[vfio-users] intel_iommu=on and aacraid / Adaptec 3805

[A de Beus]

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 <david283 at 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
> david283 at gmail.com
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