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Bug 1184340 - [Doc] Investigate removing 11.1. Using the QEMU guest virtual machine agent section
Summary: [Doc] Investigate removing 11.1. Using the QEMU guest virtual machine agent s...
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: doc-Virtualization_Deployment_and_Administration_Guide
Version: 7.1
Hardware: Unspecified
OS: Unspecified
medium
unspecified
Target Milestone: rc
: ---
Assignee: Platform Virt Docs
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1286552
TreeView+ depends on / blocked
 
Reported: 2015-01-21 06:45 UTC by Dayle Parker
Modified: 2019-03-06 00:59 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-12-20 08:39:33 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)

Comment 5 Eric Blake 2015-10-29 22:05:27 UTC
From 11.2:

> However, there are the following limitations with regards to isa-serial/virtio-serial transport:
> 
>     The qemu-guest-agent cannot detect whether or not a client has connected to the channel.

As far as I can tell, this sentence should remain - the guest does not know if someone in the host is listening to the channel.

>     There is no way for a client to detect whether or not qemu-guest-agent has disconnected or reconnected to the back-end.

This sentence can be dropped.  Libvirt can now tell if qemu-guest-agent has the channel opened, and recognizes when the guest drops and then reconnects over a qemu-guest-agent restart.  Libvirt is able to intelligently quit attempting guest agent commands if the guest agent is not connected.

>     If the virtio-serial device resets and qemu-guest-agent has not connected to the channel (generally caused by a reboot or hotplug), data from the client will be dropped.

This is still true.  But not very consequential - since libvirt knows when the agent is connected, it is not going to send data before that point. So you can drop the sentence.

>     If qemu-guest-agent has connected to the channel following a virtio-serial device reset, data from the client will be queued (and eventually throttled if available buffers are exhausted), regardless of whether or not qemu-guest-agent is still running or connected.

Again, still true but not very consequential, so you can drop the sentence.

Comment 15 Laura Novich 2015-12-14 20:17:09 UTC
Thanks Eric for your input
Moving to Verified
Laura

Comment 16 Laura Novich 2015-12-20 08:39:33 UTC
Published on December 17 version 2-24

Comment 17 Laura Novich 2015-12-20 08:42:43 UTC
Published on December 17 version 2-24


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