linux-kernel - Re: [PATCH] include/linux/vfio.h: Guard powerpc-specific functions with CONFIG_VFIO_SPAPR

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Date:   Thu, 8 Jun 2017 23:10:10 +1000
From:   Alexey Kardashevskiy <aik@...abs.ru>
To:     Murilo Opsfelder Araújo <mopsfelder@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        kbuild test robot <lkp@...el.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Alex Williamson <alex.williamson@...hat.com>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] include/linux/vfio.h: Guard powerpc-specific functions
 with CONFIG_VFIO_SPAPR_EEH

On 08/06/17 22:45, Murilo Opsfelder Araújo wrote:
> On 06/08/2017 08:41 AM, Michael Ellerman wrote:
>> Alexey Kardashevskiy <aik@...abs.ru> writes:
>>
>>> Hi,
>>>
>>> How did you manage to have CONFIG_EEH=y and CONFIG_VFIO_SPAPR_EEH=n? "make
>>> oldconfig" fixes this to CONFIG_VFIO_SPAPR_EEH=y.
>>
>> Hmm, Murilo did you confirm the bug still happens on upstream with that
>> rand config?
> 
> Yes, it's still happening with next-20170607.


The config you attached in the first mail has CONFIG_VFIO_SPAPR_EEH=m, here
is my confusion. The config from the link below does not have KVM_BOOK3S_64
which selects SPAPR_TCE_IOMMU and which in turn selects VFIO_IOMMU_SPAPR_TCE.

So
https://github.com/0day-ci/linux/commit/36ed1ddb05e132aa3cfbb610f0f8402a0774da12
looks correct.



> 
> For me, `make oldconfig` hasn't changed it to CONFIG_VFIO_SPAPR_EEH=y. See:
> 
>     $ git clean -dfxq
>     $ git reset --hard origin/master
>     HEAD is now at 8d1b80c Add linux-next specific files for 20170607
> 
>     $ curl http://kisskb.ellerman.id.au/kisskb/buildresult/12982362/config/ -o .config
>     $ grep -E 'EEH|SPAPR' .config
>     CONFIG_EEH=y
>     # CONFIG_SPAPR_TCE_IOMMU is not set
> 
>     $ yes '' | make oldconfig
> 
>     $ grep -E 'EEH|SPAPR' .config
>     CONFIG_EEH=y
>     # CONFIG_SPAPR_TCE_IOMMU is not set
> 
>     $ make -j 160 ARCH=powerpc
>     ...
>     drivers/vfio/pci/vfio_pci.o: In function `.vfio_pci_release':
>     vfio_pci.c:(.text+0xa98): undefined reference to `.vfio_spapr_pci_eeh_release'
>     drivers/vfio/pci/vfio_pci.o: In function `.vfio_pci_open':
>     vfio_pci.c:(.text+0x1420): undefined reference to `.vfio_spapr_pci_eeh_open'
>     make: *** [vmlinux] Error 1
> 


-- 
Alexey