AMD iGPU passthrough won't work

jonsley said:
UPDATE I got it working on Windows and Ubuntu. Please check the end of this thread for how.

A

Thread 'Warning: UPDATING these packages broke my pci passthrough.'

I installed updates

libpve-common-perl/stable 8.2.6 all [upgradable from: 8.2.5]
pve-firmware/stable,stable 3.14-1 all [upgradable from: 3.13-3]
qemu-server/stable 8.2.5 amd64 [upgradable from: 8.2.4]

After doing this i was getting a task error saying cannot bind <pci-device> to vfio

Because my router is a vm with a pass through network card it screwed me. I had to bring out backup router and down grade all of these packages and then pass through was immediately restored.

I just wanted to post this to warn everyone and also let the devs know there is an issue with these packages.

I...

basically even new AMD CPUs still require setting up all the kernel parameters to split up each device into its own iommugroup! Yes!
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Now I am in need of advice :)

Can you please refresh my memory on what kernel params to use to break up IOMMU to it's maximum.

I am running into issues with AMD / Asrock rack at the moment. But before I start shaming asrock rack I first need to keep experimenting with kernel params and also update to the latest BIOS.
 
and then this is what I do not like.

People only faulting they got it to work but when asked just go radio silence.
Nah. no respect there.
 
diversity said:
and then this is what I do not like.

People only faulting they got it to work but when asked just go radio silence.
Nah. no respect there.
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Dude, its referenced in the post you quoted me on on a comment with my user name on it...




"@triarii Thank you for your post. The more complex parameters are REQUIRED for newer AMD CPUs as well. I followed so many guides that said if the GPU is in its own Iommugroup you don't need the params to split up the groups. But as soon as I added those kernel commands, each device on id that shared the same PCI lane with the GPU got its own iommugroup. Finally!

GRUB_CMDLINE_LINUX_DEFAULT="quiet amd_iommu iommu=pt initcall_blacklist=sysfb_init pci=assign-busses pcie_acs_override=downstream,multifunction"

everything worked.

AMD Ryzen 9950x"
 
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dude!!!!! how obscure can one make it?. I for one still feel that a simple reply to my question should have been the correct thing to do.

But to each their own.
 
diversity said:
dude!!!!! how obscure can one make it?. I for one still feel that a simple reply to my question should have been the correct thing to do.

But to each their own.
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each to there own, but take it somewhere else a proxmox forum is no place to kick off or argue
 
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dude. then why did you not lead by example. you started the argument now did you?

anyway. good look on your high horse.

i am signing out of this thread
 
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