linux-kernel - Re: [PATCH V13 10/10] arm/arm64: KVM: add guest SEA support

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Date:   Tue, 28 Mar 2017 17:53:38 +0800
From:   gengdongjiu <gengdongjiu@...wei.com>
To:     Tyler Baicar <tbaicar@...eaurora.org>,
        <christoffer.dall@...aro.org>, <marc.zyngier@....com>,
        <pbonzini@...hat.com>, <rkrcmar@...hat.com>,
        <linux@...linux.org.uk>, <catalin.marinas@....com>,
        <will.deacon@....com>, <rjw@...ysocki.net>, <lenb@...nel.org>,
        <matt@...eblueprint.co.uk>, <robert.moore@...el.com>,
        <lv.zheng@...el.com>, <nkaje@...eaurora.org>,
        <zjzhang@...eaurora.org>, <mark.rutland@....com>,
        <james.morse@....com>, <akpm@...ux-foundation.org>,
        <eun.taik.lee@...sung.com>, <sandeepa.s.prabhu@...il.com>,
        <labbott@...hat.com>, <shijie.huang@....com>,
        <rruigrok@...eaurora.org>, <paul.gortmaker@...driver.com>,
        <tn@...ihalf.com>, <fu.wei@...aro.org>, <rostedt@...dmis.org>,
        <bristot@...hat.com>, <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-efi@...r.kernel.org>, <devel@...ica.org>,
        <Suzuki.Poulose@....com>, <punit.agrawal@....com>,
        <astone@...hat.com>, <harba@...eaurora.org>,
        <hanjun.guo@...aro.org>, <john.garry@...wei.com>,
        <shiju.jose@...wei.com>, <joe@...ches.com>,
        <wuquanming@...wei.com>, <huangshaoyu@...wei.com>
Subject: Re: [PATCH V13 10/10] arm/arm64: KVM: add guest SEA support

Hi,

On 2017/3/22 6:47, Tyler Baicar wrote:
> +	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> +
> +	/* The host kernel will handle the synchronous external abort. There
> +	 * is no need to pass the error into the guest.
> +	 */
> +	if (is_abort_synchronous(fault_status))
> +		sea_status = handle_guest_sea((unsigned long)fault_ipa,
> +				    kvm_vcpu_get_hsr(vcpu));
>  
>  	is_iabt = kvm_vcpu_trap_is_iabt(vcpu);
> -	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu))) {
> +	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu)) && sea_status) {
>  		kvm_inject_vabt(vcpu);
>  		return 1;
>  	}
       After the host kernel correctly handle the synchronous external abort, the sea_status
       will return 0, so the code logical will be continue go-no, whether it is better directly return
       after correctly handle the SEA? such as below.

	if (unlikely(!is_iabt && kvm_vcpu_dabt_isextabt(vcpu)) && sea_status) {
  		kvm_inject_vabt(vcpu);
  		return 1;
  	} else
                return 1;

>  
> -	fault_ipa = kvm_vcpu_get_fault_ipa(vcpu);
> -
>  	trace_kvm_guest_fault(*vcpu_pc(vcpu), kvm_vcpu_get_hsr(vcpu),
>  			      kvm_vcpu_get_hfar(vcpu), fault_ipa);
>  
> -	/* Check the stage-2 fault is trans. fault or write fault */
> -	fault_status = kvm_vcpu_trap_get_fault_type(vcpu);
>  	if (fault_status != FSC_FAULT && fault_status != FSC_PERM &&