Hello, Many thanks for the prompt reply.
On Mon, Nov 8, 2021 at 8:52 PM Nir Soffer <nsof...@redhat.com> wrote: > On Mon, Nov 8, 2021 at 5:47 PM Gilboa Davara <gilb...@gmail.com> 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.) 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
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