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 <sam.bobroff@xxxxxxxxxxx>
---
v2:
* Use CPU_FTR_TM_COMP instead of CPU_FTR_TM.
* I didn't unbreak the line, as with the extra characters checkpatch will
complain if I do. I did move the break to a more usual place.
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..5ebc8ff 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_COMP) &&
+ 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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