Bug 1832850
| Summary: | Hot-plug interface into the pcie-downstream-port controller will disappear after a while | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | yalzhang <yalzhang> |
| Component: | qemu-kvm | Assignee: | Amnon Ilan <ailan> |
| qemu-kvm sub component: | PCI | QA Contact: | jingzhao <jinzhao> |
| Status: | CLOSED WONTFIX | Docs Contact: | |
| Severity: | unspecified | ||
| Priority: | unspecified | CC: | jinzhao, jsuvorov, jusual, juzhang, laine, meili, virt-maint |
| Version: | 8.2 | ||
| Target Milestone: | rc | ||
| Target Release: | 8.0 | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-07-05 08:59:57 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Assigned to Amnon for initial triage per bz process and age of bug created or assigned to virt-maint without triage I'm pretty sure this behavior was reported in a previous BZ - basically the pcie-downstream-port is for some reason unplugged by the Linux kernel some time after the guest OS boots. I don't know if this is a problem with the emulated controller in qemu, or with the guest kernel (seems more likely the former). |
Description of problem: Hot-plug interface into the pcie-downstream-port controller will disappear after a while Version-Release number of selected component (if applicable): # rpm -q libvirt qemu-kvm libvirt-6.0.0-18.module+el8.2.1+6456+a6d62e4e.x86_64 qemu-kvm-4.2.0-20.module+el8.2.1+6467+49dc3278.x86_64 It can also be reproduced on rhel8.2.0 av: # rpm -q libvirt-libs qemu-kvm libvirt-libs-6.0.0-17.module+el8.2.0+6257+0d066c28.x86_64 qemu-kvm-4.2.0-19.module+el8.2.0+6296+6b821950.x86_64 How reproducible: 100% Steps to Reproduce: 1. Prepare an vm with pcie-switch-upstream-port and pcie-switch-downstream-port controller: # virsh dumpxml vm2 ... <controller type='pci' index='0' model='pcie-root'/> ... <controller type='pci' index='7' model='pcie-root-port'> <model name='pcie-root-port'/> <target chassis='7' port='0x16'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x6'/> </controller> <controller type='pci' index='8' model='pcie-switch-upstream-port'> <model name='x3130-upstream'/> <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/> </controller> <controller type='pci' index='9' model='pcie-switch-downstream-port'> <model name='xio3130-downstream'/> <target chassis='9' port='0x0'/> <address type='pci' domain='0x0000' bus='0x08' slot='0x00' function='0x0'/> </controller> ... 2. Start the vm, hotplug interface to the downstream port: # virsh start vm2 # cat net.xml <interface type='network'> <mac address='52:54:11:22:33:44'/> <source network='default'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x09' slot='0x00' function='0x0'/> </interface> # virsh domiflist vm2 Interface Type Source Model MAC ------------------------------------------------------------- vnet0 network default virtio 52:54:00:86:f7:83 # virsh attach-device vm2 net.xml ; virsh domiflist vm2 ; sleep 5; echo "after sleep 5"; virsh domiflist vm2 Device attached successfully Interface Type Source Model MAC ------------------------------------------------------------- vnet0 network default virtio 52:54:00:86:f7:83 vnet1 network default virtio 52:54:11:22:33:44 after sleep 5 Interface Type Source Model MAC ------------------------------------------------------------- vnet0 network default virtio 52:54:00:86:f7:83 3. check on guest, there are error prompted: [root@localhost ~]# [ 740.394901] pcieport 0000:08:00.0: Slot(0-7): Attention button pressed [ 740.399225] pcieport 0000:08:00.0: Slot(0-7) Powering on due to button press [ 740.403163] pcieport 0000:08:00.0: Slot(0-7): Card present [ 740.405830] pcieport 0000:08:00.0: Slot(0-7): Link Up [ 741.536309] pcieport 0000:08:00.0: link training error: status 0x2000 [ 741.539890] pcieport 0000:08:00.0: Failed to check link status Actual results: In step2, the interface disappeared after hotplug successfully Expected results: The interface should not disappear on the guest. If the hotplug is not supported, it should report error during hotplug Additional info: