@whitequark✧✦Catherine✦✧ The explanation in a random Intel chipset doc I found isn't that much better:

intel.com/content/dam/doc/data
--
PCIe/DMI “Stop and Scream”
...per PCIe port
...disallow sending of poisoned data onto PCIe and instead convert disable the PCIe port that was the target of poisoned data
...there have been PCIe/DMI devices that have ignored the poison bit, and committed the data which can corrupt the I/O device
--

So, disable PCIe port on error, instead of tagging data as poisoned. Nice name.

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