[libvirt] [PATCH] qemu: Fix race between device rebind and kvm cleanup

Chris Lalancette clalance at redhat.com
Fri Jan 22 17:05:03 UTC 2010

On 01/22/2010 12:01 PM, Daniel Veillard wrote:
> On Fri, Jan 22, 2010 at 11:40:38AM -0500, Chris Lalancette wrote:
>> Certain hypervisors (like qemu/kvm) map the PCI bar(s) on
>> the host when doing device passthrough.  This can lead to a race
>> condition where the hypervisor is still cleaning up the device while
>> libvirt is trying to re-attach it to the host device driver.  To avoid
>> this situation, we look through /proc/iomem, and if the hypervisor is
>> still holding onto the bar (denoted by the string in the matcher variable),
>> then we can wait around a bit for that to clear up.
>> v2: Thanks to review by DV, make sure we wait the full timeout per-device


>   ACK,

Thanks, pushed.

Chris Lalancette

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