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Bug 1373184 - Use nec-xhci USB controller by default on ppc64
Summary: Use nec-xhci USB controller by default on ppc64
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.3
Hardware: ppc64le
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Pavel Hrdina
QA Contact: Dan Zheng
URL:
Whiteboard:
Depends On:
Blocks: 1401400
TreeView+ depends on / blocked
 
Reported: 2016-09-05 12:48 UTC by Andrea Bolognani
Modified: 2018-05-09 09:13 UTC (History)
7 users (show)

Fixed In Version: libvirt-3.2.0-4.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-08-01 17:14:13 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2017:1846 0 normal SHIPPED_LIVE libvirt bug fix and enhancement update 2017-08-01 18:02:50 UTC

Description Andrea Bolognani 2016-09-05 12:48:02 UTC 
libvirt currently defaults to pci-ohci on ppc64.

However, this USB controller has some issues (see Bug 1212275)
that are unlikely to ever be fixed; moreover nec-xhci is USB3
as opposed to USB2, which should give better performance anyway.

QEMU has already started using nec-xhci (see Bug 1284333)
because of these reasons.

libvirt, on the other hand, can't change its default due to
the fact that up until very recently the USB controller model
was not formatted in the guest configuration.

virt-install and related tools should use nec-xhci by default
for new ppc64 guests.

Note that a partially overlapping upstream RFE (Bug 1271410)
has already been filed a while ago; while implementing that
RFE would solve this bug as well, the scope for this bug is
much more narrow.
Comment 2 Pavel Hrdina 2017-03-02 08:52:16 UTC 
Moving this bug to Libvirt because Libvirt is the one who set's the default and in fact it can be fixed in Libvirt that only new domain will use nex-usb-xhci model.
Comment 3 Pavel Hrdina 2017-03-02 08:53:32 UTC 
Upstream patch posted:

https://www.redhat.com/archives/libvir-list/2017-March/msg00057.html
Comment 4 Pavel Hrdina 2017-04-20 07:15:49 UTC 
Upstream commit:

commit fe728cb4e8f13aec03dd263d9641dc0623f6a1c5
Author: Pavel Hrdina <phrdina>
Date:   Wed Mar 1 19:58:22 2017 +0100

    qemu_domain: use correct default USB controller on ppc64
Comment 7 Dan Zheng 2017-05-10 10:31:59 UTC 
Test package:
libvirt-3.2.0-4.el7.ppc64le
qemu-kvm-rhev-2.9.0-2.el7.ppc64le


Configure a guest XML with below usb controller setting without model specified.

<controller type='usb' index='0'/>

Save and re-check the XML, below model 'qemu-xhci' is created as default.

    <controller type='usb' index='0' model='qemu-xhci'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </controller>

Start the guest and check qemu command line.

qemu      33043      1 92 06:23 ?        00:00:13 /usr/libexec/qemu-kvm -name guest=vm1,debug-threads=on -S ... ***-device qemu-xhci,id=usb,bus=pci.0,addr=0x2 ***

[root@localhost ~]# lspci -vv
00:02.0 USB controller: Red Hat, Inc. Device 000d (rev 01) (prog-if 30 [XHCI])
	Subsystem: Red Hat, Inc Device 1100
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 17
	Region 0: Memory at 210000000000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: [90] MSI-X: Enable+ Count=16 Masked-
		Vector table: BAR=0 offset=00003000
		PBA: BAR=0 offset=00003800
	Kernel driver in use: xhci_hcd
Comment 8 Dan Zheng 2017-06-20 08:31:39 UTC 
Above test result is consistent to the expectation of BZ1438682 （comment 7） which is more preferable.
Comment 9 errata-xmlrpc 2017-08-01 17:14:13 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2017:1846
Comment 10 errata-xmlrpc 2017-08-01 23:55:08 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2017:1846
Comment 11 errata-xmlrpc 2017-08-02 01:27:35 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2017:1846
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