linux-kernel - Re: [2/2] cxl: Fix force unmapping mmaps of contexts allocated through the kernel api

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Date:	Mon, 31 Aug 2015 07:20:41 +1000 (AEST)
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Ian Munsie <imunsie@....ibm.com>
Cc:	Matt Ochs <mrochs@...ibm.com>,
	linuxppc-dev <linuxppc-dev@...abs.org>,
	mikey <mikey@...ling.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ian Munsie <imunsie@....ibm.com>
Subject: Re: [2/2] cxl: Fix force unmapping mmaps of contexts allocated through the kernel api

On Thu, 2015-27-08 at 09:50:19 UTC, Ian Munsie wrote:
> From: Ian Munsie <imunsie@....ibm.com>
> 
> The cxl user api uses the address_space associated with the file when we
> need to force unmap all cxl mmap regions (e.g. on eeh, driver detach,
> etc). Currently, contexts allocated through the kernel api do not do
> this and instead skip the mmap invalidation, potentially allowing them
> to poke at the hardware after such an event, which may cause all sorts
> of trouble.
> 
> This patch allocates an address_space for cxl contexts allocated through
> the kernel api so that the same invalidate path will for these contexts
> as well. We don't use the anonymous inode's address_space, as doing so
> could invalidate any mmaps of completely unrelated drivers using
> anonymous file descriptors.
> 
> This patch also introduces a kernelapi flag, so we know when freeing the
> context if the address_space was allocated by us and needs to be freed.
> 
> Signed-off-by: Ian Munsie <imunsie@....ibm.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/55e07668fbba9466e6a9ef76

cheers
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