[libvirt] [PATCH v3] qemu: call drive_unplug in DetachPciDiskDevice

[Eric Blake]

On 10/25/2010 09:28 AM, Daniel P. Berrange wrote:
> On Fri, Oct 22, 2010 at 09:14:22AM -0500, Ryan Harper wrote:
>> Currently libvirt doesn't confirm whether the guest has responded to the
>> disk removal request.  In some cases this can leave the guest with
>> continued access to the device while the mgmt layer believes that it has
>> been removed.  With a recent qemu monitor command[1] we can
>> deterministically revoke a guests access to the disk (on the QEMU side)
>> to ensure no futher access is permitted.
>>
>> This patch adds support for the drive_unplug() command and introduces it
>> in the disk removal paths.  There is some discussion to be had about how
>> to handle the case where the guest is running in a QEMU without this
>> command (and the fact that we currently don't have a way of detecting
>> what monitor commands are available).
>>
>> Changes since v2:
>>  - use VIR_ERROR to report when unplug command not found
>> Changes since v1:
>>  - return > 0 when command isn't present, < 0 on command failure
>>  - detect when drive_unplug command isn't present and log error
>>    instead of failing entire command
> 
> This looks good to me now, ACK, pending my testing with old QEMU
> versions under the TCK

Is there any further TCK testing needed for this before we push, or
should I go ahead and push it now?

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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