QEMU/KVM and GPU Passthrough Troubleshooting

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Guest GPU Au­dio Crack­ling and IRQ xx: No­body Cared Fix

Win­dows

The so­lu­tion of the is­sue Guest GPU HD­MI Au­dio Crack­ling, Bro­ken or Los­ing is well ex­plained by Jonp at UN­RAID Fo­rums. In short we must try to en­able the MSI – Mes­sage Sig­naled In­ter­rupts op­tion if the de­vice sup­port it. Here is a de­tailed step-by-step in­struc­tion how to do that.

  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 1: Open Device Manager and from the View menu switch to Resources by type.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 1: Open De­vice Man­ag­er and from the View menu switch to Re­sources by type.
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 2: Expand the section Interrupt request (IRQ).
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 2: Ex­pand the sec­tion In­ter­rupt re­quest (IRQ).
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 3: Find the problematic audio device and by the context menu choice Properties.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 3: Find the prob­lem­at­ic au­dio de­vice and by the con­text menu choice Prop­er­ties.
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 4: Within the Details tab witch to Property Device instance path.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 4: With­in the De­tails tab witch to Prop­er­ty De­vice in­stance path.
  • QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 5: In this par­tic­u­lar case the Val­ue is PCI­\­VEN­_­10­DE­&­DEV­_­0E­08­&­SUB­SYS­_­102­F10­DE­&­REV­_­A1­\­4&­29­fcb­422­&0­&00­16. This is a re­la­ti­ve path to Com­pu­ter­\­HKEY­_­LO­CAL­_­MA­CHI­NE­\­SYS­TEM­\­Cur­rent­Con­trol­Set­\­Enum in the Win­dows 10's regis­try.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 5: In this par­tic­u­lar case the Val­ue is PCI­\­VEN­_­10­DE­&­DEV­_­0E­08­&­SUB­SYS­_­102­F10­DE­&­REV­_­A1­\­4&­29­fcb­422­&0­&00­16. This is a re­la­ti­ve path to Com­pu­ter­\­HKEY­_­LO­CAL­_­MA­CHI­NE­\­SYS­TEM­\­Cur­rent­Con­trol­Set­\­Enum in the Win­dows 10's regis­try.
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 6: Run Registry Editor as Administrator.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 6: Run Reg­istry Ed­i­tor as Ad­min­is­tra­tor.
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 7: In the Registry Editor tool, paste Com­pu­ter­\­HKEY­_­LO­CAL­_­MA­CHI­NE­\­SYS­TEM­\­Cur­rent­Con­trol­Set­\­Enum in the path line and hit Enter.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 7: In the Reg­istry Ed­i­tor tool, paste Com­pu­ter­\­HKEY­_­LO­CAL­_­MA­CHI­NE­\­SYS­TEM­\­Cur­rent­Con­trol­Set­\­Enum in the path line and hit En­ter.
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 8: In Device Manager, use the context menu and Copy the Value of the target Device instance path.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 8: In De­vice Man­ag­er, use the con­text menu and Copy the Val­ue of the tar­get De­vice in­stance path.
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 9: In Registry Editor append one backslash to the path and Paste the Value.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 9: In Reg­istry Ed­i­tor ap­pend one back­slash to the path and Paste the Val­ue.
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 10: In Registry Editor, navigate to \Device Parameters\Interrupt Ma­na­ge­ment\Me­ssa­ge­Sig­na­led­In­ter­rupt­Pro­per­ties.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 10: In Reg­istry Ed­i­tor, nav­i­gate to \De­vice Parameters\Interrupt Ma­na­ge­ment\Me­ssa­ge­Sig­na­led­In­ter­rupt­Pro­per­ties.
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 11: Then choose Modify from the context menu the Value of the DWORD Key MSISupported (MSI – Message Signaled Interrupts).
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 11: Then choose Mod­i­fy from the con­text menu the Val­ue of the DWORD Key MSISup­port­ed (MSI – Mes­sage Sig­naled In­ter­rupts).
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 12: Change the Value of the DWORD Key MSISupported to 1 [0x0..01].
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 12: Change the Val­ue of the DWORD Key MSISup­port­ed to 1 [0x0..01].
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 13: Confirm the change of the DWORD Key MSISupported (MSI – Message Signaled Interrupts).
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 13: Con­firm the change of the DWORD Key MSISup­port­ed (MSI – Mes­sage Sig­naled In­ter­rupts).
  • QEMU KVM Windows Guest Fix NVIDIA NVS 315 HDMI Audio Step 14: Reboot the guest Operating system.
    QE­MU KVM Win­dows Guest Fix NVIDIA NVS 315 HD­MI Au­dio Step 14: Re­boot the guest Op­er­at­ing sys­tem.

I was men­tioned the ker­nel com­mand irqpool as so­lu­tion for this is­sue, but in my opin­ion and ac­cord­ing to some oth­er posts, pro­vid­ed in the ref­er­ences sec­tion, this set­ting is an ac­tu­al so­lu­tion for the prob­lem irq 44: no­body cared (try boot­ing with the "irqpool" op­tion); han­dlers: vfio_​​​intx_​​​handler; Dis­abling IRQ #44, that ap­pears at my sys­tem when boot­ing a VM with GPU passthrough with a dis­play at­tached to it, which was caus­ing host sys­tem re­boot.

Lin­ux

Lin­ux guests usu­al­ly en­able MSI by them­selves. To force use of MSI for GPU au­dio de­vices, use the fol­low­ing com­mand and re­boot. 

sudo lspci -nnv -s 02:00
  • Note the lines Ker­nel dri­ver in use: vfio-pci
#Out­put
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF119 [NVS 315] [10de:107c] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: NVIDIA Corporation GF119 [NVS 315] [10de:102f]
        Physical Slot: 1
        Flags: bus master, fast devsel, latency 0, IRQ 255, NUMA node 0
        Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
        Memory at 23ff0000000 (64-bit, prefetchable) [size=128M]
        Memory at 23ff8000000 (64-bit, prefetchable) [size=32M]
        I/O ports at d000 [size=128]
        Expansion ROM at fb000000 [disabled] [size=512K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Endpoint, MSI 00
        Capabilities: [b4] Vendor Specific Information: Len=14 <?>
        Capabilities: [100] Virtual Channel
        Capabilities: [128] Power Budgeting <?>
        Capabilities: [600] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
        Kernel driver in use: vfio-pci
        Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia

02:00.1 Audio device [0403]: NVIDIA Corporation GF119 HDMI Audio Controller [10de:0e08] (rev a1)
        Subsystem: NVIDIA Corporation GF119 HDMI Audio Controller [10de:102f]
        Physical Slot: 1
        Flags: fast devsel, IRQ 255, NUMA node 0
        Memory at fb080000 (32-bit, non-prefetchable) [disabled] [size=16K]
        Capabilities: [60] Power Management version 3
        Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
        Capabilities: [78] Express Endpoint, MSI 00
        Kernel driver in use: vfio-pci
        Kernel modules: snd_hda_intel

Ref­er­ences

Hide the Warn­ings KVM: vcpu0 ig­nored rdm­sr

sudo nano /etc/modprobe.d/kvm.conf

options kvm report_ignored_msrs=0 # Or: GRUB_CMDLINE_LINUX_DEFAULT="... kvm.report_ignored_msrs=0 ..."

sudo update-initramfs -u -k all
  • Note, ac­cord­ing to my ex­pe­ri­ence, this op­tion may cause crash­es of the host sys­tem!?

Ref­er­ences

KVM Mod­e­in­fo

modinfo kvm

filename:       /lib/modules/5.4.0-77-generic/kernel/arch/x86/kvm/kvm.ko
license:        GPL
author:         Qumranet
srcversion:     20C68083F39E14AB616D0B8
depends:
retpoline:      Y
intree:         Y
name:           kvm
vermagic:       5.4.0-77-generic SMP mod_unload modversions
sig_id:         PKCS#7
signer:         Build time autogenerated kernel key
sig_key:        67:66:2F:F8:26:8F:56:E9:37:7F:B7:AD:33:FA:97:31:CA:7F:FF:50
sig_hashalgo:   sha512
signature:      6C:0B:65:F9:46:AC:D8:B7:94:E8:B9:9D:A0:4B:97:E6:63:52:5A:FF:
                ...
parm:           nx_huge_pages:bool
parm:           nx_huge_pages_recovery_ratio:uint
parm:           ignore_msrs:bool
parm:           report_ignored_msrs:bool
parm:           min_timer_period_us:uint
parm:           kvmclock_periodic_sync:bool
parm:           tsc_tolerance_ppm:uint
parm:           lapic_timer_advance_ns:int
parm:           vector_hashing:bool
parm:           enable_vmware_backdoor:bool
parm:           force_emulation_prefix:bool
parm:           pi_inject_timer:bint
parm:           halt_poll_ns:uint
parm:           halt_poll_ns_grow:uint
parm:           halt_poll_ns_grow_start:uint
parm:           halt_poll_ns_shrink:uint
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