I also have this issue, unable to get onboard BT working in VM.
Intel Corporation Wi-Fi 6 AX210/AX211/AX411 160MHz (rev 1a) is the onboard PCI device, which is completely passed through and the WIFI component works.
PCI Devices and IOMMU Groups
IOMMU group 0: [8086:9b33] 00:00.0 Host bridge: Intel Corporation Device 9b33 (rev 05)
IOMMU group 1: [8086:1901] 00:01.0 PCI bridge: Intel Corporation 6th-10th Gen Core Processor PCIe Controller (x16) (rev 05)
IOMMU group 2: [8086:1905] 00:01.1 PCI bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x8) (rev 05)
IOMMU group 3: [8086:9bc5] 00:02.0 VGA compatible controller: Intel Corporation CometLake-S GT2 [UHD Graphics 630] (rev 05)
IOMMU group 4: [8086:43ed] 00:14.0 USB controller: Intel Corporation Tiger Lake-H USB 3.2 Gen 2x1 xHCI Host Controller (rev 11)
This controller is bound to vfio, connected USB devices are not visible.
[8086:43ef] 00:14.2 RAM memory: Intel Corporation Tiger Lake-H Shared SRAM (rev 11)
IOMMU group 5: [8086:43e8] 00:15.0 Serial bus controller [0c80]: Intel Corporation Tiger Lake-H Serial IO I2C Controller #0 (rev 11)
[8086:43e9] 00:15.1 Serial bus controller [0c80]: Intel Corporation Device 43e9 (rev 11)
IOMMU group 6: [8086:43e0] 00:16.0 Communication controller: Intel Corporation Tiger Lake-H Management Engine Interface (rev 11)
IOMMU group 7: [8086:43d2] 00:17.0 SATA controller: Intel Corporation Device 43d2 (rev 11)
[2:0:0:0] disk ATA ST8000VN004-2M21 SC60 /dev/sdb 8.00TB
[4:0:0:0] disk ATA Samsung SSD 870 1B6Q /dev/sdc 1.00TB
[5:0:0:0] disk ATA Samsung SSD 860 4B6Q /dev/sdd 1.00TB
IOMMU group 8: [8086:43c0] 00:1b.0 PCI bridge: Intel Corporation Device 43c0 (rev 11)
IOMMU group 9: [8086:43b8] 00:1c.0 PCI bridge: Intel Corporation Device 43b8 (rev 11)
IOMMU group 10: [8086:43bd] 00:1c.5 PCI bridge: Intel Corporation Device 43bd (rev 11)
IOMMU group 11: [8086:43be] 00:1c.6 PCI bridge: Intel Corporation Device 43be (rev 11)
IOMMU group 12: [8086:43bf] 00:1c.7 PCI bridge: Intel Corporation Device 43bf (rev 11)
IOMMU group 13: [8086:43b0] 00:1d.0 PCI bridge: Intel Corporation Tiger Lake-H PCI Express Root Port #9 (rev 11)
IOMMU group 14: [8086:4385] 00:1f.0 ISA bridge: Intel Corporation Device 4385 (rev 11)
[8086:f0c8] 00:1f.3 Audio device: Intel Corporation Device f0c8 (rev 11)
[8086:43a3] 00:1f.4 SMBus: Intel Corporation Tiger Lake-H SMBus Controller (rev 11)
[8086:43a4] 00:1f.5 Serial bus controller [0c80]: Intel Corporation Tiger Lake-H SPI Controller (rev 11)
IOMMU group 15: [10de:1e81] 01:00.0 VGA compatible controller: NVIDIA Corporation TU104 [GeForce RTX 2080 SUPER] (rev a1)
IOMMU group 16: [10de:10f8] 01:00.1 Audio device: NVIDIA Corporation TU104 HD Audio Controller (rev a1)
IOMMU group 17: [10de:1ad8] 01:00.2 USB controller: NVIDIA Corporation TU104 USB 3.1 Host Controller (rev a1)
This controller is bound to vfio, connected USB devices are not visible.
IOMMU group 18: [10de:1ad9] 01:00.3 Serial bus controller [0c80]: NVIDIA Corporation TU104 USB Type-C UCSI Controller (rev a1)
IOMMU group 19: [1b73:1100] 02:00.0 USB controller: Fresco Logic FL1100 USB 3.0 Host Controller (rev 10)
Bus 005 Device 001 Port 5-0 ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002 Port 5-4 ID 1d5c:5011 Fresco Logic USB2.0 Hub
Bus 006 Device 001 Port 6-0 ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 006 Device 002 Port 6-2 ID 090c:1000 Silicon Motion, Inc. - Taiwan (formerly Feiya Technology Corp.) Flash Drive
Bus 006 Device 003 Port 6-4 ID 1d5c:5001 Fresco Logic USB3.0 Hub
IOMMU group 20: [1000:0072] 03:00.0 Serial Attached SCSI controller: Broadcom / LSI SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 03)
[1:0:0:0] disk ATA Samsung SSD 870 1B6Q /dev/sde 1.00TB
[1:0:1:0] disk ATA ST16000NM001G-2K SN02 /dev/sdf 16.0TB
[1:0:2:0] disk ATA ST16000NM001G-2K SN02 /dev/sdg 16.0TB
[1:0:3:0] disk ATA ST8000VN0022-2EL SC61 /dev/sdh 8.00TB
IOMMU group 21: [8086:15f3] 05:00.0 Ethernet controller: Intel Corporation Ethernet Controller I225-V (rev 03)
IOMMU group 22: [8086:15f3] 06:00.0 Ethernet controller: Intel Corporation Ethernet Controller I225-V (rev 03)
IOMMU group 23: [8086:2725] 07:00.0 Network controller: Intel Corporation Wi-Fi 6 AX210/AX211/AX411 160MHz (rev 1a)
IOMMU group 24: [144d:a808] 08:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983
This controller is bound to vfio, connected drives are not visible.
<?xml version='1.0' encoding='UTF-8'?>
<domain type='kvm' id='1'>
<name>Windows 10</name>
<uuid>30254974-facb-777e-7ee4-19438c9b00d4</uuid>
<metadata>
<vmtemplate xmlns="unraid" name="Windows 10" icon="windows.png" os="windows10"/>
</metadata>
<memory unit='KiB'>33554432</memory>
<currentMemory unit='KiB'>33554432</currentMemory>
<memoryBacking>
<hugepages/>
<nosharepages/>
</memoryBacking>
<vcpu placement='static'>14</vcpu>
<cputune>
<vcpupin vcpu='0' cpuset='1'/>
<vcpupin vcpu='1' cpuset='11'/>
<vcpupin vcpu='2' cpuset='2'/>
<vcpupin vcpu='3' cpuset='12'/>
<vcpupin vcpu='4' cpuset='3'/>
<vcpupin vcpu='5' cpuset='13'/>
<vcpupin vcpu='6' cpuset='4'/>
<vcpupin vcpu='7' cpuset='14'/>
<vcpupin vcpu='8' cpuset='5'/>
<vcpupin vcpu='9' cpuset='15'/>
<vcpupin vcpu='10' cpuset='6'/>
<vcpupin vcpu='11' cpuset='16'/>
<vcpupin vcpu='12' cpuset='7'/>
<vcpupin vcpu='13' cpuset='17'/>
<emulatorpin cpuset='9,19'/>
</cputune>
<resource>
<partition>/machine</partition>
</resource>
<os>
<type arch='x86_64' machine='pc-i440fx-6.1'>hvm</type>
<loader readonly='yes' type='pflash'>/usr/share/qemu/ovmf-x64/OVMF_CODE-pure-efi.fd</loader>
<nvram>/etc/libvirt/qemu/nvram/30254974-facb-777e-7ee4-19438c9b00d4_VARS-pure-efi.fd</nvram>
</os>
<features>
<acpi/>
<apic/>
<hyperv>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
<vpindex state='on'/>
<synic state='on'/>
<stimer state='on'/>
<reset state='on'/>
<vendor_id state='on' value='1234567890ab'/>
<frequencies state='on'/>
</hyperv>
<kvm>
<hidden state='on'/>
</kvm>
<vmport state='off'/>
<ioapic driver='kvm'/>
</features>
<cpu mode='host-passthrough' check='none' migratable='on'>
<topology sockets='1' dies='1' cores='7' threads='2'/>
<cache mode='passthrough'/>
</cpu>
<clock offset='utc'>
<timer name='rtc' present='no' tickpolicy='catchup'/>
<timer name='pit' present='no' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
<timer name='hypervclock' present='yes'/>
<timer name='tsc' present='yes' mode='native'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/local/sbin/qemu</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='writeback'/>
<source file='/mnt/user/domains/Windows 10/vdisk1.img' index='2'/>
<backingStore/>
<target dev='hdc' bus='virtio'/>
<alias name='virtio-disk2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file='/mnt/user/isos/virtio-win-0.1.208-1.iso' index='1'/>
<backingStore/>
<target dev='hdb' bus='ide'/>
<readonly/>
<alias name='ide0-0-1'/>
<address type='drive' controller='0' bus='0' target='0' unit='1'/>
</disk>
<controller type='virtio-serial' index='0'>
<alias name='virtio-serial0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<alias name='pci.0'/>
</controller>
<controller type='usb' index='0' model='qemu-xhci' ports='15'>
<alias name='usb'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</controller>
<controller type='ide' index='0'>
<alias name='ide'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:db:92:c6'/>
<source bridge='br0'/>
<target dev='vnet0'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/1'/>
<target type='isa-serial' port='0'>
<model name='isa-serial'/>
</target>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/1'>
<source path='/dev/pts/1'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<channel type='unix'>
<source mode='bind' path='/var/lib/libvirt/qemu/channel/target/domain-1-Windows 10/org.qemu.guest_agent.0'/>
<target type='virtio' name='org.qemu.guest_agent.0' state='disconnected'/>
<alias name='channel0'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
<input type='tablet' bus='usb'>
<alias name='input0'/>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'>
<alias name='input1'/>
</input>
<input type='keyboard' bus='ps2'>
<alias name='input2'/>
</input>
<audio id='1' type='none'/>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</source>
<alias name='hostdev0'/>
<rom file='/mnt/user/isos/2080s_trimmed.rom'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0' multifunction='on'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x1'/>
</source>
<alias name='hostdev1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x1'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x00' slot='0x14' function='0x0'/>
</source>
<alias name='hostdev2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x2'/>
</source>
<alias name='hostdev3'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x2'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x01' slot='0x00' function='0x3'/>
</source>
<alias name='hostdev4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x3'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
</source>
<alias name='hostdev5'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x10' function='0x0'/>
</hostdev>
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x08' slot='0x00' function='0x0'/>
</source>
<boot order='1'/>
<alias name='hostdev6'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x0c' function='0x0'/>
</hostdev>
<memballoon model='none'/>
</devices>
<seclabel type='dynamic' model='dac' relabel='yes'>
<label>+0:+100</label>
<imagelabel>+0:+100</imagelabel>
</seclabel>
</domain>