KVM: PPC: Move EXIT_DEBUG partially to tracepoints

We have a debug printk on every exit that is usually #ifdef'ed out. Using
tracepoints makes a lot more sense here though, as they can be dynamically
enabled.

This patch converts the most commonly used debug printks of EXIT_DEBUG to
tracepoints.

Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 55 insertions, 22 deletions

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 7656b6df0d8b..37db61d37041 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -17,6 +17,7 @@
 #include <linux/kvm_host.h>
 #include <linux/err.h>
 #include <linux/slab.h>
+#include "trace.h"
 
 #include <asm/reg.h>
 #include <asm/cputable.h>
@@ -35,7 +36,6 @@
 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
 
 /* #define EXIT_DEBUG */
-/* #define EXIT_DEBUG_SIMPLE */
 /* #define DEBUG_EXT */
 
 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
@@ -105,14 +105,6 @@ void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
         kvmppc_giveup_ext(vcpu, MSR_VSX);
 }
 
-#if defined(EXIT_DEBUG)
-static u32 kvmppc_get_dec(struct kvm_vcpu *vcpu)
-{
-        u64 jd = mftb() - vcpu->arch.dec_jiffies;
-        return vcpu->arch.dec - jd;
-}
-#endif
-
 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 {
         ulong smsr = vcpu->arch.shared->msr;
@@ -850,16 +842,8 @@ int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 
         run->exit_reason = KVM_EXIT_UNKNOWN;
         run->ready_for_interrupt_injection = 1;
-#ifdef EXIT_DEBUG
-        printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | dar=0x%lx | dec=0x%x | msr=0x%lx\n",
-                exit_nr, kvmppc_get_pc(vcpu), kvmppc_get_fault_dar(vcpu),
-                kvmppc_get_dec(vcpu), to_svcpu(vcpu)->shadow_srr1);
-#elif defined (EXIT_DEBUG_SIMPLE)
-        if ((exit_nr != 0x900) && (exit_nr != 0x500))
-                printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | dar=0x%lx | msr=0x%lx\n",
-                        exit_nr, kvmppc_get_pc(vcpu), kvmppc_get_fault_dar(vcpu),
-                        vcpu->arch.shared->msr);
-#endif
+
+        trace_kvm_book3s_exit(exit_nr, vcpu);
         kvm_resched(vcpu);
         switch (exit_nr) {
         case BOOK3S_INTERRUPT_INST_STORAGE:
@@ -1091,9 +1075,7 @@ program_interrupt:
                 }
         }
 
-#ifdef EXIT_DEBUG
-        printk(KERN_EMERG "KVM exit: vcpu=0x%p pc=0x%lx r=0x%x\n", vcpu, kvmppc_get_pc(vcpu), r);
-#endif
+        trace_kvm_book3s_reenter(r, vcpu);
 
         return r;
 }
diff --git a/arch/powerpc/kvm/trace.h b/arch/powerpc/kvm/trace.h
index a8e840018052..b5e9d81a1ea2 100644
--- a/arch/powerpc/kvm/trace.h
+++ b/arch/powerpc/kvm/trace.h
@@ -98,6 +98,57 @@ TRACE_EVENT(kvm_gtlb_write,
                 __entry->word1, __entry->word2)
 );
 
+
+/*************************************************************************
+ *                         Book3S trace points                           *
+ *************************************************************************/
+
+#ifdef CONFIG_PPC_BOOK3S
+
+TRACE_EVENT(kvm_book3s_exit,
+        TP_PROTO(unsigned int exit_nr, struct kvm_vcpu *vcpu),
+        TP_ARGS(exit_nr, vcpu),
+
+        TP_STRUCT__entry(
+                __field(        unsigned int,   exit_nr         )
+                __field(        unsigned long,  pc              )
+                __field(        unsigned long,  msr             )
+                __field(        unsigned long,  dar             )
+                __field(        unsigned long,  srr1            )
+        ),
+
+        TP_fast_assign(
+                __entry->exit_nr        = exit_nr;
+                __entry->pc             = kvmppc_get_pc(vcpu);
+                __entry->dar            = kvmppc_get_fault_dar(vcpu);
+                __entry->msr            = vcpu->arch.shared->msr;
+                __entry->srr1           = to_svcpu(vcpu)->shadow_srr1;
+        ),
+
+        TP_printk("exit=0x%x | pc=0x%lx | msr=0x%lx | dar=0x%lx | srr1=0x%lx",
+                  __entry->exit_nr, __entry->pc, __entry->msr, __entry->dar,
+                  __entry->srr1)
+);
+
+TRACE_EVENT(kvm_book3s_reenter,
+        TP_PROTO(int r, struct kvm_vcpu *vcpu),
+        TP_ARGS(r, vcpu),
+
+        TP_STRUCT__entry(
+                __field(        unsigned int,   r               )
+                __field(        unsigned long,  pc              )
+        ),
+
+        TP_fast_assign(
+                __entry->r              = r;
+                __entry->pc             = kvmppc_get_pc(vcpu);
+        ),
+
+        TP_printk("reentry r=%d | pc=0x%lx", __entry->r, __entry->pc)
+);
+
+#endif /* CONFIG_PPC_BOOK3S */
+
 #endif /* _TRACE_KVM_H */
 
 /* This part must be outside protection */