linux-kernel - RE: [PATCH v8 33/33] KVM: x86/vmx: refactor VMX_DO_EVENT

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Date:   Tue, 11 Apr 2023 05:06:26 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     "Christopherson,, Sean" <seanjc@...gle.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "jiangshanlai@...il.com" <jiangshanlai@...il.com>,
        "Kang, Shan" <shan.kang@...el.com>
Subject: RE: [PATCH v8 33/33] KVM: x86/vmx: refactor VMX_DO_EVENT_IRQOFF to
 generate FRED stack frames

> 
>  	kvm_before_interrupt(vcpu, KVM_HANDLING_IRQ);
> -	vmx_do_interrupt_irqoff(gate_offset(desc));
> +	if (cpu_feature_enabled(X86_FEATURE_FRED))
> +		vmx_do_fred_interrupt_irqoff(vector);
> +	else
> +		vmx_do_interrupt_irqoff(gate_offset((gate_desc *)host_idt_base


external_interrupt() is always available on x86_64, even when CONFIG_X86_FRED
is not defined. I prefer to always call external_interrupt() on x86_64 for IRQ
handling, which avoids re-entering noinstr code. how do you think? Too
aggressive?

Thanks!
  Xin


> +
> +vector));
>  	kvm_after_interrupt(vcpu);