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

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Message-Id: <20190816104806.GC8784@in.ibm.com>
Date:   Fri, 16 Aug 2019 16:18:06 +0530
From:   Bharata B Rao <bharata@...ux.ibm.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.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.

Tested this series with my patches that add secure page management
for kvmppc guests. These patches along with migrate_vma-cleanup
series are good-to-have to support secure guests on ultravisor enabled
POWER platforms.

Regards,
Bharata.