Re: [Xen-devel] [PATCH] x86/microcode: Support builtin CPU microcode

[Eslam Elnikety <elnikety@xxxxxxxxxx>]

On 13.12.19 14:57, Andrew Cooper wrote:
> On 12/12/2019 22:13, Eslam Elnikety wrote:
> > > > Second, there is often need to couple a Xen build with a minimum
> > > > microcode patch level. Having the microcode built within the Xen image
> > > > itself is a streamlined, natural way of achieving that.
> > > Okay, I can accept this as a reason, to some degree at least. Yet
> > > as said elsewhere, I don't think you want then to override a
> > > possible "external" ucode module with the builtin blobs. Instead
> > > the newest of everything that's available should then be loaded.
> > Extending Xen to work around tools shortcomings is absolutely not what
> > I have in mind. I should have started with the second reason. Read
> > this as: Xen relies on a minimum microcode feature set, and it makes
> > sense to couple both in one binary. This coupling just happens to
> > provide an added benefit in the face of tools shortcoming.
> Do we have anything which strictly relies on a minimum version?
I had in mind microcode speculation mitigation features when reasoning 
with the minimum patch level argument.
-- Eslam

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