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Bug 2024605 - 6.1.0 introduces regression in q35, unable to add more than 15 pcie-root-ports
Summary: 6.1.0 introduces regression in q35, unable to add more than 15 pcie-root-ports
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: qemu-kvm
Version: CentOS Stream
Hardware: Unspecified
OS: Unspecified
urgent
urgent
Target Milestone: rc
: ---
Assignee: Julia Suvorova
QA Contact: Yiqian Wei
URL:
Whiteboard:
: 2023919 (view as bug list)
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-11-18 12:57 UTC by Yedidyah Bar David
Modified: 2023-04-18 15:42 UTC (History)
22 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-04-18 15:32:14 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


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System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-103159 0 None None None 2021-11-18 13:00:52 UTC

Description Yedidyah Bar David 2021-11-18 12:57:44 UTC 
Description of problem:

[1] https://gitlab.com/qemu-project/qemu/-/issues/641

[2] https://lists.ovirt.org/archives/list/devel@ovirt.org/thread/BDYP62MAJL2QVQZ7RHM2USZD4HXBGUA6/

[3] https://lists.ovirt.org/archives/list/users@ovirt.org/thread/QKRH7PUV6FC2NN5B2G4H5IK7KGXOHZ37/

Version-Release number of selected component (if applicable):
6.1.0

How reproducible:
I think always

Steps to Reproduce:
1. I think this is enough - copying from [1] above:

qemu-system-x86_64 -M q35 -nodefaults \
-device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2 \
-device VGA,bus=pci.1 \
-device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1 \
-device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2 \
-device pcie-root-port,port=0x13,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x3 \
-device pcie-root-port,port=0x14,chassis=6,id=pci.6,bus=pcie.0,addr=0x2.0x4 \
-device pcie-root-port,port=0x15,chassis=7,id=pci.7,bus=pcie.0,addr=0x2.0x5 \
-device pcie-root-port,port=0x16,chassis=8,id=pci.8,bus=pcie.0,addr=0x2.0x6 \
-device pcie-root-port,port=0x17,chassis=9,id=pci.9,bus=pcie.0,addr=0x2.0x7 \
-device pcie-root-port,port=0x18,chassis=10,id=pci.10,bus=pcie.0,multifunction=on,addr=0x3 \
-device pcie-root-port,port=0x19,chassis=11,id=pci.11,bus=pcie.0,addr=0x3.0x1 \
-device pcie-root-port,port=0x1a,chassis=12,id=pci.12,bus=pcie.0,addr=0x3.0x2 \
-device pcie-root-port,port=0x1b,chassis=13,id=pci.13,bus=pcie.0,addr=0x3.0x3 \
-device pcie-root-port,port=0x1c,chassis=14,id=pci.14,bus=pcie.0,addr=0x3.0x4 \
-device pcie-root-port,port=0x1d,chassis=15,id=pci.15,bus=pcie.0,addr=0x3.0x5 \
-device pcie-root-port,port=0x1e,chassis=16,id=pci.16,bus=pcie.0,addr=0x3.0x6

Actual results:
qemu starts, but gets stuck, before outputting even messages from its BIOS

Expected results:
machines boots correctly

Additional info:

Opening this bug following Danilo's suggestion in [3].

IMO this is pretty urgent, can't wait until 8.6 is stabilized. Stream users are already affected. Please consider a revert (to relevant patches, or to qemu 6.0.0 - I realize that both are not easy) if it can't be fixed quickly. Thanks.
Comment 1 Alan Pevec 2021-11-18 13:27:49 UTC 
See CS9 bz https://bugzilla.redhat.com/show_bug.cgi?id=2006409
@virt-maint do you want to move this to a CS8 clone of bug 2006409 ?
Comment 2 Alan Pevec 2021-11-18 13:30:22 UTC 
> @virt-maint do you want to move this to a CS8 clone of bug 2006409 ?

actually there is RHEL 8 bz, should this be marked as a dup of bug 2007129 ?
Comment 3 Yedidyah Bar David 2021-11-22 10:57:19 UTC 
*** Bug 2023919 has been marked as a duplicate of this bug. ***
Comment 4 qing.wang 2021-11-26 01:55:28 UTC 
Hit similar issue on
Red Hat Enterprise Linux release 8.6 Beta (Ootpa)
4.18.0-352.el8.x86_64
qemu-kvm-6.1.0-5.module+el8.6.0+13430+8fdd5f85.x86_64
seabios-bin-1.14.0-1.module+el8.6.0+12861+13975d62.noarch
edk2-ovmf-20210527gite1999b264f1f-3.el8.noarch
virtio-win-prewhql-0.1-214.iso


scenario 1: no "-global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off \"
It can not boot utils only keep 10 pcie-root-port.

scenario 2: add "-global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off \"
It may works 20 pcie-root-port.



/usr/libexec/qemu-kvm \
    -name 'avocado-vt-vm1'  \
    -sandbox on  \
    -machine q35,memory-backend=mem-machine_mem \
    -global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off \
    -device pcie-root-port,id=pcie-root-port-0,multifunction=on,bus=pcie.0,addr=0x1,chassis=1 \
    -device pcie-pci-bridge,id=pcie-pci-bridge-0,addr=0x0,bus=pcie-root-port-0  \
    -nodefaults \
    -device VGA,bus=pcie.0,addr=0x2 \
    -m 30720 \
    -object memory-backend-ram,size=30720M,id=mem-machine_mem  \
    -smp 16,maxcpus=16,cores=8,threads=1,dies=1,sockets=2  \
    -cpu 'EPYC-Rome',+kvm_pv_unhalt \
    \
    -device pcie-root-port,id=pcie-root-port-1,port=0x1,addr=0x1.0x1,bus=pcie.0,chassis=2 \
    -device qemu-xhci,id=usb1,bus=pcie-root-port-1,addr=0x0 \
    -device usb-ehci,id=ehci,bus=pcie.0,addr=0x3 \
    -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
    -device pcie-root-port,id=pcie-root-port-2,port=0x2,addr=0x1.0x2,bus=pcie.0,chassis=3 \
    -device virtio-scsi-pci,id=virtio_scsi_pci0,bus=pcie-root-port-2,addr=0x0 \
    -blockdev node-name=file_image1,driver=file,auto-read-only=on,discard=unmap,aio=threads,filename=/home/kvm_autotest_root/images/rhel840-64-virtio-scsi.qcow2,cache.direct=on,cache.no-flush=off \
    -blockdev node-name=drive_image1,driver=qcow2,read-only=off,cache.direct=on,cache.no-flush=off,file=file_image1 \
    -device scsi-hd,id=image1,drive=drive_image1,bootindex=0,write-cache=on \
    -device pcie-root-port,id=pcie-root-port-3,port=0x3,addr=0x1.0x3,bus=pcie.0,chassis=4 \
    -device virtio-net-pci,mac=9a:05:a8:78:e4:71,id=idV2JV5O,netdev=idhO327p,bus=pcie-root-port-3,addr=0x0  \
    -netdev tap,id=idhO327p,vhost=on  \
    -vnc :5  \
    -monitor stdio \
    -qmp tcp:0:5955,server=on,wait=off \
    -rtc base=utc,clock=host,driftfix=slew  \
    -boot menu=off,order=cdn,once=c,strict=off \
    -enable-kvm \
    -device pcie-root-port,id=pcie_extra_root_port_0,multifunction=on,bus=pcie.0,addr=0x4,chassis=5 \
    -device pcie-root-port,id=pcie_extra_root_port_1,addr=0x4.0x1,bus=pcie.0,chassis=6 \
    -device pcie-root-port,id=pcie_extra_root_port_2,addr=0x4.0x2,bus=pcie.0,chassis=7 \
    -device pcie-root-port,id=pcie_extra_root_port_3,addr=0x4.0x3,bus=pcie.0,chassis=8 \
    -device pcie-root-port,id=pcie_extra_root_port_4,addr=0x4.0x4,bus=pcie.0,chassis=9 \
    -device pcie-root-port,id=pcie_extra_root_port_5,addr=0x4.0x5,bus=pcie.0,chassis=10 \
    -device pcie-root-port,id=pcie_extra_root_port_6,addr=0x4.0x6,bus=pcie.0,chassis=11 \
    -device pcie-root-port,id=pcie_extra_root_port_7,addr=0x4.0x7,bus=pcie.0,chassis=12 \
    -device pcie-root-port,id=pcie_extra_root_port_8,multifunction=on,bus=pcie.0,addr=0x5,chassis=13 \
    -device pcie-root-port,id=pcie_extra_root_port_9,addr=0x5.0x1,bus=pcie.0,chassis=14 \
    -device pcie-root-port,id=pcie_extra_root_port_10,addr=0x5.0x2,bus=pcie.0,chassis=15 \
    -device pcie-root-port,id=pcie_extra_root_port_11,addr=0x5.0x3,bus=pcie.0,chassis=16 \
    -device pcie-root-port,id=pcie_extra_root_port_12,addr=0x5.0x4,bus=pcie.0,chassis=17 \
    -device pcie-root-port,id=pcie_extra_root_port_13,addr=0x5.0x5,bus=pcie.0,chassis=18 \
    -device pcie-root-port,id=pcie_extra_root_port_14,addr=0x5.0x6,bus=pcie.0,chassis=19 \
    -device pcie-root-port,id=pcie_extra_root_port_15,addr=0x5.0x7,bus=pcie.0,chassis=20 \
    -device pcie-root-port,id=pcie_extra_root_port_16,multifunction=on,bus=pcie.0,addr=0x6,chassis=21 \
    -device pcie-root-port,id=pcie_extra_root_port_17,addr=0x6.0x1,bus=pcie.0,chassis=22 \
    -device pcie-root-port,id=pcie_extra_root_port_18,addr=0x6.0x2,bus=pcie.0,chassis=23 \
    -device pcie-root-port,id=pcie_extra_root_port_19,addr=0x6.0x3,bus=pcie.0,chassis=24
Comment 5 Clint Goudie 2021-12-11 22:11:18 UTC 
If you are looking at this post, because you've already upgraded your ovirt hosts (or because you intend to):

If you've already updated to the 6.1.0 version, run dnf downgrade qemu* (multiple times potentially) until you have returned to 6.0.0, which in my case came from the ovirt repo.

Next vi /etc/yum.repos.d/CentOS-Stream-AppStream.repo 

If your file has an exclude line, space separated add qemu* like so: 

exclude=qemu* rsyslog*-8.2102.0-6*

If your file does not have an exclude line add one to the bottom of the file:
exclude=qemu*
Comment 6 Evgeny Slutsky 2022-02-08 10:53:21 UTC 
this also affects ocp-on-rhv installations, currently, we have no way to override the type, and 'Q35 Bios' is the default in our RHCOS templates.
Comment 7 Igor Mammedov 2022-12-14 09:38:01 UTC 
fixed upstream with commit:
  c318bef76206
Comment 15 Yash Mankad 2023-04-18 15:32:14 UTC 
(In reply to Igor Mammedov from comment #7)
> fixed upstream with commit:
>   c318bef76206

VERIFIED by Red Hat Virtualization QE.
The commit that fixes this is present in QEMU 6.2 and in RHEL since 8.6 with qemu-kvm-6.2.0-2.module+el8.6.0+13738+17338784

CLOSING this BZ as CURRENTRELEASE
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