linux-kernel - [PATCH kvmtool v4 10/15] arm64: psci: Implement CPU

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Message-ID: <20250930103130.197534-12-suzuki.poulose@arm.com>
Date: Tue, 30 Sep 2025 11:31:25 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: kvmarm@...ts.linux.dev
Cc: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	will@...nel.org,
	oliver.upton@...ux.dev,
	maz@...nel.org,
	alexandru.elisei@....com,
	aneesh.kumar@...nel.org,
	steven.price@....com,
	tabba@...gle.com,
	Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH kvmtool v4 10/15] arm64: psci: Implement CPU_SUSPEND

From: Oliver Upton <oliver.upton@...ux.dev>

Implement support for PSCI CPU_SUSPEND, leveraging in-kernel suspend
emulation (i.e. a WFI state). Eagerly resume the vCPU for any wakeup
event.

Signed-off-by: Oliver Upton <oliver.upton@...ux.dev>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 kvm-cpu.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/kvm-cpu.c b/kvm-cpu.c
index 7362f2e9..d718ef60 100644
--- a/kvm-cpu.c
+++ b/kvm-cpu.c
@@ -143,6 +143,16 @@ void kvm_cpu__run_on_all_cpus(struct kvm *kvm, struct kvm_cpu_task *task)
 	mutex_unlock(&task_lock);
 }
 
+static void handle_wakeup(struct kvm_cpu *vcpu)
+{
+	struct kvm_mp_state mp_state = {
+		.mp_state = KVM_MP_STATE_RUNNABLE,
+	};
+
+	if (ioctl(vcpu->vcpu_fd, KVM_SET_MP_STATE, &mp_state))
+		die_perror("KVM_SET_MP_STATE failed");
+}
+
 int kvm_cpu__start(struct kvm_cpu *cpu)
 {
 	sigset_t sigset;
@@ -236,6 +246,9 @@ int kvm_cpu__start(struct kvm_cpu *cpu)
 				 */
 				kvm__reboot(cpu->kvm);
 				goto exit_kvm;
+			case KVM_SYSTEM_EVENT_WAKEUP:
+				handle_wakeup(cpu);
+				break;
 			};
 			break;
 		default: {
-- 
2.43.0