Re: Serious AMD-Vi(?) issue

[Elliott Mitchell <ehem+xen@xxxxxxx>]

On Fri, Mar 22, 2024 at 04:41:45PM +0000, Kelly Choi wrote:
> 
> I can see you've recently engaged with our community with some issues you'd
> like help with.
> We love the fact you are participating in our project, however, our
> developers aren't able to help if you do not provide the specific details.

Please point to specific details which have been omitted.  Fairly little
data has been provided as fairly little data is available.  The primary
observation is large numbers of:

(XEN) AMD-Vi: IO_PAGE_FAULT: DDDD:bb:dd.f d0 addr ffffff???????000 flags 0x8 I

Lines in Xen's ring buffer.  I recall spotting 3 messages from Linux's
SATA driver (which weren't saved due to other causes being suspected),
which would likely be associated with hundreds or thousands of the above
log messages.  I never observed any messages from the NVMe subsystem
during that phase.

The most overt sign was telling the Linux kernel to scan for
inconsistencies and the kernel finding some.  The domain didn't otherwise
appear to notice trouble.

This is from memory, it would take some time to discover whether any
messages were missed.  Present mitigation action is inhibiting the
messages, but the trouble is certainly still lurking.


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