Hi, > > (XEN) **************************************** > > (XEN) Panic on CPU 0: > > (XEN) IO-APIC + timer doesn't work! Boot with apic_verbosity=debug and send a report. Then try booting with the 'noapic' option > > (XEN) **************************************** > > Just tried the same a few days ago. Adding a second vcpu made things work. > I am going to go out on a limb and say it is unlikely for the Xen side > of things to be broken. We have machines in XenServers test lab which > support x2apic but have it disabled in this manor because of a lack of > EIM (or due to errata). I'm not so sure. non-SMP setup with x2apic is probably pretty rare on physical hardware and I wouldn't be surprised if that happens to hit a untested code path in Xen ... > I would look into what KVM/qemu does differently as a result of the > "+x2apic" flag, and whether it is simply the reported cpuid feature, or > whether it affects the legacy ioapic emulation. ... but enabling x2apic for a guest depending on legacy ioapic stuff is pretty unlikely too, so that setup being emulated incorrectly without being noticed so far wouldn't surprise me too. cheers, Gerd -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
