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From: Pierre Morel <>
Subject: [PATCH 0/4] Retrieving zPCI specific info with VFIO
Date: Fri, 10 May 2019 10:22:31 +0200	[thread overview]
Message-ID: <> (raw)

Using the PCI VFIO interface allows userland, a.k.a. QEMU, to retrieve
ZPCI specific information without knowing Z specific identifiers
like the function ID or the function handle of the zPCI function
hidden behind the PCI interface. 
By using the VFIO_IOMMU_GET_INFO ioctl we enter the vfio_iommu_type1
ioctl callback and can insert there the treatment for a new Z specific
Once in vfio_iommu_type1 we can retrieve the real iommu device,
s390_iommu and call the get_attr iommu operation's callback
in which we can retrieve the zdev device and start clp operations
to retrieve Z specific values the guest driver is concerned with.
To share the code with arch/s390/pci/pci_clp.c the original functions
in pci_clp.c to query PCI functions and PCI functions group are
modified so that they can be exported.

A new function clp_query_pci() replaces clp_query_pci_fn() and
the previous calls to clp_query_pci_fn() and clp_query_pci_fngrp()
are replaced with calls to zdev_query_pci_fn() and zdev_query_pci_fngrp()
using a zdev pointer as argument.

These two functions are exported to be used from out of the s390_iommu

Pierre Morel (4):
  s390: pci: Exporting access to CLP PCI function and PCI group
  vfio: vfio_iommu_type1: Define VFIO_IOMMU_INFO_CAPABILITIES
  s390: iommu: Adding get attributes for s390_iommu
  vfio: vfio_iommu_type1: implement VFIO_IOMMU_INFO_CAPABILITIES

 arch/s390/include/asm/pci.h     |  3 ++
 arch/s390/pci/pci_clp.c         | 72 ++++++++++++++++---------------
 drivers/iommu/s390-iommu.c      | 77 +++++++++++++++++++++++++++++++++
 drivers/vfio/vfio_iommu_type1.c | 95 ++++++++++++++++++++++++++++++++++++++++-
 include/linux/iommu.h           |  4 ++
 include/uapi/linux/vfio.h       | 10 +++++
 6 files changed, 226 insertions(+), 35 deletions(-)


             reply	other threads:[~2019-05-10  8:23 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-10  8:22 Pierre Morel [this message]
2019-05-10  8:22 ` [PATCH 1/4] s390: pci: Exporting access to CLP PCI function and PCI group Pierre Morel
2019-05-10 10:21   ` Robin Murphy
2019-05-10 14:45     ` Pierre Morel
2019-05-10  8:22 ` [PATCH 2/4] vfio: vfio_iommu_type1: Define VFIO_IOMMU_INFO_CAPABILITIES Pierre Morel
2019-05-16 14:57   ` Christian Borntraeger
2019-05-16 18:54     ` Alex Williamson
2019-05-16 18:31   ` Alex Williamson
2019-05-17  8:18     ` Pierre Morel
2019-05-10  8:22 ` [PATCH 3/4] s390: iommu: Adding get attributes for s390_iommu Pierre Morel
2019-05-10  8:22 ` [PATCH 4/4] vfio: vfio_iommu_type1: implement VFIO_IOMMU_INFO_CAPABILITIES Pierre Morel
2019-05-16 18:40   ` Alex Williamson
2019-05-17  8:17     ` Pierre Morel

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