[libvirt] [PATCH] On Xen, domains may be destroyed without libvirt being involved

[Peter Krempa]

On Sun, Dec 09, 2018 at 13:01:27 -0500, Demi M. Obenour wrote:
> This can happen via `xl destroy`, for example.  When this happens,
> libvirt is stuck in an inconsistent state: libvirt believes the domain
> is still running, but attempts to use libvirt’s APIs to shutdown the
> domain fail.  The only way out of this situation is to restart libvirt.
> 
> To prevent this from happening, process LIBXL_EVENT_TYPE_DOMAIN_DEATH as
> well as LIBXL_EVENT_TYPE_DOMAIN_SHUTDOWN, but only if libvirt has not
> already begun to destroy the domain.
> 
> Signed-off-by: Demi Obenour <demiobenour at gmail.com>
> ---
>  src/conf/domain_conf.h   |  4 ++++
>  src/libxl/libxl_domain.c | 24 +++++++++++++++++++-----
>  2 files changed, 23 insertions(+), 5 deletions(-)
> 
> diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
> index b24e6ec3de..d3520bde15 100644
> --- a/src/conf/domain_conf.h
> +++ b/src/conf/domain_conf.h
> @@ -2620,6 +2620,10 @@ struct _virDomainObj {
>      unsigned int updated : 1;
>      unsigned int removing : 1;
>  
> +    /* Only used by the Xen backend */
> +    unsigned int being_destroyed_by_libvirt : 1;
> +    unsigned int already_destroyed : 1;

Please put this into 'struct _libxlDomainObjPrivate' if it's going to be
only used by the libxl driver.

Also the 'bool' type should be used.

> +
>      virDomainDefPtr def; /* The current definition */
>      virDomainDefPtr newDef; /* New definition to activate at shutdown */
>  
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