Re: [PATCH v2 3/3] KVM: X86: Let's harden the ipi fastpath condition edge-trigger mode

[Paolo Bonzini]

On 08/06/21 18:35, Sean Christopherson wrote:
> Related side topic, anyone happen to know if KVM (and Qemu's) emulation of IPIs
> intentionally follows AMD instead of Intel?  I suspect it's unintentional,
> especially since KVM's initial xAPIC emulation came from Intel.  Not that it's
> likely to matter, but allowing level-triggered IPIs is bizarre, e.g. getting an
> EOI sent to the right I/O APIC at the right time via a level-triggered IPI seems
> extremely convoluted.

QEMU traditionally followed AMD a bit more than Intel for historical 
reasons.  Probably the code went QEMU->Xen->KVM even though it was 
contributed by Intel.

Paolo