11:23 a.m.
Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com>
---
docs/news.xml | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/docs/news.xml b/docs/news.xml
index 7ef18cf7b8..37b7fd9bba 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -114,6 +114,17 @@
malfunctioning VM could affect all those running on the same host.
</description>
</change>
+ <change>
+ <summary>
+ qemu: Support migration with SLIRP interface
+ </summary>
+ <description>
+ As <code>libslirp</code> evolves, so does QEMU. The recent change
is
+ that instead of peer-to-peer connection between QEMU and
+ <code>slirp-helper</code> process a separate D-BUS bus is created.
+ This enables QEMU to migrate with a SLIRP interface.
+ </description>
+ </change>
</section>
<section title="Bug fixes">
<change>
--
2.24.1
11:40 a.m.
On Wed, 2020-04-01 at 18:23 +0200, Michal Privoznik wrote:
+ <change>
+ <summary>
+ qemu: Support migration with SLIRP interface
+ </summary>
+ <description>
+ As <code>libslirp</code> evolves, so does QEMU. The recent change
is
+ that instead of peer-to-peer connection between QEMU and
+ <code>slirp-helper</code> process a separate D-BUS bus is
created.
+ This enables QEMU to migrate with a SLIRP interface.
+ </description>
+ </change>
This looks reasonable enough to me, so
Reviewed-by: Andrea Bolognani <abologna(a)redhat.com>
but let's maybe wait until tomorrow to push, in order to give
Marc-André a chance to speak his mind.
--
Andrea Bolognani / Red Hat / Virtualization
12:21 p.m.
Hi
On Wed, Apr 1, 2020 at 6:40 PM Andrea Bolognani <abologna(a)redhat.com> wrote:
On Wed, 2020-04-01 at 18:23 +0200, Michal Privoznik wrote:
> + <change>
> + <summary>
> + qemu: Support migration with SLIRP interface
> + </summary>
> + <description>
> + As <code>libslirp</code> evolves, so does QEMU. The recent
change is
> + that instead of peer-to-peer connection between QEMU and
> + <code>slirp-helper</code> process a separate D-BUS bus is
created.
> + This enables QEMU to migrate with a SLIRP interface.
> + </description>
> + </change>
This looks reasonable enough to me, so
Reviewed-by: Andrea Bolognani <abologna(a)redhat.com>
but let's maybe wait until tomorrow to push, in order to give
Marc-André a chance to speak his mind.
Thanks. That's quite accurate, but it may be misinterpreted:
Networking data is still going through a 1-1 dgram unix socket.
D-Bus bus is used to communicate with the helper for RPC/management,
including migration.
After discussions, we decided to switch to a bus, as it permits other
tools, such as libvirt or others, to interact with the helpers easily.
A bus topology reduces the overall complexity for implementation and
debugging. This should slowly become the RPC standard for
"multi-process qemu" in general. So libvirt will need a single
connection to the bus, and can then talk to the various helper
processes. Similarly for qemu or third-party (with security
restrictions).
Since the p2p dbus support was never actually used, I am not sure we
need to explain that there was a transition. Let me suggest:
qemu: Support migration with SLIRP helper interface
With QEMU 5.0, a new D-Bus backend allows migration of external
processes. When needed, libvirt will start a per-vm D-Bus bus, and
migrate the slirp-helper along with QEMU.
my 2c
1:56 p.m.
On Wed, 2020-04-01 at 19:21 +0200, Marc-André Lureau wrote:
Let me suggest:
qemu: Support migration with SLIRP helper interface
With QEMU 5.0, a new D-Bus backend allows migration of external
processes. When needed, libvirt will start a per-vm D-Bus bus, and
migrate the slirp-helper along with QEMU.
*per-VM
Aside from that nit, Marc-André's version looks good to me.
--
Andrea Bolognani / Red Hat / Virtualization
1726
days inactive
1726
days old
4 comments
4 participants
participants (4)
-
Andrea Bolognani -
Marc-André Lureau -
Michal Privoznik -
Michal Prívozník