From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-79.mta1.migadu.com (out-79.mta1.migadu.com [95.215.58.79]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC67817FEA for ; Wed, 2 Aug 2023 23:43:37 +0000 (UTC) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1691019816; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qqT0zCIJsEeSPR80PQTsas7oUgXS+gw93IfHYu9wlXc=; b=GWwYipisLUNDHZ2+LIg0+myKZsLRdyss9c2xt5cQQ2cOj4l5eglpPA12W2WZuAXL25Yb98 f6jx8M/s4t0QYcYet6R1bNRK8j5EzRI4sQ5cnHUZGyGTiDELfxTwteO8kdtS3XiErDmf5U tQxaA6C53ZA7ttZm4pnlAmu1F4V+Dr4= From: Oliver Upton To: kvmarm@lists.linux.dev Cc: kvm@vger.kernel.org, Marc Zyngier , James Morse , Suzuki K Poulose , Zenghui Yu , Will Deacon , Julien Thierry , Salil Mehta , Oliver Upton Subject: [PATCH kvmtool v3 12/17] aarch64: psci: Implement CPU_OFF Date: Wed, 2 Aug 2023 23:42:50 +0000 Message-ID: <20230802234255.466782-13-oliver.upton@linux.dev> In-Reply-To: <20230802234255.466782-1-oliver.upton@linux.dev> References: <20230802234255.466782-1-oliver.upton@linux.dev> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Add support for PSCI CPU_OFF, relying on KVM emulation of a 'powered off' vCPU by setting the MP state to KVM_MP_STATE_STOPPED. Signed-off-by: Oliver Upton --- arm/aarch64/psci.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arm/aarch64/psci.c b/arm/aarch64/psci.c index abfdc764b7e0..72429b36a835 100644 --- a/arm/aarch64/psci.c +++ b/arm/aarch64/psci.c @@ -17,6 +17,7 @@ static void psci_features(struct kvm_cpu *vcpu, struct arm_smccc_res *res) switch (arg) { case PSCI_0_2_FN_CPU_SUSPEND: case PSCI_0_2_FN64_CPU_SUSPEND: + case PSCI_0_2_FN_CPU_OFF: case ARM_SMCCC_VERSION_FUNC_ID: res->a0 = PSCI_RET_SUCCESS; break; @@ -36,6 +37,16 @@ static void cpu_suspend(struct kvm_cpu *vcpu, struct arm_smccc_res *res) res->a0 = PSCI_RET_SUCCESS; } +static void cpu_off(struct kvm_cpu *vcpu, struct arm_smccc_res *res) +{ + struct kvm_mp_state mp_state = { + .mp_state = KVM_MP_STATE_STOPPED, + }; + + if (ioctl(vcpu->vcpu_fd, KVM_SET_MP_STATE, &mp_state)) + die_perror("KVM_SET_MP_STATE failed"); +} + void handle_psci(struct kvm_cpu *vcpu, struct arm_smccc_res *res) { switch (vcpu->kvm_run->hypercall.nr) { @@ -49,6 +60,9 @@ void handle_psci(struct kvm_cpu *vcpu, struct arm_smccc_res *res) case PSCI_0_2_FN64_CPU_SUSPEND: cpu_suspend(vcpu, res); break; + case PSCI_0_2_FN_CPU_OFF: + cpu_off(vcpu, res); + break; default: res->a0 = PSCI_RET_NOT_SUPPORTED; } -- 2.41.0.585.gd2178a4bd4-goog