MIPS: KVM: Add kvm_asid_change trace event

Add a trace event for guest ASID changes, replacing the existing
kvm_debug call.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: kvm@vger.kernel.org
Cc: linux-mips@linux-mips.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 25 insertions, 4 deletions

diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c
index fce08bda9ebc..ee0e61d2b6fb 100644
--- a/arch/mips/kvm/emulate.c
+++ b/arch/mips/kvm/emulate.c
@@ -1082,11 +1082,10 @@ enum emulation_result kvm_mips_emulate_CP0(u32 inst, u32 *opc, u32 cause,
                                 if ((KSEGX(vcpu->arch.gprs[rt]) != CKSEG0) &&
                                     ((kvm_read_c0_guest_entryhi(cop0) &
                                       KVM_ENTRYHI_ASID) != nasid)) {
-                                        kvm_debug("MTCz, change ASID from %#lx to %#lx\n",
+                                        trace_kvm_asid_change(vcpu,
                                                 kvm_read_c0_guest_entryhi(cop0)
-                                                & KVM_ENTRYHI_ASID,
-                                                vcpu->arch.gprs[rt]
-                                                & KVM_ENTRYHI_ASID);
+                                                        & KVM_ENTRYHI_ASID,
+                                                nasid);
 
                                         /* Blow away the shadow host TLBs */
                                         kvm_mips_flush_host_tlb(1);
diff --git a/arch/mips/kvm/trace.h b/arch/mips/kvm/trace.h
index ffa6ee8f2025..7daf7474d6a6 100644
--- a/arch/mips/kvm/trace.h
+++ b/arch/mips/kvm/trace.h
@@ -122,6 +122,28 @@ TRACE_EVENT(kvm_aux,
                       __entry->pc)
 );
 
+TRACE_EVENT(kvm_asid_change,
+            TP_PROTO(struct kvm_vcpu *vcpu, unsigned int old_asid,
+                     unsigned int new_asid),
+            TP_ARGS(vcpu, old_asid, new_asid),
+            TP_STRUCT__entry(
+                        __field(unsigned long, pc)
+                        __field(u8, old_asid)
+                        __field(u8, new_asid)
+            ),
+
+            TP_fast_assign(
+                        __entry->pc = vcpu->arch.pc;
+                        __entry->old_asid = old_asid;
+                        __entry->new_asid = new_asid;
+            ),
+
+            TP_printk("PC: 0x%08lx old: 0x%02x new: 0x%02x",
+                      __entry->pc,
+                      __entry->old_asid,
+                      __entry->new_asid)
+);
+
 #endif /* _TRACE_KVM_H */
 
 /* This part must be outside protection */