Re: [PATCH for-next 2/2] IB/hfi1: Make Unsupported Request error non-fatal

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On Thu, Apr 11, 2019 at 08:37:53PM +0000, Arumugam, Kamenee wrote:

> On Thu, Apr 11, 2019 at 06:22:45PM +0000, Arumugam, Kamenee wrote:
> 
> > This is a device bug then. 
> 
> > A RDMA device must accept and respond to all TLPs that the CPU could create for the user accessible BAR pages.
> 
> > A user process must not be able to crash the CPU or make the device malfunction by accessing the exposed BAR page. This includes a broad range of topics, like mis-aligned acceses, SSE instructions, atomics, >etc.
> 
> > Is blocking AER even enough here? If the device isn't generating a reasonable reply I have a bad feeling worse will happen.
> 
> After blocking unsupported request error, we don't see any other issue including no system hang. 

Are you specifically testing all the special TLPs the CPU can produce?

Jason



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