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

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Message-ID: <cc65a15b-b8cc-4119-b5a2-ee487f7aaaef@redhat.com>
Date:   Fri, 24 Nov 2023 17:08:41 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Maxim Levitsky <mlevitsk@...hat.com>, 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>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v3 3/4] KVM: x86: add information about pending requests
 to kvm_exit tracepoint

On 9/28/23 12:36, Maxim Levitsky wrote:
> 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)					     \
>   )
>   
>   /*

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>