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Message-ID: <222a439df0a08d48021e80b9cff7aeb373c9b060.camel@infradead.org>
Date: Tue, 24 Sep 2024 17:13:00 +0100
From: David Woodhouse <dwmw2@...radead.org>
To: Paolo Bonzini <pbonzini@...hat.com>, Jonathan Corbet <corbet@....net>,
Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, James
Morse <james.morse@....com>, Suzuki K Poulose <suzuki.poulose@....com>,
Zenghui Yu <yuzenghui@...wei.com>, Catalin Marinas
<catalin.marinas@....com>, Will Deacon <will@...nel.org>, Mark Rutland
<mark.rutland@....com>, Lorenzo Pieralisi <lpieralisi@...nel.org>, "Rafael
J. Wysocki" <rafael@...nel.org>, Pavel Machek <pavel@....cz>, Len Brown
<len.brown@...el.com>, Shuah Khan <shuah@...nel.org>, kvm@...r.kernel.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
linux-pm@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v4 0/6] Add PSCI v1.3 SYSTEM_OFF2 support for hibernation
(oops, missed --compose on that command line. You can have the cover
letter as a reply instead)
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).
This updates KVM to support advertising PSCI v1.3, and unconditionally
enables the SYSTEM_OFF2 support when PSCI v1.3 is enabled.
For the guest side, add a new SYS_OFF_MODE_POWER_OFF handler with higher
priority than the EFI one, but which *only* triggers when there's a
hibernation in progress. There are other ways to do this (see the commit
message for more details) but this seemed like the simplest.
Version 2 of the patch series splits out the psci.h definitions into a
separate commit (a dependency for both the guest and KVM side), and adds
definitions for the other new functions added in v1.3. It also moves the
pKVM psci-relay support to a separate commit; although in arch/arm64/kvm
that's actually about the *guest* side of SYSTEM_OFF2 (i.e. using it
from the host kernel, relayed through nVHE).
Version 3 dropped the KVM_CAP which allowed userspace to explicitly opt
in to the new feature like with SYSTEM_SUSPEND, and makes it depend only
on PSCI v1.3 being exposed to the guest.
Version 4 is no longer RFC, as the PSCI v1.3 spec is finally published.
Minor fixes from the last round of review, and an added KVM self test.
David Woodhouse (6):
firmware/psci: Add definitions for PSCI v1.3 specification
KVM: arm64: Add PSCI v1.3 SYSTEM_OFF2 function for hibernation
KVM: arm64: Add support for PSCI v1.2 and v1.3
KVM: selftests: Add test for PSCI SYSTEM_OFF2
KVM: arm64: nvhe: Pass through PSCI v1.3 SYSTEM_OFF2 call
arm64: Use SYSTEM_OFF2 PSCI call to power off for hibernate
Documentation/virt/kvm/api.rst | 11 +++++
arch/arm64/include/uapi/asm/kvm.h | 6 +++
arch/arm64/kvm/hyp/nvhe/psci-relay.c | 2 +
arch/arm64/kvm/hypercalls.c | 2 +
arch/arm64/kvm/psci.c | 43 ++++++++++++++++-
drivers/firmware/psci/psci.c | 37 +++++++++++++++
include/kvm/arm_psci.h | 4 +-
include/uapi/linux/psci.h | 20 ++++++++
kernel/power/hibernate.c | 5 +-
tools/testing/selftests/kvm/aarch64/psci_test.c | 61 +++++++++++++++++++++++++
10 files changed, 188 insertions(+), 3 deletions(-)
Download attachment "smime.p7s" of type "application/pkcs7-signature" (5965 bytes)
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