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Description of problem: No slot/function available for xio3130-downstream when boot up with 1 upstream with multiple downstreams Version-Release number of selected component (if applicable): kernel-3.10.0-373.el7.x86_64 qemu-kvm-rhev-2.5.0-4.el7.x86_64 seabios-1.9.1-2.el7.x86_64 How reproducible: 3/3 Steps to Reproduce: 1. Boot guest with multiple downstreams: 1 upsteam attached multiple downstream sh mulit-downstream.sh 33 [root@localhost home]# cat multi-downstream.sh #!/bin/sh MACHINE=q35 SMP=4,cores=2,threads=2,sockets=1 MEM=2G GUEST_IMG=/home/rhel.img IMG_FORMAT=qcow2 CLI="/usr/libexec/qemu-kvm -enable-kvm -M $MACHINE -smp $SMP -m $MEM -name vm1 -drive file=$GUEST_IMG,if=none,id=guest-img,format=$IMG_FORMAT,werror=stop,rerror=stop -device ide-hd,drive=guest-img,bus=ide.0,unit=0,id=os-disk,bootindex=0 -spice port=5931,disable-ticketing -vga qxl -monitor stdio -serial unix:/tmp/console,server,nowait -qmp tcp:0:6666,server,nowait -chardev file,path=/home/seabios.log,id=seabios -device isa-debugcon,chardev=seabios,iobase=0x402 -boot menu=on,reboot-timeout=8,strict=on -device ioh3420,bus=pcie.0,id=root.0,slot=1 -device x3130-upstream,bus=root.0,id=upstream" while [ ${i:=0} -lt ${1:-0} ] do dstreamId=$((i)) chassisId=$((dstreamId+1)) blkDiskId=$((dstreamId)) qemu-img create -f qcow2 /home/disk/disk$blkDiskId 100M CLI="$CLI -device xio3130-downstream,bus=upstream,id=downstream$dstreamId,chassis=$chassisId" CLI="$CLI -drive file=/home/disk/disk$blkDiskId,if=none,id=disk$blkDiskId,format=qcow2 " CLI="$CLI -device virtio-blk-pci,scsi=off,drive=disk$blkDiskId,id=virtio-blk$blkDiskId,bus=downstream$dstreamId,disable-modern=off,disable-legacy=on" i=$((i+1)) done $CLI Actual results: No slot/function available for xio3130-downstream Expected results: guest can boot up with multiple downstreams (256 downstreams) Additional info:
Hi, I didn't run the script, but it seems you are trying to attach 33 downstream ports to an upstream port? If so, this is not a valid configuration because an upstream port supports maximum 32 downstream ports. You can uses nested switches if you need more than 32 ports, on port 31 add an upstream port and you have now another 32 ports. Thanks, Marcel
(In reply to Marcel Apfelbaum from comment #2) > Hi, > > I didn't run the script, but it seems you are trying to attach 33 downstream > ports to an upstream port? If so, this is not a valid configuration because > an upstream port supports maximum 32 downstream ports. > > You can uses nested switches if you need more than 32 ports, on port 31 add > an upstream port and you have now another 32 ports. > > Thanks, > Marcel Hi Marcel Sorry for the mistake, yes, an upstream support maximum 32 downstream ports, I will close this bug and tried it with nested switches. Thanks Jing