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

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Date:   Mon, 20 Feb 2023 19:40:24 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Tianrui Zhao <zhaotianrui@...ngson.cn>
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

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.

Paolo

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