Bug 1306196

Summary: VFIO: device passthrough is not enabled by default on PPC platforms.
Product: [oVirt] vdsm Reporter: Nisim Simsolo <nsimsolo>
Component: GeneralAssignee: Martin Polednik <mpoledni>
Status: CLOSED CURRENTRELEASE QA Contact: Nisim Simsolo <nsimsolo>
Severity: urgent Docs Contact:
Priority: high    
Version: 4.17.9CC: bugs, gklein, hannsj_uhl, mavital, mgoldboi, michal.skrivanek, mpoledni, nsimsolo
Target Milestone: ovirt-3.6.3Flags: rule-engine: ovirt-3.6.z+
mgoldboi: exception+
mgoldboi: planning_ack+
michal.skrivanek: devel_ack+
mavital: testing_ack+
Target Release: 4.17.21   
Hardware: ppc64le   
OS: Unspecified   
Whiteboard: virt
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Previously, the check for availability of the direct device assignment feature (hostdev passthrough) would always end up negative. Patches in this bug improve the check to account for ppc64le kernel iommu reporting, causing the check to evaluate as expected (positive for known ppc64le machines).
 Story Points: ---
Clone Of: Environment:
Last Closed: 2016-03-11 07:22:52 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: Virt RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1201513    
Attachments:
Description Flags
engine log
none
vdsm log
none
screenshot none

Description Nisim Simsolo 2016-02-10 09:55:19 UTC 
Description of problem:
PPC platforms should support PCI-passthrough by default. 
Browsing webadmin ==> hosts tab ==> general, shows that "device passthrough" is disabled.

Version-Release number of selected component (if applicable):
rhevm-3.6.3-0.1.el6
qemu-kvm-rhev-2.3.0-31.el7_2.4.ppc64le
libvirt-client-1.2.17-13.el7.ppc64le
vdsm-4.17.19-0.el7ev.noarch

How reproducible:
100%

Steps to Reproduce:
1. Add PPC host to engine environment.
2. Try to attach PCI device to VM.
3. Observe webadmin hosts tab ==> general.

Actual results:
- Device failed to be attached.
- in webadmin: "device passthrough" value is disabled.

Expected results:
device passthrough should be enabled by default.

Additional info:
screenshot and logs attached.
Comment 1 Nisim Simsolo 2016-02-10 10:04:37 UTC 
Created attachment 1122725 [details]
engine log
Comment 2 Nisim Simsolo 2016-02-10 10:05:06 UTC 
Created attachment 1122726 [details]
vdsm log
Comment 3 Nisim Simsolo 2016-02-10 10:05:41 UTC 
Created attachment 1122727 [details]
screenshot
Comment 4 Nisim Simsolo 2016-02-22 13:41:04 UTC 
Verified:
rhevm-3.6.3.2-0.1.el6
libvirt-client-1.2.17-13.el7_2.2.ppc64le
qemu-kvm-rhev-2.3.0-31.el7_2.4.ppc64le
vdsm-4.17.21-0.el7ev.noarch
sanlock-3.2.4-1.el7.ppc64le

Verification scenarion:
1. Attach host PCI device to VM and run VM.
2. Verify device attached and appears in webadmin --> virtual machines tab --> VM --> host devices tab.
3. Open VM console and verify PCI device is attached (using lspci command).
4. Power off VM abd Verify powering off VM does not affect host functionality.
5. Run steps 1-4 again.