Bug 2222009

Summary:	Warn when PCIe devices are plugged into non-zero slot of a downstream PCIe port
Product:	Red Hat Enterprise Linux 9	Reporter:	Ani Sinha <anisinha>
Component:	qemu-kvm	Assignee:	Ani Sinha <anisinha>
qemu-kvm sub component:	PCI	QA Contact:	Yiqian Wei <yiwei>
Status:	POST ---	Docs Contact:
Severity:	low
Priority:	unspecified	CC:	jinzhao, juzhang, virt-maint
Version:	9.3	Keywords:	Triaged
Target Milestone:	rc
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Description Ani Sinha 2023-07-11 13:46:27 UTC

Please see description in BZ 2128929.

The following combination is illegal as the address 0x2.0x5 is invalid on a pcie root port:

-device '{"driver":"pcie-root-port","port":21,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x2.0x5"}' \

{"execute":"device_add","arguments":{"driver":"virtio-net-pci","netdev":"hostnet1","mac":"00:11:22:33:44:03","id": "net1","bus":"pci.6","addr":"0x2.0x5"}}

Add a warning to let users know they are using an invalid configuration. 

This has already been fixed upstream with this commit:

https://gitlab.com/qemu-project/qemu/-/commit/ca92eb5defcf9d1c2106341744a73a03cf26e824

We can test this bug when we rebase QEMU to version 8.1 or above and mark it as fixed upon rebase.