netdev - Re: [PATCH 0/8] Use correctly the Xen memory terminologies in Linux

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Date:	Tue, 28 Jul 2015 14:06:21 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Julien Grall <julien.grall@...rix.com>,
	xen-devel@...ts.xenproject.org
CC:	ian.campbell@...rix.com, stefano.stabellini@...citrix.com,
	linux-kernel@...r.kernel.org,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Jiri Slaby <jslaby@...e.com>, Juergen Gross <jgross@...e.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-api@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-fbdev@...r.kernel.org, linux-input@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-scsi@...r.kernel.org,
	netdev@...r.kernel.org,
	Roger Pau Monné <roger.pau@...rix.com>,
	Russell King <linux@....linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Wei Liu <wei.liu2@...rix.com>, x86@...nel.org
Subject: Re: [PATCH 0/8] Use correctly the Xen memory terminologies in Linux

On 07/28/2015 08:02 AM, Julien Grall wrote:
> Hi all,
> 
> This patch series aims to use the memory terminologies described in
> include/linux/mm.h [1] for Linux xen code.
> 
> Linux is using mistakenly MFN when GFN is meant, I suspect this is because the
> first support of Xen was for PV. This has brought some misimplementation
> of memory helpers on ARM and make the developper confused about the expected
> behavior.
> 
> For instance, with pfn_to_mfn, we expect to get a MFN based on the name.
> Although, if we look at the implementation on x86, it's returning a GFN.
> Most of the callers are also using it this way.
> 
> The first 2 patches of this series is ARM related in order to remove
> PV specific helpers which should not be used and fixing the implementation of
> pfn_to_mfn.
> 
> The rest of the series is here rename most of the usage in the common code
> of MFN to GFN. I also took the opportunity to replace most of the call to
> pfn_to_gfn in the common code by page_to_gfn avoid construction such
> as pfn_to_gfn(page_to_pfn(...).
> 
> Note the one xen-blkfront will be dropped by 64K series [2], I can include it
> if necessary.
> 

Can we actually get some documentation for Xen before starting to change
names around?

	-hpa


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