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MIPS: KVM: Add guest mode switch trace events

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Add a few trace events for entering and coming out of guest mode, as well
as re-entering it from a guest exit exception.

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>
This commit is contained in:
James Hogan 2016-06-14 09:40:14 +01:00 committed by Paolo Bonzini
parent 9887d1c75b
commit 93258604ab
2 changed files with 52 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
arch/mips/kvm/mips.c
View file

@ -410,7 +410,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
/* Disable hardware page table walking while in guest */
htw_stop();
trace_kvm_enter(vcpu);
r = vcpu->arch.vcpu_run(run, vcpu);
trace_kvm_out(vcpu);
/* Re-enable HTW before enabling interrupts */
htw_start();
@ -1389,6 +1391,8 @@ int kvm_mips_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
}
if (ret == RESUME_GUEST) {
trace_kvm_reenter(vcpu);
/*
* If FPU / MSA are enabled (i.e. the guest's FPU / MSA context
* is live), restore FCR31 / MSACSR.

48
arch/mips/kvm/trace.h
View file

@ -17,6 +17,54 @@
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE trace
/*
* Tracepoints for VM enters
*/
TRACE_EVENT(kvm_enter,
TP_PROTO(struct kvm_vcpu *vcpu),
TP_ARGS(vcpu),
TP_STRUCT__entry(
__field(unsigned long, pc)
),
TP_fast_assign(
__entry->pc = vcpu->arch.pc;
),
TP_printk("PC: 0x%08lx",
__entry->pc)
);
TRACE_EVENT(kvm_reenter,
TP_PROTO(struct kvm_vcpu *vcpu),
TP_ARGS(vcpu),
TP_STRUCT__entry(
__field(unsigned long, pc)
),
TP_fast_assign(
__entry->pc = vcpu->arch.pc;
),
TP_printk("PC: 0x%08lx",
__entry->pc)
);
TRACE_EVENT(kvm_out,
TP_PROTO(struct kvm_vcpu *vcpu),
TP_ARGS(vcpu),
TP_STRUCT__entry(
__field(unsigned long, pc)
),
TP_fast_assign(
__entry->pc = vcpu->arch.pc;
),
TP_printk("PC: 0x%08lx",
__entry->pc)
);
/* The first 32 exit reasons correspond to Cause.ExcCode */
#define KVM_TRACE_EXIT_INT 0
#define KVM_TRACE_EXIT_TLBMOD 1