linux-kernel - Re: [PATCH 1/2] KVM: x86: handle hardware breakpoints during emulation

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Message-ID: <51ADF44E.40100@redhat.com>
Date:	Tue, 04 Jun 2013 16:06:06 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Gleb Natapov <gleb@...hat.com>
CC:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	jan.kiszka@...mens.com
Subject: Re: [PATCH 1/2] KVM: x86: handle hardware breakpoints during emulation

Il 04/06/2013 14:53, Gleb Natapov ha scritto:
>> > 
> Yeah. What about:
>  if ((dr6 = guest_debug()))
>    return handle_gues_debug();
>  else if ((dr6 = check_bp()))
>    return handle_bp(dr6);

I'll try either this...

>>>> > >> If you do not want EMULATE_PROCEED, I can just use -1 instead in
>>>> > >> kvm_vcpu_check_breakpoint, and return if r < 0.
>>>> > >>
>>> > > But you need to know what to return EMULATE_DONE or EMULATE_USER_EXIT.
>> > 
>> > Sorry, _not_ return if r < 0.
>> > 
> Function that returns enum or -1? This is worse IMO. Return
> EMULATE_DONE/EMULATE_USER_EXIT via a pointer will be better.

... or this, and see what looks nicer.  But I like

   if (check_bp(&r))
       return r;

Thanks for the review.

Paolo

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