Re: [Xen-devel] [PATCH v3 00/31] libxl: Enable save/restore/migration of a restricted QEMU + libxl__ev_qmp_*

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

On Fri, Jun 01, 2018 at 03:36:49PM +0100, Anthony PERARD wrote:
> The real meat in this patch series start with patch
> "libxl_qmp_ev: Introduce libxl__ev_qmp_start() to connect to QMP"
> which implement libxl__ev_qmp_* functions to turn the QMP client into
> asynchronous mode.
> 
> This comes with two examples on how to use it:
> * "libxl_disk: Have libxl_cdrom_insert use libxl__ev_qmp"
>   with patches:
>   - "libxl_qmp: Implement libxl__qmp_insert_cdrom_ev"
>   - "libxl_disk: Cut libxl_cdrom_insert into step"
> * "libxl: QEMU startup sync based on QMP"
>   which can use QMP to find out when QEMU as started.
>   this requires: "libxl_dm: Pre-open QMP socket for QEMU"
>   But that only works with dm_restrict=1 as explain in the patch.
> 
> The first few patches do some cleanup and fixes of the current qmp client
> implementation, mostly because it bothered me as I think we should remove the
> current implementation. There is also two patches to allow to save a 
> restricted
> QEMU, but that would need to be converted over to libxl__ev_qmp_*.
> 
> There is still one bug that I haven't fix yet. When creating a guest with
> dm_restrict=1, the call to libxl__qmp_initializations() is going to fail
> because libxl is still connected to the QMP socket. But libxl doesn't care
> about failure, and that just mean that `xl console` will not work and vnc will
> not have any password. save/restore of the same guest will works fine because
> libxl__ev_qmp_* will have an oportunity to disconnect from the socket before
> libxl__qmp_initializations() is called.
> 
> Cheers,

Patches series available in a git tag:
https://xenbits.xen.org/git-http/people/aperard/xen-unstable.git 
libxl-migration-fdset-v3

-- 
Anthony PERARD

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