On Fri, 9 Oct 2015, Andreas Hartmann wrote: > Hello Jörg, > > On 10/09/2015 at 04:59 PM, Joerg Roedel wrote: > > On Fri, Oct 09, 2015 at 11:15:05AM +0200, Andreas Hartmann wrote: > >> v4.3-rc4 isn't usable at all for me as long as is hangs the machine on > >> the necessary PCI passthrough for VMs (I need them). > > > > If the fix I just sent you works, could you please test this again with > > a (patched) v4.3-rc4 kernel? > > Your IOMMU-patch works fine - but the ata-problem can be seen here, too. > Same behavior as with 4.1.10. Could you try another ata disk? (copy the whole filesystem to it and run the same test) It may be bug in disk's firmware. Mikulas