linux-kernel - Re: [PATCH 0/6] KVM: x86: Make the cause of instruction emulation available to user-space

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Message-ID: <cunk0p6sbdq.fsf@dme.org>
Date:   Tue, 13 Apr 2021 11:54:25 +0100
From:   David Edmondson <dme@....org>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joerg Roedel <joro@...tes.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Aaron Lewis <aaronlewis@...gle.com>
Subject: Re: [PATCH 0/6] KVM: x86: Make the cause of instruction emulation
 available to user-space

On Monday, 2021-04-12 at 11:34:33 -07, Jim Mattson wrote:

> On Mon, Apr 12, 2021 at 6:09 AM David Edmondson
> <david.edmondson@...cle.com> wrote:
>>
>> Instruction emulation happens for a variety of reasons, yet on error
>> we have no idea exactly what triggered it. Add a cause of emulation to
>> the various originators and pass it upstream when emulation fails.
>
> What is userspace going to do with this information? It's hard to say
> whether or not this is the right ABI without more context.

Logging for debug purposes, see reply to Sean.

dme.
-- 
You make me feel like a natural woman.