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| author | Christoffer Dall <christoffer.dall@linaro.org> | 2014-10-16 16:14:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-03 19:49:06 -0700 |
| commit | 97110822ab73a02e9174779b5f5c5e63a468c1d3 (patch) | |
| tree | 0e4430c6daa39938accb287e49d4eff25fce3040 | |
| parent | 21ed02b76ae27513ce2143aa5e474d860a358ca8 (diff) | |
| download | lwn-97110822ab73a02e9174779b5f5c5e63a468c1d3.tar.gz lwn-97110822ab73a02e9174779b5f5c5e63a468c1d3.zip | |
arm/arm64: KVM: Correct KVM_ARM_VCPU_INIT power off option
commit 3ad8b3de526a76fbe9466b366059e4958957b88f upstream.
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>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 3 | ||||
| -rw-r--r-- | arch/arm/kvm/arm.c | 2 |
2 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index 6cd63a9010fb..bc6d61773ee2 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2344,7 +2344,8 @@ 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). diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 4a7f5389c881..9c58125ba2d7 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -680,6 +680,8 @@ 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; } |