Help Error 43 Passthrough Nvdia GTX1070 After Update to 6.1-8


New Member
Mar 31, 2020
Please can anyone help me with this, after update from 6.0 to 6.1 my GPU passthrough suddenly not working, i have tried every combination in machine (q35/q35-3.1) and -cpu flags, event using patched rom file but its still error

here my grub:
GRUB_CMDLINE_LINUX_DEFAULT="quiet amd_iommu=on iommu=pt pcie_acs_override=downstream,multifunction pci=noaer nofb nomodeset video=efifb:off"

26:00.0 VGA compatible controller [0300]: NVIDIA Corporation GP104 [GeForce GTX 1070] [10de:1b81] (rev a1)
26:00.1 Audio device [0403]: NVIDIA Corporation GP104 High Definition Audio Controller [10de:10f0] (rev a1)

dmesg -wH when boot up VM:
[11282.342104] vfio-pci 0000:26:00.0: vfio_ecap_init: hiding ecap 0x19@0x900
[11282.344230] vfio-pci 0000:26:00.0: No more image in the PCI ROM

and .conf
bios: ovmf
boot: dcn
bootdisk: scsi0
cores: 8
cpu: host
efidisk0: lvm-thin:vm-114-disk-1,size=4M
hostpci0: 26:00,pcie=1,romfile=patched-gtx1070v2.rom
ide2: iso:iso/virtio-win.iso,media=cdrom,size=363104K
machine: q35
memory: 8192
name: win10
net0: virtio=7E:2F:4F:D6:B7:20,bridge=vmbr0,firewall=1
numa: 1
ostype: win10
scsi0: lvm-thin:vm-114-disk-0,cache=writeback,iothread=1,size=128G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=10e71cbe-fefe-4720-9158-14441caf24d5
sockets: 1
vga: none
vmgenid: 84fb2ab3-5c01-41bb-b7c4-864a703b0c66

and pveversion:
pve-manager/6.1-8/806edfe1 (running kernel: 5.3.18-3-pve)
cpu: host
hostpci0: 26:00,pcie=1,romfile=patched-gtx1070v2.rom

you have either put 'x-vga=1' to the hostpci0 setting, or set 'hv-vendor-id' on the cpu setting
otherwise the hv_vendor_id gets not set and nvidia detects kvm as a hypervisor


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