Error MAR: [DMA Read NO_PASID] PTE Read access is not set (Again!)

[reetp]

Have read several threads here but don't understand this error. eg

N

[SOLVED] Thread 'Enabling IOMMU on PVE6 (zfs) compared to PVE5.4 (ext4)?'

Jul 19, 2019

Hi All,

I did a clean install from Proxmox 5.4 (using single disk ext4) to Proxmox 6 (using single disk zfs) and notice that I don’t seem to be able to get IOMMU enabled under PVE6?

I followed the following instructions (as I had with PVE5.4) but suspect that because I’m not booting zfs, it’s using systemd-boot to boot rather than grub on PVE5.4 - https://pve.proxmox.com/wiki/Pci_passthrough

Following the above guide I did:

a) nano /etc/default/grub
b) Add “intel_iommu=on” to the following line. I notice that there is a second line here that mentions the ZFS rpool so...

• n1nj4888
• iommu pve6 systemd-boot
• Replies: 16
• Forum: Proxmox VE: Installation and configuration

• 

I have an old HP DL380 G7 with Proxmox 8 and no ZFS.

HP RAID Controller Smart Array P410i
1:03.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] ES1000 [1002:515e] (rev 02) (prog-if 00 [VGA controller])

Most of my VMs are servers - I don't really use them as desktops so I have no reason to use passthrough.

I have a couple in CPU 'Host' mode'.

I have always left Display as 'Default' and Machine as 'Default i440fx'

I had previous had this set in /etc/defaulty/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet nomodest"

I can see recommendations to add "intel_iommu=on" but seems I would need something in the BIOS and I don't understand why I would need this if I don't need passthrough!

Yes, I can add another video card with a bit more RAM and disable the internal one, but again, I don't really use the desktop facilities.

Any assistance appreciated.

-----------------

  *-display                 
       description: VGA compatible controller
       product: ES1000
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 3
       bus info: pci@0000:01:03.0
       logical name: /dev/fb0
       version: 02
       width: 32 bits
       clock: 33MHz
       capabilities: pm vga_controller bus_master cap_list rom fb
       configuration: depth=32 driver=radeon latency=64 mingnt=8 resolution=1024,768
       resources: irq:23 memory:e8000000-efffffff ioport:2000(size=256) memory:f1cf0000-f1cfffff memory:c0000-dffff

32 or 64MB Ram - but not sure which.