add console support in libxl

this patch introduce the console api in libxl driver for both pv and
hvm guest.  and import and update the libxlMakeChrdevStr function
which was deleted in commit dfa1e1dd.

Signed-off-by: Bamvor Jian Zhang <bjzhang@suse.com>

src/libxl/libxl_conf.c

@@ -330,6 +330,92 @@ error:
     return -1;
 }
 
+static int
+libxlMakeChrdevStr(virDomainChrDefPtr def, char **buf)
+{
+    virDomainChrSourceDef srcdef = def->source;
+    const char *type = virDomainChrTypeToString(srcdef.type);
+
+    if (!type) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       "%s", _("unknown chrdev type"));
+        return -1;
+    }
+
+    switch (srcdef.type) {
+    case VIR_DOMAIN_CHR_TYPE_NULL:
+    case VIR_DOMAIN_CHR_TYPE_STDIO:
+    case VIR_DOMAIN_CHR_TYPE_VC:
+    case VIR_DOMAIN_CHR_TYPE_PTY:
+        if (VIR_STRDUP(*buf, type) < 0)
+            return -1;
+        break;
+
+    case VIR_DOMAIN_CHR_TYPE_FILE:
+    case VIR_DOMAIN_CHR_TYPE_PIPE:
+        if (virAsprintf(buf, "%s:%s", type, srcdef.data.file.path) < 0)
+            return -1;
+        break;
+
+    case VIR_DOMAIN_CHR_TYPE_DEV:
+        if (VIR_STRDUP(*buf, srcdef.data.file.path) < 0)
+            return -1;
+        break;
+
+    case VIR_DOMAIN_CHR_TYPE_UDP: {
+        const char *connectHost = srcdef.data.udp.connectHost;
+        const char *bindHost = srcdef.data.udp.bindHost;
+        const char *bindService  = srcdef.data.udp.bindService;
+
+        if (connectHost == NULL)
+            connectHost = "";
+        if (bindHost == NULL)
+            bindHost = "";
+        if (bindService == NULL)
+            bindService = "0";
+
+        if (virAsprintf(buf, "udp:%s:%s@%s:%s",
+                        connectHost,
+                        srcdef.data.udp.connectService,
+                        bindHost,
+                        bindService) < 0)
+            return -1;
+        break;
+    }
+
+    case VIR_DOMAIN_CHR_TYPE_TCP: {
+        const char *prefix;
+
+        if (srcdef.data.tcp.protocol == VIR_DOMAIN_CHR_TCP_PROTOCOL_TELNET)
+            prefix = "telnet";
+        else
+            prefix = "tcp";
+
+        if (virAsprintf(buf, "%s:%s:%s%s",
+                        prefix,
+                        srcdef.data.tcp.host,
+                        srcdef.data.tcp.service,
+                        srcdef.data.tcp.listen ? ",server,nowait" : "") < 0)
+            return -1;
+        break;
+    }
+
+    case VIR_DOMAIN_CHR_TYPE_UNIX:
+        if (virAsprintf(buf, "unix:%s%s",
+                        srcdef.data.nix.path,
+                        srcdef.data.nix.listen ? ",server,nowait" : "") < 0)
+            return -1;
+        break;
+
+    default:
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("unsupported chardev '%s'"), type);
+        return -1;
+    }
+
+    return 0;
+}
+
 static int
 libxlMakeDomBuildInfo(virDomainObjPtr vm, libxl_domain_config *d_config)
 {
@@ -411,6 +497,24 @@ libxlMakeDomBuildInfo(virDomainObjPtr vm, libxl_domain_config *d_config)
         if (VIR_STRDUP(b_info->u.hvm.boot, bootorder) < 0)
             goto error;
 
+        if (def->nserials) {
+            if (def->nserials > 1) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                               "%s",
+                               _("Only one serial device is supported by libxl"));
+                goto error;
+            }
+            if (libxlMakeChrdevStr(def->serials[0], &b_info->u.hvm.serial) < 0)
+                goto error;
+        }
+
+        if (def->nparallels) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           "%s",
+                           _("Parallel devices are not supported by libxl"));
+            goto error;
+        }
+
         /*
          * The following comment and calculation were taken directly from
          * libxenlight's internal function libxl_get_required_shadow_memory():

src/libxl/libxl_conf.h

@@ -34,6 +34,7 @@
 # include "configmake.h"
 # include "virportallocator.h"
 # include "virobject.h"
+# include "virchrdev.h"
 
 
 # define LIBXL_VNC_PORT_MIN  5900
@@ -94,6 +95,8 @@ struct _libxlDomainObjPrivate {
 
     /* per domain libxl ctx */
     libxl_ctx *ctx;
+    /* console */
+    virChrdevsPtr devs;
     libxl_evgen_domain_death *deathW;
 
     /* list of libxl timeout registrations */

src/libxl/libxl_driver.c

@@ -417,6 +417,9 @@ libxlDomainObjPrivateAlloc(void)
 
     libxl_osevent_register_hooks(priv->ctx, &libxl_event_callbacks, priv);
 
+    if (!(priv->devs = virChrdevAlloc()))
+        return NULL;
+
     return priv;
 }
 
@@ -428,6 +431,7 @@ libxlDomainObjPrivateDispose(void *obj)
     if (priv->deathW)
         libxl_evdisable_domain_death(priv->ctx, priv->deathW);
 
+    virChrdevFree(priv->devs);
     libxl_ctx_free(priv->ctx);
 }
 
@@ -4502,6 +4506,94 @@ cleanup:
     return ret;
 }
 
+
+static int
+libxlDomainOpenConsole(virDomainPtr dom,
+                       const char *dev_name,
+                       virStreamPtr st,
+                       unsigned int flags)
+{
+    libxlDriverPrivatePtr driver = dom->conn->privateData;
+    virDomainObjPtr vm = NULL;
+    int ret = -1;
+    virDomainChrDefPtr chr = NULL;
+    libxlDomainObjPrivatePtr priv;
+    char *console = NULL;
+
+    virCheckFlags(VIR_DOMAIN_CONSOLE_FORCE, -1);
+
+    if (dev_name) {
+        /* XXX support device aliases in future */
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("Named device aliases are not supported"));
+        goto cleanup;
+    }
+
+    libxlDriverLock(driver);
+    vm = virDomainObjListFindByUUID(driver->domains, dom->uuid);
+    libxlDriverUnlock(driver);
+    if (!vm) {
+        char uuidstr[VIR_UUID_STRING_BUFLEN];
+        virUUIDFormat(dom->uuid, uuidstr);
+        virReportError(VIR_ERR_NO_DOMAIN,
+                       _("No domain with matching uuid '%s'"), uuidstr);
+        goto cleanup;
+    }
+
+    if (virDomainOpenConsoleEnsureACL(dom->conn, vm->def) < 0)
+        goto cleanup;
+
+    if (!virDomainObjIsActive(vm)) {
+        virReportError(VIR_ERR_OPERATION_INVALID,
+                       "%s", _("domain is not running"));
+        goto cleanup;
+    }
+
+    priv = vm->privateData;
+
+    if (vm->def->nserials)
+        chr = vm->def->serials[0];
+
+    if (!chr) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("cannot find character device %s"),
+                       NULLSTR(dev_name));
+        goto cleanup;
+    }
+
+    if (chr->source.type != VIR_DOMAIN_CHR_TYPE_PTY) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("character device %s is not using a PTY"),
+                       NULLSTR(dev_name));
+        goto cleanup;
+    }
+
+    ret = libxl_primary_console_get_tty(priv->ctx, vm->def->id, &console);
+    if (ret)
+        goto cleanup;
+
+    if (VIR_STRDUP(chr->source.data.file.path, console) < 0)
+        goto cleanup;
+
+    /* handle mutually exclusive access to console devices */
+    ret = virChrdevOpen(priv->devs,
+                        &chr->source,
+                        st,
+                        (flags & VIR_DOMAIN_CONSOLE_FORCE) != 0);
+
+    if (ret == 1) {
+        virReportError(VIR_ERR_OPERATION_FAILED, "%s",
+                       _("Active console session exists for this domain"));
+        ret = -1;
+    }
+
+cleanup:
+    VIR_FREE(console);
+    if (vm)
+        virObjectUnlock(vm);
+    return ret;
+}
+
 static int
 libxlDomainSetSchedulerParameters(virDomainPtr dom, virTypedParameterPtr params,
                                   int nparams)
@@ -4884,6 +4976,7 @@ static virDriver libxlDriver = {
     .domainManagedSave = libxlDomainManagedSave, /* 0.9.2 */
     .domainHasManagedSaveImage = libxlDomainHasManagedSaveImage, /* 0.9.2 */
     .domainManagedSaveRemove = libxlDomainManagedSaveRemove, /* 0.9.2 */
+    .domainOpenConsole = libxlDomainOpenConsole, /* 1.1.2 */
     .domainIsActive = libxlDomainIsActive, /* 0.9.0 */
     .domainIsPersistent = libxlDomainIsPersistent, /* 0.9.0 */
     .domainIsUpdated = libxlDomainIsUpdated, /* 0.9.0 */