Subject: [PATCH v4 09/10] ARM/ARM64: KVM: Fix CPU_ON emulation for PSCI v0.2

From: [email-masked] (Christoffer Dall)
Date: Sun, 16 Mar 2014 20:41:21 -0700

On Thu, Feb 06, 2014 at 05:01:41PM +0530, Anup Patel wrote:
> As-per PSCI v0.2, the source CPU provides physical address of
> "entry point" and "context id" for starting a target CPU.
> 
> Current emulation of CPU_ON function does not consider physical
> address of "context id" hence this patch updates kvm_psci_vcpu_on()
> such that it works for both PSCI v0.1 and PSCI v0.2.
> 
> Signed-off-by: Anup Patel <[email-masked]>
> Signed-off-by: Pranavkumar Sawargaonkar <[email-masked]>
> ---
>  arch/arm/kvm/psci.c |   11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
> index 75447a3..675866e 100644
> --- a/arch/arm/kvm/psci.c
> +++ b/arch/arm/kvm/psci.c
> @@ -32,12 +32,14 @@ static void kvm_psci_vcpu_off(struct kvm_vcpu *vcpu)
>  	vcpu->arch.pause = true;
>  }
>  
> -static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
> +static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu,
> +				      int psci_version)

I thought this would be what you have kvm_psci_version() for?

>  {
>  	struct kvm *kvm = source_vcpu->kvm;
>  	struct kvm_vcpu *vcpu = NULL, *tmp;
>  	wait_queue_head_t *wq;
>  	unsigned long cpu_id;
> +	unsigned long context_id;
>  	unsigned long mpidr;
>  	phys_addr_t target_pc;
>  	int i;
> @@ -62,6 +64,7 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
>  		return KVM_PSCI_RET_INVAL;
>  
>  	target_pc = *vcpu_reg(source_vcpu, 2);
> +	context_id = *vcpu_reg(source_vcpu, 3);
>  
>  	kvm_reset_vcpu(vcpu);
>  
> @@ -76,6 +79,8 @@ static unsigned long kvm_psci_vcpu_on(struct kvm_vcpu *source_vcpu)
>  		kvm_vcpu_set_be(vcpu);
>  
>  	*vcpu_pc(vcpu) = target_pc;
> +	if (psci_version != KVM_ARM_PSCI_0_1)
> +		*vcpu_reg(vcpu, 0) = context_id;
>  	vcpu->arch.pause = false;
>  	smp_mb();		/* Make sure the above is visible */
>  
> @@ -180,7 +185,7 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
>  		break;
>  	case KVM_PSCI_0_2_FN_CPU_ON:
>  	case KVM_PSCI_0_2_FN64_CPU_ON:
> -		val = kvm_psci_vcpu_on(vcpu);
> +		val = kvm_psci_vcpu_on(vcpu, KVM_ARM_PSCI_0_2);
>  		break;
>  	case KVM_PSCI_0_2_FN_AFFINITY_INFO:
>  	case KVM_PSCI_0_2_FN64_AFFINITY_INFO:
> @@ -234,7 +239,7 @@ static int kvm_psci_0_1_call(struct kvm_vcpu *vcpu)
>  		val = KVM_PSCI_RET_SUCCESS;
>  		break;
>  	case KVM_PSCI_FN_CPU_ON:
> -		val = kvm_psci_vcpu_on(vcpu);
> +		val = kvm_psci_vcpu_on(vcpu, KVM_ARM_PSCI_0_1);
>  		break;
>  	case KVM_PSCI_FN_CPU_SUSPEND:
>  	case KVM_PSCI_FN_MIGRATE:
> -- 
> 1.7.9.5
> 

otherwise:
Reviewed-by: Christoffer Dall <[email-masked]>