Re: [Xen-devel] [PATCH v1] x86/microcode: always collect_cpu_info() during boot

[Chao Gao <chao.gao@xxxxxxxxx>]

On Mon, Mar 25, 2019 at 11:12:17AM +0000, Sergey Dyasli wrote:
>Currently cpu_sig struct is not updated during boot when either:
>
>    1. ucode_scan is set to false (e.g. no "ucode=scan" in cmdline)
>    2. initrd does not contain a microcode blob
>
>These will result in cpu_sig.rev being 0 which affects APIC's
>check_deadline_errata() and retpoline_safe() functions.
>
>Fix this by getting ucode revision early during boot and SMP bring up.
>While at it, protect early_microcode_update_cpu() for cases when
>microcode_ops is NULL.
>
>Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>

Reviewed-by: Chao Gao <chao.gao@xxxxxxxxx>

Thanks
Chao

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