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From: Andreas Hartmann <andihartmann@freenet.de>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	linux-pci <linux-pci@vger.kernel.org>
Subject: Re: Hard and silent lock up since linux 3.14 with PCIe pass through (vfio)
Date: Fri, 17 Oct 2014 03:04:52 +0200
Message-ID: <54406B34.1050808@maya.org> (raw)
In-Reply-To: <1413360267.4202.70.camel@ul30vt.home>

Hello Alex,

Alex Williamson wrote:
> Hi Andreas,
[...]
> Sorry for the breakage.  Is it possible to run lspci on the device in a
> loop from the host and capture whether we're failing to restore some of
> the VC bits to their previous state? 

> Does the problem also occur if you
> unbind from host driver,

The machine is booted w/ blacklisted ath9k. Then, the device is bound to
vfio:

echo "168c 0030" > /sys/bus/pci/drivers/vfio-pci/new_id
echo 0000:03:00.0 > /sys/bus/pci/devices/0000:03:00.0/driver/unbind
echo 0000:03:00.0 > /sys/bus/pci/drivers/vfio-pci/bind

afterwards the VM is started -> hang.

W/o starting th VM, I can bind it to vfio and unbind it from vfio w/o
any problem.

> echo 1 > reset in pci-sysfs,

echo 1 > /sys/bus/pci/devices/0000:03:00.0 works w/o any problem while
bound to vfio. Even after unbinding from vfio and rebinding to vfio
again ... .

> and re-bind to the

Do you mean loading ath9k in host system after unbinding from vfio? If
yes: Works w/o any problem. It's even possible to reset it or do a
ifconfig wlan0 up, ifconfig wlan0 down, rmmod ath9k, bind it to vfio
again and reset it, ....

Looks like the hang only is triggered by qemu-system_x86_64 on startup
the VM.

> host?  I'll also try to reproduce on my 990fx system, but I won't be
> able to do that until next week due to travel.  Thanks,


Regards,
Andreas

  reply index

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-23 19:03 Andreas Hartmann
2014-09-23 20:07 ` Alex Williamson
2014-09-24 14:54   ` Andreas Hartmann
2014-09-24 17:16     ` Andreas Hartmann
2014-10-10  9:39   ` Andreas Hartmann
2014-10-10 14:37     ` Bjorn Helgaas
2014-10-10 14:49       ` Andreas Hartmann
2014-10-10 15:55         ` Bjorn Helgaas
2014-10-10 16:09           ` Andreas Hartmann
2014-10-10 16:41             ` Bjorn Helgaas
2014-10-10 22:32               ` Andreas Hartmann
2014-10-10 22:54                 ` Bjorn Helgaas
2014-10-11  6:20                   ` Andreas Hartmann
2014-10-15  8:04                     ` Alex Williamson
2014-10-17  1:04                       ` Andreas Hartmann [this message]
2014-10-21 21:06                         ` Alex Williamson
2014-10-21 21:32                           ` Alex Williamson
2014-10-22 16:22                             ` Andreas Hartmann
2014-10-22 20:36                               ` Alex Williamson
2014-10-23 16:00                                 ` Andreas Hartmann
2014-10-23 16:33                                   ` Alex Williamson
2014-10-23 17:12                                     ` Andreas Hartmann
2014-10-23 17:33                                     ` Andreas Hartmann
2014-10-23 19:37                                       ` Alex Williamson
2014-10-24 14:21                                         ` Andreas Hartmann
2014-10-25  6:03                                         ` Andreas Hartmann
2014-10-28 21:51                                           ` Alex Williamson
2014-10-29 16:47                                             ` Andreas Hartmann
2014-10-29 17:44                                               ` Alex Williamson
2014-10-29 17:57                                                 ` Andreas Hartmann
2014-10-29 18:16                                                   ` Alex Williamson
2014-10-29 19:43                                                     ` Andreas Hartmann
2014-10-29 20:50                                                       ` Alex Williamson
2014-10-29 21:35                                                         ` Andreas Hartmann
2014-10-30 16:35                                                         ` Andreas Hartmann
2014-10-30 16:58                                                           ` Alex Williamson
2014-10-30 19:09                                                             ` Andreas Hartmann
2014-10-30 19:45                                                               ` Alex Williamson
2014-10-30 20:21                                                                 ` Andreas Hartmann
2014-10-22 15:34                           ` Andreas Hartmann
2014-10-22 16:02                             ` Alex Williamson
2014-10-22 16:20                               ` Andreas Hartmann

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