linux-kernel - Re: [PATCH] kvm: optimize ISR lookups

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Message-ID: <20120521222449.GJ17031@redhat.com>
Date:	Tue, 22 May 2012 01:24:49 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	kvm@...r.kernel.org, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kvm: optimize ISR lookups

On Tue, May 22, 2012 at 12:14:18AM +0200, Thomas Gleixner wrote:
> On Tue, 22 May 2012, Michael S. Tsirkin wrote:
> 
> > On Mon, May 21, 2012 at 11:04:25PM +0200, Thomas Gleixner wrote:
> > > > @@ -242,6 +262,25 @@ static inline void apic_clear_irr(int vec, struct kvm_lapic *apic)
> > > >  		apic->irr_pending = true;
> > > >  }
> > > >  
> > > > +static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
> > > > +{
> > > > +	if (!__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
> > > > +		++apic->isr_count;
> > > > +	ASSERT(apic->isr_count > MAX_APIC_VECTOR);
> > > 
> > > I'm really curious what you observed when defining DEBUG in that file.
> > > 
> > > Clearly you never did.
> > 
> > Sorry :(
> > Yes clearly silly, thanks for pointing this out.
> 
> That's all you have a reply for? That's the least of the problems ....

Others are not my fault :)

Seriously, if Avi/Marcelo want to rewrite the ISR emulation
I can help. If they want to keep it 1:1 with hardware
then what I wrote seems the only way.

So waiting for them to respond.

-- 
MST
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