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-rw-r--r--arch/mips/kvm/mips.c13
-rw-r--r--arch/mips/kvm/trace.h37
-rw-r--r--arch/mips/kvm/vz.c21
3 files changed, 69 insertions, 2 deletions
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index e8ddb128b8ad..1fc6fef463db 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -76,6 +76,19 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{NULL}
};
+bool kvm_trace_guest_mode_change;
+
+int kvm_guest_mode_change_trace_reg(void)
+{
+ kvm_trace_guest_mode_change = 1;
+ return 0;
+}
+
+void kvm_guest_mode_change_trace_unreg(void)
+{
+ kvm_trace_guest_mode_change = 0;
+}
+
/*
* XXXKYMA: We are simulatoring a processor that has the WII bit set in
* Config7, so we are "runnable" if interrupts are pending
diff --git a/arch/mips/kvm/trace.h b/arch/mips/kvm/trace.h
index affde8a2c584..a8c7fd7bf6d2 100644
--- a/arch/mips/kvm/trace.h
+++ b/arch/mips/kvm/trace.h
@@ -18,6 +18,13 @@
#define TRACE_INCLUDE_FILE trace
/*
+ * arch/mips/kvm/mips.c
+ */
+extern bool kvm_trace_guest_mode_change;
+int kvm_guest_mode_change_trace_reg(void);
+void kvm_guest_mode_change_trace_unreg(void);
+
+/*
* Tracepoints for VM enters
*/
DECLARE_EVENT_CLASS(kvm_transition,
@@ -303,6 +310,36 @@ TRACE_EVENT(kvm_guestid_change,
__entry->guestid)
);
+TRACE_EVENT_FN(kvm_guest_mode_change,
+ TP_PROTO(struct kvm_vcpu *vcpu),
+ TP_ARGS(vcpu),
+ TP_STRUCT__entry(
+ __field(unsigned long, epc)
+ __field(unsigned long, pc)
+ __field(unsigned long, badvaddr)
+ __field(unsigned int, status)
+ __field(unsigned int, cause)
+ ),
+
+ TP_fast_assign(
+ __entry->epc = kvm_read_c0_guest_epc(vcpu->arch.cop0);
+ __entry->pc = vcpu->arch.pc;
+ __entry->badvaddr = kvm_read_c0_guest_badvaddr(vcpu->arch.cop0);
+ __entry->status = kvm_read_c0_guest_status(vcpu->arch.cop0);
+ __entry->cause = kvm_read_c0_guest_cause(vcpu->arch.cop0);
+ ),
+
+ TP_printk("EPC: 0x%08lx PC: 0x%08lx Status: 0x%08x Cause: 0x%08x BadVAddr: 0x%08lx",
+ __entry->epc,
+ __entry->pc,
+ __entry->status,
+ __entry->cause,
+ __entry->badvaddr),
+
+ kvm_guest_mode_change_trace_reg,
+ kvm_guest_mode_change_trace_unreg
+);
+
#endif /* _TRACE_KVM_H */
/* This part must be outside protection */
diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
index 44dad9ae5d02..33bb8c6e1b05 100644
--- a/arch/mips/kvm/vz.c
+++ b/arch/mips/kvm/vz.c
@@ -1322,6 +1322,18 @@ static enum emulation_result kvm_trap_vz_handle_gsfc(u32 cause, u32 *opc,
return er;
}
+static enum emulation_result kvm_trap_vz_handle_ghfc(u32 cause, u32 *opc,
+ struct kvm_vcpu *vcpu)
+{
+ /*
+ * Presumably this is due to MC (guest mode change), so lets trace some
+ * relevant info.
+ */
+ trace_kvm_guest_mode_change(vcpu);
+
+ return EMULATE_DONE;
+}
+
static enum emulation_result kvm_trap_vz_handle_hc(u32 cause, u32 *opc,
struct kvm_vcpu *vcpu)
{
@@ -1407,8 +1419,7 @@ static int kvm_trap_vz_handle_guest_exit(struct kvm_vcpu *vcpu)
break;
case MIPS_GCTL0_GEXC_GHFC:
++vcpu->stat.vz_ghfc_exits;
- er = kvm_trap_vz_no_handler_guest_exit(gexccode, cause, opc,
- vcpu);
+ er = kvm_trap_vz_handle_ghfc(cause, opc, vcpu);
break;
case MIPS_GCTL0_GEXC_GPA:
++vcpu->stat.vz_gpa_exits;
@@ -2459,6 +2470,12 @@ static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
*/
kvm_vz_restore_timer(vcpu);
+ /* Set MC bit if we want to trace guest mode changes */
+ if (kvm_trace_guest_mode_change)
+ set_c0_guestctl0(MIPS_GCTL0_MC);
+ else
+ clear_c0_guestctl0(MIPS_GCTL0_MC);
+
/* Don't bother restoring registers multiple times unless necessary */
if (!all)
return 0;