Messages in this thread | | | Subject | Re: [PATCH v2 3/3] KVM: X86: Let's harden the ipi fastpath condition edge-trigger mode | From | Paolo Bonzini <> | Date | Tue, 8 Jun 2021 19:40:52 +0200 |
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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
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