linux-kernel - Re: [PATCH v4 2/7] x86: kvm: svm: propagate errors from skip_emulated

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Date:   Thu, 15 Aug 2019 11:24:25 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH v4 2/7] x86: kvm: svm: propagate errors from skip_emulated_instruction()

Sean Christopherson <sean.j.christopherson@...el.com> writes:

> On Wed, Aug 14, 2019 at 11:34:52AM +0200, Vitaly Kuznetsov wrote:
>> Sean Christopherson <sean.j.christopherson@...el.com> writes:
>>
>> > x86_emulate_instruction() doesn't set vcpu->run->exit_reason when emulation
>> > fails with EMULTYPE_SKIP, i.e. this will exit to userspace with garbage in
>> > the exit_reason.
>> 
>> Oh, nice catch, will take a look!
>
> Don't worry about addressing this.  Paolo has already queued the series,
> and I've got a patch set waiting that purges emulation_result entirely
> that I'll post once your series hits kvm/queue.

Sometimes being slow and lazy pays off :-)

Thanks a lot!

-- 
Vitaly