On Wed, Jun 29, 2016 at 09:08:29AM +0200, Paolo Bonzini wrote: > > > On 29/06/2016 08:36, Jan Kiszka wrote: > > On 2016-06-29 08:32, Peter Xu wrote: > >> Hi, all, > >> > >> I am thinking about whether it's possible to write up a unit test > >> program for emulated IOMMUs (of course, Intel IOMMU would be the first > >> one). This can provide us the chance to do quick functional regression > >> tests for IOMMU just like other devices, as well as customized test > >> sequences which is hard to do in real guests (e.g., specific cache > >> invalidations, error injections), etc.. > >> > >> I see that current qtest framework cannot support well on testing > >> IOMMUs. For DMA remapping, things would be quite smooth. The problem > >> is that, we still do not have a complete test framework on the > >> interrupts. E.g., currently qtest is still an acceleration type, in > >> which we have no vCPUs, as well as interrupt chips like APICs (please > >> correct me if I am wrong). > > qtest does have VCPUs, they just run a dummy loop. You do have an APIC > too, but reading it doesn't work because cpu_get_current_apic() returns > NULL.
Right, thanks to point out. > > You can use kvm-unit-tests if qtest is not flexible enough. It's > probably the simplest thing to do if you also want to test kernel LAPIC > and split irqchip operation. Will have a look. Thanks Paolo. :) -- peterx
