Bug 2092833
| Summary: | [RFE] Support vDPA live migration in libvirt | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 9 | Reporter: | yalzhang <yalzhang> |
| Component: | libvirt | Assignee: | Eugenio Pérez Martín <eperezma> |
| libvirt sub component: | Networking | QA Contact: | yalzhang <yalzhang> |
| Status: | CLOSED ERRATA | Docs Contact: | |
| Severity: | unspecified | ||
| Priority: | high | CC: | aadam, chaoyang, chayang, eperezma, jasowang, jdenemar, jjongsma, jsuchane, lmen, lvivier, virt-maint, xuzhang |
| Version: | 9.1 | Keywords: | AutomationTriaged, FutureFeature, Triaged |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | libvirt-8.5.0-3.el9 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2022-11-15 10:04:39 UTC | Type: | Feature Request |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
With downstream packages below, test 2 scenarios includeing: 1)try to migrate with vdpa interface(vdpa_sim) -> fail with reasonable error msg 2)try to migrate with vhost-net -> pass The result is as expected. 1)current downstream kernel and qemu do not support vdpa yet, so the result is as expected: # rpm -q libvirt qemu-kvm kernel libvirt-8.5.0-3.el9.x86_64 qemu-kvm-7.0.0-9.el9.x86_64 kernel-5.14.0-136.el9.x86_64 # modprobe vdpa # modprobe vhost_vdpa # modprobe vdpa_sim # modprobe vdpa_sim_net # vdpa mgmtdev show vdpasim_net: supported_classes net max_supported_vqs 2 dev_features MAC ANY_LAYOUT VERSION_1 ACCESS_PLATFORM # vdpa dev add name vdpa0 mgmtdev vdpasim_net mac 00:11:22:33:44:00 # virsh dumpxml rhel --xpath //interface <interface type="vdpa"> <mac address="00:11:22:33:44:00"/> <source dev="/dev/vhost-vdpa-0"/> <model type="virtio"/> <alias name="net0"/> <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/> </interface> # virsh migrate rhel qemu+ssh://xxx/system --live --verbose root@xxx's password: error: Requested operation is not valid: cannot migrate domain: Migration disabled: vhost lacks VHOST_F_LOG_ALL feature. 2) vhost-net can be migrated: # virsh dumpxml rhel --xpath //interface <interface type="network"> <mac address="52:54:00:df:28:e5"/> <source network="default" portid="4569e614-8f12-4787-8831-14b442cc91c4" bridge="virbr0"/> <target dev="vnet0"/> <model type="virtio"/> <alias name="net0"/> <address type="pci" domain="0x0000" bus="0x01" slot="0x00" function="0x0"/> </interface> # virsh migrate rhel qemu+ssh://xxx/system --live --verbose root@xxx's password: Migration: [100 %] Test with latest libvirt-8.5.0-4.el9.x86_64 with vdpa interface: 1) Run save for 2 times: # virsh save rhel rhel.save error: Failed to save domain 'rhel' to rhel.save error: Requested operation is not valid: cannot migrate domain: Migration disabled: vhost lacks VHOST_F_LOG_ALL feature. # virsh save rhel rhel.save error: Failed to save domain 'rhel' to rhel.save error: Requested operation is not valid: cannot migrate domain: Migration disabled: vhost lacks VHOST_F_LOG_ALL feature. 2) migrate: with vdpa interface # virsh migrate rhel qemu+ssh://10.66.146.xx/system --live --verbose root.146.xx's password: error: Requested operation is not valid: cannot migrate domain: Migration disabled: vhost lacks VHOST_F_LOG_ALL feature. with vhost-net: # virsh migrate rhel qemu+ssh://10.66.146.xx/system --live --verbose root.146.xx's password: Migration: [100 %] Hi Eugenio, when I tried to migrate with mlx vdpa, the error msg is like below. It is different from the error msg with vdpa_sim, additional text "; Migration disabled: vhost lacks VHOST_F_LOG_ALL feature." Is that expected? Please help to confirm, Thank you! # virsh migrate test qemu+ssh://xxx.redhat.com/system --live --verbose root.com's password: error: Requested operation is not valid: cannot migrate domain: Migration disabled: vhost lacks VHOST_F_LOG_ALL feature.; Migration disabled: vhost lacks VHOST_F_LOG_ALL feature. (In reply to yalzhang from comment #20) > Hi Eugenio, when I tried to migrate with mlx vdpa, the error msg is like > below. > It is different from the error msg with vdpa_sim, additional text "; > Migration disabled: vhost lacks VHOST_F_LOG_ALL feature." > Is that expected? Please help to confirm, Thank you! > > # virsh migrate test qemu+ssh://xxx.redhat.com/system --live --verbose > root.com's password: > error: Requested operation is not valid: cannot migrate domain: Migration > disabled: vhost lacks VHOST_F_LOG_ALL feature.; Migration disabled: vhost > lacks VHOST_F_LOG_ALL feature. Hi! This is expected, you'll find one message per data virtqueue pair + one message if the guest enabled CVQ on that vdpa device. In the vhost-kernel or vhost-user devices there is no control vq message. Thanks! Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Low: libvirt security, bug fix, and enhancement update), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2022:8003 |
Description of problem: Support vDPA live migration Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. Current libvirt do not support vDPA live migration: # virsh dumpxml rhel | grep /interface -B6 <interface type='vdpa'> <mac address='00:11:22:33:44:00'/> <source dev='/dev/vhost-vdpa-0'/> <model type='virtio'/> <alias name='net0'/> <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/> </interface> # virsh save rhel rhel.save error: Failed to save domain 'rhel' to rhel.save error: Requested operation is not valid: vDPA devices cannot be migrated