Re: microcode updates and spectre variant 2

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On Tue, Jan 16, 2018 at 03:42:42PM -0500, Josh Boyer wrote:
> On Tue, Jan 16, 2018 at 3:36 PM, Zbigniew Jędrzejewski-Szmek
> <zbyszek@xxxxxxxxx> wrote:
> > On Tue, Jan 16, 2018 at 06:54:36AM -0500, Josh Boyer wrote:
> >> On Mon, Jan 15, 2018 at 12:58 PM, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote:
> >> > If microcode is updated, but the initramfs isn't regenerated, so the
> >> > newer microcode get loaded later in the boot process once available?
> >> > Or does it have to be in the initramfs?
> >>
> >> I can't remember if systemd does this now by default or not.  The best
> >> option is to regen the initramfs.
> >
> > systemd does not regenerate the initramfs, and never did. I think this is
> > only done automatically upon kernel upgrade.
> 
> Sorry, I was unclear.  I meant I don't know if systemd has a service
> to reload microcode later during the boot.

Oh, afaik it has to be loaded very early. early-microcode cpio image is
generated and used when the kernel is starting. I don't think we can
load microcode later.

Zbyszek
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