Re: [RFC 05/10] x86/speculation: Add basic IBRS support infrastructure

[Woodhouse, David]

On Mon, 2018-01-22 at 14:30 +0100, Greg Kroah-Hartman wrote:
> We kind of do, you can submit patches to UEFI, but I doubt that the
> processor-specific portions are actually present in the Tianocore code
> to be able to be patched.

This is just about which microcode your BIOS loads into the CPU before
booting the OS. It's not "process-specific portions in the Tianocore
code"; more a data blob â just like when Linux updates microcode.

> What about LinuxBoot <https://linuxboot.org>, does it too take over too
> late in the boot process to control this?

Yes, I believe microcode updates are done in PEI which is before
LinuxBoot takes over.

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