linux-kernel - Re: add a not device managed memremap

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Message-ID: <20190816123356.GE5412@mellanox.com>
Date:   Fri, 16 Aug 2019 12:34:01 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Christoph Hellwig <hch@....de>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Bharata B Rao <bharata@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
Subject: Re: add a not device managed memremap_pages v2

On Fri, Aug 16, 2019 at 08:54:30AM +0200, Christoph Hellwig wrote:
> Hi Dan and Jason,
> 
> Bharata has been working on secure page management for kvmppc guests,
> and one I thing I noticed is that he had to fake up a struct device
> just so that it could be passed to the devm_memremap_pages
> instrastructure for device private memory.
> 
> This series adds non-device managed versions of the
> devm_request_free_mem_region and devm_memremap_pages functions for
> his use case.
> 
> Changes since v1:
>  - don't overload devm_request_free_mem_region
>  - export the memremap_pages and munmap_pages as kvmppc can be a module

What tree do we want this to go through? Dan are you running a pgmap
tree still? Do we know of any conflicts?

Thanks,
Jason