linux-kernel - Re: [PATCH v4 04/20] irqchip/gic-v4.1: Map the ITS SGIR register page

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Message-ID: <154bd918-de16-e810-d10d-e7642e340415@huawei.com>
Date:   Thu, 20 Feb 2020 11:17:47 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jason Cooper <jason@...edaemon.net>,
        Robert Richter <rrichter@...vell.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Eric Auger <eric.auger@...hat.com>,
        "James Morse" <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v4 04/20] irqchip/gic-v4.1: Map the ITS SGIR register page

On 2020/2/14 22:57, Marc Zyngier wrote:
> One of the new features of GICv4.1 is to allow virtual SGIs to be
> directly signaled to a VPE. For that, the ITS has grown a new
> 64kB page containing only a single register that is used to
> signal a SGI to a given VPE.
> 
> Add a second mapping covering this new 64kB range, and take this
> opportunity to limit the original mapping to 64kB, which is enough
> to cover the span of the ITS registers.

Yes, no need to do ioremap for the translation register.

> 
> Signed-off-by: Marc Zyngier<maz@...nel.org>

Reviewed-by: Zenghui Yu <yuzenghui@...wei.com>