Hi Alex, Any comments on it? :-) With this version, the vfio-mdev-pci driver could work with non-singleton groups, also it works with vfio-pci as well. Regards, Yi Liu > From: Liu, Yi L > Sent: Thursday, September 5, 2019 3:59 PM > To: alex.williamson@xxxxxxxxxx; kwankhede@xxxxxxxxxx > Subject: [PATCH v2 00/13] vfio_pci: wrap pci device as a mediated device > > This patchset aims to add a vfio-pci-like meta driver as a demo > user of the vfio changes introduced in "vfio/mdev: IOMMU aware > mediated device" patchset from Baolu Lu. Besides the test purpose, > per Alex's comments, it could also be a good base driver for > experimenting with device specific mdev migration. > > Specific interface tested in this proposal: > *) int mdev_set_iommu_device(struct device *dev, > struct device *iommu_device) > introduced in the patch as below: > "[PATCH v5 6/8] vfio/mdev: Add iommu related member in mdev_device" > > Patch Overview: > *) patch 1 ~ 7: code refactor for existing vfio-pci module > move the common codes from vfio_pci.c to > vfio_pci_common.c > *) patch 8: add protection to perm_bits alloc/free > *) patch 9: add vfio-mdev-pci sample driver > *) patch 10: refine the sample driver > *) patch 11 - 13: make the sample driver work for non-singleton groups > also work for vfio-pci and vfio-mdev-pci mixed usage > includes vfio-mdev-pci driver change and vfio_iommu_type1 > changes. > > Links: > *) Link of "vfio/mdev: IOMMU aware mediated device" > https://lwn.net/Articles/780522/ > *) Previous versions: > RFC v1: https://lkml.org/lkml/2019/3/4/529 > RFC v2: https://lkml.org/lkml/2019/3/13/113 > RFC v3: https://lkml.org/lkml/2019/4/24/495 > Patch v1: https://www.spinics.net/lists/kvm/msg188952.html > *) may try it with the codes in below repo > current version is branch "v5.3-rc7-pci-mdev": > https://github.com/luxis1999/vfio-mdev-pci-sample-driver.git > > Test done on two NICs which share an iommu group. > > ------------------------------------------------------------------- > | NIC0 | NIC1 | vIOMMU | VMs | Passtrhu > ------------------------------------------------------------------- > Test#0 | vfio-pci | vfio-pci | no | 1 | pass > ------------------------------------------------------------------- > Test#1 | vfio-pci | vfio-pci | no | 2 | fail[1] > ------------------------------------------------------------------- > Test#2 | vfio-pci | vfio-pci | yes | 1 | fail[2] > ------------------------------------------------------------------- > Test#3 | vfio-pci-mdev | vfio-pci | no | 1 | pass > ------------------------------------------------------------------- > Test#4 | vfio-pci-mdev | vfio-pci | no | 2 | fail[3] > ------------------------------------------------------------------- > Test#5 | vfio-pci-mdev | vfio-pci | yes | 1 | fail[4] > ------------------------------------------------------------------- > Tips: > [1] qemu-system-x86_64: -device vfio-pci,host=01:00.1,id=hostdev0,addr=0x6: > vfio 0000:01:00.1: failed to open /dev/vfio/1: Device or resource busy > [2] qemu-system-x86_64: -device vfio-pci,host=01:00.1,id=hostdev0,addr=0x6: > vfio 0000:01:00.1: group 1 used in multiple address spaces > [3] qemu-system-x86_64: -device vfio-pci,host=01:00.1,id=hostdev0,addr=0x6: > vfio 0000:01:00.1: failed to setup container for group 1: Failed to set > iommu for container: Device or resource busy > [4] qemu-system-x86_64: -device vfio-pci,host=01:00.1,id=hostdev0,addr=0x6: > vfio 0000:01:00.1: failed to setup container for group 1: Failed to set > iommu for container: Device or resource busy > Or > qemu-system-x86_64: -device vfio-pci,sysfsdev=/sys/bus/mdev/devices/ > 83b8f4f2-509f-382f-3c1e-e6bfe0fa1003: vfio 83b8f4f2-509f-382f-3c1e- > e6bfe0fa1003: failed to setup container for group 11: Failed to set iommu > for container: Device or resource busy > Some other tests are not listed. Like bind NIC0 to vfio-pci-mdev and try to > passthru it with "vfio-pci,host=01:00.0", kernel will throw a warn log and > fail the operation. > > Please feel free give your comments. > > Thanks, > Yi Liu > > Change log: > patch v1 -> patch v2: > - the sample driver implementation refined > - the sample driver can work on non-singleton iommu groups > - the sample driver can work with vfio-pci, devices from a non-singleton > group can either be bound to vfio-mdev-pci or vfio-pci, and the > assignment of this group still follows current vfio assignment rule. > > RFC v3 -> patch v1: > - split the patchset from 3 patches to 9 patches to better demonstrate > the changes step by step > > v2->v3: > - use vfio-mdev-pci instead of vfio-pci-mdev > - place the new driver under drivers/vfio/pci while define > Kconfig in samples/Kconfig to clarify it is a sample driver > > v1->v2: > - instead of adding kernel option to existing vfio-pci > module in v1, v2 follows Alex's suggestion to add a > separate vfio-pci-mdev module. > - new patchset subject: "vfio/pci: wrap pci device as a mediated device" > > Alex Williamson (1): > samples: refine vfio-mdev-pci driver > > Liu Yi L (12): > vfio_pci: move vfio_pci_is_vga/vfio_vga_disabled to header > vfio_pci: refine user config reference in vfio-pci module > vfio_pci: refine vfio_pci_driver reference in vfio_pci.c > vfio_pci: make common functions be extern > vfio_pci: duplicate vfio_pci.c > vfio_pci: shrink vfio_pci_common.c > vfio_pci: shrink vfio_pci.c > vfio/pci: protect cap/ecap_perm bits alloc/free with atomic op > samples: add vfio-mdev-pci driver > samples/vfio-mdev-pci: call vfio_add_group_dev() > vfio/type1: use iommu_attach_group() for wrapping PF/VF as mdev > vfio/type1: track iommu backed group attach > > drivers/vfio/pci/Makefile | 9 +- > drivers/vfio/pci/vfio_mdev_pci.c | 497 ++++++++++++ > drivers/vfio/pci/vfio_pci.c | 1449 +--------------------------------- > drivers/vfio/pci/vfio_pci_common.c | 1455 > +++++++++++++++++++++++++++++++++++ > drivers/vfio/pci/vfio_pci_config.c | 9 + > drivers/vfio/pci/vfio_pci_private.h | 36 + > drivers/vfio/vfio_iommu_type1.c | 185 ++++- > samples/Kconfig | 11 + > 8 files changed, 2194 insertions(+), 1457 deletions(-) > create mode 100644 drivers/vfio/pci/vfio_mdev_pci.c > create mode 100644 drivers/vfio/pci/vfio_pci_common.c > > -- > 2.7.4
