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Subject: Re: [RFC PATCH v2 08/69] KVM: TDX: add trace point before/after TDX
 SEAMCALLs
To:     isaku.yamahata@intel.com, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H . Peter Anvin" <hpa@zytor.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>, erdemaktas@google.com,
        Connor Kuehl <ckuehl@redhat.com>,
        Sean Christopherson <seanjc@google.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     isaku.yamahata@gmail.com
References: <cover.1625186503.git.isaku.yamahata@intel.com>
 <28a0ae6b767260fcb410c6ddff7de84f4e13062c.1625186503.git.isaku.yamahata@intel.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <03a48573-85b2-f908-f058-205e9aa02787@redhat.com>
Date:   Tue, 6 Jul 2021 15:23:55 +0200
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On 03/07/21 00:04, isaku.yamahata@intel.com wrote:
> +	trace_kvm_tdx_seamcall_enter(smp_processor_id(), op,
> +				     rcx, rdx, r8, r9, r10);
> +	err = __seamcall(op, rcx, rdx, r8, r9, r10, ex);
> +	if (ex)
> +		trace_kvm_tdx_seamcall_exit(smp_processor_id(), op, err, ex->rcx,
> +					    ex->rdx, ex->r8, ex->r9, ex->r10,
> +					    ex->r11);
> +	else
> +		trace_kvm_tdx_seamcall_exit(smp_processor_id(), op, err,
> +					    0, 0, 0, 0, 0, 0);

Would it make sense to do the zeroing of ex directly in __seamcall in 
case there is an error?

Otherwise looks good.

Paolo