One can only imagine that the driver for this particular piece of hardware uses the iommu. The only other case I know of is the AMD cards with their proprietary driver, which is incompatible with activating iommu in the bios. Here the conflict must be in the aacraid driver. If I were smarter, I'd read the source of the driver. I suppose you could file a bug report.
> On Jul 10, 2016, at 11:17 AM, 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 > > $ lsblk -f > NAME FSTYPE LABEL UUID MOUNTPOINT > sda > ├─sda1 vfat efi 9E87-0ECF > ├─sda2 ext4 boot 4f8d2664-8fc0-4779-ac18-6f0c06152d27 > └─sda3 crypto_LUKS ccee7bd2-4dce-4966-addb-bba6194ade93 > sdb > > * with IOMMU on, lsblk -f shows that it sees SDB, but with no file system or > label. > > $ uname -r > 4.6.3-300.fc24.x86_64 > > Screen shot of gnome Disks = > > <Screenshot from 2016-07-10 12-49-30.png> > > > > -- > David > david...@gmail.com > _______________________________________________ > vfio-users mailing list > vfio-users@redhat.com > https://www.redhat.com/mailman/listinfo/vfio-users
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