linux-kernel - [PATCH v2 0/2] xen/grant-table: Avoid m2p

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Message-ID: <1389640119-7936-1-git-send-email-zoltan.kiss@citrix.com>
Date:	Mon, 13 Jan 2014 19:08:37 +0000
From:	Zoltan Kiss <zoltan.kiss@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	<xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
	Roger Pau Monné <roger.pau@...rix.com>,
	Jan Beulich <jbeulich@...e.com>,
	Ian Campbell <Ian.Campbell@...rix.com>
CC:	Zoltan Kiss <zoltan.kiss@...rix.com>
Subject: [PATCH v2 0/2] xen/grant-table: Avoid m2p_override during mapping

The grant mapping API does m2p_override unnecessarily: only gntdev needs it,
for blkback and future netback patches it just cause a lock contention, as
those pages never go to userspace. Therefore this series does the following:
- move the m2p_override part from grant_[un]map_refs to gntdev, where it is
  needed after mapping operations
- but move set_phys_to_machine from m2p_override to gnttab_[un]map_refs,
  because it is needed always
- update the function prototypes as kmap_ops are no longer needed

v2:
- move the storing of the old mfn in page->index to gnttab_map_refs
- move the function header update to a separate patch

Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
Suggested-by: David Vrabel <david.vrabel@...rix.com>

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