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Re: [libvirt] [PATCH 11/16] qemu: Implement the device parse callback and use it for interfaces



On 02/20/2013 12:06 PM, Peter Krempa wrote:
> This patch implements the callback that is used to fill the qemu default
> network card into the XML if none is provided in the definition.
> ---
>  src/qemu/qemu_conf.c   |  1 +
>  src/qemu/qemu_domain.c | 23 +++++++++++++++++++++++
>  src/qemu/qemu_domain.h |  1 +
>  3 files changed, 25 insertions(+)
>
> diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
> index a2a05d4..cc6a738 100644
> --- a/src/qemu/qemu_conf.c
> +++ b/src/qemu/qemu_conf.c
> @@ -556,6 +556,7 @@ virCapsPtr virQEMUDriverCreateCapabilities(virQEMUDriverPtr driver)
>
>      qemuDomainSetPrivateDataHooks(caps);
>      qemuDomainSetNamespaceHooks(caps);
> +    qemuDomainSetDefHooks(caps);
>
>      if (virGetHostUUID(caps->host.host_uuid)) {
>          virReportError(VIR_ERR_INTERNAL_ERROR,
> diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
> index 482f64a..7c8768b 100644
> --- a/src/qemu/qemu_domain.c
> +++ b/src/qemu/qemu_domain.c
> @@ -633,6 +633,24 @@ qemuDomainDefNamespaceFormatXML(virBufferPtr buf,
>      return 0;
>  }
>
> +
> +static int
> +qemuDomainDeviceDefCallback(void *device)
> +{
> +    virDomainDeviceDefPtr dev = device;
> +
> +    if (dev->type == VIR_DOMAIN_DEVICE_NET) {
> +        if (!dev->data.net->model) {
> +            if (!(dev->data.net->model = strdup("rtl8139"))) {
> +                virReportOOMError();
> +                return -1;
> +            }
> +        }
> +    }
> +    return 0;
> +}

This is a good example of why the domain pointer and caps pointer are
needed in the callback. The default netdev model cuold very well change
depending on which hypervisor is used, the version/capabilities of the
hypervisor, and the machinetype.

> +
> +
>  static const char *
>  qemuDomainDefNamespaceHref(void)
>  {
> @@ -659,6 +677,11 @@ void qemuDomainSetNamespaceHooks(virCapsPtr caps)
>      caps->ns.href = qemuDomainDefNamespaceHref;
>  }
>
> +void qemuDomainSetDefHooks(virCapsPtr caps)
> +{
> +    caps->virDriverDeviceDefCallback = qemuDomainDeviceDefCallback;
> +}
> +
>  static void
>  qemuDomainObjSaveJob(virQEMUDriverPtr driver, virDomainObjPtr obj)
>  {
> diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
> index 905b099..210cffd 100644
> --- a/src/qemu/qemu_domain.h
> +++ b/src/qemu/qemu_domain.h
> @@ -180,6 +180,7 @@ void qemuDomainEventQueue(virQEMUDriverPtr driver,
>
>  void qemuDomainSetPrivateDataHooks(virCapsPtr caps);
>  void qemuDomainSetNamespaceHooks(virCapsPtr caps);
> +void qemuDomainSetDefHooks(virCapsPtr caps);
>
>  int qemuDomainObjBeginJob(virQEMUDriverPtr driver,
>                            virDomainObjPtr obj,


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