From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Maxim Levitsky <mlevitsk@redhat.com>,
"Maciej S . Szmigiero" <maciej.szmigiero@oracle.com>
Subject: [PATCH v2 07/11] KVM: x86: Trace re-injected exceptions
Date: Sat, 23 Apr 2022 02:14:07 +0000 [thread overview]
Message-ID: <20220423021411.784383-8-seanjc@google.com> (raw)
In-Reply-To: <20220423021411.784383-1-seanjc@google.com>
Trace exceptions that are re-injected, not just those that KVM is
injecting for the first time. Debugging re-injection bugs is painful
enough as is, not having visibility into what KVM is doing only makes
things worse.
Delay propagating pending=>injected in the non-reinjection path so that
the tracing can properly identify reinjected exceptions.
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/trace.h | 12 ++++++++----
arch/x86/kvm/x86.c | 16 +++++++++-------
2 files changed, 17 insertions(+), 11 deletions(-)
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index de4762517569..d07428e660e3 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -358,25 +358,29 @@ TRACE_EVENT(kvm_inj_virq,
* Tracepoint for kvm interrupt injection:
*/
TRACE_EVENT(kvm_inj_exception,
- TP_PROTO(unsigned exception, bool has_error, unsigned error_code),
- TP_ARGS(exception, has_error, error_code),
+ TP_PROTO(unsigned exception, bool has_error, unsigned error_code,
+ bool reinjected),
+ TP_ARGS(exception, has_error, error_code, reinjected),
TP_STRUCT__entry(
__field( u8, exception )
__field( u8, has_error )
__field( u32, error_code )
+ __field( bool, reinjected )
),
TP_fast_assign(
__entry->exception = exception;
__entry->has_error = has_error;
__entry->error_code = error_code;
+ __entry->reinjected = reinjected;
),
- TP_printk("%s (0x%x)",
+ TP_printk("%s (0x%x)%s",
__print_symbolic(__entry->exception, kvm_trace_sym_exc),
/* FIXME: don't print error_code if not present */
- __entry->has_error ? __entry->error_code : 0)
+ __entry->has_error ? __entry->error_code : 0,
+ __entry->reinjected ? " [reinjected]" : "")
);
/*
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 951d0a78ccda..c3ee8dc00d3a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9393,6 +9393,11 @@ int kvm_check_nested_events(struct kvm_vcpu *vcpu)
static void kvm_inject_exception(struct kvm_vcpu *vcpu)
{
+ trace_kvm_inj_exception(vcpu->arch.exception.nr,
+ vcpu->arch.exception.has_error_code,
+ vcpu->arch.exception.error_code,
+ vcpu->arch.exception.injected);
+
if (vcpu->arch.exception.error_code && !is_protmode(vcpu))
vcpu->arch.exception.error_code = false;
static_call(kvm_x86_queue_exception)(vcpu);
@@ -9450,13 +9455,6 @@ static int inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit)
/* try to inject new event if pending */
if (vcpu->arch.exception.pending) {
- trace_kvm_inj_exception(vcpu->arch.exception.nr,
- vcpu->arch.exception.has_error_code,
- vcpu->arch.exception.error_code);
-
- vcpu->arch.exception.pending = false;
- vcpu->arch.exception.injected = true;
-
if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT)
__kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) |
X86_EFLAGS_RF);
@@ -9470,6 +9468,10 @@ static int inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit)
}
kvm_inject_exception(vcpu);
+
+ vcpu->arch.exception.pending = false;
+ vcpu->arch.exception.injected = true;
+
can_inject = false;
}
--
2.36.0.rc2.479.g8af0fa9b8e-goog
next prev parent reply other threads:[~2022-04-23 2:15 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-23 2:14 [PATCH v2 00/11] KVM: SVM: Fix soft int/ex re-injection Sean Christopherson
2022-04-23 2:14 ` [PATCH v2 01/11] KVM: nSVM: Sync next_rip field from vmcb12 to vmcb02 Sean Christopherson
2022-04-28 9:33 ` Maxim Levitsky
2022-04-23 2:14 ` [PATCH v2 02/11] KVM: SVM: Don't BUG if userspace injects a soft interrupt with GIF=0 Sean Christopherson
2022-04-28 7:35 ` Maxim Levitsky
2022-04-28 13:27 ` Maciej S. Szmigiero
2022-04-28 14:34 ` Maxim Levitsky
2022-04-28 15:04 ` Sean Christopherson
2022-04-28 16:33 ` Maciej S. Szmigiero
2022-04-23 2:14 ` [PATCH v2 03/11] KVM: SVM: Unwind "speculative" RIP advancement if INTn injection "fails" Sean Christopherson
2022-04-23 2:14 ` [PATCH v2 04/11] KVM: SVM: Stuff next_rip on emulated INT3 injection if NRIPS is supported Sean Christopherson
2022-04-23 2:14 ` [PATCH v2 05/11] KVM: SVM: Re-inject INT3/INTO instead of retrying the instruction Sean Christopherson
2022-04-25 22:59 ` Maciej S. Szmigiero
2022-04-28 9:37 ` Maxim Levitsky
2022-04-28 13:36 ` Maciej S. Szmigiero
2022-04-28 14:25 ` Sean Christopherson
2022-04-23 2:14 ` [PATCH v2 06/11] KVM: SVM: Re-inject INTn instead of retrying the insn on "failure" Sean Christopherson
2022-04-23 2:14 ` Sean Christopherson [this message]
2022-04-28 9:48 ` [PATCH v2 07/11] KVM: x86: Trace re-injected exceptions Maxim Levitsky
2022-04-23 2:14 ` [PATCH v2 08/11] KVM: x86: Print error code in exception injection tracepoint iff valid Sean Christopherson
2022-04-28 9:49 ` Maxim Levitsky
2022-04-23 2:14 ` [PATCH v2 09/11] KVM: x86: Differentiate Soft vs. Hard IRQs vs. reinjected in tracepoint Sean Christopherson
2022-04-25 22:59 ` Maciej S. Szmigiero
2022-04-23 2:14 ` [PATCH v2 10/11] KVM: selftests: nSVM: Add svm_nested_soft_inject_test Sean Christopherson
2022-04-25 23:00 ` Maciej S. Szmigiero
2022-04-23 2:14 ` [PATCH v2 11/11] KVM: SVM: Drop support for CPUs without NRIPS (NextRIP Save) support Sean Christopherson
2022-04-24 9:34 ` Maxim Levitsky
2022-04-25 23:00 ` Maciej S. Szmigiero
2022-04-25 23:01 ` [PATCH v2 00/11] KVM: SVM: Fix soft int/ex re-injection Maciej S. Szmigiero
2022-04-27 18:21 ` Maciej S. Szmigiero
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