[vfio-users] Help fixing iommu group

[Eric Auger]

Hi Thibaut,
On 02/19/2016 08:32 AM, thibaut noah wrote:
> Putting the patch i found here https://lkml.org/lkml/2013/5/30/513 on a
> txt file and running it it just hangs indefinitly, is this patch too old?
I applied the patch on a 4.5.0-rc4 and it worked for me (ARM64) so I
don't think the patch is outdated.

On my side I simply used pcie_acs_override=downstream in grub command line.

Best Regards

Eric
> 
> 2016-02-18 20:48 GMT+01:00 thibaut noah <thibaut.noah at gmail.com
> <mailto:thibaut.noah at gmail.com>>:
> 
>     Thanks for link, gonna try to find the proper kernel patch then.
> 
>     2016-02-17 23:10 GMT+01:00 Alex Williamson
>     <alex.williamson at redhat.com <mailto:alex.williamson at redhat.com>>:
> 
>         On Wed, 17 Feb 2016 23:02:18 +0100
>         thibaut noah <thibaut.noah at gmail.com
>         <mailto:thibaut.noah at gmail.com>> wrote:
> 
>         > I thought the patch was already applied in the version of fedora i was
>         > using (4.2.3)
> 
>         There is currently no expectation that the pcie_acs_override
>         patch will
>         ever go upstream, thus my encouragement to use a system that
>         properly
>         supports ACS.
> 
>         > 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?
> 
>         https://www.kernel.org/doc/Documentation/applying-patches.txt
> 
> 
>         > 2016-02-17 22:07 GMT+01:00 Alex Williamson
>         <alex.williamson at redhat.com <mailto:alex.williamson at redhat.com>>:
>         >
>         > > On Wed, 17 Feb 2016 20:57:34 +0100
>         > > thibaut noah <thibaut.noah at gmail.com
>         <mailto: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.
>         > >
> 
> 
> 
> 
> 
> _______________________________________________
> vfio-users mailing list
> vfio-users at redhat.com
> https://www.redhat.com/mailman/listinfo/vfio-users
>