On 27.09.2019 18:12, Chao Gao wrote:
> @@ -105,23 +110,40 @@ void __init microcode_set_module(unsigned int idx)
> }
>
> /*
> - * The format is '[|scan]'. Both options are optional.
> - * If the EFI has forced which of the multiboot payloads is to be used,
> - * no parsing will be attempted.
>
When one core is loading ucode, handling NMI on sibling threads or
on other cores in the system might be problematic. By rendezvousing
all CPUs in NMI handler, it prevents NMI acceptance during ucode
loading.
Basically, some work previously done in stop_machine context is
moved to NMI handler.
