nvme: IO_PAGE_FAULT logged with Intel SSDPEKKF512G8

[Keith Busch]

On Tue, Jan 18, 2022 at 03:32:45PM +0100, Paul Menzel wrote:
> On a Dell OptiPlex 5055 with an Intel SSDPEKKF512G8, Linux 5.10.82 reported
> an IO_PAGE_FAULT error. This is the first and only time this has happened.
> 
>     $ dmesg --level=err
>     [    4.194306] nvme 0000:01:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x000c address=0xffffc080 flags=0x0050]
>     [    4.206970] nvme 0000:01:00.0: AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x000c address=0xffffc000 flags=0x0050]
>     [    7.327820] kfd kfd: VERDE  not supported in kfd
>     $ lspci -nn -s 01:00.0
>     01:00.0 Non-Volatile memory controller [0108]: Intel Corporation SSD Pro 7600p/760p/E 6100p Series [8086:f1a6] (rev 03)

I think it's a bug with the iommu implementation. If it causes problems,
you can typically work around it with kernel parameter "iommu=soft".