From: Oliver Upton <oliver.upton@linux.dev>
To: kvmarm@lists.linux.dev
Cc: kvm@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>, Will Deacon <will@kernel.org>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Salil Mehta <salil.mehta@huawei.com>,
Oliver Upton <oliver.upton@linux.dev>
Subject: [PATCH kvmtool v3 12/17] aarch64: psci: Implement CPU_OFF
Date: Wed, 2 Aug 2023 23:42:50 +0000 [thread overview]
Message-ID: <20230802234255.466782-13-oliver.upton@linux.dev> (raw)
In-Reply-To: <20230802234255.466782-1-oliver.upton@linux.dev>
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 <oliver.upton@linux.dev>
---
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
next prev parent reply other threads:[~2023-08-02 23:43 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-02 23:42 [PATCH kvmtool v3 00/17] aarch64: Handle PSCI calls in userspace Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 01/17] Import arm-smccc.h from Linux 6.5-rc1 Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 02/17] aarch64: Copy cputype.h " Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 03/17] Update psci.h to " Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 04/17] arm: Stash kvm_vcpu_init for later use Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 05/17] arm: Use KVM_SET_MP_STATE ioctl to power off non-boot vCPUs Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 06/17] aarch64: Expose ARM64_CORE_REG() for general use Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 07/17] arm: Generalize execution state specific VM initialization Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 08/17] Add helpers to pause the VM from vCPU thread Oliver Upton
2023-09-18 10:40 ` Will Deacon
2023-09-18 17:05 ` Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 09/17] aarch64: Add support for finding vCPU for given MPIDR Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 10/17] aarch64: Add skeleton implementation for PSCI Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 11/17] aarch64: psci: Implement CPU_SUSPEND Oliver Upton
2023-08-02 23:42 ` Oliver Upton [this message]
2023-08-02 23:42 ` [PATCH kvmtool v3 13/17] aarch64: psci: Implement CPU_ON Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 14/17] aarch64: psci: Implement AFFINITY_INFO Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 15/17] aarch64: psci: Implement MIGRATE_INFO_TYPE Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 16/17] aarch64: psci: Implement SYSTEM_{OFF,RESET} Oliver Upton
2023-08-02 23:42 ` [PATCH kvmtool v3 17/17] aarch64: smccc: Start sending PSCI to userspace Oliver Upton
2023-09-13 18:42 ` [PATCH kvmtool v3 00/17] aarch64: Handle PSCI calls in userspace Oliver Upton
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