Recent content by brightrgb

I created a Windows 11 and a Linux Mint VM on the same system. The GPU is passed through to both VMs via passthrough, and the USB ports for the mouse and keyboard are routed from the host to the VM. The GPU is an RX 6600XT installed on an Asus B550 motherboard. Everything works fine so far...

Thank you. Than I will stay with rombar=0 and try rombar=1 after the next big PVE update. Maybe it will work than. Otherwise I hope I never get an problem with rombar=0. And thanks again for your help with the other issue (other thread). I think it's great that I can passthrough two PCIe...

Thank you, now I understand what I do, when setting libata.force=nolpm. But I don't understand why deactivating the power management allows using rombar=1. Could it be possible, that in earlier proxmox kernels the default value was libata.force=nolpm?

You are right. I have the problem now. So I opened a new thread, because I am not sure what is the better workaround ..... ASM1166 - No passthrough with rombar=1 possible - PVE9 bug?

Hello, I want to passthrough an ASM1166 M.2.PCIe card to an VM. It only works, if I set rombar=0. Also it seems in PVE9 you don't have to blacklist the driver of the ASM1166, because PVE did this alone. Is it new, that blacklisting the driver is no longer needed? And is it a problem, if I set...

Hallo, I passthrough my GPU on an AMD B550 board to an Win11 guest with PVE9.1.1. Everything works, but in the manual is written, that i have to set "iommu=pt" to the kernel command line. I have a zfs system. So in my opinion I have to set "iommu=pt" to systemd-boot. Is this right? And what...

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.