[Xen-devel] Re: [PATCH 0/2] x86/microcode: support for microcode update in Xen dom0

[Borislav Petkov <bp@xxxxxxxxx>]

On Wed, Feb 02, 2011 at 11:52:22AM -0800, H. Peter Anvin wrote:
> 3. Arguably on native hardware we should still load the microcode into
> RAM in the boot loader, and install it on the very early CPU bringup
> path.  That means locking down some (currently) 400K of RAM to handle
> different combinations of CPUs, or the additional complexity of
> jettisoning microcode which cannot be used while still be able to deal
> with hotplug.  I think there is a strong case for this model, which
> would mean moving the microcode into /boot anyway.

/me like it, sounds very nifty. So how do we want to do that, we add
a field to the real-mode kernel header that tells us where to find
the microcode image and we take it and apply the ucode somewhere in
do_boot_cpu() path?

-- 
Regards/Gruss,
    Boris.

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