linux-kernel - Re: [PATCH v6 00/12] KVM: arm64: PSCI SYSTEM

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Date:   Wed,  4 May 2022 13:01:33 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Oliver Upton <oupton@...gle.com>, kvmarm@...ts.cs.columbia.edu
Cc:     linux-arm-kernel@...ts.infradead.org, james.morse@....com,
        kvm@...r.kernel.org, alexandru.elisei@....com, reijiw@...gle.com,
        ricarkol@...gle.com, linux-kernel@...r.kernel.org,
        suzuki.poulose@....com
Subject: Re: [PATCH v6 00/12] KVM: arm64: PSCI SYSTEM_SUSPEND support

On Wed, 4 May 2022 03:24:34 +0000, Oliver Upton wrote:
> The PSCI v1.0 specification describes a call, SYSTEM_SUSPEND, which
> allows software to request that the system be placed into the lowest
> possible power state and await a wakeup event. This call is optional
> in v1.0 and v1.1. KVM does not currently support this optional call.
> 
> This series adds support for the PSCI SYSTEM_SUSPEND call to KVM/arm64.
> For reasons best described in patch 8, it is infeasible to correctly
> implement PSCI SYSTEM_SUSPEND (or any system-wide event for that matter)
> in a split design between kernel/userspace. As such, this series cheaply
> exits to userspace so it can decide what to do with the call. This
> series also gives userspace some help to emulate suspension with a new
> MP state that awaits an unmasked pending interrupt.
> 
> [...]

Applied to next, thanks!

[01/12] KVM: arm64: Don't depend on fallthrough to hide SYSTEM_RESET2
        commit: 5bc2cb95ad03d866422d7b3f19ec42a6720f3262
[02/12] KVM: arm64: Dedupe vCPU power off helpers
        commit: 1e5794295c5dbfcc31cf5de840c9e095ae50efb7
[03/12] KVM: arm64: Track vCPU power state using MP state values
        commit: b171f9bbb130cb323f2101edd32da2a25d43ebfa
[04/12] KVM: arm64: Rename the KVM_REQ_SLEEP handler
        commit: 1c6219e3faf12e58d520b3b2cdfa8cd5e1efc9a5
[05/12] KVM: arm64: Return a value from check_vcpu_requests()
        commit: 3fdd04592d38bb31a0bea567d9a66672b484bed3
[06/12] KVM: arm64: Add support for userspace to suspend a vCPU
        commit: 7b33a09d036ffd9a04506122840629c7e870cf08
[07/12] KVM: arm64: Implement PSCI SYSTEM_SUSPEND
        commit: bfbab44568779e1682bc6f63688bb9c965f0e74a
[08/12] selftests: KVM: Rename psci_cpu_on_test to psci_test
        commit: bf08515d39cb843c81f991ee67ff543eecdba0c3
[09/12] selftests: KVM: Create helper for making SMCCC calls
        commit: e918e2bc52c8ac1cccd6ef822ac23eded41761b6
[10/12] selftests: KVM: Use KVM_SET_MP_STATE to power off vCPU in psci_test
        commit: d135399a97cc3e27716a8e468a5fd1a209346831
[11/12] selftests: KVM: Refactor psci_test to make it amenable to new tests
        commit: 67a36a821312e9c0d2a2f7e6c2225204500cc01c
[12/12] selftests: KVM: Test SYSTEM_SUSPEND PSCI call
        commit: b26dafc8a9e74254a390e8f21ff028a2573ee4fc

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.