linux-kernel - Re: [PATCH 2/4] KVM: x86: separate pending and injected exception

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Date:   Fri, 2 Apr 2021 09:14:54 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Maxim Levitsky <mlevitsk@...hat.com>
Cc:     kvm@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>,
        Jim Mattson <jmattson@...gle.com>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
        Ingo Molnar <mingo@...hat.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>
Subject: Re: [PATCH 2/4] KVM: x86: separate pending and injected exception

On 02/04/21 01:05, Sean Christopherson wrote:
>>
>> +struct kvm_queued_exception {
>> +	bool valid;
>> +	u8 nr;
> 
> If we're refactoring all this code anyways, maybe change "nr" to something a
> bit more descriptive?  E.g. vector.

"nr" is part of the userspace structure, so consistency is an advantage too.

>> +	struct kvm_exception_payload {
>> +		bool valid;
>> +		unsigned long value;
>>   		u8 nested_apf;
>> -	} exception;
>> +	} exception_payload;
> 
> Hmm, even if it's dead code at this time, I think the exception payload should
> be part of 'struct kvm_queued_exception'.  The payload is very much tied to a
> single exception.

Agreed, when handling injected exceptions you can WARN that there is no 
payload.

Paolo