6:43 p.m.
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(a)oracle.com>
---
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;
+ }
+ 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;
+ }
+
+ 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;
--
2.1.4