On 28/07/15 22:06, H. Peter Anvin wrote:

On 07/28/2015 08:02 AM, Julien Grall wrote:

quoted

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?

http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=e758ed14f390342513405dd766e874934573e6cb

~Andrew