[PATCH pve-docs 0/2] qm: pci passthrough: the AtomicOps caveat of the all-functions form

[Yao Xu <xy2462381442@gmail.com>]

Passing a card with the shortened ``00:02`' syntax quietly costs the
guest PCIe AtomicOps. QEMU adds AtomicOp completer support to the
emulated root port only for a single-function device, so the port ends
up advertising none, and nothing in the config or the logs points at
the cause. The failure surfaces as a driver or ROCm problem several
layers away.

Patch 1 documents this next to the paragraph that introduces the
syntax. Patch 2 appends the function to the GPU example below it, which
currently pairs pcie=on with the all-functions form and would hit the
caveat as written.

Verified on Proxmox VE 9.2.4 with QEMU 11.0.2 and two RX 7900 XT
(gfx1100) in one q35 guest; the reproduction is in patch 1.

Yao Xu (2):
  qm: pci passthrough: note the AtomicOps caveat of all-functions form
  qm: pci passthrough: name the function in the GPU example

 qm-pci-passthrough.adoc | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

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2.50.1 (Apple Git-155)