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.
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
