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[libvirt] [PATCH V5] 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>
---
Changes since V4:
1), using proper error instead of VIR_ERR_INTERNAL_ERROR.
2), treat safe as unsupported flags in libxl openConsole api.
3), some format and minor logic changes.

Changes since V3:
implicity forbit dev_name pass to libxl driver due to only one
console supported by libxl.

Changes since V2:
1), forbid parallel configure because libxl do not support it
2), only support one serial on libxl driver.
3), also remove console code in libxl driver, AFAICS serial is enough for
connecting to libxl console.

Changes since V1:
1), add virDomainOpenConsoleEnsureACL
3), remove virReportOOMErrorFull when virAsprintf fail.
4), change size_t for non-nagetive number in libxlDomainOpenConsole
    size_t i;
    size_t num = 0;
5), fix for make check
(1), replace virAsprintf with VIR_STRDUP in two places
(2), delete space.

 src/libxl/libxl_conf.c   | 104 +++++++++++++++++++++++++++++++++++++++++++++++
 src/libxl/libxl_conf.h   |   3 ++
 src/libxl/libxl_driver.c |  93 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 200 insertions(+)

diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 5273a26..827dfdd 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -331,6 +331,92 @@ error:
 }
 
 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)
 {
     virDomainDefPtr def = vm->def;
@@ -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():
diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
index 942cdd5..aa57710 100644
--- a/src/libxl/libxl_conf.h
+++ b/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 */
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 98b1985..0d42062 100644
--- a/src/libxl/libxl_driver.c
+++ b/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);
 }
 
@@ -4493,6 +4497,94 @@ 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)
@@ -4875,6 +4967,7 @@ 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 */
-- 
1.8.1.4


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