linux-kernel - Re: [PATCH 0/4] xen: map foreign pages for shared rings by updating the PTEs directly

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Message-ID: <20111020234459.GF19558@phenom.dumpdata.com>
Date:	Thu, 20 Oct 2011 19:44:59 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>
Cc:	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/4] xen: map foreign pages for shared rings by updating
 the PTEs directly

On Thu, Oct 20, 2011 at 11:45:15AM +0100, David Vrabel wrote:
> This series of patches allows the vmalloc_sync_all() to be removed
> from alloc_vm_area() by getting the hypervisor to update the PTEs (in
> init_mm) directly rather than having the hypervisor look in the
> current page tables to find the PTEs.
> 
> Once the hypervisor has updated the PTEs, the normal mechanism of
> syncing the page tables after a fault works as expected.
> 
> This mechanism doesn't currently work on the ia64 port as that does
> not support the GNTMAP_contains_pte flag.
> 
> Andrew, patch 4 (xen: map foreign pages for shared rings by updating
> the PTEs directly) depends on patch 1 so it's probably best to go via
> Konrad's Xen tree with your acked-by.

Or I can Ack patch 1 and Andrew can pick both of them. Either way - but let
mention the Ack on patch #1

> 
> David
> 
> David Vrabel (4):
>   xen: use generic functions instead of xen_{alloc,free}_vm_area()
>   block: xen-blkback: use API provided by xenbus module to map rings
>   net: xen-netback: use API provided by xenbus module to map rings
>   xen: map foreign pages for shared rings by updating the PTEs directly
> 
>  arch/ia64/include/asm/xen/grant_table.h |   29 -----------
>  arch/ia64/xen/grant-table.c             |   62 ------------------------
>  arch/x86/include/asm/xen/grant_table.h  |    7 ---
>  arch/x86/xen/grant-table.c              |    2 +-
>  drivers/block/xen-blkback/common.h      |    5 +--
>  drivers/block/xen-blkback/xenbus.c      |   54 +++------------------
>  drivers/net/xen-netback/common.h        |   11 ++--
>  drivers/net/xen-netback/netback.c       |   80 +++++++------------------------
>  drivers/xen/xenbus/xenbus_client.c      |   15 ++++--
>  include/linux/vmalloc.h                 |    2 +-
>  include/xen/grant_table.h               |    1 -
>  mm/vmalloc.c                            |   27 +++++-----
>  12 files changed, 55 insertions(+), 240 deletions(-)
>  delete mode 100644 arch/ia64/include/asm/xen/grant_table.h
>  delete mode 100644 arch/x86/include/asm/xen/grant_table.h
> 
> -- 
> 1.7.2.5
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