linux-kernel - Re: [PATCH v3 16/23] kvm: arm64: Forward safe PSCI SMCs coming from host

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Message-ID: <20201202174917.qey4ju2vrzipy4cn@google.com>
Date:   Wed, 2 Dec 2020 17:49:17 +0000
From:   David Brazdil <dbrazdil@...gle.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     kvmarm@...ts.cs.columbia.edu, Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Mark Rutland <mark.rutland@....com>,
        Sudeep Holla <sudeep.holla@....com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kernel-team@...roid.com
Subject: Re: [PATCH v3 16/23] kvm: arm64: Forward safe PSCI SMCs coming from
 host

On Fri, Nov 27, 2020 at 10:14:33AM +0000, Lorenzo Pieralisi wrote:
> On Thu, Nov 26, 2020 at 03:54:14PM +0000, David Brazdil wrote:
> > Forward the following PSCI SMCs issued by host to EL3 as they do not
> > require the hypervisor's intervention. This assumes that EL3 correctly
> > implements the PSCI specification.
> > 
> > Only function IDs implemented in Linux are included.
> > 
> > Where both 32-bit and 64-bit variants exist, it is assumed that the host
> > will always use the 64-bit variant.
> > 
> >  * SMCs that only return information about the system
> >    * PSCI_VERSION        - PSCI version implemented by EL3
> >    * PSCI_FEATURES       - optional features supported by EL3
> >    * AFFINITY_INFO       - power state of core/cluster
> >    * MIGRATE_INFO_TYPE   - whether Trusted OS can be migrated
> >    * MIGRATE_INFO_UP_CPU - resident core of Trusted OS
> >  * operations which do not affect the hypervisor
> >    * MIGRATE             - migrate Trusted OS to a different core
> >    * SET_SUSPEND_MODE    - toggle OS-initiated mode
> >  * system shutdown/reset
> >    * SYSTEM_OFF
> >    * SYSTEM_RESET
> >    * SYSTEM_RESET2
> 
> What about SYSTEM_SUSPEND ?
Oops, forgot that one. Will add a handler similar to CPU_SUSPEND.