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Thank you. Did you create this yourself? Or is there an overview with code examples somewhere, and how I can ultimately integrate it in the proxmox host?

Since I can't easily pass through two GPUs with my B550 motherboard, I'm looking for an alternative. I'd like to create a hookscript that can do the following: If VM1 is shut down, then start VM2. AND If VM2 is shut down, then start VM1. This way, both VMs could share the single...

Sure, every system could have security issues. But thanks to you, I now understand where the danger lies with ACS Override and when it might be acceptable. Of course, only the user can make the final decision.

One last question. This only applies if the ACS patch is active, right? If you passthrough a GPU to a VM using the standard IOMMU groups (without patching), then there's no risk. Right?

Thank you, that I don't know. Thank you, that is clear to me. Even though I find it very difficult to accurately assess the risk for my specific use case. In my opinion it is very good, that in this forum the mebers tell us, that it is risky. In other forums the ACS patch is used lik a tutorial :(

This is to do to get IOMMU groups. And in most cases you get a big IOMMU-chipset group with B550 boards. Then you can brake this isolation an become virualized seperate IOMMU groups for the chipset group by patching the kernel with: "quiet iommu=pt pcie_acs_override=downstream,multifunction"...

Are other chips better than ASM1166? In other forums I see, that on newer motherboards there is an option "ACS enable" in BIOS. Is enabling ACS in BIOS as unsecure as patching the kernel with the acs patch?

Can I use every adapter with ASM1166 chip? I read, that using cards with muliplicator are not good .....

Thank you, then I will do it so. The ACS patch is for me too much risk, because the ethernet adapter is also in the big chipset group on B550. I'm simply not experienced enough to reliably assess the risk of the ACS patch for myself. Therefore, I'll leave it alone.

Thank you. Or I only use one GPU for passthrough. And use a M.2 to SATA adapter in an M.2 slot connected to the CPU for passthrough this to an TrueNAS VM. This passthough should even work on B550 withouth ACS-patch, because it is connected to the CPU. Is this right?

Thank you so much. It was my mistake to buy it. Now I don't want to buy used anymore and will buy a B550 and patch it with ACS. Are all B550s equally compatible with the ACS patch, or are there differences in how well the patch works?

Ohh, I think this is not so ... :( The second PCIe x16 is only an x4 from X570 chipset. And in the manual I don't find, that I can split the 16 lines to 8/8. So I guess I now have one of the few X570 boards where it won't work. I just have no luck buying used. :(

I had the change to get a cheap x570 over a forum. So i bought a ASUS X570 TUF gaming plus Wifi. I hope, that with this board a dual GPU passthrough will work in combination with pasthrough of an PCIe HBA.

I've spent several hours now looking into the ACS patch. Initially, I had serious security concerns, but if I understand correctly, the risk depends on many factors. If I use the patch, than the memory management group is ignored and every PCI device is in its own group. If I now passthroug a...

Thank you, I will see if an import will be possible. Of course, but I've had bad experiences buying used items twice already!

In the manual: Cool, is it possible, that you send me an link of an X570 board offer. Maybe I can import it in my country. :)

In the manual of the ASRock B550 PG Riptide is written, that 3 PCIe are connected to the CPU. Is this electrical possible with B550? If yes, then I maybe give the board a try .....

It's really crazy. The MSI B550-A Pro seems to be the only board that has two PCIe slots connected to the CPU and not End Of Life. Unfortunately, for some reason, the MSI doesn't support ECC. :( I'd even be happy with a second PCIe slot, even just x4, but I can't find a B550 board with that. :(

Thank you, is B450 maybe an option or are the equal to B550?

Thank you, but MC12-LE0 seems also EOL. :( Best is x570, but the boards are also all EOL. :(