linux-kernel - Re: [PATCH v2 22/29] LoongArch: KVM: Implement handle idle exception

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Message-ID: <5d7fe795-66b9-7a07-b754-77327886c6c6@loongson.cn>
Date:   Tue, 21 Feb 2023 17:48:40 +0800
From:   Tianrui Zhao <zhaotianrui@...ngson.cn>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Mark Brown <broonie@...nel.org>,
        Alex Deucher <alexander.deucher@....com>,
        Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn
Subject: Re: [PATCH v2 22/29] LoongArch: KVM: Implement handle idle exception



在 2023年02月21日 02:40, Paolo Bonzini 写道:
> On 2/20/23 07:57, Tianrui Zhao wrote:
>> +int _kvm_emu_idle(struct kvm_vcpu *vcpu)
>> +{
>> +    ++vcpu->stat.idle_exits;
>> +    trace_kvm_exit(vcpu, KVM_TRACE_EXIT_IDLE);
>
> Please add a separate tracepoint, don't overload trace_kvm_exit().
>
> Likewise for _kvm_trap_handle_gspr().
>
> I think _kvm_trap_handle_gspr() should have a tracepoint whose 
> parameter is inst.word.

Thanks, I will add the tracepoint for _kvm_emu_idle and 
_kvm_trap_handle_gspr.

Thanks
Tianrui Zhao

>
> Paolo
>
>> +    if (!vcpu->arch.irq_pending) {
>> +        kvm_save_timer(vcpu);
>> +        kvm_vcpu_block(vcpu);
>> +    }
>> +
>> +    return EMULATE_DONE;