[vfio-users] Help fixing iommu group

[thibaut noah]

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?

2016-02-18 20:48 GMT+01:00 thibaut noah <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>:
>
>> On Wed, 17 Feb 2016 23:02:18 +0100
>> thibaut noah <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
>> >:
>> >
>> > > 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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