Bug 802856
| Summary: | Missing support for persistent hotplug attach/detach of <hostdev> devices | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | Laine Stump <laine> |
| Component: | libvirt | Assignee: | Laine Stump <laine> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 6.2 | CC: | acathrow, ajia, dallan, dyuan, honzhang, mshao, mzhan, rwu, weizhan |
| Target Milestone: | rc | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | libvirt-0.9.10-6.el6 | Doc Type: | Bug Fix |
| Doc Text: |
In previous versions of RHEL, a <hostdev> device could be hotplugged to a guest, but making that device persistent across restarts of the guest required separately editing the guest configuration. The patch that closes this bug adds support for persistent hotplug of <hostdev> devices, both to the libvirt API and to the virsh commandline utility.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-06-20 06:50:17 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
A backported fix has been posted to rhvirt-patches for inclusion in the RHEL build of libvirt: http://post-office.corp.redhat.com/archives/rhvirt-patches/2012-March/msg01461.html Use libvirt-0.9.10-2.el6.x86_64 to reproduce the bug. #virsh attach-device rhel6 hostdev.xml --persistent error: Failed to attach device from hostdev.xml error: unsupported configuration:persistent attach of device is not supported. Verify steps 1.enable kernel iommu. edit grub.conf add intel_iommu=on at the end of kernel line. 2.For platform just support vt-d1(host kernel) and host kernel larger than 171 kernel, do the following steps. modprobe -r kvm_intel modprobe -r kvm modprobe kvm allow_unsafe_assigned_interrupts=1 modprobe kvm_intel 3.# rpm -q libvirt libvirt-0.9.10-6.el6.x86_64 4.Check device list, prepare hotplug network from host to guest. computer | +- pci_0000_00_19_0 | | | +- net_eth0_44_37_e6_67_11_a2 4.# virsh nodedev-dumpxml pci_0000_00_19_0 5. Prepare hostdev.xml that like as following <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x00' slot='0x19' function='0x0'/> </source> </hostdev> 5.# virsh attach-device rhel6 hostdev.xml --persistent Device attached successfully 6. In guest, using lspci, and ping to check the host network device is working fine. 7. # virsh destroy rhel6 8. # virsh start rhel6 9. The host network device still works fine in guest. 10. # virsh detach-device rhel6 hostdev.xml --persistent Device detached successfully The host network device automatically be re-attached to host. 11. # virsh destroy rhel6 12. # virsh start rhel6 Results The host network device don't exist in guest. So it is verified.
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In previous versions of RHEL, a <hostdev> device could be hotplugged to a guest, but making that device persistent across restarts of the guest required separately editing the guest configuration. The patch that closes this bug adds support for persistent hotplug of <hostdev> devices, both to the libvirt API and to the virsh commandline utility.
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, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2012-0748.html |
Fixed in this upstream commit: commit edb6fc3a7f0de4a4881862287b412b66b8153768 Author: Laine Stump <laine> Date: Wed Mar 7 16:05:34 2012 -0500 qemu: support persistent hotplug of <hostdev> devices For some reason, although live hotplug of <hostdev> devices is supported, persistent hotplug is not. This patch adds the proper VIR_DOMAIN_DEVICE_HOSTDEV cases to the switches in qemuDomainAttachDeviceConfig and qemuDomainDetachDeviceConfig.