[KOP]:: L2 fails to boot with vfio passed through device and memory > 128G

[bugproxy]

== Comment: #0 - SEETEENA THOUFEEK <email address hidden> - 2025-04-15 09:03:28 ==
+++ This bug was initially created as a clone of Bug #212409 +++

---Problem Description---
---Problem Description---
An L2 fails to boot inside an L1 when booted with a memory more than 128G and a VFIO device passthrough.

The issue is seen with both, when guest booted with virsh and as well as with a direct qemu cmdline.

Error:
------
[ 4.708646] tg3 0001:00:01.0: enabling device (0140 -> 0142)
[ 4.734333] tg3 0001:00:01.0: ibm,query-pe-dma-windows(2026) 800 8000000 20000001 returned 0, lb=2000000000 ps=100 wn=1
qemu-system-ppc64: Failed to create a window, ret = -1 (Invalid argument)
qemu-system-ppc64: Failed to create SPAPR window: Invalid argument
qemu: hardware error: vfio: DMA mapping failed, unable to continue

Contact Information = <email address hidden>

---uname output---
na

Machine Type = na

---Debugger---
A debugger is not configured

The patches are now in vfio-next branch in Cedric's tree:

  d7ee6466d4ab ("vfio/spapr: Fix L2 crash with PCI device passthrough and memory > 128G")
  ce07cf682e54 ("vfio/spapr: Enhance error handling in vfio_spapr_create_window()")

Links to commits:

  https://github.com/legoater/qemu/commit/ce07cf682e54eba1360e1546c248f1485016bb79
  https://github.com/legoater/qemu/commit/d7ee6466d4ab2515f57f41e1ee6015704d7938d3

~Amit

Machine Type = na

---Debugger---
A debugger is not configured

Contact Information = <email address hidden>

---uname output---
na

[Frank Heimes (fheimes)]

Hello Seeteena, that for having raised this.
May I ask which Ubuntu releases are affected? Is it only 25.04 or 24.04 and newer (up to 25.04)?
(Tag 'targetmilestone-inin2510' is set, but release 25.10 is not open for development yet.)