[PATCH v9 09/12] ARM/ARM64: KVM: Emulate PSCI v0.2 MIGRATE_INFO_TYPE and related functions

[Marc Zyngier]

On Tue, Apr 15 2014 at  7:14:12 am BST, Anup Patel <anup.patel at linaro.org> wrote:
> This patch adds emulation of PSCI v0.2 MIGRATE, MIGRATE_INFO_TYPE, and
> MIGRATE_INFO_UP_CPU function calls for KVM ARM/ARM64.
>
> KVM ARM/ARM64 being a hypervisor (and not a Trusted OS), we cannot provide
> this functions hence we emulate these functions in following way:
> 1. MIGRATE - Returns "Not Supported"
> 2. MIGRATE_INFO_TYPE - Return 2 i.e. Trusted OS is not present
> 3. MIGRATE_INFO_UP_CPU - Returns "Not Supported"
>
> Signed-off-by: Anup Patel <anup.patel at linaro.org>
> Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar at linaro.org>
> Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>

Acked-by: Marc Zyngier <marc.zyngier at arm.com>

> ---
>  arch/arm/kvm/psci.c |   21 ++++++++++++++++-----
>  1 file changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/arch/arm/kvm/psci.c b/arch/arm/kvm/psci.c
> index f6f9290..1af0016 100644
> --- a/arch/arm/kvm/psci.c
> +++ b/arch/arm/kvm/psci.c
> @@ -182,6 +182,22 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
>  	case PSCI_0_2_FN64_AFFINITY_INFO:
>  		val = kvm_psci_vcpu_affinity_info(vcpu);
>  		break;
> +	case PSCI_0_2_FN_MIGRATE:
> +	case PSCI_0_2_FN64_MIGRATE:
> +		val = PSCI_RET_NOT_SUPPORTED;
> +		break;
> +	case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
> +		/*
> +		 * Trusted OS is MP hence does not require migration
> +	         * or
> +		 * Trusted OS is not present
> +		 */
> +		val = PSCI_0_2_TOS_MP;
> +		break;
> +	case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
> +	case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
> +		val = PSCI_RET_NOT_SUPPORTED;
> +		break;
>  	case PSCI_0_2_FN_SYSTEM_OFF:
>  		kvm_psci_system_off(vcpu);
>  		val = PSCI_RET_SUCCESS;
> @@ -193,12 +209,7 @@ static int kvm_psci_0_2_call(struct kvm_vcpu *vcpu)
>  		ret = 0;
>  		break;
>  	case PSCI_0_2_FN_CPU_SUSPEND:
> -	case PSCI_0_2_FN_MIGRATE:
> -	case PSCI_0_2_FN_MIGRATE_INFO_TYPE:
> -	case PSCI_0_2_FN_MIGRATE_INFO_UP_CPU:
>  	case PSCI_0_2_FN64_CPU_SUSPEND:
> -	case PSCI_0_2_FN64_MIGRATE:
> -	case PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU:
>  		val = PSCI_RET_NOT_SUPPORTED;
>  		break;
>  	default:

-- 
Jazz is not dead. It just smells funny.