On 2015-04-20 19:07, Stefan Hajnoczi wrote: > I wonder whether the following two x2apic issues are related: > > Solaris 10 U11 network doesn't work > https://bugzilla.redhat.com/show_bug.cgi?id=1040500 > > kvm - fails to setup timer interrupt via io-apic > (Thanks to Michael Tokarev for posting this link) > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=528077#68 > > It seems KVM's x2apic emulation works with regular Linux and Windows > guests, but not necessarily with other OSes. KVM's x2apic is kind of paravirtual - without VT-d interrupt remapping. That may confuse the guest, though it should work. But Xen already refuses to pick it according to the second report: | (XEN) Not enabling x2APIC: depends on iommu_supports_eim. > > Has anyone looked into this? Not yet. Is there a handy reproduction guest image? Or maybe someone would like to start with tracing what the guest and the host do. Jan
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