[PATCH v2 5/8] tools: dynamically attach/detach CQM service for a guest

[dongxiao.xu@intel.com]

From: Dongxiao Xu <dongxiao.xu@intel.com>

Add two new xl instruction for attaching and detaching CQM services
for a running guest.

Above "qos_res" is the monitoring resource type, and current supported
type is "cqm".

Signed-off-by: Jiongxi Li <jiongxi.li@intel.com>
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
---
 tools/libxc/xc_domain.c   |   18 ++++++++++
 tools/libxc/xenctrl.h     |    2 ++
 tools/libxl/Makefile      |    3 +-
 tools/libxl/libxl.h       |    3 ++
 tools/libxl/libxl_pqos.c  |   88 +++++++++++++++++++++++++++++++++++++++++++++
 tools/libxl/xl.h          |    2 ++
 tools/libxl/xl_cmdimpl.c  |   36 +++++++++++++++++++
 tools/libxl/xl_cmdtable.c |   10 ++++++
 8 files changed, 161 insertions(+), 1 deletion(-)
 create mode 100644 tools/libxl/libxl_pqos.c

diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 1ccafc5..85c2d4d 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -1776,6 +1776,24 @@ int xc_domain_set_max_evtchn(xc_interface *xch, uint32_t domid,
     return do_domctl(xch, &domctl);
 }
 
+int xc_domain_pqos_attach(xc_interface *xch, uint32_t domid, int flags)
+{
+    DECLARE_DOMCTL;
+    domctl.cmd = XEN_DOMCTL_attach_pqos;
+    domctl.domain = (domid_t)domid;
+    domctl.u.qos_res.flags = flags;
+    return do_domctl(xch, &domctl);
+}
+
+int xc_domain_pqos_detach(xc_interface *xch, uint32_t domid, int flags)
+{
+    DECLARE_DOMCTL;
+    domctl.cmd = XEN_DOMCTL_detach_pqos;
+    domctl.domain = (domid_t)domid;
+    domctl.u.qos_res.flags = flags;
+    return do_domctl(xch, &domctl);
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 4ac6b8a..a57f147 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -2395,4 +2395,6 @@ int xc_kexec_load(xc_interface *xch, uint8_t type, uint16_t arch,
  */
 int xc_kexec_unload(xc_interface *xch, int type);
 
+int xc_domain_pqos_attach(xc_interface *xch, uint32_t domid, int flags);
+int xc_domain_pqos_detach(xc_interface *xch, uint32_t domid, int flags);
 #endif /* XENCTRL_H */
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index cf214bb..35f0b97 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -74,7 +74,8 @@ LIBXL_OBJS = flexarray.o libxl.o libxl_create.o libxl_dm.o libxl_pci.o \
 			libxl_internal.o libxl_utils.o libxl_uuid.o \
 			libxl_json.o libxl_aoutils.o libxl_numa.o \
 			libxl_save_callout.o _libxl_save_msgs_callout.o \
-			libxl_qmp.o libxl_event.o libxl_fork.o $(LIBXL_OBJS-y)
+			libxl_qmp.o libxl_event.o libxl_fork.o libxl_pqos.o \
+			$(LIBXL_OBJS-y)
 LIBXL_OBJS += _libxl_types.o libxl_flask.o _libxl_types_internal.o
 
 $(LIBXL_OBJS): CFLAGS += $(CFLAGS_LIBXL) -include $(XEN_ROOT)/tools/config.h
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index c7dceda..a9a506f 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -1051,6 +1051,9 @@ int libxl_flask_getenforce(libxl_ctx *ctx);
 int libxl_flask_setenforce(libxl_ctx *ctx, int mode);
 int libxl_flask_loadpolicy(libxl_ctx *ctx, void *policy, uint32_t size);
 
+int libxl_pqos_attach(libxl_ctx *ctx, uint32_t domid, const char * qosres);
+int libxl_pqos_detach(libxl_ctx *ctx, uint32_t domid, const char * qosres);
+
 /* misc */
 
 /* Each of these sets or clears the flag according to whether the
diff --git a/tools/libxl/libxl_pqos.c b/tools/libxl/libxl_pqos.c
new file mode 100644
index 0000000..e92b94b
--- /dev/null
+++ b/tools/libxl/libxl_pqos.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2013      Intel Corporation
+ * Author Jiongxi Li <jiongxi.li@intel.com>
+ * Author Dongxiao Xu <dongxiao.xu@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#include "libxl_osdeps.h" /* must come before any other headers */
+#include "libxl_internal.h"
+
+int libxl_pqos_attach(libxl_ctx *ctx, uint32_t domid, const char * qosres)
+{
+    int rc;
+    int flags = 0;
+
+    if (!strcmp(qosres, "cqm"))
+        flags |= XEN_DOMCTL_ADF_pqos_cqm;
+    else {
+        rc = -EINVAL;
+        fprintf(stderr, "Invalid QoS resource type! "
+                        "Supported types are: \"cqm\".\n");
+        return rc;
+    }
+
+    rc = xc_domain_pqos_attach(ctx->xch, domid, flags);
+    if (rc < 0) {
+        fprintf(stderr, "Failed to attach CQM service to domain %d. ", domid);
+        if (errno == ENODEV)
+            fprintf(stderr, "CQM is not supported in this system.\n");
+        else if (errno == EBUSY)
+            fprintf(stderr, "There is no free CQM RMID available.\n");
+        else if (errno == EINVAL)
+            fprintf(stderr, "Domain %d is already attached with CQM service.\n", domid);
+        else if (errno == ESRCH)
+            fprintf(stderr, "Is Domain %d a valid domain?\n", domid);
+        else
+            fprintf(stderr, "errno: %d\n", errno);
+    }
+
+    return rc;
+}
+
+int libxl_pqos_detach(libxl_ctx *ctx, uint32_t domid, const char * qosres)
+{
+    int rc;
+    int flags = 0;
+
+    if (!strcmp(qosres, "cqm"))
+        flags |= XEN_DOMCTL_ADF_pqos_cqm;
+    else {
+        rc = -EINVAL;
+        fprintf(stderr, "Invalid QoS resource type! "
+                        "Supported types are: \"cqm\".\n");
+        return rc;
+    }
+
+    rc = xc_domain_pqos_detach(ctx->xch, domid, flags);
+    if (rc < 0) {
+        fprintf(stderr, "Failed to detach CQM service to domain %d. ", domid);
+        if (errno == ENODEV)
+            fprintf(stderr, "CQM is not supported in this system.\n");
+        else if (errno == EINVAL)
+            fprintf(stderr, "Domain %d is not attached with CQM service.\n", domid);
+        else if (errno == ESRCH)
+            fprintf(stderr, "Is Domain %d a valid domain?\n", domid);
+        else
+            fprintf(stderr, "errno: %d\n", errno);
+    }
+
+    return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/tools/libxl/xl.h b/tools/libxl/xl.h
index e005c39..78738b9 100644
--- a/tools/libxl/xl.h
+++ b/tools/libxl/xl.h
@@ -105,6 +105,8 @@ int main_getenforce(int argc, char **argv);
 int main_setenforce(int argc, char **argv);
 int main_loadpolicy(int argc, char **argv);
 int main_remus(int argc, char **argv);
+int main_pqosattach(int argc, char **argv);
+int main_pqosdetach(int argc, char **argv);
 
 void help(const char *command);
 
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 84a604f..1a12e8f 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -7195,6 +7195,42 @@ int main_remus(int argc, char **argv)
     return -ERROR_FAIL;
 }
 
+int main_pqosattach(int argc, char **argv)
+{
+    uint32_t domid;
+    int opt, rc;
+    const char *qosres = NULL;
+
+    SWITCH_FOREACH_OPT(opt, "", NULL, "pqos-attach", 2) {
+        /* No options */
+    }
+
+    qosres = argv[optind];
+    domid = find_domain(argv[optind + 1]);
+
+    rc = libxl_pqos_attach(ctx, domid, qosres);
+
+    return rc;
+}
+
+int main_pqosdetach(int argc, char **argv)
+{
+    uint32_t domid;
+    int opt, rc;
+    const char *qosres = NULL;
+
+    SWITCH_FOREACH_OPT(opt, "", NULL, "pqos-detach", 2) {
+        /* No options */
+    }
+
+    qosres = argv[optind];
+    domid = find_domain(argv[optind + 1]);
+
+    rc = libxl_pqos_detach(ctx, domid, qosres);
+
+    return rc;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/xl_cmdtable.c b/tools/libxl/xl_cmdtable.c
index 326a660..02a2572 100644
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -488,6 +488,16 @@ struct cmd_spec cmd_table[] = {
       "                        of the domain."
 
     },
+    { "pqos-attach",
+      &main_pqosattach, 0, 1,
+      "Allocate and map qos resource",
+      "<Resource> <Domain>",
+    },
+    { "pqos-detach",
+      &main_pqosdetach, 0, 1,
+      "Reliquish qos resource",
+      "<Resource> <Domain>",
+    },
 };
 
 int cmdtable_len = sizeof(cmd_table)/sizeof(struct cmd_spec);
-- 
1.7.9.5