Hi, this might not be the answer you are looking for, but i set up audio from my windows vm using scream (https://github.com/duncanthrax/scream) via a ivshmem device. This is technical comparable to what looking glass is using (https://looking-glass.hostfission.com/).
It works much better than my previous HDA ICH6 sound device, no crackeling and much lower latency and might copletely circumvent your problem :) Guide: https://looking-glass.hostfission.com/wiki/Using_Scream Mar 21, 2020, 12:10 by jiri.no...@ghorland.net: > Hello, > > after some time, iv;e decided to try again gpu passthrough. i tried to > resue my old vm, which was done on i440fx-2.1, but had issue with > crackling audio, apart from that, it works fine. as upgrade to 3.0 break > windows license, i;ve decided to do it anew on q35, but more on that > later. i;ve went back to some experineting with the i440fx and with > recent qemu, 4.2, kernel 5.4 (debian bullseye), i have clear audio on > i440fx-3.0, but it breaks again on 3.1. same on 4.2 any ideas? > > the audio line is -audiodev pa,id=pa1,server=/run/pulse/native > -device intel-hda,id=sound4,bus=pci.2,addr=0x3 -device > hda-duplex,id=sound4-codec0,bus=sound4.0,cad=0,audiodev=pa1 \ > > > > regarding that upgrade to q35, i wanted to go to as new version as > possible, so ideally q35-4.2 to be future proof for some time with the > windows license again as i have to relicense it. i tried to setup the > pcie structure explicitly manually and failed hard. i'm using qemu+kvm, > no libvirt. > > if i attach all devices (both passed through and directly to pcie.0, > they will work, aparyh fro GPU with error 43, as it's not initialised > properly. > > if i put them behind pcie-root-port device, they fail with code 10 (both > gpu and virtio devices. gpu works in vga mode, virtio devices don't work > at all, both net and storage, no disks show up) > > if i understood the docs right, i should be putting pci devices behind > pcie-to-pci + pci-pci bridge, but that makes them completely undetected > and don't show up at all (same for virtio devices if i put them there) > > so i think 'im missing something completely essential, even after full > day of googling example configuration on net (most of them are at best > around q-35-3.0 machine types though)... does anyone have this working > on q35-4.2 machine? > > > thanks, > > Gh. > _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
