Hi Mathias, here is a report about something strange happening on my system after a recent IOMMU change. I am starting to see this message at boot: xhci_hcd 0000:02:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x000f address=0xff00ffffffefe000 flags=0x0000] It means that the XHCI device tried a DMA access at address 0xff00ffffffefe000, which was not mapped in the IOMMU page table. Devices attached to that XHCI controller will not work after that message. There is a related change in the IOMMU code which uncovered this, the change basically lets the IOMMU dma-allocator not allocate below 4GB by default, but use the whole space covered by the DMA mask. To better track this down I limited the DMA-space to 48 bits, and the message still shows up. I think this might be a problem in the XHCI driver, e.g. it might mangle an allocated DMA address somehow if it is bigger than 32 bit. The device behind 0000:02:00.0 is a 02:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 43d0 (rev 01) Please let me know what I can do to help tracking this down. Regards, -- Jörg Rödel jroedel@xxxxxxx SUSE Software Solutions Germany GmbH Frankenstraße 146 90461 Nürnberg Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
