[v4,0/3] vfio/sysbus-fdt: Prepare for Generic DT Pass-Through

Message

Geert Uytterhoeven Sept. 13, 2018, 3:44 p.m. UTC

Hi all,

This patch series prepares for exporting generic devices in DT using
vfio-platform, providing direct access from a QEMU+KVM guest to the
exported devices.

  - Patches 1-2 (submitted before by Eric Auger) make the vfio-platform
    device non-abstract, incl. matching using a compatible string.
  - Patch 3 allows dynamic vfio-platform devices again, without needing to
    create device-specific vfio types for each and every new device.

This will avoid having to write device-specific instantation methods for
each and every "simple" device using only a set of generic properties.
Devices that need more specialized handling will still be able provide
their own instantation methods.

Note that this series no longer contains "[PATCH 4/4] hw/arm/sysbus-fdt:
Add support for instantiating generic devices", following advice from Eric
Auger, as that patch needs more safeguards.  Hence this series now contains
only preparative work.

Changes compared to v4 ("hw/arm/sysbus-fdt: Generic DT Pass-Through"),
http://lists.nongnu.org/archive/html/qemu-devel/2018-07/msg05006.html):
  - Propagate g_file_get_contents() errors through errp,
  - Add Tested-by (with amd-xgbe),
  - s/From now on/Soon/ in patch description,
  - s/sysbus/vfio-platform/ in patch description,
  - Postpone "[PATCH 4/4] hw/arm/sysbus-fdt: Add support for instantiating
    generic devices".

Changes compared to v2 (not submitted to the mailing list):
  - Use the compatible values from sysfs instead of user-supplied
    manufacturer and model options,
  - Replace "hw/arm/sysbus-fdt: Enable rcar-gen3-gpio dynamic
    instatiation" by generic "hw/arm/sysbus-fdt: Add support for
    instantiating generic devices",
  - Reword patch descriptions,
  - Drop RFC state,
  - Drop "vfio: No-IOMMU mode support".

Changes compared to v1 ("R-Car Gen3 GPIO Pass-Through Prototype (QEMU)",
https://lists.gnu.org/archive/html/qemu-devel/2018-02/msg02716.html):
  - Restrict dynamic sysbus devices to TYPE_VFIO_PLATFORM, as suggested
    by Eric Auger.

Thanks!

For testing, this patch series, and the postponed "hw/arm/sysbus-fdt: Add
support for instantiating generic devices" are available in the
topic/rcar3-virt-gpio-passthrough-v4 branch of my git repository at
https://github.com/geertu/qemu.git.

This has been tested on a Renesas Salvator-XS board with R-Car H3 ES2.0
with SATA:

    -device vfio-platform,host=ee300000.sata

and GPIO (needs VFIO No-IOMMU support):

    -device vfio-platform,host=e6055400.gpio

Thanks for applying!

Auger Eric (2):
  vfio/platform: Make the vfio-platform device non-abstract
  hw/arm/sysbus-fdt: Allow device matching with DT compatible value

Geert Uytterhoeven (1):
  hw/arm/virt: Allow dynamic vfio-platform devices again

 hw/arm/sysbus-fdt.c             | 61 +++++++++++++++++++++++++--------
 hw/arm/virt.c                   |  1 +
 hw/vfio/amd-xgbe.c              |  1 +
 hw/vfio/calxeda-xgmac.c         |  1 +
 hw/vfio/platform.c              | 24 ++++++++++++-
 include/hw/vfio/vfio-platform.h |  3 +-
 6 files changed, 75 insertions(+), 16 deletions(-)