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

From: Michael Ellerman
Date: Sun Aug 30 2015 - 17:20:47 EST

On Thu, 2015-27-08 at 09:50:19 UTC, Ian Munsie wrote:
> From: Ian Munsie <imunsie@xxxxxxxxxxx>
> 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@xxxxxxxxxxx>

Applied to powerpc next, thanks.

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