[PATCH v3 0/5] Pass zPCI hardware information via VFIO

[Matthew Rosato <mjrosato@linux.ibm.com>]

This patchset provides a means by which hardware information about the
underlying PCI device can be passed up to userspace (ie, QEMU) so that
this hardware information can be used rather than previously hard-coded
assumptions. The VFIO_DEVICE_GET_INFO ioctl is extended to allow capability
chains and zPCI devices provide the hardware information via capabilities.

A form of these patches saw some rounds last year but has been back-
tabled for a while.  The original work for this feature was done by Pierre
Morel. I'd like to refresh the discussion on this and get this finished up
so that we can move forward with better-supporting additional types of
PCI-attached devices.  

This feature is toggled via the CONFIG_VFIO_PCI_ZDEV configuration entry. 

Changes since v2:
- Added ACKs (thanks!)
- Patch 3+4: Re-write to use VFIO_DEVICE_GET_INFO capabilities rather than
  a vfio device region.

Matthew Rosato (5):
  s390/pci: stash version in the zpci_dev
  s390/pci: track whether util_str is valid in the zpci_dev
  vfio: Introduce capability definitions for VFIO_DEVICE_GET_INFO
  vfio-pci/zdev: Add zPCI capabilities to VFIO_DEVICE_GET_INFO
  MAINTAINERS: Add entry for s390 vfio-pci

 MAINTAINERS                         |   8 ++
 arch/s390/include/asm/pci.h         |   4 +-
 arch/s390/pci/pci_clp.c             |   2 +
 drivers/vfio/pci/Kconfig            |  13 ++++
 drivers/vfio/pci/Makefile           |   1 +
 drivers/vfio/pci/vfio_pci.c         |  37 ++++++++++
 drivers/vfio/pci/vfio_pci_private.h |  12 +++
 drivers/vfio/pci/vfio_pci_zdev.c    | 143 ++++++++++++++++++++++++++++++++++++
 include/uapi/linux/vfio.h           |  11 +++
 include/uapi/linux/vfio_zdev.h      |  78 ++++++++++++++++++++
 10 files changed, 308 insertions(+), 1 deletion(-)
 create mode 100644 drivers/vfio/pci/vfio_pci_zdev.c
 create mode 100644 include/uapi/linux/vfio_zdev.h

-- 
1.8.3.1