DMA read errors with passing through a wifi adapter


New Member
Jul 31, 2023
I am trying to pass through intel wireless adapter 8

This works, but I am getting tons of error messages from DMAR
[ 3802.658168] dmar_fault: 476 callbacks suppressed
[ 3802.658171] DMAR: DRHD: handling fault status reg 3
[ 3802.659753] DMAR: [DMA Read NO_PASID] Request device [00:16.7] fault addr 0x7d9cf000 [fault reason 0x02] Present bit in context entry is clear
[ 3802.766509] DMAR: DRHD: handling fault status reg 3
Pretty much any access to the device results in another fault.
The hos is HP laptop Elitebook 840 G4.
I am running the latest Proxmox 8 with all updates (including debian updates).
It also seems, the device is not working 100% in the VM, the access seems to be pretty slow, there are frequent timeouts and once in a while the list if wifi network can't be displayed.
The guest OS, is Windows 10 PE environment (Strelec latest bootable image.


The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!