[Bug 219009] Random host reboots on Ryzen 7000/8000 using nested VMs (vls suspected)

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https://bugzilla.kernel.org/show_bug.cgi?id=219009

--- Comment #16 from blake (blake@xxxxxxxxxx) ---
At least for me, I haven't noticed any performance hit. These systems are all
headless though.

On Sat, Aug 31, 2024, at 6:51 AM, bugzilla-daemon@xxxxxxxxxx wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=219009
> 
> --- Comment #14 from h4ck3r (michal.litwinczuk@xxxxx) ---
> (In reply to blake from comment #13)
> > I recently experienced this. I built a proxmox cluster with 7950x. Every
> > node that I tested on would hard reset with no logs when a VM was doing
> > nested virtualization.
> > 
> > Our CI testing uses VMs, and putting the CI in a VM itself makes it pretty
> > easy to reproduce, just takes some time.
> > 
> > Setting kvm_amd.vls=0 seems to have resolved the issue, we had zero node
> > resets today and I was trying to force them.
> > 
> > Kernel is Proxmox's 6.8.12-1-pve.
> > 
> > Thanks,
> > Blake
> 
> Disabling vls does help with crashes, but has too much performance penalty.
> In my case it would lock gpu utilization at 40% max. (proxmox win10/11 hyperv
> enabled)
> 
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