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
