com, Haren
Myneni/Beaverton/IBM@IBMUS
Date: 07/09/2020 04:01 PM
Subject:Re: [EXTERNAL] Re: [PATCH 1/2] powerpc/vas: Report proper
error for address translation failure
"Linuxppc-dev"
wrote on 07/09/2020 04:22:10 AM:
> From: Michael Ellerman
> To: Haren Myneni
&g
"Linuxppc-dev"
wrote on 07/09/2020 04:22:10 AM:
> From: Michael Ellerman
> To: Haren Myneni
> Cc: tuli...@br.ibm.com, ab...@us.ibm.com, linuxppc-
> d...@lists.ozlabs.org, rzin...@linux.ibm.com
> Date: 07/09/2020 04:21 AM
> Subject: [EXTERNAL] Re: [PATCH 1/2] powe
Haren Myneni writes:
> DMA controller uses CC=5 internally for translation fault handling. So
> OS should be using CC=250 and should report this error to the user space
> when NX encounters address translation failure on the request buffer.
That doesn't really explain *why* the OS must use CC=250
