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Date: Tue, 10 Sep 2013 11:31:47 -0400
From: Boris Ostrovsky <boris.ostrovsky@...cle.com>
To: xen-devel@...ts.xen.org
Cc: konrad.wilk@...cle.com, david.vrabel@...rix.com, JBeulich@...e.com,
linux-kernel@...r.kernel.org,
Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: [PATCH v1 2/5] xen/PMU: Sysfs interface for setting Xen PMU mode
Set Xen's PMU mode via /sys/hypervisor/pmu/pmu_mode. Add XENPMU hypercall.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>
---
arch/x86/include/asm/xen/hypercall.h | 6 ++
arch/x86/xen/xen-head.S | 5 +-
drivers/xen/sys-hypervisor.c | 118 +++++++++++++++++++++++++++++++++++
include/xen/interface/xen.h | 1 +
include/xen/interface/xenpmu.h | 44 +++++++++++++
5 files changed, 173 insertions(+), 1 deletion(-)
create mode 100644 include/xen/interface/xenpmu.h
diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
index e709884..f022cef 100644
--- a/arch/x86/include/asm/xen/hypercall.h
+++ b/arch/x86/include/asm/xen/hypercall.h
@@ -465,6 +465,12 @@ HYPERVISOR_tmem_op(
return _hypercall1(int, tmem_op, op);
}
+static inline int
+HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
+{
+ return _hypercall2(int, xenpmu_op, op, arg);
+}
+
static inline void
MULTI_fpu_taskswitch(struct multicall_entry *mcl, int set)
{
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 7faed58..f2415e6 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -73,8 +73,11 @@ NEXT_HYPERCALL(sysctl)
NEXT_HYPERCALL(domctl)
NEXT_HYPERCALL(kexec_op)
NEXT_HYPERCALL(tmem_op) /* 38 */
+ENTRY(xenclient_rsvd)
+ .skip 32
+NEXT_HYPERCALL(xenpmu_op) /* 40 */
ENTRY(xen_hypercall_rsvr)
- .skip 320
+ .skip 256
NEXT_HYPERCALL(mca) /* 48 */
NEXT_HYPERCALL(arch_1)
NEXT_HYPERCALL(arch_2)
diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
index 96453f8..2218154 100644
--- a/drivers/xen/sys-hypervisor.c
+++ b/drivers/xen/sys-hypervisor.c
@@ -20,6 +20,7 @@
#include <xen/xenbus.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
+#include <xen/interface/xenpmu.h>
#define HYPERVISOR_ATTR_RO(_name) \
static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
@@ -368,6 +369,115 @@ static void xen_properties_destroy(void)
sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
}
+struct pmu_mode {
+ const char *name;
+ uint32_t mode;
+};
+struct pmu_mode pmu_modes[] = {
+ {"enable", VPMU_ON},
+ {"priv_enable", VPMU_PRIV},
+ {"disable", 0}
+};
+static ssize_t pmu_mode_store(struct hyp_sysfs_attr *attr,
+ const char *buffer, size_t len)
+{
+ int ret;
+ struct xenpmu_params xp;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
+ if (!strncmp(buffer, pmu_modes[i].name,
+ strlen(pmu_modes[i].name))) {
+ xp.control = pmu_modes[i].mode;
+ break;
+ }
+ }
+
+ if (i == ARRAY_SIZE(pmu_modes))
+ return -EINVAL;
+
+ ret = HYPERVISOR_xenpmu_op(XENPMU_mode_set, &xp);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t pmu_mode_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ int ret;
+ struct xenpmu_params xp;
+ int i;
+ uint32_t mode;
+
+ ret = HYPERVISOR_xenpmu_op(XENPMU_mode_get, &xp);
+ if (ret)
+ return ret;
+
+ mode = (uint32_t)xp.control & VPMU_MODE_MASK;
+ for (i = 0; i < ARRAY_SIZE(pmu_modes); i++) {
+ if (mode == pmu_modes[i].mode)
+ return sprintf(buffer, "%s\n", pmu_modes[i].name);
+ }
+
+ return -EINVAL;
+}
+HYPERVISOR_ATTR_RW(pmu_mode);
+
+
+static ssize_t pmu_flags_store(struct hyp_sysfs_attr *attr,
+ const char *buffer, size_t len)
+{
+ int ret;
+ uint32_t flags;
+ struct xenpmu_params xp;
+
+ ret = kstrtou32(buffer, 0, &flags);
+ if (ret)
+ return ret;
+
+ xp.control = flags;
+ ret = HYPERVISOR_xenpmu_op(XENPMU_flags_set, &xp);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t pmu_flags_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ int ret;
+ struct xenpmu_params xp;
+
+ ret = HYPERVISOR_xenpmu_op(XENPMU_flags_get, &xp);
+ if (ret)
+ return ret;
+
+ return sprintf(buffer, "0x%x\n", (uint32_t)xp.control);
+}
+HYPERVISOR_ATTR_RW(pmu_flags);
+
+static struct attribute *xen_pmu_attrs[] = {
+ &pmu_mode_attr.attr,
+ &pmu_flags_attr.attr,
+ NULL
+};
+
+static const struct attribute_group xen_pmu_group = {
+ .name = "pmu",
+ .attrs = xen_pmu_attrs,
+};
+
+static int __init xen_pmu_init(void)
+{
+ return sysfs_create_group(hypervisor_kobj, &xen_pmu_group);
+}
+
+static void xen_pmu_destroy(void)
+{
+ sysfs_remove_group(hypervisor_kobj, &xen_pmu_group);
+}
+
static int __init hyper_sysfs_init(void)
{
int ret;
@@ -390,9 +500,16 @@ static int __init hyper_sysfs_init(void)
ret = xen_properties_init();
if (ret)
goto prop_out;
+ if (xen_initial_domain()) {
+ ret = xen_pmu_init();
+ if (ret)
+ goto pmu_out;
+ }
goto out;
+pmu_out:
+ xen_properties_destroy();
prop_out:
xen_sysfs_uuid_destroy();
uuid_out:
@@ -407,6 +524,7 @@ out:
static void __exit hyper_sysfs_exit(void)
{
+ xen_pmu_destroy();
xen_properties_destroy();
xen_compilation_destroy();
xen_sysfs_uuid_destroy();
diff --git a/include/xen/interface/xen.h b/include/xen/interface/xen.h
index 53ec416..c29d427 100644
--- a/include/xen/interface/xen.h
+++ b/include/xen/interface/xen.h
@@ -58,6 +58,7 @@
#define __HYPERVISOR_physdev_op 33
#define __HYPERVISOR_hvm_op 34
#define __HYPERVISOR_tmem_op 38
+#define __HYPERVISOR_xenpmu_op 40
/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0 48
diff --git a/include/xen/interface/xenpmu.h b/include/xen/interface/xenpmu.h
new file mode 100644
index 0000000..63c42b1
--- /dev/null
+++ b/include/xen/interface/xenpmu.h
@@ -0,0 +1,44 @@
+#ifndef __XEN_PUBLIC_XENPMU_H__
+#define __XEN_PUBLIC_XENPMU_H__
+
+#include <asm/msr.h>
+
+#include "xen.h"
+
+#define XENPMU_VER_MAJ 0
+#define XENPMU_VER_MIN 0
+
+/* HYPERVISOR_xenpmu_op commands */
+#define XENPMU_mode_get 0
+#define XENPMU_mode_set 1
+#define XENPMU_flags_get 2
+#define XENPMU_flags_set 3
+
+/* Parameter structure for HYPERVISOR_xenpmu_op call */
+struct xenpmu_params {
+ union {
+ struct version {
+ uint8_t maj;
+ uint8_t min;
+ } version;
+ uint64_t pad;
+ };
+ uint64_t control;
+};
+
+/* VPMU modes */
+#define VPMU_MODE_MASK 0xff
+#define VPMU_OFF 0
+/* guests can profile themselves, (dom0 profiles itself and Xen) */
+#define VPMU_ON (1<<0)
+/*
+ * Only dom0 has access to VPMU and it profiles everyone: itself,
+ * the hypervisor and the guests.
+ */
+#define VPMU_PRIV (1<<1)
+
+/* VPMU flags */
+#define VPMU_FLAGS_MASK ((uint32_t)(~VPMU_MODE_MASK))
+#define VPMU_INTEL_BTS (1<<8) /* Ignored on AMD */
+
+#endif /* __XEN_PUBLIC_XENPMU_H__ */
--
1.8.1.4
--
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