Re: [PATCH 1/1] KVM: PPC: Introduce KVM_CAP_PPC_HTM

[David Gibson]

On Wed, Jul 06, 2016 at 04:05:54PM +1000, Sam Bobroff wrote:
> Introduce a new KVM capability, KVM_CAP_PPC_HTM, that can be queried to
> determine if a PowerPC KVM guest should use HTM (Hardware Transactional
> Memory).
> 
> This will be used by QEMU to populate the pa-features bits in the
> guest's device tree.
> 
> Signed-off-by: Sam Bobroff 

Reviewed-by: David Gibson 

> ---
> 
>  arch/powerpc/kvm/powerpc.c | 4 
>  include/uapi/linux/kvm.h   | 1 +
>  2 files changed, 5 insertions(+)
> 
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 02416fe..06d79bc 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -588,6 +588,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long 
> ext)
>   r = 1;
>   break;
>  #endif
> + case KVM_CAP_PPC_HTM:
> + r = cpu_has_feature(CPU_FTR_TM)
> + && is_kvmppc_hv_enabled(kvm);
> + break;
>   default:
>   r = 0;
>   break;
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 05ebf47..f421d0e 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -866,6 +866,7 @@ struct kvm_ppc_smmu_info {
>  #define KVM_CAP_ARM_PMU_V3 126
>  #define KVM_CAP_VCPU_ATTRIBUTES 127
>  #define KVM_CAP_MAX_VCPU_ID 128
> +#define KVM_CAP_PPC_HTM 129
>  
>  #ifdef KVM_CAP_IRQ_ROUTING
>  

-- 
David Gibson| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson


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Re: [PATCH 1/1] KVM: PPC: Introduce KVM_CAP_PPC_HTM

[Balbir Singh]

On Wed, 2016-07-06 at 16:05 +1000, Sam Bobroff wrote:
> Introduce a new KVM capability, KVM_CAP_PPC_HTM, that can be queried to
> determine if a PowerPC KVM guest should use HTM (Hardware Transactional
> Memory).
> 
> This will be used by QEMU to populate the pa-features bits in the
> guest's device tree.
> 
> Signed-off-by: Sam Bobroff 
> ---

Makes sense

Acked-by: Balbir Singh 

>  
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[PATCH 1/1] KVM: PPC: Introduce KVM_CAP_PPC_HTM

[Sam Bobroff]

Introduce a new KVM capability, KVM_CAP_PPC_HTM, that can be queried to
determine if a PowerPC KVM guest should use HTM (Hardware Transactional
Memory).

This will be used by QEMU to populate the pa-features bits in the
guest's device tree.

Signed-off-by: Sam Bobroff 
---

 arch/powerpc/kvm/powerpc.c | 4 
 include/uapi/linux/kvm.h   | 1 +
 2 files changed, 5 insertions(+)

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 02416fe..06d79bc 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -588,6 +588,10 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = 1;
break;
 #endif
+   case KVM_CAP_PPC_HTM:
+   r = cpu_has_feature(CPU_FTR_TM)
+   && is_kvmppc_hv_enabled(kvm);
+   break;
default:
r = 0;
break;
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 05ebf47..f421d0e 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -866,6 +866,7 @@ struct kvm_ppc_smmu_info {
 #define KVM_CAP_ARM_PMU_V3 126
 #define KVM_CAP_VCPU_ATTRIBUTES 127
 #define KVM_CAP_MAX_VCPU_ID 128
+#define KVM_CAP_PPC_HTM 129
 
 #ifdef KVM_CAP_IRQ_ROUTING
 
-- 
2.1.0

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