Re: [PATCH v4] KVM: x86: Add x2APIC "features" to control EOI broadcast suppression

[David Woodhouse]

On Thu, 2025-12-11 at 16:10 -0800, Sean Christopherson wrote:
> On Fri, Dec 12, 2025, David Woodhouse wrote:
> > On Thu, 2025-12-11 at 10:59 +0000, Khushit Shah wrote:
> > And my intent was that the in-kernel I/O APIC patch gets included as
> > *part* of this series, otherwise we're making a semantic change to the
> > ENABLE behaviour later.
> 
> Hmm, my only concern on that front is that we'd be backporting effectively new
> functionality to stable@ kernels that isn't strictly necessary.  But that's
> probably fine given that it requires userspace to opt-in.

Yeah. Arguably it's *all* a new capability and a 'new' (albeit 30 years
old!) feature.

I guess you could make an argument for *only* backporting the DISABLE
part to stable kernels and not the ENABLE part.... but don't :)

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