linux-kernel - Re: [PATCH] xen/grant-table: Refactor gnttab_[un]map_refs to avoid m2p

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Date:	Mon, 10 Mar 2014 17:35:58 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Russell King <linux@....linux.org.uk>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Matt Wilson <msw@...ux.com>,
	Anthony Liguori <aliguori@...zon.com>,
	Roger Pau Monné <roger.pau@...rix.com>,
	<x86@...nel.org>, <xen-devel@...ts.xenproject.org>,
	<virtualization@...ts.linux-foundation.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xen/grant-table: Refactor gnttab_[un]map_refs to avoid
 m2p_override

On 27/02/14 15:55, Zoltan Kiss wrote:
> (This is a continuation of "[PATCH v9] 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:
> - the bulk of the original function (everything after the mapping hypercall)
>   is moved to arch-dependent set/clear_foreign_p2m_mapping
> - the "if (xen_feature(XENFEAT_auto_translated_physmap))" brach goes to ARM
> - therefore the ARM function could be much smaller, the m2p_override stubs
>   could be also removed
> - on x86 the set_phys_to_machine calls were moved up to this new funcion
>   from m2p_override functions
> - and m2p_override functions are only called when there is a kmap_ops param
> 
> It also removes a stray space from arch/x86/include/asm/xen/page.h.

Applied to devel/for-linus-3.15.

Thanks.

David
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