In order to make debugging easier, expose a new trace point
that triggers when a MMIO check fails.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/kvm/mmu.c | 4 +++-
arch/arm64/kvm/trace_arm.h | 17 +++++++++++++++++
2 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 638827c8842b..c2a23457552b 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1229,8 +1229,10 @@ bool kvm_check_ioguard_page(struct kvm_vcpu *vcpu, gpa_t ipa)
ret = __check_ioguard_page(vcpu, ipa & PAGE_MASK);
spin_unlock(&vcpu->kvm->mmu_lock);
- if (!ret)
+ if (!ret) {
+ trace_kvm_failed_mmio_check(*vcpu_pc(vcpu), ipa);
kvm_inject_dabt(vcpu, kvm_vcpu_get_hfar(vcpu));
+ }
return ret;
}
diff --git a/arch/arm64/kvm/trace_arm.h b/arch/arm64/kvm/trace_arm.h
index 33e4e7dd2719..e40cfeb251ad 100644
--- a/arch/arm64/kvm/trace_arm.h
+++ b/arch/arm64/kvm/trace_arm.h
@@ -89,6 +89,23 @@ TRACE_EVENT(kvm_access_fault,
TP_printk("IPA: %lx", __entry->ipa)
);
+TRACE_EVENT(kvm_failed_mmio_check,
+ TP_PROTO(unsigned long vcpu_pc, unsigned long ipa),
+ TP_ARGS(vcpu_pc, ipa),
+
+ TP_STRUCT__entry(
+ __field( unsigned long, vcpu_pc )
+ __field( unsigned long, ipa )
+ ),
+
+ TP_fast_assign(
+ __entry->vcpu_pc = vcpu_pc;
+ __entry->ipa = ipa;
+ ),
+
+ TP_printk("PC: %lx IPA: %lx", __entry->vcpu_pc, __entry->ipa)
+);
+
TRACE_EVENT(kvm_irq_line,
TP_PROTO(unsigned int type, int vcpu_idx, int irq_num, int level),
TP_ARGS(type, vcpu_idx, irq_num, level),
--
2.30.2
