On 10/7/20 2:56 PM, Matthew Rosato wrote:
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.
Link to latest QEMU patch set: https://lists.gnu.org/archive/html/qemu-devel/2020-10/msg01948.html
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
