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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 09/16] x86/VPMU: Interface for setting PMU mode and flags
Add runtime interface for setting PMU mode and flags. Three main modes are
provided:
* PMU off
* PMU on: Guests can access PMU MSRs and receive PMU interrupts. dom0
profiles itself and the hypervisor.
* dom0-only PMU: dom0 collects samples for both itself and guests.
For feature flags only Intel's BTS is currently supported.
Mode and flags are set via HYPERVISOR_xenpmu_op hypercall.
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
xen/arch/x86/hvm/svm/vpmu.c | 2 +-
xen/arch/x86/hvm/vmx/vpmu_core2.c | 4 +-
xen/arch/x86/hvm/vpmu.c | 77 ++++++++++++++++++++++++++++++++++----
xen/arch/x86/x86_64/compat/entry.S | 4 ++
xen/arch/x86/x86_64/entry.S | 4 ++
xen/include/asm-x86/hvm/vpmu.h | 9 +----
xen/include/public/xen.h | 1 +
xen/include/public/xenpmu.h | 58 ++++++++++++++++++++++++++++
xen/include/xen/hypercall.h | 4 ++
9 files changed, 145 insertions(+), 18 deletions(-)
diff --git a/xen/arch/x86/hvm/svm/vpmu.c b/xen/arch/x86/hvm/svm/vpmu.c
index 78979aa..1369d74 100644
--- a/xen/arch/x86/hvm/svm/vpmu.c
+++ b/xen/arch/x86/hvm/svm/vpmu.c
@@ -471,7 +471,7 @@ int svm_vpmu_initialise(struct vcpu *v, unsigned int
vpmu_flags)
int ret = 0;
/* vpmu enabled? */
- if ( !vpmu_flags )
+ if ( vpmu_flags == XENPMU_MODE_OFF )
return 0;
switch ( family )
diff --git a/xen/arch/x86/hvm/vmx/vpmu_core2.c
b/xen/arch/x86/hvm/vmx/vpmu_core2.c
index e756d87..5670924 100644
--- a/xen/arch/x86/hvm/vmx/vpmu_core2.c
+++ b/xen/arch/x86/hvm/vmx/vpmu_core2.c
@@ -706,7 +706,7 @@ static int core2_vpmu_initialise(struct vcpu *v, unsigned
int vpmu_flags)
u64 msr_content;
struct cpuinfo_x86 *c = ¤t_cpu_data;
- if ( !(vpmu_flags & VPMU_BOOT_BTS) )
+ if ( !(vpmu_flags & (XENPMU_FEATURE_INTEL_BTS << XENPMU_FEATURE_SHIFT)) )
goto func_out;
/* Check the 'Debug Store' feature in the CPUID.EAX[1]:EDX[21] */
if ( cpu_has(c, X86_FEATURE_DS) )
@@ -825,7 +825,7 @@ int vmx_vpmu_initialise(struct vcpu *v, unsigned int
vpmu_flags)
int ret = 0;
vpmu->arch_vpmu_ops = &core2_no_vpmu_ops;
- if ( !vpmu_flags )
+ if ( vpmu_flags == XENPMU_MODE_OFF )
return 0;
if ( family == 6 )
diff --git a/xen/arch/x86/hvm/vpmu.c b/xen/arch/x86/hvm/vpmu.c
index 99eb654..c83256f 100644
--- a/xen/arch/x86/hvm/vpmu.c
+++ b/xen/arch/x86/hvm/vpmu.c
@@ -21,6 +21,7 @@
#include <xen/config.h>
#include <xen/sched.h>
#include <xen/xenoprof.h>
+#include <xen/guest_access.h>
#include <asm/regs.h>
#include <asm/types.h>
#include <asm/msr.h>
@@ -38,7 +39,7 @@
* "vpmu=off" : vpmu generally disabled
* "vpmu=bts" : vpmu enabled and Intel BTS feature switched on.
*/
-static unsigned int __read_mostly opt_vpmu_enabled;
+uint32_t __read_mostly vpmu_mode = XENPMU_MODE_OFF;
static void parse_vpmu_param(char *s);
custom_param("vpmu", parse_vpmu_param);
@@ -52,7 +53,7 @@ static void __init parse_vpmu_param(char *s)
break;
default:
if ( !strcmp(s, "bts") )
- opt_vpmu_enabled |= VPMU_BOOT_BTS;
+ vpmu_mode |= XENPMU_FEATURE_INTEL_BTS << XENPMU_FEATURE_SHIFT;
else if ( *s )
{
printk("VPMU: unknown flag: %s - vpmu disabled!\n", s);
@@ -60,7 +61,7 @@ static void __init parse_vpmu_param(char *s)
}
/* fall through */
case 1:
- opt_vpmu_enabled |= VPMU_BOOT_ENABLED;
+ vpmu_mode |= XENPMU_MODE_ON;
break;
}
}
@@ -234,19 +235,19 @@ void vpmu_initialise(struct vcpu *v)
switch ( vendor )
{
case X86_VENDOR_AMD:
- if ( svm_vpmu_initialise(v, opt_vpmu_enabled) != 0 )
- opt_vpmu_enabled = 0;
+ if ( svm_vpmu_initialise(v, vpmu_mode) != 0 )
+ vpmu_mode = XENPMU_MODE_OFF;
return;
case X86_VENDOR_INTEL:
- if ( vmx_vpmu_initialise(v, opt_vpmu_enabled) != 0 )
- opt_vpmu_enabled = 0;
+ if ( vmx_vpmu_initialise(v, vpmu_mode) != 0 )
+ vpmu_mode = XENPMU_MODE_OFF;
return;
default:
printk("VPMU: Initialization failed. "
"Unknown CPU vendor %d\n", vendor);
- opt_vpmu_enabled = 0;
+ vpmu_mode = XENPMU_MODE_OFF;
return;
}
@@ -270,3 +271,63 @@ void vpmu_dump(struct vcpu *v)
vpmu->arch_vpmu_ops->arch_vpmu_dump(v);
}
+long do_xenpmu_op(int op, XEN_GUEST_HANDLE_PARAM(xenpmu_params_t) arg)
+{
+ int ret = -EINVAL;
+ xenpmu_params_t pmu_params;
+ uint32_t mode;
+
+ switch ( op )
+ {
+ case XENPMU_mode_set:
+ if ( !is_control_domain(current->domain) )
+ return -EPERM;
+
+ if ( copy_from_guest(&pmu_params, arg, 1) )
+ return -EFAULT;
+
+ mode = (uint32_t)pmu_params.val & XENPMU_MODE_MASK;
+ if ( mode & ~XENPMU_MODE_ON )
+ return -EINVAL;
+
+ vpmu_mode &= ~XENPMU_MODE_MASK;
+ vpmu_mode |= mode;
+
+ ret = 0;
+ break;
+
+ case XENPMU_mode_get:
+ pmu_params.val = vpmu_mode & XENPMU_MODE_MASK;
+ pmu_params.version.maj = XENPMU_VER_MAJ;
+ pmu_params.version.min = XENPMU_VER_MIN;
+ if ( copy_to_guest(arg, &pmu_params, 1) )
+ return -EFAULT;
+ ret = 0;
+ break;
+
+ case XENPMU_feature_set:
+ if ( !is_control_domain(current->domain) )
+ return -EPERM;
+
+ if ( copy_from_guest(&pmu_params, arg, 1) )
+ return -EFAULT;
+
+ if ( (uint32_t)pmu_params.val & ~XENPMU_FEATURE_INTEL_BTS )
+ return -EINVAL;
+
+ vpmu_mode &= ~XENPMU_FEATURE_MASK;
+ vpmu_mode |= (uint32_t)pmu_params.val << XENPMU_FEATURE_SHIFT;
+
+ ret = 0;
+ break;
+
+ case XENPMU_feature_get:
+ pmu_params.val = vpmu_mode & XENPMU_FEATURE_MASK;
+ if ( copy_to_guest(arg, &pmu_params, 1) )
+ return -EFAULT;
+ ret = 0;
+ break;
+ }
+
+ return ret;
+}
diff --git a/xen/arch/x86/x86_64/compat/entry.S
b/xen/arch/x86/x86_64/compat/entry.S
index 594b0b9..07c736d 100644
--- a/xen/arch/x86/x86_64/compat/entry.S
+++ b/xen/arch/x86/x86_64/compat/entry.S
@@ -416,6 +416,8 @@ ENTRY(compat_hypercall_table)
.quad do_domctl
.quad compat_kexec_op
.quad do_tmem_op
+ .quad do_ni_hypercall /* reserved for XenClient */
+ .quad do_xenpmu_op /* 40 */
.rept __HYPERVISOR_arch_0-((.-compat_hypercall_table)/8)
.quad compat_ni_hypercall
.endr
@@ -464,6 +466,8 @@ ENTRY(compat_hypercall_args_table)
.byte 1 /* do_domctl */
.byte 2 /* compat_kexec_op */
.byte 1 /* do_tmem_op */
+ .byte 0 /* reserved for XenClient */
+ .byte 2 /* do_xenpmu_op */ /* 40 */
.rept __HYPERVISOR_arch_0-(.-compat_hypercall_args_table)
.byte 0 /* compat_ni_hypercall */
.endr
diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index 3ea4683..c36ffce 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -757,6 +757,8 @@ ENTRY(hypercall_table)
.quad do_domctl
.quad do_kexec_op
.quad do_tmem_op
+ .quad do_ni_hypercall /* reserved for XenClient */
+ .quad do_xenpmu_op /* 40 */
.rept __HYPERVISOR_arch_0-((.-hypercall_table)/8)
.quad do_ni_hypercall
.endr
@@ -805,6 +807,8 @@ ENTRY(hypercall_args_table)
.byte 1 /* do_domctl */
.byte 2 /* do_kexec */
.byte 1 /* do_tmem_op */
+ .byte 0 /* reserved for XenClient */
+ .byte 2 /* do_xenpmu_op */ /* 40 */
.rept __HYPERVISOR_arch_0-(.-hypercall_args_table)
.byte 0 /* do_ni_hypercall */
.endr
diff --git a/xen/include/asm-x86/hvm/vpmu.h b/xen/include/asm-x86/hvm/vpmu.h
index 6d641ea..022a171 100644
--- a/xen/include/asm-x86/hvm/vpmu.h
+++ b/xen/include/asm-x86/hvm/vpmu.h
@@ -24,13 +24,6 @@
#include <public/xenpmu.h>
-/*
- * Flag bits given as a string on the hypervisor boot parameter 'vpmu'.
- * See arch/x86/hvm/vpmu.c.
- */
-#define VPMU_BOOT_ENABLED 0x1 /* vpmu generally enabled. */
-#define VPMU_BOOT_BTS 0x2 /* Intel BTS feature wanted. */
-
#define vcpu_vpmu(vcpu) (&((vcpu)->arch.vpmu))
#define vpmu_vcpu(vpmu) (container_of((vpmu), struct vcpu, arch.vpmu))
@@ -95,5 +88,7 @@ void vpmu_dump(struct vcpu *v);
extern int acquire_pmu_ownership(int pmu_ownership);
extern void release_pmu_ownership(int pmu_ownership);
+extern uint32_t vpmu_mode;
+
#endif /* __ASM_X86_HVM_VPMU_H_*/
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index 8c5697e..a00ab21 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -101,6 +101,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
#define __HYPERVISOR_kexec_op 37
#define __HYPERVISOR_tmem_op 38
#define __HYPERVISOR_xc_reserved_op 39 /* reserved for XenClient */
+#define __HYPERVISOR_xenpmu_op 40
/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0 48
diff --git a/xen/include/public/xenpmu.h b/xen/include/public/xenpmu.h
index bcadd15..faf05fc 100644
--- a/xen/include/public/xenpmu.h
+++ b/xen/include/public/xenpmu.h
@@ -13,6 +13,64 @@
#define XENPMU_VER_MAJ 0
#define XENPMU_VER_MIN 0
+/*
+ * ` enum neg_errnoval
+ * ` HYPERVISOR_xenpmu_op(enum xenpmu_op cmd, struct xenpmu_params *args);
+ *
+ * @cmd == XENPMU_* (PMU operation)
+ * @args == struct xenpmu_params
+ */
+/* ` enum xenpmu_op { */
+#define XENPMU_mode_get 0 /* Also used for getting PMU version */
+#define XENPMU_mode_set 1
+#define XENPMU_feature_get 2
+#define XENPMU_feature_set 3
+/* ` } */
+
+/* ANSI-C does not support anonymous unions */
+#if !defined(__GNUC__) || defined(__STRICT_ANSI__)
+#define __ANON_UNION_NAME(x) x
+#else
+#define __ANON_UNION_NAME(x)
+#endif
+
+/* Parameters structure for HYPERVISOR_xenpmu_op call */
+struct xenpmu_params {
+ /* IN/OUT parameters */
+ union {
+ struct version {
+ uint8_t maj;
+ uint8_t min;
+ } version;
+ uint64_t pad;
+ } __ANON_UNION_NAME(v);
+ union {
+ uint64_t val;
+ XEN_GUEST_HANDLE(void) valp;
+ } __ANON_UNION_NAME(d);
+
+ /* IN parameters */
+ uint64_t vcpu;
+};
+typedef struct xenpmu_params xenpmu_params_t;
+DEFINE_XEN_GUEST_HANDLE(xenpmu_params_t);
+
+/* PMU modes:
+ * - XENPMU_MODE_OFF: No PMU virtualization
+ * - XENPMU_MODE_ON: Guests can profile themselves, dom0 profiles
+ * itself and Xen
+ */
+#define XENPMU_FEATURE_SHIFT 16
+#define XENPMU_MODE_MASK ((1U << XENPMU_FEATURE_SHIFT) - 1)
+#define XENPMU_MODE_OFF 0
+#define XENPMU_MODE_ON (1<<0)
+
+/*
+ * PMU features:
+ * - XENPMU_FEATURE_INTEL_BTS: Intel BTS support (ignored on AMD)
+ */
+#define XENPMU_FEATURE_MASK ((uint32_t)(~XENPMU_MODE_MASK))
+#define XENPMU_FEATURE_INTEL_BTS 1
/* Shared between hypervisor and PV domain */
struct xenpmu_data {
diff --git a/xen/include/xen/hypercall.h b/xen/include/xen/hypercall.h
index a9e5229..4b49084 100644
--- a/xen/include/xen/hypercall.h
+++ b/xen/include/xen/hypercall.h
@@ -14,6 +14,7 @@
#include <public/event_channel.h>
#include <public/tmem.h>
#include <public/version.h>
+#include <public/xenpmu.h>
#include <asm/hypercall.h>
#include <xsm/xsm.h>
@@ -139,6 +140,9 @@ do_tmem_op(
extern long
do_xenoprof_op(int op, XEN_GUEST_HANDLE_PARAM(void) arg);
+extern long
+do_xenpmu_op(int op, XEN_GUEST_HANDLE_PARAM(xenpmu_params_t) arg);
+
#ifdef CONFIG_COMPAT
extern int
--
1.8.1.4
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