linux-kernel - [PATCH 3/4] KVM: x86: add more information to kvm

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Message-Id: <20230830124243.671152-4-mlevitsk@redhat.com>
Date:   Wed, 30 Aug 2023 15:42:42 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 3/4] KVM: x86: add more information to kvm_exit tracepoint

Add:
  - Flag that shows that the VM is in guest mode
  - Bitmap of pending kvm requests.
  - Flag showing that this VM exit is due to request to have
    an immediate VM exit.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/trace.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index f4c56f59f5c11b..0657a3a348b4ae 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -320,12 +320,18 @@ TRACE_EVENT(name,							     \
 		__field(	u32,	        intr_info	)	     \
 		__field(	u32,	        error_code	)	     \
 		__field(	unsigned int,	vcpu_id         )	     \
+		__field(	bool,		guest_mode      )	     \
+		__field(	u64,		requests        )	     \
+		__field(	bool,		req_imm_exit	)	     \
 	),								     \
 									     \
 	TP_fast_assign(							     \
 		__entry->guest_rip	= kvm_rip_read(vcpu);		     \
 		__entry->isa            = isa;				     \
 		__entry->vcpu_id        = vcpu->vcpu_id;		     \
+		__entry->guest_mode     = is_guest_mode(vcpu);		     \
+		__entry->requests       = READ_ONCE(vcpu->requests);	     \
+		__entry->req_imm_exit   = vcpu->arch.req_immediate_exit;     \
 		static_call(kvm_x86_get_exit_info)(vcpu,		     \
 					  &__entry->exit_reason,	     \
 					  &__entry->info1,		     \
@@ -335,11 +341,15 @@ TRACE_EVENT(name,							     \
 	),								     \
 									     \
 	TP_printk("vcpu %u reason %s%s%s rip 0x%lx info1 0x%016llx "	     \
-		  "info2 0x%016llx intr_info 0x%08x error_code 0x%08x",	     \
+		  "info2 0x%016llx intr_info 0x%08x error_code 0x%08x "      \
+		  "requests 0x%016llx%s%s",				     \
 		  __entry->vcpu_id,					     \
 		  kvm_print_exit_reason(__entry->exit_reason, __entry->isa), \
 		  __entry->guest_rip, __entry->info1, __entry->info2,	     \
-		  __entry->intr_info, __entry->error_code)		     \
+		  __entry->intr_info, __entry->error_code, 		     \
+		  __entry->requests,					     \
+		  __entry->guest_mode ? " [guest]" : "",		     \
+		  __entry->req_imm_exit ? " [imm exit]" : "")		     \
 )
 
 /*
-- 
2.26.3