linux-kernel - Re: [PATCH v2 0/4] VGIC early initialization initiated by user-space

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Message-ID: <20141204105452.GB4526@cbox>
Date:	Thu, 4 Dec 2014 11:54:52 +0100
From:	Christoffer Dall <christoffer.dall@...aro.org>
To:	Eric Auger <eric.auger@...aro.org>
Cc:	eric.auger@...com, marc.zyngier@....com, andre.przywara@....com,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org, alex.williamson@...hat.com, agraf@...e.de,
	gleb@...nel.org, pbonzini@...hat.com, linux-kernel@...r.kernel.org,
	patches@...aro.org, will.deacon@....com,
	a.motakis@...tualopensystems.com
Subject: Re: [PATCH v2 0/4] VGIC early initialization initiated by user-space

On Thu, Dec 04, 2014 at 10:48:00AM +0100, Eric Auger wrote:
> Since the advent of dynamic initialization of VGIC, this latter is
> initialized very late, on the first vcpu run. This initialization
> could be initiated much earlier by the user-space, as soon as it has
> set the requested dimensioning parameters: number of IRQs, number of
> vCPUs, base addresses.
> 
> One motivation behind being able to initialize the VGIC sooner is
> related to the setup of IRQ injection in VFIO use case. The VFIO
> signaling, especially when used along with irqfd must be set *after*
> vgic initialization to prevent any virtual IRQ injection before
> vgic initialization. If virtual IRQ injection occurs before the VGIC
> init, the IRQ cannot be injected and subsequent injection is blocked
> due to VFIO completion mechanism (unmask/mask or forward/unforward).
> 
The series looks overall pretty good to me.

-Christoffer
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