[PATCH v2 08/16] KVM: arm64: Add tracepoint for failed MMIO guard check
From: Marc Zyngier <maz@kernel.org>
Date: 2021-10-04 17:49:40
Also in:
kvm, kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
In order to make debugging easier, expose a new trace point that triggers when a MMIO check fails. Signed-off-by: Marc Zyngier <maz@kernel.org> --- 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 2470a55ca675..8c38d856533f 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c@@ -1275,8 +1275,10 @@ 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
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