>>> On 18.04.17 at 09:34, <roger....@citrix.com> wrote: > (XEN) Before DMA_GCMD_TE > ( > > The hang seems to happen when writing DMA_GCMD_TE to the global command > register, which enables the DMA remapping. After that the box is completely > unresponsive, not even the watchdog is working.
How sure are you that this is pre-Haswell specific vs e.g. chipset or firmware (think of RMRRs [or their lack] for the latter) dependent? Iirc Elena's command line specifiable RMRR patch series was motivated by similar behavior she had observed on some system. Another odd aspect is - why would IOMMU enabling cause the hang only when intending to use a PVH Dom0? The IOMMU is being enabled in either case, which again might point at differences in use of memory. Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel