linux-kernel - [PATCH v3 3/4] KVM: x86: add information about pending requests to kvm

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Message-Id: <20230928103640.78453-4-mlevitsk@redhat.com>
Date:   Thu, 28 Sep 2023 13:36:39 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
        x86@...nel.org, Dave Hansen <dave.hansen@...ux.intel.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH v3 3/4] KVM: x86: add information about pending requests to kvm_exit tracepoint

This allows to gather information on how often kvm interrupts vCPUs due
to specific requests.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/trace.h | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 28e8a63368cc02..e275a02a21e523 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -316,12 +316,14 @@ TRACE_EVENT(name,							     \
 		__field(	u32,	        intr_info	)	     \
 		__field(	u32,	        error_code	)	     \
 		__field(	unsigned int,	vcpu_id         )	     \
+		__field(	u64,		requests        )	     \
 	),								     \
 									     \
 	TP_fast_assign(							     \
 		__entry->guest_rip	= kvm_rip_read(vcpu);		     \
 		__entry->isa            = isa;				     \
 		__entry->vcpu_id        = vcpu->vcpu_id;		     \
+		__entry->requests       = READ_ONCE(vcpu->requests);	     \
 		static_call(kvm_x86_get_exit_info)(vcpu,		     \
 					  &__entry->exit_reason,	     \
 					  &__entry->info1,		     \
@@ -331,11 +333,13 @@ 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",					     \
 		  __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)					     \
 )
 
 /*
-- 
2.26.3