[vfio-users] iommu-grouping

[Erik Adler]

> a multifunction device without ACS isolation between the functions
Would think todays integrated chips came out of superfluous boxes of
Fruit Loops.

> Solutions are to use a plugin sata controller that will be isolated.
This is what I'll be doing. LSI 9211-8i. 10+ watts wasted :(

> or patch your kernel and override
Would like to avoid this as it can become a annoyance with time.

With some clicky neanderthal magic I just passed all of group 43 in
virt-manager for now. Ill be getting a HBA in a day or so.

Thanks for the feedback.

All the best.

On Wed, Sep 16, 2015 at 5:10 AM, Alex Williamson
<alex.l.williamson at gmail.com> wrote:
> On Tue, Sep 15, 2015 at 9:03 PM, Erik Adler <erik.adler at gmail.com> wrote:
>>
>> Is there something wrong with grouping 43 here? I cant pass
>> SATA controller: Intel Corporation C610/X99 series chipset 6-Port SATA
>> Controller [AHCI mode] (rev 05)
>>
>> The other sata controller in group 32 passes with no issues
>> SATA controller: Intel Corporation C610/X99 series chipset sSATA
>> Controller [AHCI mode] (rev 05)
>>
>> If there is a problem with the controller in group 43 how do I work around
>> it?
>>
>> my iommu-grouping
>> https://paste.debian.net/311890/
>
>
> Looks like it's supposed to.  Both groups contain a sata controller in a
> multifunction device without ACS isolation between the functions,
> potentially allowing non IOMMU translated peer-to-peer between functions.
> The difference between the groups is that the single other function in group
> 32 seems to be uninitialized and likely therefore has no driver while at
> least the smbus controller in group 43 does have a native host driver
> attached.  Solutions are to use a plugin sata controller that will be
> isolated, detach drivers from the smbus device risking who-knows-what, or
> patch your kernel and override.  When we talk about X99 being quirked for
> isolation, that's specifically referring to the root ports, the root complex
> devices have whatever isolation (or lack of isolation) Intel provides.