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From: Ian Munsie <imunsie@au1.ibm.com>
To: mpe <mpe@ellerman.id.au>
Subject: Re: [PATCH 7/7] CXL: Unmap MMIO regions when detaching a context
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Date: Mon, 15 Dec 2014 14:32:18 +1100
Message-Id: <1418613792-sup-5165@delenn.ozlabs.ibm.com>
Cc: cbe-oss-dev <cbe-oss-dev@lists.ozlabs.org>,
 Philippe Bergheaud <philippe.bergheaud@fr.ibm.com>, mikey <mikey@neuling.org>,
 "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
 linux-kernel <linux-kernel@vger.kernel.org>,
 linuxppc-dev <linuxppc-dev@ozlabs.org>, anton <anton@samba.org>,
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Excerpts from Ian Munsie's message of 2014-12-08 19:18:01 +1100:
> From: Ian Munsie <imunsie@au1.ibm.com>
> 
> If we need to force detach a context (e.g. due to EEH or simply force
> unbinding the driver) we should prevent the userspace contexts from
> being able to access the Problem State Area MMIO region further, which
> they may have mapped with mmap().
> 
> This patch unmaps any mapped MMIO regions when detaching a userspace
> context.

Might want to drop this one for now - Philippe found that it sometimes
causes an issue when multiple contexts are using the afu. Seems that
unmap_mapping_range() unmapped a bit more than I expected.

Cheers,
-Ian