[PATCH v2 0/4] Reenable VFIO support on POWER systems

[Timothy Pearson]

----- Original Message -----
> From: "Alex Williamson" <alex.williamson at redhat.com>
> To: "Timothy Pearson" <tpearson at raptorengineering.com>
> Cc: "kvm" <kvm at vger.kernel.org>, "linuxppc-dev" <linuxppc-dev at lists.ozlabs.org>
> Sent: Monday, March 6, 2023 6:59:41 PM
> Subject: Re: [PATCH v2 0/4] Reenable VFIO support on POWER systems

> On Mon, 6 Mar 2023 18:35:22 -0600 (CST)
> Timothy Pearson <tpearson at raptorengineering.com> wrote:
> 
>> ----- Original Message -----
>> > From: "Alex Williamson" <alex.williamson at redhat.com>
>> > To: "Timothy Pearson" <tpearson at raptorengineering.com>
>> > Cc: "kvm" <kvm at vger.kernel.org>, "linuxppc-dev" <linuxppc-dev at lists.ozlabs.org>
>> > Sent: Monday, March 6, 2023 5:46:07 PM
>> > Subject: Re: [PATCH v2 0/4] Reenable VFIO support on POWER systems
>> 
>> > On Mon, 6 Mar 2023 11:29:53 -0600 (CST)
>> > Timothy Pearson <tpearson at raptorengineering.com> wrote:
>> >   
>> >> This patch series reenables VFIO support on POWER systems.  It
>> >> is based on Alexey Kardashevskiys's patch series, rebased and
>> >> successfully tested under QEMU with a Marvell PCIe SATA controller
>> >> on a POWER9 Blackbird host.
>> >> 
>> >> Alexey Kardashevskiy (3):
>> >>   powerpc/iommu: Add "borrowing" iommu_table_group_ops
>> >>   powerpc/pci_64: Init pcibios subsys a bit later
>> >>   powerpc/iommu: Add iommu_ops to report capabilities and allow blocking
>> >>     domains
>> >> 
>> >> Timothy Pearson (1):
>> >>   Add myself to MAINTAINERS for Power VFIO support
>> >> 
>> >>  MAINTAINERS                               |   5 +
>> >>  arch/powerpc/include/asm/iommu.h          |   6 +-
>> >>  arch/powerpc/include/asm/pci-bridge.h     |   7 +
>> >>  arch/powerpc/kernel/iommu.c               | 246 +++++++++++++++++++++-
>> >>  arch/powerpc/kernel/pci_64.c              |   2 +-
>> >>  arch/powerpc/platforms/powernv/pci-ioda.c |  36 +++-
>> >>  arch/powerpc/platforms/pseries/iommu.c    |  27 +++
>> >>  arch/powerpc/platforms/pseries/pseries.h  |   4 +
>> >>  arch/powerpc/platforms/pseries/setup.c    |   3 +
>> >>  drivers/vfio/vfio_iommu_spapr_tce.c       |  96 ++-------
>> >>  10 files changed, 338 insertions(+), 94 deletions(-)
>> >>   
>> > 
>> > For vfio and MAINTAINERS portions,
>> > 
>> > Acked-by: Alex Williamson <alex.williamson at redhat.com>
>> > 
>> > I'll note though that spapr_tce_take_ownership() looks like it copied a
>> > bug from the old tce_iommu_take_ownership() where tbl and tbl->it_map
>> > are tested before calling iommu_take_ownership() but not in the unwind
>> > loop, ie. tables we might have skipped on setup are unconditionally
>> > released on unwind.  Thanks,
>> > 
>> > Alex
>> 
>> Thanks for that.  I'll put together a patch to get rid of that
>> potential bug that can be applied after this series is merged, unless
>> you'd rather I resubmit a v3 with the issue fixed?
> 
> Follow-up fix is fine by me.  Thanks,
> 
> Alex

Just sent that patch in.  Thanks!