Re: [PATCH v3] KVM: x86: Add x2APIC "features" to control EOI broadcast suppression

[David Woodhouse]

On Wed, 2025-12-03 at 00:50 +0000, Huang, Kai wrote:
> 
> Since it's uAPI, are we expecting the two flags to have impact on in-kernel
> ioapic?
> 
> I think there should no harm to make the two also apply to in-kernel ioapic.
> 
> E.g., for now we can reject KVM_X2APIC_ENABLE_SUPPRESS_EOI_BROADCAST flag for
> in-kernel ioapic.  In the future, we might add EOI register support to in-kernel
> ioapic and report supporting suppress EOI broadcast, then we can in-kernel
> ioapic to honor these two flags too.

The simplest option is probably to fix the in-kernel I/O APIC at the
same time, bumping the version to 0x20 and adding support for the EOI
register in the KVM_SUPPRESS_EOI_ENABLED case.

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