Open-IOV: initial public release

Open-IOV virtualizes NVIDIA GPUs so that unmodified guest drivers run with
real GPU functionality - CUDA first, 3D and video to follow - on unmodified
hosts, without a proprietary vGPU license and without patching any driver,
firmware or hypervisor.

Core principle: emulate the interface, pass through the work.

  kernel/     open-iov-vfio.ko - host VFIO mdev driver: virtual GPU device
              (PCI config space, BAR shadows, MSI-X), GSP boot emulation,
              GSP-RM message-queue/RPC emulation, memory model (GPU-VA to
              guest-PA discovery) and the semaphore-completion service that
              advances guest UVM progress.
  userspace/  libiov.so management API and examples.
  tools/      guest diagnostics, firmware analysis wrappers, RM probes.
  scripts/    stack manager, VM harness, build/load/test automation.
  config/     hardware/version profiles (the portability surface).
  docs/       documentation tree - start at docs/README.md.
  wiki/       long-form firmware and protocol deep dives.

Status: initialization works end to end for a stock 570.144 Linux guest on
Turing (TU104): driver probe, nvidia-smi, the full GSP-RM control battery,
object creation and the early CUDA/UVM start-up path. GPU work forwarding -
the step that makes CUDA kernels execute on real hardware - is the active
work item; see docs/04-implementation/01-known-knowns-and-unknowns.md.

License: BSD-3-Clause for the project; GPL-2.0 for kernel modules that link
GPL-only kernel interfaces. See LICENSE and docs/09-reference/legal-and-licensing.md.

1 files changed, 46 insertions, 0 deletions

diff --git a/tools/guest-diag/vmcycle.sh b/tools/guest-diag/vmcycle.sh
new file mode 100755
index 0000000..6faaa75
--- /dev/null
+++ b/tools/guest-diag/vmcycle.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+# vmcycle.sh - reload cycle for the emulated vGPU stack:
+#   stop QEMU -> remove mdevs -> rmmod/insmod open-iov-vfio.ko -> create a
+#   fresh mdev -> patch its UUID into the runtime launch script -> relaunch.
+#
+# ALL artifacts stay inside this directory (tools/guest-diag/) so nothing is
+# lost on reboot:
+#   launch_qemu_rootport.sh     - template QEMU command line (root-port fix)
+#   launch_qemu_rootport.run.sh - runtime copy with the current mdev UUID
+#   run/qemu.log                - QEMU stderr/stdout of the last launch
+#
+# Usage:  tools/guest-diag/vmcycle.sh
+# Env:    MDEV_PARENT (default: 0000:01:00.0)
+#         MDEV_TYPE   (default: nvidia-nvidia-vgpu-turing)
+set -e
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+TEMPLATE="$HERE/launch_qemu_rootport.sh"
+QEMU_SCRIPT="${QEMU_SCRIPT:-$HERE/launch_qemu_rootport.run.sh}"
+MODULE="${MODULE:-$HERE/../../kernel/open-iov-vfio.ko}"
+MDEV_PARENT="${MDEV_PARENT:-0000:01:00.0}"
+MDEV_TYPE="${MDEV_TYPE:-nvidia-nvidia-vgpu-turing}"
+RUNDIR="$HERE/run"
+
+mkdir -p "$RUNDIR"
+[ -f "$QEMU_SCRIPT" ] || cp "$TEMPLATE" "$QEMU_SCRIPT"
+
+pkill -f qemu-system-x86_64 2>/dev/null || true
+sleep 4
+for m in /sys/bus/mdev/devices/*; do
+    [ -d "$m" ] && echo 1 | sudo tee "$m/remove" >/dev/null
+done
+sudo rmmod open_iov_vfio 2>/dev/null || true
+sudo insmod "$MODULE"
+U=$(uuidgen)
+echo "$U" | sudo tee "/sys/class/mdev_bus/$MDEV_PARENT/mdev_supported_types/$MDEV_TYPE/create" >/dev/null
+sed -i "s|/sys/bus/mdev/devices/[0-9a-f-]*|/sys/bus/mdev/devices/$U|" "$QEMU_SCRIPT"
+mkdir -p /tmp/sockets/e726ba0b-204f-4ec9-91da-983ed7f41d06
+rm -f /tmp/qemu-guest-agent.sock /tmp/qemu-qmp.sock
+(setsid nohup "$QEMU_SCRIPT" > "$RUNDIR/qemu.log" 2>&1 &)
+sleep 6
+if pgrep -f qemu-system-x86_64 >/dev/null; then
+    echo "VM up (mdev $U)  [qemu log: $RUNDIR/qemu.log]"
+else
+    echo "VM FAILED"; tail -3 "$RUNDIR/qemu.log"; exit 1
+fi