Bug 499352 - Re-enable CONFIG_DMAR_DEFAULT_ON
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
high Severity medium
: ---
: ---
Assigned To: Kyle McMartin
Fedora Extras Quality Assurance
Depends On: 490477
Blocks: 513462 F12VirtTarget
  Show dependency treegraph
Reported: 2009-05-06 06:26 EDT by Mark McLoughlin
Modified: 2015-08-31 23:53 EDT (History)
5 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2009-08-21 07:45:46 EDT
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

  None (edit)
Description Mark McLoughlin 2009-05-06 06:26:20 EDT
I've just noticed this:

* Tue Mar 24 2009 Kyle McMartin <kyle@redhat.com>
- Disable DMAR by default until suspend & resume is fixed.

Later, we had this:

* Fri Apr 10 2009 David Woodhouse <David.Woodhouse@intel.com>
- Fix suspend/resume with Intel IOMMU, handle devices behind PCI-PCI
  bridges, cope with BIOS claiming IOMMU is at address zero.

Should we re-enable it be default again?

For reference, this is needed for https://fedoraproject.org/wiki/Features/KVM_PCI_Device_Assignment - without CONFIG_DMAR_DEFAULT_ON people need to boot with "intel_iommu=on" in order to use device assignment
Comment 1 Chuck Ebbert 2009-05-07 00:48:58 EDT
I don't think we have nearly all the DMAR fixes that have gone into 2.6.30. (A few just got merged in the last few days.)
Comment 2 Mark McLoughlin 2009-05-07 05:34:40 EDT
Adding a known intel_iommu lockup as a dependency
Comment 3 David Woodhouse 2009-05-07 07:10:06 EDT
(In reply to comment #1)
> I don't think we have nearly all the DMAR fixes that have gone into 2.6.30. (A
> few just got merged in the last few days.)  

We should have everything that's needed. What do you think is missing?
Comment 4 Bug Zapper 2009-06-09 11:14:38 EDT
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.

More information and reason for this action is here:
Comment 5 Mark McLoughlin 2009-08-10 09:38:04 EDT
How are we looking for enabling this in F-12?
Comment 6 David Woodhouse 2009-08-10 10:06:48 EDT
Good, I think. I have some more BIOS workarounds which I can drop in now and re-enable it...
Comment 7 David Woodhouse 2009-08-10 10:28:18 EDT
OK, it's enabled. I'd quite like to drop the BROKEN_GFX_WA option too, but let's take things one step at a time...
Comment 8 Mark McLoughlin 2009-08-21 07:45:46 EDT
* Mon Aug 10 2009 David Woodhouse <David.Woodhouse@intel.com> 2.6.31-0.145.rc5.git3
- Merge latest Intel IOMMU fixes and BIOS workarounds, re-enable by default.

Note You need to log in before you can comment on or make changes to this bug.