[Midnightbsd-cvs] [MidnightBSD/src] bd48ea: A Hyper-V vPCI emulation change can cause SR-IOV (...

[Lucas Holt]

  Branch: refs/heads/stable/2.1
  Home:   https://github.com/MidnightBSD/src
  Commit: bd48ea1574c9a81623285b89b90a7afc73a27068
      https://github.com/MidnightBSD/src/commit/bd48ea1574c9a81623285b89b90a7afc73a27068
  Author: Lucas Holt <luke at foolishgames.com>
  Date:   2022-01-13 (Thu, 13 Jan 2022)

  Changed paths:
    M sys/dev/hyperv/pcib/vmbus_pcib.c

  Log Message:
  -----------
  A Hyper-V vPCI emulation change can cause SR-IOV (Single-Root I/O
Virtualization) and DDA (Discrete Device Assignment) devices to fail to
operate correctly under Hyper-V.

In recent Hyper-V releases on Windows Server 2022, the vPCI code does
not initialize the last 4 bit of device registers.  This behavior change
could result in failure to initialize guest drivers for SR-IOV or DDA
devices.

Obtained from: FreeBSD