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
> -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
>>> 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 Structure
> -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 [mailto:konrad.w..
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
>>> 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 that
> -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
> >
> -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
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 buffer
>>> 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
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