[report] boot a vm that with PCI only hierarchy devices and with GICv3 , it's failed.

[wanghaibin <wanghaibin.wang@huawei.com>]

Hi, all:

I met a problem, I just try to test PCI only hierarchy devices model (qemu/docs/pcie.txt  sections 2.3)

Here is part of qemu cmd:
-device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1 -device pci-bridge,chassis_nr=2,id=pci.2,bus=pci.1,addr=0x0 -device usb-ehci,id=usb,bus=pci.2,addr=0x2
-device virtio-scsi-pci,id=scsi0,bus=pci.2,addr=0x3 -netdev tap,fd=27,id=hostnet0,vhost=on,vhostfd=28 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:60:6b:1d,bus=pci.2,addr=0x1
-vnc 0.0.0.0:0 -device virtio-gpu-pci,id=video0,bus=pci.2,addr=0x4

A single DMI-PCI Bridge, a single PCI-PCI Bridge attached to it.  Four PCI_DEV legacy devices (usb, virtio-scsi-pci, virtio-gpu-pci, virtio-net-pci)attached to the PCI-PCI Bridge.
Boot the vm, it's failed.

I try to debug this problem, and the info just as follow:
(1) Since Eric Auger commit (0d44cdb631ef53ea75be056886cf0541311e48df: KVM: arm64: vgic-its: Interpret MAPD Size field and check related errors), This problem has been exposed.
    Of course, I think this commit must be correct surely.

(2) For guestOS, I notice Marc commit (e8137f4f5088d763ced1db82d3974336b76e1bd2: irqchip: gicv3-its: Iterate over PCI aliases to generate ITS configuration).  This commit brings in that the
    four PCI_DEV legacy devices shared the same devID, same its_dev, same ITT tables, but I think here calculate with wrong total msi vector count.
    (Currently, It seems the total count is the vector count of virtio-net-pci + PCI-PCI bridge + dmi-pci bridge, maybe here should be the total count of the four PCI_DEV legacy devices vector count),
    So that, any pci device using the over bounds eventID and mapti at a certain moment , the abnormal behavior will captured by Eric's commit.

Actually, I don't understand very well about non-transparent bridge, PCI aliases. So just supply these message.

Thanks.