On Mon, 2021-11-29 at 20:10 +0100, Claudio Fontana wrote: > > Hmm I thought what you actually care for, for cpu "host", is just the > kvm_enable_x2apic() call, not the kvm_default_props. > > > > Do you also expect the kvm_default_prop "kvm-msi-ext-dest-id" to be switch to > "on" and applied?
It's already on today. It just isn't *true* because QEMU never called kvm_enable_x2apic(). So what I care about (in case ∃ APIC IDs >= 255) is two things: 1. Qemu needs to call kvm_enable_x2apic(). 2. If that *fails* qemu needs to *stop* advertising X2APIC and ext-dest-id. That last patch snippet in pc_machine_done() should suffice to achieve that, I think. Because if kvm_enable_x2apic() fails and qemu has been asked for that many CPUs, it aborts completely. Which seems right.
smime.p7s
Description: S/MIME cryptographic signature
