linux-kernel - Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree

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Date:	Wed, 07 Mar 2007 13:02:32 -0800
From:	Dan Hecht <dhecht@...are.com>
To:	tglx@...utronix.de
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	James Morris <jmorris@...ei.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	akpm@...ux-foundation.org, john stultz <johnstul@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: + stupid-hack-to-make-mainline-build.patch added to -mm tree

On 03/07/2007 12:57 PM, Thomas Gleixner wrote:
> On Wed, 2007-03-07 at 12:11 -0800, Jeremy Fitzhardinge wrote:
>> Dan Hecht wrote:
>>> Jeremy, I saw you sent out the Xen version earlier, thanks.  Here's
>>> ours for reference (please excuse any formating issues); it's also
>>> lean. We'll send out a proper patch later after some more testing:
>> So the interrupt side of the clockevent comes through the virtual apic? 
>> Where does evt->handle_event get called?
> 
> 
>>         /* We use normal irq0 handler on cpu0. */
>>         time_init_hook();
> 
> That's exactly the thing I ranted about before. We keep the historic
> view of emulated hardware and just wrap it into enough glue code instead
> of doing an abstract design, which just gets rid of those hardware
> assumptions at all. That's the big advantage of paravirtualization, but
> the current way on paravirt ops is just ignoring this.
> 

Are you saying you would prefer we create our own irq handler something 
like this rather than using the standard i386 handlers?

irqreturn_t vmi_timer_interrupt(int irq, void *dev_id)
{
    local_event->event_handler(local_event);
    return IRQ_HANDLED;
}

??  That's fine with me.
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