[ovirt-users] Re: Viewing and hopefully, modifying the VM's qemu command line

Many thanks! Somehow my Google-fu skills (and DDG-Fu skills) missed this bug report. I wonder if 4.4.9 will fix the sporadic -ENOMEM (1) that I'm getting under Q35... Thanks, - Gilboa (1) 2021-11-05T13:13:06.290874Z qemu-kvm: -device vfio-pci,host=0000:07:00.0,id=ua-a3048786-da87-425f-83e6-51afbb906423,bus=pci.10,addr=0x0: VFIO_MAP_DMA failed: Cannot allocate memory 2021-11-05T13:13:06.362210Z qemu-kvm: -device vfio-pci,host=0000:07:00.0,id=ua-a3048786-da87-425f-83e6-51afbb906423,bus=pci.10,addr=0x0: VFIO_MAP_DMA failed: Cannot allocate memory 2021-11-05T13:13:06.362609Z qemu-kvm: -device vfio-pci,host=0000:07:00.0,id=ua-a3048786-da87-425f-83e6-51afbb906423,bus=pci.10,addr=0x0: vfio 0000:07:00.0: failed to setup container for group 33: memory listener initialization failed: Region ram-node0: vfio_dma_map(0x55fe05d647f0, 0xc0000, 0x7ff40000, 0x7f821fec0000) = -12 (Cannot allocate memory) 2021-11-05 13:13:06.580+0000: shutting down, reason=failed On Tue, Nov 9, 2021 at 3:29 PM Arik Hadas <ahadas(a)redhat.com&gt; wrote: > > > On Tue, Nov 9, 2021 at 11:57 AM Gilboa Davara <gilboad(a)gmail.com&gt; wrote: > >> (Sorry: Pressed send too fast...) >> 3. I'm facing some odd memory allocation issues (only if the VM is Q35, >> all works well if the VM is configured as i440fx), which may require me to >> change additional VM parameters. >> >> BTW, ironically, the two other hosts in the same cluster, with older >> MBs, have zero issues with GPU/Audio/USB passthrough...) >> >> - Gilboa >> >> On Tue, Nov 9, 2021 at 11:52 AM Gilboa Davara <gilboad(a)gmail.com&gt; wrote: >> >>> Hello, >>> >>> Many thanks for the prompt reply. >>> >>> On Mon, Nov 8, 2021 at 8:52 PM Nir Soffer <nsoffer(a)redhat.com&gt; wrote: >>> >>>> On Mon, Nov 8, 2021 at 5:47 PM Gilboa Davara <gilboad(a)gmail.com&gt; >>>> wrote: >>>> > >>>> > Hello all, >>>> > >>>> > I'm setting up a fairly (?) complex oVirt over Gluster setup built >>>> around 3 Xeon servers-turned-into-workstations, each doubling as oVirt node >>>> + one primary Fedora VM w/ a dedicated passthrough GPU (+audio and a couple >>>> of USB root devices). >>>> > One of the servers seems to have some weird issue w/ the passthrough >>>> nVidia GPU that seems to require me to edit the VM iommu (1) and >>>> passthrough device (2) command line. >>>> > I tried using the qemu-cmdline addon to add the missing parameters, >>>> but it seems that qemu treats the added parameters as an additional device >>>> / iommu instead of editing the existing parameters. >>>> > >>>> > So: >>>> > 1. How can I view the VM qemu command line? >>>> >>>> less /var/log/libvirt/qemu/vm-name.log >>>> >>> >>> Found it, thanks! >>> >>> >>>> > 2. Can I somehow manually edit the qemu command line, either >>>> directly or by somehow adding parameters in the HE XML file? >>>> >>>> I think this should be possible via vdsm hook, but hooks are bad. >>>> Can you explain what do you want to change? >>>> >>>> Nir >>>> >>> >>> 1. IOMMU: >>> -device intel-iommu,intremap=on,eim=on >>> To (Add: caching-mode=on, per qemu log message) >>> -device intel-iommu,intremap=on,eim=on,caching-mode=on >>> (2021-11-05T18:42:36.651191Z qemu-kvm: We need to set caching-mode=on >>> for intel-iommu to enable device assignment with IOMMU protection.) >>> >> > Note that this one should be fixed in the latest ovirt-engine > (ovirt-engine-4.4.9.4) - > https://bugzilla.redhat.com/show_bug.cgi?id=2013752 > > >> >>> 2. Device: >>> -device >>> vfio-pci,host=0000:84:00.0,id=ua-c774115b-c0ee-43a5-97c8-12ac73cb6f3a,bus=pci.10,addr=0x0 >>> >>> -device >>> vfio-pci,host=0000:84:00.1,id=ua-3c7d3b66-57aa-470b-afc8-78383ac9a025,bus=pci.8,addr=0x0 >>> To (Attach hdmi sound as function of GPU, possibly add x-vga=on): >>> -device >>> vfio-pci,host=0000:84:00.0,id=ua-c774115b-c0ee-43a5-97c8-12ac73cb6f3a,bus=pci.8.0,x-vga=on,addr=0x0 >>> >>> -device >>> vfio-pci,host=0000:84:00.1,id=ua-3c7d3b66-57aa-470b-afc8-78383ac9a025,bus=pci.8.1,addr=0x0 >>> >>> 3. I'm facing some odd memory allocation issues (only if the VM is Q35, >>> all works well if the VM is configured as i440fx), which may req >>> >> _______________________________________________ >> Users mailing list -- users(a)ovirt.org >> To unsubscribe send an email to users-leave(a)ovirt.org >> Privacy Statement: https://www.ovirt.org/privacy-policy.html >> oVirt Code of Conduct: >> https://www.ovirt.org/community/about/community-guidelines/ >> List Archives: >> https://lists.ovirt.org/archives/list/users@ovirt.org/message/XKZLE6ZEU7Z... >> >