linux-kernel - Re: (subset) [PATCH v6 0/6] Add PSCI v1.3 SYSTEM

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Message-ID: <74db59658c40fad82d681bd1ebcf893c7ec27322.camel@infradead.org>
Date: Thu, 31 Oct 2024 17:18:57 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: Catalin Marinas <catalin.marinas@....com>, Oliver Upton
	 <oliver.upton@...ux.dev>
Cc: Zenghui Yu <yuzenghui@...wei.com>, James Morse <james.morse@....com>, 
 linux-doc@...r.kernel.org, Marc Zyngier <maz@...nel.org>, Jonathan Corbet
 <corbet@....net>, kvmarm@...ts.linux.dev, Len Brown <len.brown@...el.com>, 
 Mark Rutland <mark.rutland@....com>, linux-kernel@...r.kernel.org, Pavel
 Machek <pavel@....cz>, Shuah Khan <shuah@...nel.org>, kvm@...r.kernel.org,
 Suzuki K Poulose <suzuki.poulose@....com>,  Miguel Luis
 <miguel.luis@...cle.com>, Will Deacon <will@...nel.org>, "Rafael J.
 Wysocki" <rafael@...nel.org>,  Paolo Bonzini <pbonzini@...hat.com>,
 linux-kselftest@...r.kernel.org, Francesco Lavra
 <francescolavra.fl@...il.com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: (subset) [PATCH v6 0/6] Add PSCI v1.3 SYSTEM_OFF2 support for
 hibernation

On Thu, 2024-10-31 at 12:15 +0000, Catalin Marinas wrote:
> On Fri, Oct 25, 2024 at 10:12:41PM +0000, Oliver Upton wrote:
> > On Sat, 19 Oct 2024 18:15:41 +0100, David Woodhouse wrote:
> > > The PSCI v1.3 spec (https://developer.arm.com/documentation/den0022)
> > > adds support for a SYSTEM_OFF2 function enabling a HIBERNATE_OFF state
> > > which is analogous to ACPI S4. This will allow hosting environments to
> > > determine that a guest is hibernated rather than just powered off, and
> > > ensure that they preserve the virtual environment appropriately to
> > > allow the guest to resume safely (or bump the hardware_signature in the
> > > FACS to trigger a clean reboot instead).
> > > 
> > > [...]
> > 
> > I grabbed the KVM portions of this series, as they look ready to go. Happy
> > to take the last one through kvmarm tree w/ acks, and can toss it on top.
> 
> Happy for you to take the last patch as well through the KVM tree. Feel
> free to adjust the code comment as you see fit.

Thanks. that's probably the best option, as it depends on the
definitions in psci.h.



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