lkml.org 
[lkml]   [2022]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RFC 10/11] iommu: Make IOPF handling framework generic
On Mon, Mar 21, 2022 at 11:42:16AM +0000, Jean-Philippe Brucker wrote:

> I tend to disagree with that last part. The fault is caused by a specific
> device accessing shared page tables. We should keep that device
> information throughout the fault handling, so that we can report it to the
> driver when things go wrong.

SVA faults should never be reported to drivers??

> A process can have multiple threads bound to different devices, they
> share the same mm so if the driver wanted to signal a misbehaving
> thread, similarly to a SEGV on the CPU side, it would need the
> device information to precisely report it to userspace.

I'm not sure I understand this - we can't match DMAs to executing
CPUs. On fault we fail the DMA and let the process keep running or
SIGSEGV the whole thread group.

Jason

\
 
 \ /
  Last update: 2022-03-21 13:44    [W:0.911 / U:0.036 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site