linux-kernel - Re: [PATCH v5 21/23] KVM: arm64: GICv4.1: Reload VLPI configuration on distributor enable/disable

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Message-ID: <7f112d75-166b-24eb-538d-e100242d8e9a@huawei.com>
Date:   Wed, 18 Mar 2020 11:17:57 +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 v5 21/23] KVM: arm64: GICv4.1: Reload VLPI configuration
 on distributor enable/disable

On 2020/3/5 4:33, Marc Zyngier wrote:
> Each time a Group-enable bit gets flipped, the state of these bits
> needs to be forwarded to the hardware. This is a pretty heavy
> handed operation, requiring all vcpus to reload their GICv4
> configuration. It is thus implemented as a new request type.

[note to myself]
... and the status are forwarded to HW by programming VGrp{0,1}En
fields of GICR_VPENDBASER when vPEs are made resident next time.

> 
> Of course, we only support Group-1 for now...
> 
> Signed-off-by: Marc Zyngier <maz@...nel.org>

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


Thanks