Bug 1735375
| Summary: | Introduce virtio-pmem support (libvirt) | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux Advanced Virtualization | Reporter: | Luiz Capitulino <lcapitulino> |
| Component: | libvirt | Assignee: | Michal Privoznik <mprivozn> |
| Status: | CLOSED WONTFIX | QA Contact: | Jing Qi <jinqi> |
| Severity: | low | Docs Contact: | |
| Priority: | medium | ||
| Version: | 8.3 | CC: | dhildenb, dyuan, hhan, jsuchane, knoel, lmen, mprivozn, rbalakri, virt-maint, xuzhang, yalzhang |
| Target Milestone: | rc | Keywords: | FutureFeature, Upstream |
| Target Release: | 8.3 | ||
| Hardware: | x86_64 | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-01-29 14:06:20 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: | |||
| Bug Depends On: | 1735374 | ||
| Bug Blocks: | |||
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Description
Luiz Capitulino
2019-07-31 20:48:22 UTC
Just a note, Pankaj will soon start a thread in libvirt-devel to get the ball rolling on upstream. Merged upstream: 6cf2ce8e8b qemu: Build command line for virtio-pmem 5b4b8dd1e2 qemu: Create virtio-pmem in namespace a536873d82 qemu: Allow virtio-pmem in CGroups 5259748a9f security: Relabel virtio-pmem 173733b7a8 conf: Introduce virtio-pmem <memory/> model f06c1d908f qemu_capabilities: Introduce QEMU_CAPS_DEVICE_VIRTIO_PMEM_PCI v7.0.0-33-g6cf2ce8e8b Verified in libvirt upstream v7.0.0-157-g85be8e3d74
& qemu-5.1.0-9.fc33.x86_64
S1: Start domain with memory device using "virtio-pmem" driver
steps:
1. #mkdir /tmp/virtio_pmem
2. In domain configuration, add below part -
<memory model='virtio-pmem' access='shared'>
<source>
<path>/tmp/virtio_pmem</path>
</source>
<target>
<size unit='KiB'>524288</size>
</target>
<alias name='virtiopmem0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/>
</memory>
3. Start domain-
#virsh start pc
Domain 'pc' started
4. Checking qemu cmdline -
-object memory-backend-file,id=memvirtiopmem0,mem-path=/tmp/virtio_pmem,share=yes,size=536870912 -device virtio-pmem-pci,memdev=memvirtiopmem0,id=virtiopmem0,bus=pci.0,addr=0xa
virtio-pmem still has a known preflush issue in the upstream kernel, which has to be sorted out upstream first. As the author of virtio-pmem is no longer working at Red Hat, we won't be supporting virtio-pmem in RHEL8 and will disable it in RHEL9 until we have an upstream fix. Until then, we really can't test and support this in QEMU. |