[vfio-users] Help fixing iommu group

[thibaut noah]

I thought the patch was already applied in the version of fedora i was
using (4.2.3)

Nope, i thought this one meant boot was a valid option.
"The pcie_acs_override= boot option lets users opt-in specific devices or
sets of devices to assume ACS support."

My bad for the id.
How does one apply the patch to the kernel?


2016-02-17 22:07 GMT+01:00 Alex Williamson <alex.williamson at redhat.com>:

> On Wed, 17 Feb 2016 20:57:34 +0100
> thibaut noah <thibaut.noah at gmail.com> wrote:
>
> > Hello, i finally received an hba card for my zfs raid and the card is off
> > course breaking iommu grouping.
> > I tried the 2pci ports i had left (gpu in the first one) but the hba card
> > is always in group 1.
> > I tried several options in grub to override acs but that didn't change
> > anything (had downstream set before, added other options).
> > Could someone point me to a documentation or something to fix this? i
> > cannot use my vm at all
> > Here is a paste of the error i get :
> >
> > http://fpaste.org/324296/45573902/
> >
> > paste of grub file :
> > http://fpaste.org/324284/45573856/
> >
> > paste of ls -lha /sys/bus/pci/devices/0000:01:00.0/iommu_group/devices :
> > http://fpaste.org/324283/38515145/
> >
> > here is a paste of lspci -vvvnn :
> > http://fpaste.org/324281/55738407/
> >
> > Any help would be gladly appreciated thanks
>
> First, are you using a kernel that's patched with the pcie_acs_override
> option?  It's not upstream.  You also have:
>
> pcie_acs_override=downstream,id:103c:21c7,boot
>
> 103c:21c7 is the subsystem ID of your HBA, it's a single function
> endpoint, so that entry is useless on a couple fronts.  'boot' is not a
> valid option, maybe you ran into another option?
>
> pcie_acs_override=downstream
>
> should be sufficient, if you want to use id, it's the IDs of the root
> ports, for example:
>
> pcie_acs_override=id:8086:0c01,id:8086:0c09
>
> But of course nothing happens till the kernel is patched.
>
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