From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 47451] New: need to re-load driver in guest to make a hot-plug
VF work
Date: Thu, 13 Sep 2012 09:21:40 +0000 (UTC)
Message-ID:
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: QUOTED-PRINTABLE
To: kvm@vger.kernel.org
Return-path:
Received: from mail.kernel.org ([198.145.19.201]:60613 "EHLO mail.kernel.org"
rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
id S1752234Ab2IMJVs convert rfc822-to-8bit (ORCPT
); Thu, 13 Sep 2012 05:21:48 -0400
Received: from mail.kernel.org (localhost [127.0.0.1])
by mail.kernel.org (Postfix) with ESMTP id B8C85203B8
for ; Thu, 13 Sep 2012 09:21:46 +0000 (UTC)
Received: from bugzilla.kernel.org (unknown [198.145.19.217])
by mail.kernel.org (Postfix) with ESMTP id CA34C203B3
for ; Thu, 13 Sep 2012 09:21:45 +0000 (UTC)
Sender: kvm-owner@vger.kernel.org
List-ID:
https://bugzilla.kernel.org/show_bug.cgi?id=3D47451
Summary: need to re-load driver in guest to make a hot-plug =
VF
work
Product: Virtualization
Version: unspecified
Kernel Version: 3.5.0
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
AssignedTo: virtualization_kvm@kernel-bugs.osdl.org
ReportedBy: yongjie.ren@intel.com
Regression: Yes
Environment:
------------
Host OS (ia32/ia32e/IA64):ia32e
Guest OS (ia32/ia32e/IA64):ia32e
Guest OS Type (Linux/Windows):Linux (RHEL6u3)
kvm.git Commit:37e41afa97307a3e54b200a5c9179ada1632a844(master branch)
qemu-kvm Commit:28c3a9b197900c88f27b14f8862a7a15c00dc7f0(master branch)
Host Kernel Version:3.5.0-rc6 (Also exists in 3.6.0-rc3)
Hardware:Romley-EP (SandyBridge system)
Bug detailed description:
--------------------------
After hot plugging a VF to a Linux guest (e.g.RHEL6.3) in qemu monitor,=
the VF
cannot work in the guest by. I need to remove the VF driver (e.g. igbvf=
,
ixgbevf) and probe it again, then the VF can work in guest.
NIC: Intel 82599 NIC, Intel 82576 NIC
It needn't reload VF driver in hot-plug case when using an old kernel.
It's a regression in kernel. (commits are in kvm.git and qemu-kvm.git t=
ree)
kvm + qemu-kvm =3Dresult
37e41afa + 28c3a9b1 =3Dbad
322728e5 + 28c3a9b1 =3Dgood
Note:
1. When assigning a VF in qemu-kvm command line (not hot-plug), VF can =
work
fine after boot-up.
2. It's easier to reproduce this in guest with 512/1024MB memory and 1/=
2 vCPUs.
3. Can't always reproduce with 2048MB and 2vCPUs. (Not very stable.)
Reproduce steps:
----------------
1.start up a host with kvm
2.qemu-system-x86_64 -m 512 smp 2 =E2=80=93net none =E2=80=93hda /root/=
rhel6u3.img
3.switch to qemu monitor (ctrl+Alt+2)
4.device_add pci-assign,host=3D02:10.0,id=3Dmynic (02:10.0 is VF's BD=
=46 number.)
5.switch to guest (ctrl+Alt+1)
6.check network of the VF. (it can't work)
7. remove VF driver in guest ('rmmod igbvf')
8. re-probe VF driver in guest ('modprobe igbvf')
9. check network of the VF. (It should work this time.)
Current result:
----------------
The VF cannot work in the guest by default. Need to re-load VF driver i=
n guest.
Expected result:
----------------
VF works well in the guest by default after hot-plug.
--=20
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=3Demai=
l
------- You are receiving this mail because: -------
You are watching the assignee of the bug.