On 09/16/2016 05:43 PM, Joao Martins wrote:
> And allow libxl to handle channel element which creates a Xen
> console visible to the guest as a low-bandwitdh communication
> channel. If type is PTY we also fetch the tty after boot using
> libxl_channel_getinfo to fetch the tty path. Since support for
> libxl channels only came on Xen >= 4.5 we therefore need to
> conditionally compile it with LIBXL_HAVE_DEVICE_CHANNEL.
>
> After this patch and having a qemu guest agent:
> $ cat domain.xml | grep -a1 channel | head -n 5 | tail -n 4
> <channel type='unix'>
> <source mode='bind' path='/tmp/channel'/>
> <target type='xen' name='org.qemu.guest_agent.0'/>
> </channel>
>
> $ virsh create domain.xml
> $ echo '{"execute":"guest-network-get-interfaces"}' | socat
> stdio,ignoreeof unix-connect:/tmp/channel
>
> {"execute":"guest-network-get-interfaces"}
> {"return": [{"name": "lo", "ip-addresses": [{"ip-address-type": "ipv4",
> "ip-address": "127.0.0.1", "prefix": 8}, {"ip-address-type": "ipv6",
> "ip-address": "::1", "prefix": 128}], "hardware-address":
> "00:00:00:00:00:00"}, {"name": "eth0", "ip-addresses":
> [{"ip-address-type": "ipv4", "ip-address": "10.100.0.6", "prefix": 24},
> {"ip-address-type": "ipv6", "ip-address": "fe80::216:3eff:fe40:88eb",
> "prefix": 64}], "hardware-address": "00:16:3e:40:88:eb"}, {"name":
> "sit0"}]}
>
> Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
> ---
>
> NB: Should path be autogenerated if not included?
> ---
> src/libxl/libxl_conf.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++
> src/libxl/libxl_domain.c | 41 ++++++++++++++++++++++
> 2 files changed, 131 insertions(+)
>
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index 306e441..6fe0fa0 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -1490,6 +1490,91 @@ int libxlDriverConfigLoadFile(libxlDriverConfigPtr cfg,
>
> }
>
> +#ifdef LIBXL_HAVE_DEVICE_CHANNEL
> +static int
> +libxlMakeChannel(virDomainChrDefPtr l_channel,
> + libxl_device_channel *x_channel)
> +{
> + int ret = -1;
> +
> + libxl_device_channel_init(x_channel);
> +
> + switch (l_channel->source.type) {
> + case VIR_DOMAIN_CHR_TYPE_PTY:
> + x_channel->connection = LIBXL_CHANNEL_CONNECTION_PTY;
> + break;
> + case VIR_DOMAIN_CHR_TYPE_UNIX:
> + x_channel->connection = LIBXL_CHANNEL_CONNECTION_SOCKET;
> + if (!l_channel->source.data.nix.path) {
> + virReportError(VIR_ERR_OPERATION_INVALID, "%s",
> + _("channel path missing for unix type"));
> + return ret;
> + }
Will need to change if, as we think, a missing source path should be auto generated.
> + if (VIR_STRDUP(x_channel->u.socket.path,
> + l_channel->source.data.nix.path) < 0)
> + return ret;
> + break;
> + default:
> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> + _("channel source type not supported"));
> + break;
> + }
> +
> + switch (l_channel->targetType) {
> + case VIR_DOMAIN_CHR_CHANNEL_TARGET_TYPE_XEN:
> + if (!l_channel->target.name) {
> + virReportError(VIR_ERR_OPERATION_INVALID, "%s",
> + _("channel target name missing"));
> + return ret;
> + }
> + if (VIR_STRDUP(x_channel->name, l_channel->target.name) < 0)
> + return ret;
> + ret = 0;
> + break;
> + default:
> + virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> + _("channel target type not supported"));
> + break;
> + }
IMO we can check for targetType == VIR_DOMAIN_CHR_CHANNEL_TARGET_TYPE_XEN on
entry to this function and do away with the switch statement.
> +
> + return ret;
> +}
> +
> +static int
> +libxlMakeChannelList(virDomainDefPtr def, libxl_domain_config *d_config)
> +{
> + virDomainChrDefPtr *l_channels = def->channels;
> + size_t nchannels = def->nchannels;
> + libxl_device_channel *x_channels;
> + size_t i, nvchannels = 0;
> +
> + if (VIR_ALLOC_N(x_channels, nchannels) < 0)
> + return -1;
> +
> + for (i = 0; i < nchannels; i++) {
> + if (l_channels[i]->deviceType != VIR_DOMAIN_CHR_DEVICE_TYPE_CHANNEL)
> + continue;
> +
> + if (libxlMakeChannel(l_channels[i], &x_channels[nvchannels]) < 0)
> + goto error;
> +
> + nvchannels++;
> + }
> +
> + VIR_SHRINK_N(x_channels, nchannels, nchannels - nvchannels);
> + d_config->channels = x_channels;
> + d_config->num_channels = nvchannels;
> +
> + return 0;
> +
> + error:
> + for (i = 0; i < nchannels; i++)
> + libxl_device_channel_dispose(&x_channels[i]);
> + VIR_FREE(x_channels);
> + return -1;
> +}
> +#endif
> +
> #ifdef LIBXL_HAVE_PVUSB
> int
> libxlMakeUSBController(virDomainControllerDefPtr controller,
> @@ -1864,6 +1949,11 @@ libxlBuildDomainConfig(virPortAllocatorPtr graphicsports,
> return -1;
> #endif
>
> +#ifdef LIBXL_HAVE_DEVICE_CHANNEL
> + if (libxlMakeChannelList(def, d_config) < 0)
> + return -1;
> +#endif
> +
> /*
> * Now that any potential VFBs are defined, update the build info with
> * the data of the primary display. Some day libxl might implicitely do
> diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
> index 43f4a7f..86c7d8e 100644
> --- a/src/libxl/libxl_domain.c
> +++ b/src/libxl/libxl_domain.c
> @@ -1059,6 +1059,42 @@ libxlDomainCreateIfaceNames(virDomainDefPtr def, libxl_domain_config *d_config)
> }
> }
>
> +#ifdef LIBXL_HAVE_DEVICE_CHANNEL
> +static void
> +libxlDomainCreateChannelPTY(virDomainDefPtr def, libxl_ctx *ctx)
> +{
> + libxl_device_channel *x_channels;
> + virDomainChrDefPtr chr;
> + size_t i;
> + int nchannels;
> +
> + x_channels = libxl_device_channel_list(ctx, def->id, &nchannels);
> + if (!x_channels)
> + return;
> +
> + for (i = 0; i < def->nchannels; i++) {
> + libxl_channelinfo channelinfo;
> + int ret;
> +
> + chr = def->channels[i];
> + if (chr->source.type != VIR_DOMAIN_CHR_TYPE_PTY)
> + continue;
> +
> + ret = libxl_device_channel_getinfo(ctx, def->id, &x_channels[i],
> + &channelinfo);
> +
> + if (!ret && channelinfo.u.pty.path &&
> + channelinfo.u.pty.path != '\0') {
> + VIR_FREE(chr->source.data.file.path);
> + ignore_value(VIR_STRDUP(chr->source.data.file.path,
> + channelinfo.u.pty.path));
> + }
> + }
> +
> + for (i = 0; i < nchannels; i++)
> + libxl_device_channel_dispose(&x_channels[i]);
> +}
> +#endif
>
> #ifdef LIBXL_HAVE_SRM_V2
> # define LIBXL_DOMSTART_RESTORE_VER_ATTR /* empty */
> @@ -1263,6 +1299,11 @@ libxlDomainStart(libxlDriverPrivatePtr driver,
>
> libxlDomainCreateIfaceNames(vm->def, &d_config);
>
> +#ifdef LIBXL_HAVE_DEVICE_CHANNEL
> + if (vm->def->nchannels > 0)
> + libxlDomainCreateChannelPTY(vm->def, cfg->ctx);
> +#endif
> +
> if ((dom_xml = virDomainDefFormat(vm->def, cfg->caps, 0)) == NULL)
> goto destroy_dom;
>
Otherwise, looks good.
Regards,
Jim
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