Hi everyone,
I'll attempt to start with enough info to describe my situation without
pasting a complete `lspci -vvvxxx` output etc.
My special sound card doesn't want to work when passed through to a guest.
The card is a Creative "X-Fi Titanium Fatal1ty Pro" (1102:000b), and the
mobo is an Asus "TUF Gaming X570 Plus (Wi-Fi)".
I have already had much success passing through multiple other PCIe
devices, including the primary GPU with its HDMI audio, 2 USB
controllers and a SATA controller, so I think I have the general process
down. The VM's base is pc-i440fx-3.1, running under libvirt.
So when I attempt to use the card in the guest, within the first few
minutes of running the host goes:
Feb 13 11:48:01 mickpc-bullseye kernel: [13186.228134] irq 98: nobody
cared (try booting with the "irqpoll" option)
[snip]
Feb 13 11:48:01 mickpc-bullseye kernel: [13186.228199] handlers:
Feb 13 11:48:01 mickpc-bullseye kernel: [13186.228202]
[<000000009b052715>] vfio_intx_handler [vfio_pci]
Feb 13 11:48:01 mickpc-bullseye kernel: [13186.228203] Disabling IRQ #98
Then sound stops working for *some* clients on the guest (including
pulseaudio). The sound goes choppy, as if it's playing each 0.2s of
audio 4-5 times.
I think i tried irqpoll a while back with no luck (From my understanding
of what it does, it won't help here anyway)
I have tried multiple kernel versions on both host and guest (haven't
tried 5.5 yet though).
/proc/interrupts on the host says:
98: 0 0 0 0 0 0
400000 0 IR-IO-APIC 7-fasteoi vfio-intx(0000:04:00.0)
And on the guest:
11: 0 7110 0 0 0 0
0 0 IO-APIC 11-fasteoi virtio3, uhci_hcd:usb1, snd_ctxfi
This is the only device whose interrupt is MSI on the host and not on
the guest, and also the only device which is sharing interrupts with
other devices on the guest.
Can anyone could shed some light on what is actually happening here and
how it could be fixed?
FYI, the PCI config dump of the card on the host, in case it helps:
04:00.0 Audio device: Creative Labs EMU20k2 [Sound Blaster X-Fi Titanium
Series] (rev 03)
00: 02 11 0b 00 06 01 10 00 03 00 03 04 10 00 00 00
10: 04 00 20 f4 00 00 00 00 04 00 00 f4 00 00 00 00
20: 04 00 00 f0 00 00 00 00 00 00 00 00 02 11 43 00
30: 00 00 00 00 40 00 00 00 00 00 00 00 0f 01 00 00
40: 01 48 03 00 00 00 00 00 05 58 80 00 00 00 00 00
50: 00 00 00 00 00 00 00 00 10 00 02 00 00 80 00 00
60: 10 28 00 00 11 0c 00 00 00 00 11 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 0f 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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