Re: [PATCH] PCI: Avoid FLR for NVIDIA 5090 GPU

yuan.gao
2026-04-17T07:49:58Z

On Thu, Apr 16, 2026 at 07:37:54PM -0300, Jason Gunthorpe wrote:
> On Thu, Apr 16, 2026 at 12:31:00PM -0500, Bjorn Helgaas wrote:
> > On Thu, Apr 16, 2026 at 03:07:06PM +0800, yuan.gao wrote:
> > > When passing through the NVIDIA 5090 GPU to a vm, there is a certain
> > > probability of encountering an flr timeout during vm shutdown, which
> > > subsequently leads to a soft lock of the host cpu.
> >
> > If possible, would like confirmation of device erratum from Nvidia.
> > If there's no known erratum, there might be something wrong in the
> > Linux FLR and wait.
>
> I asked and was told there is a known device firmware defect that
> causes this.
>
> So blanket disabling FLR without detecting good and bad FW is not a
> good idea.
>
> I suggest Yuan try to use an NVIDIA support channel to try to resolve
> the issue with their card..
>
> Jason
Got it, thanks.

Cheers,
Yuan Gao