[PATCH] KVM: PPC: e500mc: Add support for single threaded vcpus on e6500 core

[Scott Wood]

On Wed, 2014-08-06 at 19:33 +0300, Mihai Caraman wrote:
> @@ -390,19 +400,30 @@ static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
>  
>  static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
>  {
> -	int lpid;
> +	int i, lpid;
>  
> -	lpid = kvmppc_alloc_lpid();
> -	if (lpid < 0)
> -		return lpid;
> +	/* The lpid pool supports only 2 entries now */
> +	if (threads_per_core > 2)
> +		return -ENOMEM;
> +
> +	/* Each VM allocates one LPID per HW thread index */
> +	for (i = 0; i < threads_per_core; i++) {
> +		lpid = kvmppc_alloc_lpid();
> +		if (lpid < 0)
> +			return lpid;
> +
> +		kvm->arch.lpid_pool[i] = lpid;
> +	}

Wouldn't it be simpler to halve the size of the lpid pool that the
allocator sees, and just OR in the high bit based on the low bit of the
cpu number?

-Scott