From nobody Wed Dec 17 15:59:44 2025 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 71D572FF66F; Tue, 30 Sep 2025 10:32:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759228338; cv=none; b=ti7Ql5OWsGXn1+QBmJCXDiDwE563ceqSHSjDQEwKRWmr3XUV8CFdVPaMjAbTbSWTNlRCD6k2us2Jrb3j+1xdAl2zppDitf1FUYlkjnCVfGxlXl6kSIoMywG5KfzLyz2a2dYkwPtvG3v/8bCXhR5+g+aETjM3/IWAXHpPIMU8kDY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759228338; c=relaxed/simple; bh=oFezU3XGjLcTfoUCYITrerDtbr6dbbwBkizSu3A7CoM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Rsjs8TMoT0P29fZlJKjcWcOHiSskz5D6NwkzyWi5fs9TZiu+IijPU/Ym57YbWeH7LUu5tbFQk+dF2DcoGQZbfJ7Shka3lk4DfdmmuHQA6VTuu70P5gW9fytfb3LgwjWig9vyipEmpoy0DzLNj2KRswY4pY+OrZT3w3NHXA8z+cQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 101E0202C; Tue, 30 Sep 2025 03:32:09 -0700 (PDT) Received: from ewhatever.cambridge.arm.com (ewhatever.cambridge.arm.com [10.1.197.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id AEC283F66E; Tue, 30 Sep 2025 03:32:15 -0700 (PDT) From: Suzuki K Poulose To: kvmarm@lists.linux.dev Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, alexandru.elisei@arm.com, aneesh.kumar@kernel.org, steven.price@arm.com, tabba@google.com, Suzuki K Poulose Subject: [PATCH kvmtool v4 10/15] arm64: psci: Implement CPU_SUSPEND Date: Tue, 30 Sep 2025 11:31:25 +0100 Message-ID: <20250930103130.197534-12-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250930103130.197534-1-suzuki.poulose@arm.com> References: <20250930103130.197534-1-suzuki.poulose@arm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Oliver Upton 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 Signed-off-by: Suzuki K Poulose --- 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); } =20 +static void handle_wakeup(struct kvm_cpu *vcpu) +{ + struct kvm_mp_state mp_state =3D { + .mp_state =3D 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: { --=20 2.43.0