linux-kernel - Re: [RFC PATCH v1 3/4] KVM: arm64: GICv4.1: Restore VLPI's pending state to physical side

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Message-ID: <2ad38077300bdcaedd2e3b073cd36743@kernel.org>
Date:   Tue, 01 Dec 2020 10:55:20 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Shenming Lu <lushenming@...wei.com>
Cc:     James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Eric Auger <eric.auger@...hat.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoffer Dall <christoffer.dall@....com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Cornelia Huck <cohuck@...hat.com>, Neo Jia <cjia@...dia.com>,
        wanghaibin.wang@...wei.com, yuzenghui@...wei.com
Subject: Re: [RFC PATCH v1 3/4] KVM: arm64: GICv4.1: Restore VLPI's pending
 state to physical side

On 2020-11-30 07:23, Shenming Lu wrote:

Hi Shenming,

> We are pondering over this problem these days, but still don't get a
> good solution...
> Could you give us some advice on this?
> 
> Or could we move the restoring of the pending states (include the sync
> from guest RAM and the transfer to HW) to the GIC VM state change 
> handler,
> which is completely corresponding to save_pending_tables (more 
> symmetric?)
> and don't expose GICv4...

What is "the GIC VM state change handler"? Is that a QEMU thing?
We don't really have that concept in KVM, so I'd appreciate if you could
be a bit more explicit on this.

Thanks,

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