Re: [PATCH v2 3/4] device: cleanup input device code

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On 12.01.2016 12:59, Pavel Hrdina wrote:
> The current code was a little bit odd.  At first we've removed all
> possible implicit input devices from domain definition to add them later
> back if there was any graphics device defined while parsing XML
> description.  That's not all, while formating domain definition to XML
> description we at first ignore any input devices with bus different to
> USB and VIRTIO and few lines later we add implicit input devices to XML.
> 
> This seems to me as a lot of code for nothing.  This patch may look
> to be more complicated than original approach, but this is a preferred
> way to modify/add driver specific stuff only in those drivers and not
> deal with them in common parsing/formating functions.
> 
> The update is to add those implicit input devices into config XML to
> follow the real HW configuration visible by guest OS.
> 
> There was also inconsistence between our behavior and QEMU's in the way,
> that in QEMU there is no way how to disable those implicit input devices
> for x86 architecture and they are available always, even without graphics
> device.  This applies also to XEN hypervisor.  VZ driver already does its
> part by putting correct implicit devices into live XML.
> 
> Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
> ---
>  src/Makefile.am            |  4 +--
>  src/conf/domain_conf.c     | 82 +++++-----------------------------------------
>  src/libxl/libxl_domain.c   |  5 +++
>  src/qemu/qemu_domain.c     | 23 +++++++++++++
>  src/xen/xen_driver.c       |  5 +++
>  src/xenapi/xenapi_driver.c |  5 +++
>  src/xenconfig/xen_common.c | 22 +++++++++++++
>  src/xenconfig/xen_common.h |  2 ++
>  8 files changed, 72 insertions(+), 76 deletions(-)
> 
> diff --git a/src/Makefile.am b/src/Makefile.am
> index aa5ab69..522c56d 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -1211,7 +1211,7 @@ libvirt_driver_xen_impl_la_CFLAGS =				\
>  		-I$(srcdir)/xenconfig				\
>  		$(AM_CFLAGS)
>  libvirt_driver_xen_impl_la_LDFLAGS = $(AM_LDFLAGS)
> -libvirt_driver_xen_impl_la_LIBADD = $(XEN_LIBS)
> +libvirt_driver_xen_impl_la_LIBADD = $(XEN_LIBS) libvirt_xenconfig.la
>  libvirt_driver_xen_impl_la_SOURCES = $(XEN_DRIVER_SOURCES)
>  endif WITH_XEN
>  
> @@ -1272,7 +1272,7 @@ if WITH_XENAPI
>  noinst_LTLIBRARIES += libvirt_driver_xenapi.la
>  libvirt_la_BUILT_LIBADD += libvirt_driver_xenapi.la
>  libvirt_driver_xenapi_la_CFLAGS = $(LIBXENSERVER_CFLAGS) $(CURL_CFLAGS) \
> -		-I$(srcdir)/conf $(AM_CFLAGS)
> +		-I$(srcdir)/conf -I$(srcdir)/xenconfig $(AM_CFLAGS)
>  libvirt_driver_xenapi_la_LDFLAGS = $(AM_LDFLAGS)
>  libvirt_driver_xenapi_la_LIBADD = $(LIBXENSERVER_LIBS) $(CURL_LIBS)
>  libvirt_driver_xenapi_la_SOURCES = $(XENAPI_DRIVER_SOURCES)


> diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
> index cf5c9f6..ee49ba7 100644
> --- a/src/libxl/libxl_domain.c
> +++ b/src/libxl/libxl_domain.c
> @@ -35,6 +35,7 @@
>  #include "virstring.h"
>  #include "virtime.h"
>  #include "locking/domain_lock.h"
> +#include "xenconfig/xen_common.h"

You don't need to do this crossdir include. -Ixenconfig is already on
the compiler's command line.

>  
>  #define VIR_FROM_THIS VIR_FROM_LIBXL
>  
> @@ -396,6 +397,10 @@ libxlDomainDefPostParse(virDomainDefPtr def,
>          def->consoles[0] = chrdef;
>      }
>  
> +    /* add implicit input devices */
> +    if (xenDomainDefAddImplicitInputDevice(def) < 0)
> +        return -1;
> +
>      /* memory hotplug tunables are not supported by this driver */
>      if (virDomainDefCheckUnsupportedMemoryHotplug(def) < 0)
>          return -1;

Michal

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