the command "dmesg | grep -i dma" Give no results. Is there anything else i should check Alex?
If the solution to this is to submit a bug report, who should i send it too? I believe the AACRAID driver is built into the Linux kernel. On Tue, Jul 12, 2016 at 9:51 AM, Alex Williamson <alex.william...@redhat.com> wrote: > On Sun, 10 Jul 2016 13:17:41 -0500 > David <david...@gmail.com> wrote: > >> I have run into a strange problem, while setting up my Fedora 24 box for >> KVM, i noticed that my raid array stopped showing as an available drive. >> After a lot of troubleshooting and reinstalling linux to this PC 2 more >> times, i have narrowed it down to one setting in my GRUB config. >> intel_iommu=on >> >> Just taking that one setting out and rebuilding my grub2-efi.cfg will make >> the array readable again. When IOMMU is on, the system can see that there >> is a raid card and array, but it lists the partition table as unknown. It >> also will not successfully create a new GPT partition table on the array. >> With IOMMU off, it can read the partition table and partition fine, read >> and write data, and everything works fine. >> >> My raid is 4 1TB disks in Raid 10e, GPT partition formatted NTFS. >> >> $ lspci -v -s 03:0e.0 >> 03:0e.0 RAID bus controller: Adaptec AAC-RAID >> Subsystem: Adaptec 3805 >> Flags: bus master, stepping, 66MHz, medium devsel, latency 32, IRQ 57 >> Memory at fa600000 (64-bit, non-prefetchable) [size=2M] >> Expansion ROM at fa800000 [disabled] [size=256K] >> Capabilities: <access denied> >> Kernel driver in use: aacraid >> Kernel modules: aacraid > > > No DMAR faults in dmesg? There's a fair chance this is one of those > devices that does DMA with the wrong requester ID and therefore > enabling the IOMMU prevents it from working. We have a mechanism in > the kernel to handle such DMA aliasing if you can verify the issue. > Thanks, > > Alex -- David david...@gmail.com _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
