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

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Message-ID: <ed4b6d1f4a156e22c5c619e197fa4752@kernel.org>
Date:   Thu, 19 Mar 2020 12:18:38 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Zenghui Yu <yuzenghui@...wei.com>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        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 2020-03-18 03:17, Zenghui Yu wrote:
> 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.

I've added something based on this comment to the commit message.

Thanks!

         M.
-- 
Jazz is not dead. It just smells funny...