a reboot; we
support that model too.
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