[Bug 1873344] [NEW] KVM Windows 98 sound card passthrough is not working for DOS programs..

[ruthan]

Public bug reported:

Hello,
im trying to passthrough PCI soundcards into Qemu Windows 98 machine - i tried 
Yamaha 724/744 and Aunreal Vortex 1, for Windows 98 its working fine, but for 
Windows 98 dosbox mode its at the best half - working - FM (music) only or 
nothing with detected by games sound setups.
  All there cards are using SB emulation devices. 

  When i try to boot to pure DOS, without Windows 98, even music is not working 
with pass through, only sound which i was able to heard its form Yamaha Setup 
utility test - Native 16bit sound, aby other test, games setup etc.. are able 
to dettect sound cards at all. 
  Im pretty sure that drivers are setup correctly, because im using same setup 
on other physical machine, when its working. My suspect is missing or broken 
Qemu MB DMA channels emulation.. Because its is need to make DOS sound working.

  Im using pass through because, SB16 emulation in Qemu is incomplete
and for Windows 98 dos box, problem is same as with physical cards. Same
with AC97 emulation and its Win95 drivers, which have SB emulation
device fallback..

Qemu 2.11 + 4.2 Linux Mint 19.3. MB Gigabyte Z170.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1873344

Title:
  KVM Windows 98 sound card passthrough is not working for DOS
  programs..

Status in QEMU:
  New

Bug description:
  Hello,
  im trying to passthrough PCI soundcards into Qemu Windows 98 machine - i 
tried Yamaha 724/744 and Aunreal Vortex 1, for Windows 98 its working fine, but 
for Windows 98 dosbox mode its at the best half - working - FM (music) only or 
nothing with detected by games sound setups.
    All there cards are using SB emulation devices. 

    When i try to boot to pure DOS, without Windows 98, even music is not 
working with pass through, only sound which i was able to heard its form Yamaha 
Setup utility test - Native 16bit sound, aby other test, games setup etc.. are 
able to dettect sound cards at all. 
    Im pretty sure that drivers are setup correctly, because im using same 
setup on other physical machine, when its working. My suspect is missing or 
broken Qemu MB DMA channels emulation.. Because its is need to make DOS sound 
working.

    Im using pass through because, SB16 emulation in Qemu is incomplete
  and for Windows 98 dos box, problem is same as with physical cards.
  Same with AC97 emulation and its Win95 drivers, which have SB
  emulation device fallback..

  Qemu 2.11 + 4.2 Linux Mint 19.3. MB Gigabyte Z170.

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