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Sender: Paolo Bonzini <paolo.bonzini@gmail.com>
Message-ID: <8bab46e6-f7d3-17a7-40cd-7a5dfabc61c0@redhat.com>
Date:   Fri, 15 Apr 2022 16:07:27 +0200
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Subject: Re: [RFC PATCH v5 070/104] KVM: TDX: complete interrupts after tdexit
Content-Language: en-US
To:     isaku.yamahata@intel.com, kvm@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     isaku.yamahata@gmail.com, Jim Mattson <jmattson@google.com>,
        erdemaktas@google.com, Connor Kuehl <ckuehl@redhat.com>,
        Sean Christopherson <seanjc@google.com>
References: <cover.1646422845.git.isaku.yamahata@intel.com>
 <45507ecee0a0d23229e9e7f8bb74077034a40bcd.1646422845.git.isaku.yamahata@intel.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
In-Reply-To: <45507ecee0a0d23229e9e7f8bb74077034a40bcd.1646422845.git.isaku.yamahata@intel.com>
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On 3/4/22 20:49, isaku.yamahata@intel.com wrote:
> From: Isaku Yamahata <isaku.yamahata@intel.com>
> 
> This corresponds to VMX __vmx_complete_interrupts().  Because TDX
> virtualize vAPIC, KVM only needs to care NMI injection.
> 
> Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
> ---
>   arch/x86/kvm/vmx/tdx.c | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
> index c1366aac7d96..3cb2fbd1c12c 100644
> --- a/arch/x86/kvm/vmx/tdx.c
> +++ b/arch/x86/kvm/vmx/tdx.c
> @@ -550,6 +550,14 @@ void tdx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
>   	vcpu->kvm->vm_bugged = true;
>   }
>   
> +static void tdx_complete_interrupts(struct kvm_vcpu *vcpu)
> +{
> +	/* Avoid costly SEAMCALL if no nmi was injected */
> +	if (vcpu->arch.nmi_injected)
> +		vcpu->arch.nmi_injected = td_management_read8(to_tdx(vcpu),
> +							      TD_VCPU_PEND_NMI);
> +}
> +
>   struct tdx_uret_msr {
>   	u32 msr;
>   	unsigned int slot;
> @@ -618,6 +626,8 @@ fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu)
>   	vcpu->arch.regs_avail &= ~VMX_REGS_LAZY_LOAD_SET;
>   	trace_kvm_exit(vcpu, KVM_ISA_VMX);
>   
> +	tdx_complete_interrupts(vcpu);
> +
>   	if (tdx->exit_reason.error || tdx->exit_reason.non_recoverable)
>   		return EXIT_FASTPATH_NONE;
>   	return EXIT_FASTPATH_NONE;

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>