linux-kernel - Re: [PATCH 5/6] KVM: SVM: pass a proper reason in kvm_emulate

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Date:   Wed, 14 Apr 2021 13:25:15 +0100
From:   David Edmondson <david.edmondson@...cle.com>
To:     Aaron Lewis <aaronlewis@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        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>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Joerg Roedel <joro@...tes.org>,
        Wanpeng Li <wanpengli@...cent.com>,
        Borislav Petkov <bp@...en8.de>,
        Jim Mattson <jmattson@...gle.com>,
        Ingo Molnar <mingo@...hat.com>,
        Joao Martins <joao.m.martins@...cle.com>
Subject: Re: [PATCH 5/6] KVM: SVM: pass a proper reason in
 kvm_emulate_instruction()

On Tuesday, 2021-04-13 at 11:45:52 -07, Aaron Lewis wrote:

>>
>> > Depending on what you're trying to do with the info, maybe there's a better
>> > option.  E.g. Aaron is working on a series that includes passing pass the code
>> > stream (instruction bytes) to userspace on emulation failure, though I'm not
>> > sure if he's planning on providing the VM-Exit reason.
>>
>> Having the instruction stream will be good.
>>
>> Aaron: do you have anything to share now? In what time frame do you
>> think you might submit patches?
>
> I should be able to have something out later this week.  There is no
> exit reason as Sean indicated, so if that's important it will have to
> be reworked afterwards.  For struct internal in kvm_run I use data[0]
> for flags to indicate what's contained in the rest of it, I use
> data[1] as the instruction size, and I use data[2,3] to store the
> instruction bytes.  Hope that helps.

Thanks. I'll hang on to look at the patches before doing anything else.

dme.
-- 
Tell me sweet little lies.