diff options
Diffstat (limited to 'arch/mips/kvm')
-rw-r--r-- | arch/mips/kvm/mips.c | 13 | ||||
-rw-r--r-- | arch/mips/kvm/trace.h | 37 | ||||
-rw-r--r-- | arch/mips/kvm/vz.c | 21 |
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; |