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Bug 894287 - Pci-assign fails on q35 machine type
Summary: Pci-assign fails on q35 machine type
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: x86_64
OS: Linux
high
high
Target Milestone: rc
: ---
Assignee: Alex Williamson
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-01-11 10:18 UTC by xhan
Modified: 2014-06-18 08:08 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-11-27 15:53:27 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description xhan 2013-01-11 10:18:01 UTC 
Description of problem:

Pci-assign failed on RHEL7.0 and qemu-kvm 1.3.0.

Version-Release number of selected component (if applicable):



How reproducible:

100%

Steps to Reproduce:
1. Install RHEL7.0 and update to 
   kernel( kernel-3.7.0-0.30.el73.7) 
   seabios (seabios-1.7.2-0.2.gita810e4e7.el7) 
   qemu (qemu-kvm-1.3.0-3.el7)

2. start qemu-kvm guest with pci-assign for NIC.

/usr/libexec/qemu-kvm -nodefaults -device ich9-usb-uhci1,id=usb1,bus=pcie.0,addr=0x4 -drive file=/root/workspace/imgs/rhel7.img.qcow2,if=none,id=drive-virtio-disk1,media=disk,cache=unsafe,snapshot=off,format=qcow2,aio=native -device virtio-blk-pci,bus=pcie.0,addr=0x5,drive=drive-virtio-disk1,id=virtio-disk1 -device pci-assign,host=00:19.0,id=xmhannic0 -m 2G -smp 2,sockets=2,cores=1,threads=1 -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 -vnc :0 -vga cirrus -rtc base=utc,clock=host,driftfix=slew -boot order=cdn,once=c,menu=off -no-shutdown -enable-kvm -monitor stdio -qmp tcp:0:4444,server,nowait -M q35 -acpitable file=/root/workspace/seabios/seabios/out/q35-acpi-dsdt.aml -mem-path 
/mnt/kvm_hugepage

3. qemu-kvm prompts error:
   qemu-kvm: PCI: Bug - unimplemented PCI INTx routing (q35-pcihost)
  
Actual results:
PCI can not be initialized correctly.

Expected results:

PCI device can be assigned.

Additional info:
Comment 1 xhan 2013-01-11 10:30:31 UTC 
Before executing the step2(start guest with NIC pass-through) need unbind the host network card :

echo "8086 1502" > /sys/bus/pci/drivers/pci-stub/new_id
echo 0000:00:19.0 > /sys/bus/pci/devices/0000:00:19.0/driver/unbind
echo 0000:00:19.0 > /sys/bus/pci/drivers/pci-stub/bind
Comment 2 Alex Williamson 2013-01-15 16:25:02 UTC 
As noted in the error log, the q35 machine type does not yet implement the INTx routing callback necessary for pci-assign.
Comment 3 juzhang 2013-01-28 07:35:18 UTC 
According to comment2, add block flag. Currently, can not do pci assign feature.
Comment 5 Alex Williamson 2013-11-27 15:53:27 UTC 
pci-assign is not supported on rhel7.  I suspect this issue has already been fixed, but there's no way to test it on current builds.  vfio-pci does not have this problem.
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