lkml.org 
[lkml]   [2020]   [Jul]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 4/4] PCI/ACS: Enable PCI_ACS_TB for untrusted/external-facing devices
On Sat, Jul 11, 2020 at 09:58:38PM -0500, Bjorn Helgaas wrote:
> If BIOS handed off with ATS enabled and we somehow relied on it being
> already enabled, something might break if we start disabling ATS.
> Just a theoretical possibility, doesn't seem likely to me.

I don't think this will be a problem. When the BIOS enables ATS for a
device it also needs to enable the IOMMU already, an we are not handling
an already enabled IOMMU (outside of kdump kernels) very well.


Regards,

Joerg

\
 
 \ /
  Last update: 2020-07-13 10:01    [W:0.046 / U:1.500 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site