linux-kernel - Re: [PATCH] KVM: Use IRQF_ONESHOT for assigned device MSI interrupts

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Message-ID: <4FD5C205.5070901@redhat.com>
Date:	Mon, 11 Jun 2012 13:01:41 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Jan Kiszka <jan.kiszka@...mens.com>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alex Williamson <alex.williamson@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"yongjie.ren@...el.com" <yongjie.ren@...el.com>
Subject: Re: [PATCH] KVM: Use IRQF_ONESHOT for assigned device MSI interrupts

On 06/08/2012 05:50 PM, Jan Kiszka wrote:
> 
>> 
>> Pls correct me if I'm wrong.
> 
> Well, IIRC, the "don't loop over all vcpus with IRQs or preemption
> disabled" was one argument against direct legacy interrupt injection as
> well. That's what I kept in mind from those discussions. Maybe Avi can
> comment on the current position.

It's still my position.

IMO we need something like struct gfn_to_hva_cache for interrupts.  If
it's in the cache, we fast-path it from the interrupt handler.  If not,
fall back to a workqueue and let it refill the cache.

-- 
error compiling committee.c: too many arguments to function
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