lkml.org 
[lkml]   [2011]   [Nov]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] iommu: Include MSI susceptibility to DMA in creating iommu groups
On Thu, Nov 17, 2011 at 10:09:26AM -0700, Alex Williamson wrote:
> IOMMU drivers should account for the platform's susceptibility to
> DMA triggered MSI interrupts in creating IOMMU groups. Skip
> devices when the IOMMU can't isolate MSI from DMA, but allow
> an iommu=group_unsafe_msi option for opt-in. This removes the
> leap in logic for users that IOMMU_CAP_INTR_REMAP is required for
> interrupt security when they may be running on a non-x86 platform
> that does not have this dependency.

I actually don't see the point in this. The iommu-group thing is to tell
user-space what devices the IOMMU can safely distinguish between. The
absence of interrupt-remapping changes nothing to that grouping. So why
remove it when interrupt remapping is not enabled?

Joerg

--
AMD Operating System Research Center

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632



\
 
 \ /
  Last update: 2011-11-18 11:49    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site