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KVM: s390: Add implementation-specific trace events 

Introduce a new trace system, kvm-s390, for some kvm/s390 specific
trace points:

- injection of interrupts
- delivery of interrupts to the guest
- creation/destruction of kvm machines and vcpus
- stop actions for vcpus
- reset requests for userspace

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Cornelia Huck 2012-07-23 17:20:30 +02:00 committed by Avi Kivity
parent 5786fffa96
commit ade38c311a
5 changed files with 241 additions and 0 deletions
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2
arch/s390/kvm/diag.c
View File

@ -15,6 +15,7 @@
#include <linux/kvm_host.h>
#include "kvm-s390.h"
#include "trace.h"
#include "trace-s390.h"
static int diag_release_pages(struct kvm_vcpu *vcpu)
{
@ -99,6 +100,7 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
vcpu->run->exit_reason = KVM_EXIT_S390_RESET;
VCPU_EVENT(vcpu, 3, "requesting userspace resets %llx",
vcpu->run->s390_reset_flags);
trace_kvm_s390_request_resets(vcpu->run->s390_reset_flags);
return -EREMOTE;
}

3
arch/s390/kvm/intercept.c
View File

@ -20,6 +20,7 @@
#include "kvm-s390.h"
#include "gaccess.h"
#include "trace.h"
#include "trace-s390.h"
static int handle_lctlg(struct kvm_vcpu *vcpu)
{
@ -138,6 +139,8 @@ static int handle_stop(struct kvm_vcpu *vcpu)
vcpu->stat.exit_stop_request++;
spin_lock_bh(&vcpu->arch.local_int.lock);
trace_kvm_s390_stop_request(vcpu->arch.local_int.action_bits);
if (vcpu->arch.local_int.action_bits & ACTION_RELOADVCPU_ON_STOP) {
vcpu->arch.local_int.action_bits &= ~ACTION_RELOADVCPU_ON_STOP;
rc = SIE_INTERCEPT_RERUNVCPU;

23
arch/s390/kvm/interrupt.c
View File

@ -19,6 +19,7 @@
#include <asm/uaccess.h>
#include "kvm-s390.h"
#include "gaccess.h"
#include "trace-s390.h"
static int psw_extint_disabled(struct kvm_vcpu *vcpu)
{
@ -130,6 +131,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
case KVM_S390_INT_EMERGENCY:
VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
vcpu->stat.deliver_emergency_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->emerg.code, 0);
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1201);
if (rc == -EFAULT)
exception = 1;
@ -152,6 +155,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
case KVM_S390_INT_EXTERNAL_CALL:
VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
vcpu->stat.deliver_external_call++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->extcall.code, 0);
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x1202);
if (rc == -EFAULT)
exception = 1;
@ -175,6 +180,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
inti->ext.ext_params);
vcpu->stat.deliver_service_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->ext.ext_params, 0);
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2401);
if (rc == -EFAULT)
exception = 1;
@ -198,6 +205,9 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
inti->ext.ext_params, inti->ext.ext_params2);
vcpu->stat.deliver_virtio_interrupt++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->ext.ext_params,
inti->ext.ext_params2);
rc = put_guest_u16(vcpu, __LC_EXT_INT_CODE, 0x2603);
if (rc == -EFAULT)
exception = 1;
@ -229,6 +239,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
case KVM_S390_SIGP_STOP:
VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
vcpu->stat.deliver_stop_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
0, 0);
__set_intercept_indicator(vcpu, inti);
break;
@ -236,12 +248,16 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
inti->prefix.address);
vcpu->stat.deliver_prefix_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->prefix.address, 0);
kvm_s390_set_prefix(vcpu, inti->prefix.address);
break;
case KVM_S390_RESTART:
VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
vcpu->stat.deliver_restart_signal++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
0, 0);
rc = copy_to_guest(vcpu, offsetof(struct _lowcore,
restart_old_psw), &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
if (rc == -EFAULT)
@ -259,6 +275,8 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
inti->pgm.code,
table[vcpu->arch.sie_block->ipa >> 14]);
vcpu->stat.deliver_program_int++;
trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
inti->pgm.code, 0);
rc = put_guest_u16(vcpu, __LC_PGM_INT_CODE, inti->pgm.code);
if (rc == -EFAULT)
exception = 1;
@ -515,6 +533,7 @@ int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
inti->pgm.code = code;
VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
spin_lock_bh(&li->lock);
list_add(&inti->list, &li->list);
atomic_set(&li->active, 1);
@ -556,6 +575,8 @@ int kvm_s390_inject_vm(struct kvm *kvm,
kfree(inti);
return -EINVAL;
}
trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
2);
mutex_lock(&kvm->lock);
fi = &kvm->arch.float_int;
@ -621,6 +642,8 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
kfree(inti);
return -EINVAL;
}
trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
s390int->parm64, 2);
mutex_lock(&vcpu->kvm->lock);
li = &vcpu->arch.local_int;

3
arch/s390/kvm/kvm-s390.c
View File

@ -34,6 +34,7 @@
#define CREATE_TRACE_POINTS
#include "trace.h"
#include "trace-s390.h"
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
@ -245,6 +246,7 @@ out_err:
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
VCPU_EVENT(vcpu, 3, "%s", "free cpu");
trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
if (!kvm_is_ucontrol(vcpu->kvm)) {
clear_bit(63 - vcpu->vcpu_id,
(unsigned long *) &vcpu->kvm->arch.sca->mcn);
@ -420,6 +422,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
goto out_free_sie_block;
VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
vcpu->arch.sie_block);
trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
return vcpu;
out_free_sie_block:

210
arch/s390/kvm/trace-s390.h Normal file
View File

@ -0,0 +1,210 @@
#if !defined(_TRACE_KVMS390_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_KVMS390_H
#include <linux/tracepoint.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM kvm-s390
#define TRACE_INCLUDE_PATH .
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_FILE trace-s390
/*
* Trace point for the creation of the kvm instance.
*/
TRACE_EVENT(kvm_s390_create_vm,
TP_PROTO(unsigned long type),
TP_ARGS(type),
TP_STRUCT__entry(
__field(unsigned long, type)
),
TP_fast_assign(
__entry->type = type;
),
TP_printk("create vm%s",
__entry->type & KVM_VM_S390_UCONTROL ? " (UCONTROL)" : "")
);
/*
* Trace points for creation and destruction of vpcus.
*/
TRACE_EVENT(kvm_s390_create_vcpu,
TP_PROTO(unsigned int id, struct kvm_vcpu *vcpu,
struct kvm_s390_sie_block *sie_block),
TP_ARGS(id, vcpu, sie_block),
TP_STRUCT__entry(
__field(unsigned int, id)
__field(struct kvm_vcpu *, vcpu)
__field(struct kvm_s390_sie_block *, sie_block)
),
TP_fast_assign(
__entry->id = id;
__entry->vcpu = vcpu;
__entry->sie_block = sie_block;
),
TP_printk("create cpu %d at %p, sie block at %p", __entry->id,
__entry->vcpu, __entry->sie_block)
);
TRACE_EVENT(kvm_s390_destroy_vcpu,
TP_PROTO(unsigned int id),
TP_ARGS(id),
TP_STRUCT__entry(
__field(unsigned int, id)
),
TP_fast_assign(
__entry->id = id;
),
TP_printk("destroy cpu %d", __entry->id)
);
/*
* Trace points for injection of interrupts, either per machine or
* per vcpu.
*/
#define kvm_s390_int_type \
{KVM_S390_SIGP_STOP, "sigp stop"}, \
{KVM_S390_PROGRAM_INT, "program interrupt"}, \
{KVM_S390_SIGP_SET_PREFIX, "sigp set prefix"}, \
{KVM_S390_RESTART, "sigp restart"}, \
{KVM_S390_INT_VIRTIO, "virtio interrupt"}, \
{KVM_S390_INT_SERVICE, "sclp interrupt"}, \
{KVM_S390_INT_EMERGENCY, "sigp emergency"}, \
{KVM_S390_INT_EXTERNAL_CALL, "sigp ext call"}
TRACE_EVENT(kvm_s390_inject_vm,
TP_PROTO(__u64 type, __u32 parm, __u64 parm64, int who),
TP_ARGS(type, parm, parm64, who),
TP_STRUCT__entry(
__field(__u32, inttype)
__field(__u32, parm)
__field(__u64, parm64)
__field(int, who)
),
TP_fast_assign(
__entry->inttype = type & 0x00000000ffffffff;
__entry->parm = parm;
__entry->parm64 = parm64;
__entry->who = who;
),
TP_printk("inject%s: type:%x (%s) parm:%x parm64:%llx",
(__entry->who == 1) ? " (from kernel)" :
(__entry->who == 2) ? " (from user)" : "",
__entry->inttype,
__print_symbolic(__entry->inttype, kvm_s390_int_type),
__entry->parm, __entry->parm64)
);
TRACE_EVENT(kvm_s390_inject_vcpu,
TP_PROTO(unsigned int id, __u64 type, __u32 parm, __u64 parm64, \
int who),
TP_ARGS(id, type, parm, parm64, who),
TP_STRUCT__entry(
__field(int, id)
__field(__u32, inttype)
__field(__u32, parm)
__field(__u64, parm64)
__field(int, who)
),
TP_fast_assign(
__entry->id = id;
__entry->inttype = type & 0x00000000ffffffff;
__entry->parm = parm;
__entry->parm64 = parm64;
__entry->who = who;
),
TP_printk("inject%s (vcpu %d): type:%x (%s) parm:%x parm64:%llx",
(__entry->who == 1) ? " (from kernel)" :
(__entry->who == 2) ? " (from user)" : "",
__entry->id, __entry->inttype,
__print_symbolic(__entry->inttype, kvm_s390_int_type),
__entry->parm, __entry->parm64)
);
/*
* Trace point for the actual delivery of interrupts.
*/
TRACE_EVENT(kvm_s390_deliver_interrupt,
TP_PROTO(unsigned int id, __u64 type, __u32 data0, __u64 data1),
TP_ARGS(id, type, data0, data1),
TP_STRUCT__entry(
__field(int, id)
__field(__u32, inttype)
__field(__u32, data0)
__field(__u64, data1)
),
TP_fast_assign(
__entry->id = id;
__entry->inttype = type & 0x00000000ffffffff;
__entry->data0 = data0;
__entry->data1 = data1;
),
TP_printk("deliver interrupt (vcpu %d): type:%x (%s) " \
"data:%08x %016llx",
__entry->id, __entry->inttype,
__print_symbolic(__entry->inttype, kvm_s390_int_type),
__entry->data0, __entry->data1)
);
/*
* Trace point for resets that may be requested from userspace.
*/
TRACE_EVENT(kvm_s390_request_resets,
TP_PROTO(__u64 resets),
TP_ARGS(resets),
TP_STRUCT__entry(
__field(__u64, resets)
),
TP_fast_assign(
__entry->resets = resets;
),
TP_printk("requesting userspace resets %llx",
__entry->resets)
);
/*
* Trace point for a vcpu's stop requests.
*/
TRACE_EVENT(kvm_s390_stop_request,
TP_PROTO(unsigned int action_bits),
TP_ARGS(action_bits),
TP_STRUCT__entry(
__field(unsigned int, action_bits)
),
TP_fast_assign(
__entry->action_bits = action_bits;
),
TP_printk("stop request, action_bits = %08x",
__entry->action_bits)
);
#endif /* _TRACE_KVMS390_H */
/* This part must be outside protection */
#include <trace/define_trace.h>