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[Xen-devel] [PATCH v17 10/10] tools: CMDs and APIs for Cache Monitoring Technology



Introduced some new xl commands to enable/disable Cache Monitoring
Technology(CMT) feature.

The following two commands is to attach/detach the CMT feature
to/from a certain domain.

$ xl psr-cmt-attach domid
$ xl psr-cmt-detach domid

This command is to display the CMT information, such as L3 cache
occupancy.

$ xl psr-cmt-show cache_occupancy <domid>

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
Signed-off-by: Chao Peng <chao.p.peng@xxxxxxxxxxxxxxx>
---
 docs/man/xl.pod.1           |   25 +++++
 tools/libxc/Makefile        |    1 +
 tools/libxc/xc_msr_x86.h    |   36 ++++++++
 tools/libxc/xc_psr.c        |  214 +++++++++++++++++++++++++++++++++++++++++++
 tools/libxc/xenctrl.h       |   17 ++++
 tools/libxl/Makefile        |    2 +-
 tools/libxl/libxl.h         |   19 ++++
 tools/libxl/libxl_psr.c     |  184 +++++++++++++++++++++++++++++++++++++
 tools/libxl/libxl_types.idl |    4 +
 tools/libxl/libxl_utils.c   |   28 ++++++
 tools/libxl/xl.h            |    3 +
 tools/libxl/xl_cmdimpl.c    |  132 ++++++++++++++++++++++++++
 tools/libxl/xl_cmdtable.c   |   17 ++++
 13 files changed, 681 insertions(+), 1 deletion(-)
 create mode 100644 tools/libxc/xc_msr_x86.h
 create mode 100644 tools/libxc/xc_psr.c
 create mode 100644 tools/libxl/libxl_psr.c

diff --git a/docs/man/xl.pod.1 b/docs/man/xl.pod.1
index f1e95db..ef8cd24 100644
--- a/docs/man/xl.pod.1
+++ b/docs/man/xl.pod.1
@@ -1387,6 +1387,31 @@ Load FLASK policy from the given policy file. The 
initial policy is provided to
 the hypervisor as a multiboot module; this command allows runtime updates to 
the
 policy. Loading new security policy will reset runtime changes to device 
labels.
 
+=head1 Cache Monitoring Technology
+
+Some new hardware may offer monitoring capability in each logical processor to
+measure specific platform shared resource metric, for example, L3 cache
+occupancy. In Xen implementation, the monitoring granularity is domain level.
+To monitor a specific domain, just attach the domain id with the monitoring
+service. When the domain doesn't need to be monitored any more, detach the
+domain id from the monitoring service.
+
+=over 4
+
+=item B<psr-cmt-attach> [I<domain-id>]
+
+attach: Attach the platform shared resource monitoring service to a domain.
+
+=item B<psr-cmt-detach> [I<domain-id>]
+
+detach: Detach the platform shared resource monitoring service from a domain.
+
+=item B<psr-cmt-show> [I<psr-monitor-type>] [I<domain-id>]
+
+Show monitoring data for a certain domain or all domains. Current supported
+monitor types are:
+ - "cache-occupancy": showing the L3 cache occupancy.
+
 =back
 
 =head1 TO BE DOCUMENTED
diff --git a/tools/libxc/Makefile b/tools/libxc/Makefile
index dde6109..d8cc21b 100644
--- a/tools/libxc/Makefile
+++ b/tools/libxc/Makefile
@@ -35,6 +35,7 @@ CTRL_SRCS-y       += xc_kexec.c
 CTRL_SRCS-y       += xtl_core.c
 CTRL_SRCS-y       += xtl_logger_stdio.c
 CTRL_SRCS-y       += xc_resource.c
+CTRL_SRCS-y       += xc_psr.c
 CTRL_SRCS-$(CONFIG_X86) += xc_pagetab.c
 CTRL_SRCS-$(CONFIG_Linux) += xc_linux.c xc_linux_osdep.c
 CTRL_SRCS-$(CONFIG_FreeBSD) += xc_freebsd.c xc_freebsd_osdep.c
diff --git a/tools/libxc/xc_msr_x86.h b/tools/libxc/xc_msr_x86.h
new file mode 100644
index 0000000..1e0ee99
--- /dev/null
+++ b/tools/libxc/xc_msr_x86.h
@@ -0,0 +1,36 @@
+/*
+ * xc_msr_x86.h
+ *
+ * MSR definition macros
+ *
+ * Copyright (C) 2014      Intel Corporation
+ * Author Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef XC_MSR_X86_H
+#define XC_MSR_X86_H
+
+#define MSR_IA32_QOSEVTSEL      0x00000c8d
+#define MSR_IA32_QMC            0x00000c8e
+
+#endif
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/tools/libxc/xc_psr.c b/tools/libxc/xc_psr.c
new file mode 100644
index 0000000..e333ea4
--- /dev/null
+++ b/tools/libxc/xc_psr.c
@@ -0,0 +1,214 @@
+/*
+ * xc_psr.c
+ *
+ * platform shared resource related API functions.
+ *
+ * Copyright (C) 2014      Intel Corporation
+ * Author Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
+ *
+ * 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 "xc_private.h"
+#include "xc_msr_x86.h"
+
+#define IA32_QM_CTR_ERROR_MASK         (0x3ull << 62)
+
+#define EVTID_L3_OCCUPANCY             0x1
+
+int xc_psr_cmt_attach(xc_interface *xch, uint32_t domid)
+{
+    DECLARE_DOMCTL;
+
+    domctl.cmd = XEN_DOMCTL_psr_cmt_op;
+    domctl.domain = (domid_t)domid;
+    domctl.u.psr_cmt_op.cmd = XEN_DOMCTL_PSR_CMT_OP_ATTACH;
+
+    return do_domctl(xch, &domctl);
+}
+
+int xc_psr_cmt_detach(xc_interface *xch, uint32_t domid)
+{
+    DECLARE_DOMCTL;
+
+    domctl.cmd = XEN_DOMCTL_psr_cmt_op;
+    domctl.domain = (domid_t)domid;
+    domctl.u.psr_cmt_op.cmd = XEN_DOMCTL_PSR_CMT_OP_DETACH;
+
+    return do_domctl(xch, &domctl);
+}
+
+int xc_psr_cmt_get_domain_rmid(xc_interface *xch, uint32_t domid,
+                                    uint32_t *rmid)
+{
+    int rc;
+    DECLARE_DOMCTL;
+
+    domctl.cmd = XEN_DOMCTL_psr_cmt_op;
+    domctl.domain = (domid_t)domid;
+    domctl.u.psr_cmt_op.cmd = XEN_DOMCTL_PSR_CMT_OP_QUERY_RMID;
+
+    rc = do_domctl(xch, &domctl);
+
+    if ( !rc )
+        *rmid = domctl.u.psr_cmt_op.data;
+
+    return rc;
+}
+
+int xc_psr_cmt_get_total_rmid(xc_interface *xch, uint32_t *total_rmid)
+{
+    static int val = 0;
+    int rc;
+    DECLARE_SYSCTL;
+
+    if ( val )
+    {
+        *total_rmid = val;
+        return 0;
+    }
+
+    sysctl.cmd = XEN_SYSCTL_psr_cmt_op;
+    sysctl.u.psr_cmt_op.cmd = XEN_SYSCTL_PSR_CMT_get_total_rmid;
+    sysctl.u.psr_cmt_op.flags = 0;
+
+    rc = xc_sysctl(xch, &sysctl);
+    if ( !rc )
+        val = *total_rmid = sysctl.u.psr_cmt_op.data;
+
+    return rc;
+}
+
+int xc_psr_cmt_get_l3_upscaling_factor(xc_interface *xch,
+                                            uint32_t *upscaling_factor)
+{
+    static int val = 0;
+    int rc;
+    DECLARE_SYSCTL;
+
+    if ( val )
+    {
+        *upscaling_factor = val;
+        return 0;
+    }
+
+    sysctl.cmd = XEN_SYSCTL_psr_cmt_op;
+    sysctl.u.psr_cmt_op.cmd =
+        XEN_SYSCTL_PSR_CMT_get_l3_upscaling_factor;
+    sysctl.u.psr_cmt_op.flags = 0;
+
+    rc = xc_sysctl(xch, &sysctl);
+    if ( !rc )
+        val = *upscaling_factor = sysctl.u.psr_cmt_op.data;
+
+    return rc;
+}
+
+int xc_psr_cmt_get_l3_cache_size(xc_interface *xch,
+                                      uint32_t *l3_cache_size)
+{
+    static int val = 0;
+    int rc;
+    DECLARE_SYSCTL;
+
+    if ( val )
+    {
+        *l3_cache_size = val;
+        return 0;
+    }
+
+    sysctl.cmd = XEN_SYSCTL_psr_cmt_op;
+    sysctl.u.psr_cmt_op.cmd =
+        XEN_SYSCTL_PSR_CMT_get_l3_cache_size;
+    sysctl.u.psr_cmt_op.flags = 0;
+
+    rc = xc_sysctl(xch, &sysctl);
+    if ( !rc )
+        val = *l3_cache_size= sysctl.u.psr_cmt_op.data;
+
+    return rc;
+}
+
+int xc_psr_cmt_get_data(xc_interface *xch, uint32_t rmid,
+    uint32_t cpu, xc_psr_cmt_type type, uint64_t *monitor_data)
+{
+    xc_resource_op_t op;
+    xc_resource_entry_t entries[2];
+    uint32_t evtid;
+    int rc;
+
+    switch ( type )
+    {
+    case XC_PSR_CMT_L3_OCCUPANCY:
+        evtid = EVTID_L3_OCCUPANCY;
+        break;
+    default:
+        return -1;
+    }
+
+    entries[0].cmd = XEN_RESOURCE_OP_MSR_WRITE;
+    entries[0].idx = MSR_IA32_QOSEVTSEL;
+    entries[0].val = (uint64_t)rmid << 32 | evtid;
+    entries[0].rsvd = 0;
+
+    entries[1].cmd = XEN_RESOURCE_OP_MSR_READ;
+    entries[1].idx = MSR_IA32_QMC;
+    entries[1].val = 0;
+    entries[1].rsvd = 0;
+
+    op.cpu = cpu;
+    op.nr_entries = 2;
+    op.entries = entries;
+
+    rc = xc_resource_op(xch, 1, &op);
+    if ( rc )
+        return rc;
+
+    if ( op.result || entries[1].val & IA32_QM_CTR_ERROR_MASK )
+        return -1;
+
+    *monitor_data = entries[1].val;
+
+    return 0;
+}
+
+int xc_psr_cmt_enabled(xc_interface *xch)
+{
+    static int val = -1;
+    int rc;
+    DECLARE_SYSCTL;
+
+    if ( val >= 0 )
+        return val;
+
+    sysctl.cmd = XEN_SYSCTL_psr_cmt_op;
+    sysctl.u.psr_cmt_op.cmd = XEN_SYSCTL_PSR_CMT_enabled;
+    sysctl.u.psr_cmt_op.flags = 0;
+
+    rc = do_sysctl(xch, &sysctl);
+    if ( !rc )
+    {
+        val = sysctl.u.psr_cmt_op.data;
+        return val;
+    }
+
+    return 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 6edb738..b0ab6f4 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -2672,6 +2672,23 @@ struct xc_resource_op {
 typedef struct xc_resource_op xc_resource_op_t;
 int xc_resource_op(xc_interface *xch, uint32_t nr_ops, xc_resource_op_t *ops);
 
+enum xc_psr_cmt_type {
+    XC_PSR_CMT_L3_OCCUPANCY,
+};
+typedef enum xc_psr_cmt_type xc_psr_cmt_type;
+int xc_psr_cmt_attach(xc_interface *xch, uint32_t domid);
+int xc_psr_cmt_detach(xc_interface *xch, uint32_t domid);
+int xc_psr_cmt_get_domain_rmid(xc_interface *xch, uint32_t domid,
+    uint32_t *rmid);
+int xc_psr_cmt_get_total_rmid(xc_interface *xch, uint32_t *total_rmid);
+int xc_psr_cmt_get_l3_upscaling_factor(xc_interface *xch,
+    uint32_t *upscaling_factor);
+int xc_psr_cmt_get_l3_cache_size(xc_interface *xch,
+    uint32_t *l3_cache_size);
+int xc_psr_cmt_get_data(xc_interface *xch, uint32_t rmid,
+    uint32_t cpu, uint32_t psr_cmt_type, uint64_t *monitor_data);
+int xc_psr_cmt_enabled(xc_interface *xch);
+
 #endif /* XENCTRL_H */
 
 /*
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index 990414b..fd9ae28 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -43,7 +43,7 @@ LIBXL_OBJS-y += libxl_blktap2.o
 else
 LIBXL_OBJS-y += libxl_noblktap2.o
 endif
-LIBXL_OBJS-$(CONFIG_X86) += libxl_cpuid.o libxl_x86.o
+LIBXL_OBJS-$(CONFIG_X86) += libxl_cpuid.o libxl_x86.o libxl_psr.o
 LIBXL_OBJS-$(CONFIG_ARM) += libxl_nocpuid.o libxl_arm.o
 
 ifeq ($(CONFIG_NetBSD),y)
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index bc68cac..5acc933 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -640,6 +640,13 @@ typedef uint8_t libxl_mac[6];
 #define LIBXL_MAC_BYTES(mac) mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]
 void libxl_mac_copy(libxl_ctx *ctx, libxl_mac *dst, libxl_mac *src);
 
+/*
+ * LIBXL_HAVE_PSR_CMT
+ *
+ * If this is defined, the Cache Monitoring Technology feature is supported.
+ */
+#define LIBXL_HAVE_PSR_CMT 1
+
 typedef char **libxl_string_list;
 void libxl_string_list_dispose(libxl_string_list *sl);
 int libxl_string_list_length(const libxl_string_list *sl);
@@ -1380,6 +1387,18 @@ bool libxl_ms_vm_genid_is_zero(const libxl_ms_vm_genid 
*id);
 void libxl_ms_vm_genid_copy(libxl_ctx *ctx, libxl_ms_vm_genid *dst,
                             libxl_ms_vm_genid *src);
 
+int libxl_get_socket_cpu(libxl_ctx *ctx, uint32_t socketid);
+
+int libxl_psr_cmt_attach(libxl_ctx *ctx, uint32_t domid);
+int libxl_psr_cmt_detach(libxl_ctx *ctx, uint32_t domid);
+int libxl_psr_cmt_domain_attached(libxl_ctx *ctx, uint32_t domid);
+int libxl_psr_cmt_enabled(libxl_ctx *ctx);
+int libxl_psr_cmt_get_total_rmid(libxl_ctx *ctx, uint32_t *total_rmid);
+int libxl_psr_cmt_get_l3_cache_size(libxl_ctx *ctx,
+    uint32_t *l3_cache_size);
+int libxl_psr_cmt_get_cache_occupancy(libxl_ctx *ctx, uint32_t domid,
+    uint32_t socketid, uint32_t *l3_cache_occupancy);
+
 /* misc */
 
 /* Each of these sets or clears the flag according to whether the
diff --git a/tools/libxl/libxl_psr.c b/tools/libxl/libxl_psr.c
new file mode 100644
index 0000000..5551be8
--- /dev/null
+++ b/tools/libxl/libxl_psr.c
@@ -0,0 +1,184 @@
+/*
+ * Copyright (C) 2014      Intel Corporation
+ * Author Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
+ *
+ * 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"
+
+
+#define IA32_QM_CTR_ERROR_MASK         (0x3ul << 62)
+
+static void libxl_psr_cmt_err_msg(libxl_ctx *ctx, int err)
+{
+    GC_INIT(ctx);
+
+    char *msg;
+
+    switch (err) {
+    case ENOSYS:
+        msg = "unsupported operation";
+        break;
+    case ENODEV:
+        msg = "Cache Monitoring Technology is not supported in this system";
+        break;
+    case EEXIST:
+        msg = "Cache Monitoring Technology is already attached to this domain";
+        break;
+    case ENOENT:
+        msg = "Cache Monitoring Technology is not attached to this domain";
+        break;
+    case EUSERS:
+        msg = "there is no free RMID available";
+        break;
+    case ESRCH:
+        msg = "is this Domain ID valid?";
+        break;
+    case EFAULT:
+        msg = "failed to exchange data with Xen";
+        break;
+    default:
+        msg = "unknown error";
+        break;
+    }
+
+    LOGE(ERROR, "%s", msg);
+
+    GC_FREE;
+}
+
+int libxl_psr_cmt_attach(libxl_ctx *ctx, uint32_t domid)
+{
+    int rc;
+
+    rc = xc_psr_cmt_attach(ctx->xch, domid);
+    if (rc < 0) {
+        libxl_psr_cmt_err_msg(ctx, errno);
+        return ERROR_FAIL;
+    }
+
+    return 0;
+}
+
+int libxl_psr_cmt_detach(libxl_ctx *ctx, uint32_t domid)
+{
+    int rc;
+
+    rc = xc_psr_cmt_detach(ctx->xch, domid);
+    if (rc < 0) {
+        libxl_psr_cmt_err_msg(ctx, errno);
+        return ERROR_FAIL;
+    }
+
+    return 0;
+}
+
+int libxl_psr_cmt_domain_attached(libxl_ctx *ctx, uint32_t domid)
+{
+    int rc;
+    uint32_t rmid;
+
+    rc = xc_psr_cmt_get_domain_rmid(ctx->xch, domid, &rmid);
+    if (rc < 0)
+        return 0;
+
+    return !!rmid;
+}
+
+int libxl_psr_cmt_enabled(libxl_ctx *ctx)
+{
+    return xc_psr_cmt_enabled(ctx->xch);
+}
+
+int libxl_psr_cmt_get_total_rmid(libxl_ctx *ctx, uint32_t *total_rmid)
+{
+    int rc;
+
+    rc = xc_psr_cmt_get_total_rmid(ctx->xch, total_rmid);
+    if (rc < 0) {
+        libxl_psr_cmt_err_msg(ctx, errno);
+        return ERROR_FAIL;
+    }
+
+    return 0;
+}
+
+int libxl_psr_cmt_get_l3_cache_size(libxl_ctx *ctx,
+                                         uint32_t *l3_cache_size)
+{
+    int rc;
+
+    rc = xc_psr_cmt_get_l3_cache_size(ctx->xch, l3_cache_size);
+    if (rc < 0) {
+        libxl_psr_cmt_err_msg(ctx, errno);
+        return ERROR_FAIL;
+    }
+
+    return 0;
+}
+
+int libxl_psr_cmt_get_cache_occupancy(libxl_ctx *ctx, uint32_t domid,
+    uint32_t socketid, uint32_t *l3_cache_occupancy)
+{
+    GC_INIT(ctx);
+
+    unsigned int rmid;
+    uint32_t upscaling_factor;
+    uint64_t monitor_data;
+    int cpu, rc;
+    xc_psr_cmt_type type;
+
+    rc = xc_psr_cmt_get_domain_rmid(ctx->xch, domid, &rmid);
+    if (rc < 0 || rmid == 0) {
+        LOGE(ERROR, "fail to get the domain rmid, "
+            "or domain is not attached with platform QoS monitoring service");
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
+    cpu = libxl_get_socket_cpu(ctx, socketid);
+    if (cpu < 0) {
+        LOGE(ERROR, "failed to get socket cpu");
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
+    type = XC_PSR_CMT_L3_OCCUPANCY;
+    rc = xc_psr_cmt_get_data(ctx->xch, rmid, cpu, type, &monitor_data);
+    if (rc < 0) {
+        LOGE(ERROR, "failed to get monitoring data");
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
+    rc = xc_psr_cmt_get_l3_upscaling_factor(ctx->xch, &upscaling_factor);
+    if (rc < 0) {
+        LOGE(ERROR, "failed to get L3 upscaling factor");
+        rc = ERROR_FAIL;
+        goto out;
+    }
+
+    *l3_cache_occupancy = upscaling_factor * monitor_data / 1024;
+    rc = 0;
+out:
+    GC_FREE;
+    return 0;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index f1fcbc3..27a5022 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -635,3 +635,7 @@ libxl_event = Struct("event",[
                                  ])),
            ("domain_create_console_available", None),
            ]))])
+
+libxl_psr_cmt_type = Enumeration("psr_cmt_type", [
+    (1, "CACHE_OCCUPANCY"),
+    ])
diff --git a/tools/libxl/libxl_utils.c b/tools/libxl/libxl_utils.c
index 58df4f3..318a996 100644
--- a/tools/libxl/libxl_utils.c
+++ b/tools/libxl/libxl_utils.c
@@ -1065,6 +1065,34 @@ int libxl__random_bytes(libxl__gc *gc, uint8_t *buf, 
size_t len)
     return ret;
 }
 
+int libxl_get_socket_cpu(libxl_ctx *ctx, uint32_t socketid)
+{
+    int i, j, cpu, nr_cpus;
+    libxl_cputopology *topology;
+    int *socket_cpus;
+
+    topology = libxl_get_cpu_topology(ctx, &nr_cpus);
+    if (!topology)
+        return ERROR_FAIL;
+
+    socket_cpus = malloc(sizeof(int) * nr_cpus);
+    if (!socket_cpus) {
+        libxl_cputopology_list_free(topology, nr_cpus);
+        return ERROR_FAIL;
+    }
+
+    for (i = 0, j = 0; i < nr_cpus; i++)
+        if (topology[i].socket == socketid)
+            socket_cpus[j++] = i;
+
+    /* load balance among cpus in the same socket. */
+    cpu = socket_cpus[rand() % j];
+
+    free(socket_cpus);
+    libxl_cputopology_list_free(topology, nr_cpus);
+    return cpu;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/xl.h b/tools/libxl/xl.h
index 10a2e66..abb1fac 100644
--- a/tools/libxl/xl.h
+++ b/tools/libxl/xl.h
@@ -110,6 +110,9 @@ int main_loadpolicy(int argc, char **argv);
 int main_remus(int argc, char **argv);
 #endif
 int main_devd(int argc, char **argv);
+int main_psr_cmt_attach(int argc, char **argv);
+int main_psr_cmt_detach(int argc, char **argv);
+int main_psr_cmt_show(int argc, char **argv);
 
 void help(const char *command);
 
diff --git a/tools/libxl/xl_cmdimpl.c b/tools/libxl/xl_cmdimpl.c
index 698b3bc..77f19d7 100644
--- a/tools/libxl/xl_cmdimpl.c
+++ b/tools/libxl/xl_cmdimpl.c
@@ -7428,6 +7428,138 @@ out:
     return ret;
 }
 
+static int psr_cmt_show_cache_occupancy(uint32_t domid)
+{
+    uint32_t i, socketid, nr_sockets, total_rmid;
+    uint32_t l3_cache_size, l3_cache_occupancy;
+    libxl_physinfo info;
+    char *domain_name;
+    int rc, print_header, nr_domains;
+    libxl_dominfo *dominfo;
+
+    if (!libxl_psr_cmt_enabled(ctx)) {
+        printf("CMT is disabled in the system\n");
+        return -1;
+    }
+
+    rc = libxl_get_physinfo(ctx, &info);
+    if (rc < 0) {
+        printf("Failed getting physinfo, rc: %d\n", rc);
+        return -1;
+    }
+    nr_sockets = info.nr_cpus / info.threads_per_core / info.cores_per_socket;
+
+    rc = libxl_psr_cmt_get_total_rmid(ctx, &total_rmid);
+    if (rc < 0) {
+        printf("Failed to get max RMID value\n");
+        return -1;
+    }
+
+    rc = libxl_psr_cmt_get_l3_cache_size(ctx, &l3_cache_size);
+    if (rc < 0) {
+        printf("Failed to get system l3 cache size\n");
+        return -1;
+    }
+
+    printf("Total RMID: %d\n", total_rmid);
+    printf("Per-Socket L3 Cache Size: %d KB\n", l3_cache_size);
+
+    print_header = 1;
+    if (!(dominfo = libxl_list_domain(ctx, &nr_domains))) {
+        fprintf(stderr, "libxl_list_domain failed.\n");
+        return -1;
+    }
+    for (i = 0; i < nr_domains; i++) {
+        if (domid != ~0 && dominfo[i].domid != domid)
+            continue;
+        if (!libxl_psr_cmt_domain_attached(ctx, dominfo[i].domid))
+            continue;
+        if (print_header) {
+            printf("%-40s %5s", "Name", "ID");
+            for (socketid = 0; socketid < nr_sockets; socketid++)
+                printf("%14s %d", "Socket", socketid);
+            printf("\n");
+            print_header = 0;
+        }
+        domain_name = libxl_domid_to_name(ctx, dominfo[i].domid);
+        printf("%-40s %5d", domain_name, dominfo[i].domid);
+        free(domain_name);
+        for (socketid = 0; socketid < nr_sockets; socketid++) {
+            rc = libxl_psr_cmt_get_cache_occupancy(ctx, dominfo[i].domid,
+                     socketid, &l3_cache_occupancy);
+            if ( !rc )
+                printf("%13u KB", l3_cache_occupancy);
+        }
+        printf("\n");
+    }
+    libxl_dominfo_list_free(dominfo, nr_domains);
+
+    return 0;
+}
+
+int main_psr_cmt_attach(int argc, char **argv)
+{
+    uint32_t domid;
+    int opt, ret = 0;
+
+    SWITCH_FOREACH_OPT(opt, "", NULL, "psr-cmt-attach", 1) {
+        /* No options */
+    }
+
+    domid = find_domain(argv[optind]);
+    ret = libxl_psr_cmt_attach(ctx, domid);
+
+    return ret;
+}
+
+int main_psr_cmt_detach(int argc, char **argv)
+{
+    uint32_t domid;
+    int opt, ret = 0;
+
+    SWITCH_FOREACH_OPT(opt, "", NULL, "psr-cmt-detach", 1) {
+        /* No options */
+    }
+
+    domid = find_domain(argv[optind]);
+    ret = libxl_psr_cmt_detach(ctx, domid);
+
+    return ret;
+}
+
+int main_psr_cmt_show(int argc, char **argv)
+{
+    int opt, ret = 0;
+    uint32_t domid;
+    libxl_psr_cmt_type type;
+
+    SWITCH_FOREACH_OPT(opt, "", NULL, "psr-cmt-show", 1) {
+        /* No options */
+    }
+
+    libxl_psr_cmt_type_from_string(argv[optind], &type);
+
+    if (optind + 1 >= argc)
+        domid = ~0;
+    else if (optind + 1 == argc - 1)
+        domid = find_domain(argv[optind + 1]);
+    else {
+        help("psr-cmt-show");
+        return 2;
+    }
+
+    switch (type) {
+    case LIBXL_PSR_CMT_TYPE_CACHE_OCCUPANCY:
+        ret = psr_cmt_show_cache_occupancy(domid);
+        break;
+    default:
+        help("psr-cmt-show");
+        return 2;
+    }
+
+    return ret;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/libxl/xl_cmdtable.c b/tools/libxl/xl_cmdtable.c
index 35f02c4..da25c3f 100644
--- a/tools/libxl/xl_cmdtable.c
+++ b/tools/libxl/xl_cmdtable.c
@@ -502,6 +502,23 @@ struct cmd_spec cmd_table[] = {
       "[options]",
       "-F                      Run in the foreground",
     },
+    { "psr-cmt-attach",
+      &main_psr_cmt_attach, 0, 1,
+      "Attach Cache Monitoring Technology service to a domain",
+      "<Domain>",
+    },
+    { "psr-cmt-detach",
+      &main_psr_cmt_detach, 0, 1,
+      "Detach Cache Monitoring Technology service from a domain",
+      "<Domain>",
+    },
+    { "psr-cmt-show",
+      &main_psr_cmt_show, 0, 1,
+      "Show Cache Monitoring Technology information",
+      "<PSR-CMT-Type> <Domain>",
+      "Available monitor types:\n"
+      "\"cache_occupancy\":         Show L3 cache occupancy\n",
+    },
 };
 
 int cmdtable_len = sizeof(cmd_table)/sizeof(struct cmd_spec);
-- 
1.7.9.5


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