linux-kernel - Re: [PATCH Part2 v6 33/49] KVM: x86: Update page-fault trace to log full 64-bit error code

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Date:   Mon, 25 Jul 2022 13:19:27 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Ashish Kalra <Ashish.Kalra@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, jroedel@...e.de,
        thomas.lendacky@....com, hpa@...or.com, ardb@...nel.org,
        pbonzini@...hat.com, seanjc@...gle.com, vkuznets@...hat.com,
        jmattson@...gle.com, luto@...nel.org, dave.hansen@...ux.intel.com,
        slp@...hat.com, pgonda@...gle.com, peterz@...radead.org,
        srinivas.pandruvada@...ux.intel.com, rientjes@...gle.com,
        dovmurik@...ux.ibm.com, tobin@....com, bp@...en8.de,
        michael.roth@....com, kirill@...temov.name, ak@...ux.intel.com,
        tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, alpergun@...gle.com,
        dgilbert@...hat.com, jarkko@...nel.org
Subject: Re: [PATCH Part2 v6 33/49] KVM: x86: Update page-fault trace to log
 full 64-bit error code

On 6/21/22 01:10, Ashish Kalra wrote:
> From: Brijesh Singh <brijesh.singh@....com>
> 
> The #NPT error code is a 64-bit value but the trace prints only the
> lower 32-bits. Some of the fault error code (e.g PFERR_GUEST_FINAL_MASK)
> are available in the upper 32-bits.
> 
> Cc: <stable@...nel.org>

Why stable?

> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
>  arch/x86/kvm/trace.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
> index e3a24b8f04be..9b9bc5468103 100644
> --- a/arch/x86/kvm/trace.h
> +++ b/arch/x86/kvm/trace.h
> @@ -383,12 +383,12 @@ TRACE_EVENT(kvm_inj_exception,
>   * Tracepoint for page fault.
>   */
>  TRACE_EVENT(kvm_page_fault,
> -	TP_PROTO(unsigned long fault_address, unsigned int error_code),
> +	TP_PROTO(unsigned long fault_address, u64 error_code),
>  	TP_ARGS(fault_address, error_code),
>  
>  	TP_STRUCT__entry(
>  		__field(	unsigned long,	fault_address	)
> -		__field(	unsigned int,	error_code	)
> +		__field(	u64,		error_code	)
>  	),
>  
>  	TP_fast_assign(
> @@ -396,7 +396,7 @@ TRACE_EVENT(kvm_page_fault,
>  		__entry->error_code	= error_code;
>  	),
>  
> -	TP_printk("address %lx error_code %x",
> +	TP_printk("address %lx error_code %llx",
>  		  __entry->fault_address, __entry->error_code)
>  );
>