linux-kernel - Re: [RFC PATCH 0/5] KVM: arm64: Pass PSCI to userspace

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Date:   Wed, 21 Jul 2021 19:56:25 +0200
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     maz@...nel.org
Cc:     kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, corbet@....net, james.morse@....com,
        alexandru.elisei@....com, suzuki.poulose@....com,
        catalin.marinas@....com, will@...nel.org,
        lorenzo.pieralisi@....com, salil.mehta@...wei.com,
        shameerali.kolothum.thodi@...wei.com, jonathan.cameron@...wei.com,
        tabba@...gle.com, oupton@...gle.com
Subject: Re: [RFC PATCH 0/5] KVM: arm64: Pass PSCI to userspace

On Tue, Jun 08, 2021 at 05:48:01PM +0200, Jean-Philippe Brucker wrote:
> Allow userspace to request handling PSCI calls from guests. Our goal is
> to enable a vCPU hot-add solution for Arm where the VMM presents
> possible resources to the guest at boot, and controls which vCPUs can be
> brought up by allowing or denying PSCI CPU_ON calls.

Since it looks like vCPU hot-add will be implemented differently, I don't
intend to resend this series at the moment. But some of it could be
useful for other projects and to avoid the helpful review effort going to
waste, I fixed it up and will leave it on branch
https://jpbrucker.net/git/linux/log/?h=kvm/psci-to-userspace
It now only uses KVM_CAP_EXIT_HYPERCALL introduced in v5.14.

Thanks,
Jean