Re: [Xen-devel] [PATCH] x86/ucode: Improve error handling and container file processing on AMD

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.12.12 at 16:25, Boris Ostrovsky <boris.ostrovsky@xxxxxxx> wrote:
> On 12/07/2012 10:08 AM, Jan Beulich wrote:
>>>>> On 07.12.12 at 14:46, Boris Ostrovsky <boris.ostrovsky@xxxxxxx> wrote:
>>> Do we really need what microcode_init() does?
>>
>> Oh yes, absolutely. How else would boot time microcode loading
>> work for secondary CPUs without this? Note that the notifier only
>> deals with the CPU_DEAD case.
> 
> start_secondary() -> microcode_resume_cpu() -> 
> microcode_ops->apply_microcode() will update non-boot CPUs in most cases.
> 
> This won't quite work when secondary CPU is different from (or at 
> different patch level than) boot CPU but that can be fixed.

Exactly. And I don't believe it can be done differently as easily as
you seem to think.

Jan


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