On 03/03/20 07:27, Sean Christopherson wrote: > Odds are good that this doesn't solve all the problems with running nested > VMX and a userspace LAPIC, but I'm at least able to boot a kernel and run > unit tests, i.e. it's less broken than before. Not that it matters, I'm > guessing no one actually uses this configuration, e.g. running a SMP > guest with the current KVM+kernel hangs during boot because Qemu > advertises PV IPIs to the guest, which require an in-kernel LAPIC. I > stumbled on this disaster when disabling the in-kernel LAPIC for a > completely unrelated test. I'm happy even if it does nothing more than > get rid of the awful logic vmx_check_nested_events(). Yes, userspace LAPIC is more or less constantly broken. I think it should be deprecated in QEMU. Paolo
