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arm/arm64: KVM: Correct KVM_ARM_VCPU_INIT power off option

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The implementation of KVM_ARM_VCPU_INIT is currently not doing what
userspace expects, namely making sure that a vcpu which may have been
turned off using PSCI is returned to its initial state, which would be
powered on if userspace does not set the KVM_ARM_VCPU_POWER_OFF flag.

Implement the expected functionality and clarify the ABI.

Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Christoffer Dall 2014-10-16 16:14:43 +02:00
parent 03f1d4c17e
commit 3ad8b3de52
2 changed files with 4 additions and 1 deletions
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3
Documentation/virtual/kvm/api.txt
View File

@ -2455,7 +2455,8 @@ should be created before this ioctl is invoked.
Possible features:
- KVM_ARM_VCPU_POWER_OFF: Starts the CPU in a power-off state.
Depends on KVM_CAP_ARM_PSCI.
Depends on KVM_CAP_ARM_PSCI. If not set, the CPU will be powered on
and execute guest code when KVM_RUN is called.
- KVM_ARM_VCPU_EL1_32BIT: Starts the CPU in a 32bit mode.
Depends on KVM_CAP_ARM_EL1_32BIT (arm64 only).
- KVM_ARM_VCPU_PSCI_0_2: Emulate PSCI v0.2 for the CPU.

2
arch/arm/kvm/arm.c
View File

@ -663,6 +663,8 @@ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
*/
if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
vcpu->arch.pause = true;
else
vcpu->arch.pause = false;
return 0;
}