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

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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