t; > linux-kernel@vger.kernel.org
> > Subject: RE: [Xen-devel] [PATCH] xen/swiotlb: Exchange to contiguous memory
> > for map_sg hook
> >
> > >>> On 20.12.12 at 02:23, "Xu, Dongxiao" wrote:
> > > Sorry, maybe I am still not describing
>>> "Xu, Dongxiao" 01/07/13 8:17 AM >>>
> From: Jan Beulich [mailto:jbeul...@suse.com]
> >>> On 20.12.12 at 02:23, "Xu, Dongxiao" wrote:
>> > Take the libata case as an example, the static DMA buffer locates
>> > (dev->link->ap->sector_buf , here we use Data Structure B in the graph) in
>> > the
Xu, Dongxiao dongxiao...@intel.com 01/07/13 8:17 AM
From: Jan Beulich [mailto:jbeul...@suse.com]
On 20.12.12 at 02:23, Xu, Dongxiao dongxiao...@intel.com wrote:
Take the libata case as an example, the static DMA buffer locates
(dev-link-ap-sector_buf , here we use Data Structure B in the
: RE: [Xen-devel] [PATCH] xen/swiotlb: Exchange to contiguous memory
for map_sg hook
On 20.12.12 at 02:23, Xu, Dongxiao dongxiao...@intel.com wrote:
Sorry, maybe I am still not describing this issue clearly.
No, at least I understood you the way you re-describe below.
Take
> -Original Message-
> From: Jan Beulich [mailto:jbeul...@suse.com]
> Sent: Thursday, December 20, 2012 4:56 PM
> To: Xu, Dongxiao
> Cc: xen-de...@lists.xen.org; Konrad Rzeszutek Wilk;
> linux-kernel@vger.kernel.org
> Subject: RE: [Xen-devel] [PATCH] xen/swiotlb: E
-Original Message-
From: Jan Beulich [mailto:jbeul...@suse.com]
Sent: Thursday, December 20, 2012 4:56 PM
To: Xu, Dongxiao
Cc: xen-de...@lists.xen.org; Konrad Rzeszutek Wilk;
linux-kernel@vger.kernel.org
Subject: RE: [Xen-devel] [PATCH] xen/swiotlb: Exchange to contiguous memory
>>> On 20.12.12 at 02:23, "Xu, Dongxiao" wrote:
> Sorry, maybe I am still not describing this issue clearly.
No, at least I understood you the way you re-describe below.
> Take the libata case as an example, the static DMA buffer locates
> (dev->link->ap->sector_buf , here we use Data
On 20.12.12 at 02:23, Xu, Dongxiao dongxiao...@intel.com wrote:
Sorry, maybe I am still not describing this issue clearly.
No, at least I understood you the way you re-describe below.
Take the libata case as an example, the static DMA buffer locates
(dev-link-ap-sector_buf , here we use
> -Original Message-
> From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
> Sent: Thursday, December 20, 2012 4:09 AM
> To: Jan Beulich
> Cc: Xu, Dongxiao; xen-de...@lists.xen.org; linux-kernel@vger.kernel.org
> Subject: Re: [Xen-devel] [PATCH] xen/swiotlb: Exch
On Wed, Dec 12, 2012 at 09:38:23AM +, Jan Beulich wrote:
> >>> On 12.12.12 at 02:03, "Xu, Dongxiao" wrote:
> >> From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
> >> On Tue, Dec 11, 2012 at 06:39:35AM +, Xu, Dongxiao wrote:
> >> > > From: Konrad Rzeszutek Wilk
On Wed, Dec 12, 2012 at 09:38:23AM +, Jan Beulich wrote:
On 12.12.12 at 02:03, Xu, Dongxiao dongxiao...@intel.com wrote:
From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
On Tue, Dec 11, 2012 at 06:39:35AM +, Xu, Dongxiao wrote:
From: Konrad Rzeszutek Wilk
-Original Message-
From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
Sent: Thursday, December 20, 2012 4:09 AM
To: Jan Beulich
Cc: Xu, Dongxiao; xen-de...@lists.xen.org; linux-kernel@vger.kernel.org
Subject: Re: [Xen-devel] [PATCH] xen/swiotlb: Exchange to contiguous memory
el@vger.kernel.org
> > Subject: Re: [PATCH] xen/swiotlb: Exchange to contiguous memory for map_sg
> > hook
> >
> > On Tue, Dec 11, 2012 at 06:39:35AM +, Xu, Dongxiao wrote:
> > > > -Original Message-
> > > > From: Konrad Rzeszutek Wilk [m
: xen-de...@lists.xen.org; linux-kernel@vger.kernel.org
Subject: Re: [PATCH] xen/swiotlb: Exchange to contiguous memory for
map_sg hook
On Thu, Dec 06, 2012 at 09:08:42PM +0800, Dongxiao Xu wrote:
While mapping sg buffers, checking to cross page DMA buffer is
also needed
>>> On 12.12.12 at 02:03, "Xu, Dongxiao" wrote:
>> From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
>> On Tue, Dec 11, 2012 at 06:39:35AM +, Xu, Dongxiao wrote:
>> > > From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
>> > > What if this check was done in the routines
On 12.12.12 at 02:03, Xu, Dongxiao dongxiao...@intel.com wrote:
From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
On Tue, Dec 11, 2012 at 06:39:35AM +, Xu, Dongxiao wrote:
From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
What if this check was done in the routines
> -Original Message-
> From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
> Sent: Wednesday, December 12, 2012 1:07 AM
> To: Xu, Dongxiao
> Cc: xen-de...@lists.xen.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH] xen/swiotlb: Exchange to contiguous memory
el@vger.kernel.org
> > Subject: Re: [PATCH] xen/swiotlb: Exchange to contiguous memory for map_sg
> > hook
> >
> > On Thu, Dec 06, 2012 at 09:08:42PM +0800, Dongxiao Xu wrote:
> > > While mapping sg buffers, checking to cross page DMA buffer is also
> >
] xen/swiotlb: Exchange to contiguous memory for map_sg
hook
On Thu, Dec 06, 2012 at 09:08:42PM +0800, Dongxiao Xu wrote:
While mapping sg buffers, checking to cross page DMA buffer is also
needed. If the guest DMA buffer crosses page boundary, Xen should
exchange contiguous memory
-Original Message-
From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
Sent: Wednesday, December 12, 2012 1:07 AM
To: Xu, Dongxiao
Cc: xen-de...@lists.xen.org; linux-kernel@vger.kernel.org
Subject: Re: [PATCH] xen/swiotlb: Exchange to contiguous memory for map_sg
hook
> -Original Message-
> From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
> Sent: Friday, December 07, 2012 10:09 PM
> To: Xu, Dongxiao
> Cc: xen-de...@lists.xen.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH] xen/swiotlb: Exchange to contiguous memory
> -Original Message-
> From: Jan Beulich [mailto:jbeul...@suse.com]
> Sent: Thursday, December 06, 2012 9:38 PM
> To: Xu, Dongxiao
> Cc: xen-de...@lists.xen.org; konrad.w...@oracle.com;
> linux-kernel@vger.kernel.org
> Subject: Re: [Xen-devel] [PATCH] xen/swiotlb: E
-Original Message-
From: Jan Beulich [mailto:jbeul...@suse.com]
Sent: Thursday, December 06, 2012 9:38 PM
To: Xu, Dongxiao
Cc: xen-de...@lists.xen.org; konrad.w...@oracle.com;
linux-kernel@vger.kernel.org
Subject: Re: [Xen-devel] [PATCH] xen/swiotlb: Exchange to contiguous memory
-Original Message-
From: Konrad Rzeszutek Wilk [mailto:konrad.w...@oracle.com]
Sent: Friday, December 07, 2012 10:09 PM
To: Xu, Dongxiao
Cc: xen-de...@lists.xen.org; linux-kernel@vger.kernel.org
Subject: Re: [PATCH] xen/swiotlb: Exchange to contiguous memory for map_sg
hook
On Thu, Dec 06, 2012 at 01:37:41PM +, Jan Beulich wrote:
> >>> On 06.12.12 at 14:08, Dongxiao Xu wrote:
> > While mapping sg buffers, checking to cross page DMA buffer is
> > also needed. If the guest DMA buffer crosses page boundary, Xen
> > should exchange contiguous memory for it.
> >
> >
On Thu, Dec 06, 2012 at 09:08:42PM +0800, Dongxiao Xu wrote:
> While mapping sg buffers, checking to cross page DMA buffer is
> also needed. If the guest DMA buffer crosses page boundary, Xen
> should exchange contiguous memory for it.
So this is when we cross those 2MB contingous swatch of
On Thu, Dec 06, 2012 at 09:08:42PM +0800, Dongxiao Xu wrote:
While mapping sg buffers, checking to cross page DMA buffer is
also needed. If the guest DMA buffer crosses page boundary, Xen
should exchange contiguous memory for it.
So this is when we cross those 2MB contingous swatch of buffers.
On Thu, Dec 06, 2012 at 01:37:41PM +, Jan Beulich wrote:
On 06.12.12 at 14:08, Dongxiao Xu dongxiao...@intel.com wrote:
While mapping sg buffers, checking to cross page DMA buffer is
also needed. If the guest DMA buffer crosses page boundary, Xen
should exchange contiguous memory for
>>> On 06.12.12 at 14:08, Dongxiao Xu wrote:
> While mapping sg buffers, checking to cross page DMA buffer is
> also needed. If the guest DMA buffer crosses page boundary, Xen
> should exchange contiguous memory for it.
>
> Besides, it is needed to backup the original page contents
> and copy it
While mapping sg buffers, checking to cross page DMA buffer is
also needed. If the guest DMA buffer crosses page boundary, Xen
should exchange contiguous memory for it.
Besides, it is needed to backup the original page contents
and copy it back after memory exchange is done.
This fixes issues if
While mapping sg buffers, checking to cross page DMA buffer is
also needed. If the guest DMA buffer crosses page boundary, Xen
should exchange contiguous memory for it.
Besides, it is needed to backup the original page contents
and copy it back after memory exchange is done.
This fixes issues if
On 06.12.12 at 14:08, Dongxiao Xu dongxiao...@intel.com wrote:
While mapping sg buffers, checking to cross page DMA buffer is
also needed. If the guest DMA buffer crosses page boundary, Xen
should exchange contiguous memory for it.
Besides, it is needed to backup the original page contents
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