linux-kernel - Re: [PATCH v5 19/23] KVM: arm64: GICv4.1: Allow SGIs to switch between HW and SW interrupts

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Message-ID: <9fb8c267-5483-f260-6e37-5e8734b38928@redhat.com>
Date:   Thu, 19 Mar 2020 21:13:29 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jason Cooper <jason@...edaemon.net>, kvm@...r.kernel.org,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-kernel@...r.kernel.org,
        Robert Richter <rrichter@...vell.com>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        kvmarm@...ts.cs.columbia.edu, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 19/23] KVM: arm64: GICv4.1: Allow SGIs to switch
 between HW and SW interrupts

Hi Marc,

On 3/19/20 8:52 PM, Marc Zyngier wrote:
> The assumption here is that we're coming vgic_v4_configure_vsgis(),
> which starts
> by stopping the whole guest. My guess is that it should be safe enough, but
> maybe you are thinking of something else?
I don't have a specific case in mind. Just preferred asking to make
sure. Usually when touching those fields we take the lock (that's also
the case in vgic_debug_show for instance).

Thanks

Eric