lkml.org 
[lkml]   [2008]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0/2] x86: per-device dma_mapping_ops
On Thu, May 15, 2008 at 11:03:40PM +0200, Andi Kleen wrote:
> On Thu, May 15, 2008 at 06:26:31PM +0300, Muli Ben-Yehuda wrote:
> > On Thu, May 15, 2008 at 06:41:26PM +0900, FUJITA Tomonori wrote:
> >
> > > I thought that KVM people want to do it per device (in the first
> > > case). So with my patchse, they can replace the dma_ops pointer
> > > in dev_archdata with what they want.
> >
> > That's my understanding too. We use stackable ops as a poor man's
> > replacement for per-device ops (depending on what kind of device
> > it is, call the original ops or our pvdma ops).
>
> But in the KVM case you still need to support the underlying ops
> too, e.g. in case of bouncing through swiotlb needed

Good point, although "secondary" DMA-ops should only be needed in rare
cases (the only one I can think of is bouncing through swiotlb for a
pass-through device which has a limited DMA mask), whereas per-device
ops are needed for every pass-through device.

Cheers,
Muli


\
 
 \ /
  Last update: 2008-05-15 23:37    [W:2.125 / U:0.720 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site