linux-kernel - Re: [RFC PATCH 1/5] KVM: vmx: speed up emulation of invalid guest state

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Message-ID: <20140421021333.GA18207@amt.cnet>
Date:	Sun, 20 Apr 2014 23:13:33 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [RFC PATCH 1/5] KVM: vmx: speed up emulation of invalid guest
 state

On Fri, Apr 18, 2014 at 12:19:28AM -0400, Paolo Bonzini wrote:
> Il 16/04/2014 18:52, Marcelo Tosatti ha scritto:
> >How about handling VM-entry error due to invalid state with
> >
> >vmx->emulation_required = true;
> >continue to main vcpu loop;
> 
> What would reset it to false though?  None of the places that call
> emulation_required() is a hot path right now, and this patch doesn't
> add any.

The same code which resets it to false inside the
handle_invalid_guest_state loop (so you would stop emulating
at the same point as you do with this patch).

Advantage would be that failure to set vmx->emulation_required to
true would not cause VM-entry failure.

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