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Subject: Re: [PATCH v4 04/20] irqchip/gic-v4.1: Map the ITS SGIR register page
To:     Marc Zyngier <maz@kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <kvmarm@lists.cs.columbia.edu>, <kvm@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
CC:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Jason Cooper <jason@lakedaemon.net>,
        Robert Richter <rrichter@marvell.com>,
        "Thomas Gleixner" <tglx@linutronix.de>,
        Eric Auger <eric.auger@redhat.com>,
        "James Morse" <james.morse@arm.com>,
        Julien Thierry <julien.thierry.kdev@gmail.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>
References: <20200214145736.18550-1-maz@kernel.org>
 <20200214145736.18550-5-maz@kernel.org>
From:   Zenghui Yu <yuzenghui@huawei.com>
Message-ID: <154bd918-de16-e810-d10d-e7642e340415@huawei.com>
Date:   Thu, 20 Feb 2020 11:17:47 +0800
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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@kernel.org>

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