On Thu, Jun 23, 2022 at 12:41:00PM +0100, Robin Murphy wrote: > On 2022-06-23 12:33, Joerg Roedel wrote: > > On Wed, Jun 22, 2022 at 02:12:39PM +0100, Robin Murphy wrote: > > > Thanks for your bravery! > > > > It already starts, with that patch I am getting: > > > > xhci_hcd 0000:02:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT > > domain=0x000f address=0xff00ffffffefe000 flags=0x0000] > > > > In my kernel log. The device is an AMD XHCI controller and seems to > > funciton normally after boot. The message disappears with > > iommu.forcedac=0. > > > > Need to look more into that... > > Given how amd_iommu_domain_alloc() sets the domain aperture, presumably the > DMA address allocated was 0xffffffffffefe000? Odd that it gets bits punched > out in the middle rather than simply truncated off the top as I would have > expected :/
So even more weird, as a workaround I changed the AMD IOMMU driver to allocate a 4-level page-table and limit the DMA aperture to 48 bits. I still get the same message. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
