linux-kernel - Re: [RFC PATCH 28/33] irqchip/gic-v3-its: Support VPE doorbell invalidation even when !DirectLPI

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Message-ID: <alpine.DEB.2.20.1702131214430.3619@nanos>
Date:   Mon, 13 Feb 2017 12:15:53 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Marc Zyngier <marc.zyngier@....com>
cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        Eric Auger <eric.auger@...hat.com>
Subject: Re: [RFC PATCH 28/33] irqchip/gic-v3-its: Support VPE doorbell
 invalidation even when !DirectLPI

On Tue, 17 Jan 2017, Marc Zyngier wrote:
> When we don't have the DirectLPI feature, we must work around the
> architecture shortcomings to be able to perform the required
> invalidation.
> 
> For this, we create a fake device whose sole purpose is to
> provide a way to issue a map/inv/unmap sequence (and the corresponding
> sync operations). That's 6 commands and a full serialization point
> to be able to do this.
> 
> You just have hope the hypervisor won't do that too often...
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>