I ended up with a script which generates something like that. It should be q35-4.0.1 AFAIU, but here it is if it useful. I tried to mimic hardware IDs of my host machine at some point, but it should probably be irrelevant. Works fine for Win10. Some of the env are unused on the stock version of qemu-4.2.0 I use this days. The sound is mostly crackle free except when it is initialized in VM. You would need 2 ide-cds to install windows on it, one with virtio-win-0.1.171.iso other with installation media.
export QEMU_AUDIO_DRV=pa export QEMU_PA_SAMPLES=2048 export PULSE_COOKIE=/home/ivan/.config/pulse/cookie export PULSE_SERVER=unix:/home/ivan/.pulse_server export QEMU_AUDIO_TIMER_PERIOD=250 export QEMU_PA_BUFFER_SIZE_OUT=512 export QEMU_PA_TLENGTH=451 export QEMU_PA_MAXLENGTH_OUT=902 export QEMU_PA_ADJUST_LATENCY_OUT=1 /usr/bin/qemu-system-x86_64 -overcommit mem-lock=on -mem-path /dev/qemu-mem -device virtio-balloon -m 16384 -cpu host,kvm=off,hv-vendor-id=servo,hv-vpindex,hv-reset,vme=on,ss=on,f16c=on,rdrand=on,hypervisor=on,arat=on,tsc_adjust=on,umip=on,xsaveopt=on,pdpe1gb=on,abm=on,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff -smp 10,sockets=1,cores=5,threads=2 -machine pc-q35-4.0.1,accel=kvm,usb=off,vmport=off,dump-guest-core=off -enable-kvm -nodefaults -global ICH9-LPC.disable_s3=1 -global ICH9-LPC.disable_s4=1 -boot strict=on -device pcie-root-port,port=1,slot=0,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x1c.0 -device pcie-root-port,port=2,slot=1,chassis=2,id=pci.2,bus=pcie.0,addr=0x1c.1 -device pcie-root-port,port=3,slot=2,chassis=3,id=pci.3,bus=pcie.0,addr=0x1c.2 -device qemu-xhci,p2=15,p3=15,id=usb,bus=pcie.0,addr=0x14 -drive if=pflash,format=raw,readonly,file=/home/ivan/win10/edk2-ovmf-git-20190219/OVMF_CODE.fd,format=raw -drive if=pflash,format=raw,file=/home/ivan/win10/tmp3.vars,format=raw -device usb-kbd,bus=usb.0,port=1 -device usb-mouse,bus=usb.0,port=2 -device usb-host,vendorid=0x0461,productid=0x4d15,bus=usb.0 -device usb-host,vendorid=0x29ea,productid=0x0102,bus=usb.0 -device vfio-pci,host=01:00.0,multifunction=on,bus=pci.1,addr=0.0 -device vfio-pci,host=01:00.1,bus=pci.1,addr=0.1 -device vfio-pci,host=01:00.2,bus=pci.1,addr=0.2 -device vfio-pci,host=01:00.3,bus=pci.1,addr=0.3 -nographic -vga none -device virtio-scsi-pci,id=vv,disable-modern=off,disable-legacy=on,bus=pci.2,addr=0 -drive file=/dev/zvol/ssd/win10b,format=raw,id=disk,if=none,cache=none,aio=threads,discard=unmap -device scsi-hd,drive=disk,bootindex=2,logical_block_size=512,physical_block_size=8192 -drive file=/archive/system/qemu/games/games.raw,format=raw,id=games_disk,if=none,cache=none,aio=threads,discard=unmap -device scsi-hd,drive=games_disk -drive file=/ssd/games_300/games_300.raw,format=raw,id=games_raw_ssd_disk,if=none,cache=none,aio=threads,discard=unmap -device scsi-hd,drive=games_raw_ssd_disk -device virtio-net-pci,netdev=eth0,mac=DE:AD:BE:EF:CE:B9,bus=pci.3,disable-modern=off,disable-legacy=on -netdev bridge,br=brkvm,id=eth0 -device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b -device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0 -no-hpet -rtc base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=discard On Sat, Mar 21, 2020 at 10:57 PM Patrick O'Callaghan <p...@usb.ve> wrote: > > On Sat, 2020-03-21 at 12:10 +0100, Jiri Novak wrote: > > 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? > > You might take a look at: > > https://juho.tykkala.fi/Pulseaudio-and-latency#positive-effect-on-latency > > which has some suggestions regarding buffering and latency. I haven't > got round to trying any of this yet, but I intend to at some point. > > poc > > _______________________________________________ > vfio-users mailing list > vfio-users@redhat.com > https://www.redhat.com/mailman/listinfo/vfio-users > _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
