On 2/6/2017 at 4:57 AM, <address@hidden> wrote:
* Paolo Bonzini (address@hidden) wrote:
On 03/02/2017 07:00, Stefan Hajnoczi wrote:
On Thu, Feb 02, 2017 at 07:05:30AM ‑0800, Paolo Bonzini wrote:
The replication feature is a small amount of code, does not
require any external library and unless used does not add
anything to the guest's attack surface. Since any extra
configure option affects maintainability on the other hand
and is subject to bit rot, I think there is no need to
make it configurable.
I think the current state is good: replication is enabled by
default but
can be compiled out if desired.
Downstreams may not be comfortable supporting this feature yet since
it's incomplete. It's fair to offer an option to disable it,
otherwise
downstreams will have to patch this themselves.
I understand‑‑‑I just am not sure where to draw the line because
there's
plenty of other incomplete features, hence the RFC. For example,
record/replay cannot be enabled or disabled on the configure command
line. That was the case even in the beginning, where it didn't
support
either block or character device replay.
The line is certainly fuzzy, but I think it's worth making the
following
type of things configurable:
Features that have a large chunk of code
‑ dont lets try and configure tiny things on and off
That can be trivially configured
‑ lets not put big chunks of code around making them configurable
and that are incomplete
or are unused by large chunks of the users
Dave
‑‑enable‑coroutine‑pool is a relic of when Windows builds needed
it, but
all other ‑‑enable‑* options require an external library or at least a
specific operating system. See for example this patch:
commit 52b53c04faab9f7a9879c8dc014930649a3e698d
Author: Fam Zheng <address@hidden>
Date: Wed Sep 10 14:17:51 2014 +0800
block: Always compile virtio‑blk dataplane
Dataplane doesn't depend on linux‑aio any more, so we don't
need the
compiling condition now.
Configure options are kept but just print a message.
Signed‑off‑by: Fam Zheng <address@hidden>
Reviewed‑by: Paolo Bonzini <address@hidden>
Message‑id: address@hidden
Signed‑off‑by: Stefan Hajnoczi <address@hidden>
I would actually prefer to remove many of the latter
(‑‑enable‑vhost‑net, ‑‑enable‑vhost‑scsi, ‑‑enable‑vhost‑socket) and
just use default‑configs. We are already doing it for ivshmem for
example:
CONFIG_IVSHMEM=$(CONFIG_EVENTFD)
Paolo
‑‑
Dr. David Alan Gilbert / address@hidden / Manchester, UK