Re: [Qemu-devel] [PATCH 08/20] target-ppc: Add hooks for handling tcg and kvm limitations

[Avi Kivity]

On 04/15/2012 09:38 PM, Andreas Färber wrote:
> From: David Gibson <address@hidden>
>
> On target-ppc, our table of CPU types and features encodes the features as
> found on the hardware, regardless of whether these features are actually
> usable under TCG or KVM.  We already have cases where the information from
> the cpu table must be fixed up to account for limitations in the emulation
> method we're using.  e.g. TCG does not support the DFP and VSX instructions
> and KVM needs different numbering of the CPUs in order to tell it the
> correct thread to core mappings.
>
> This patch cleans up these hacks to handle emulation limitations by
> consolidating them into a pair of functions specifically for the purpose.
>
>      env->check_pow = def->check_pow;
> +
> +    if (kvm_enabled()) {
> +        if (kvmppc_fixup_cpu(env) != 0) {
> +            fprintf(stderr, "Unable to virtualize selected CPU with KVM\n");
> +            exit(1);
> +        }
> +    } else {
> +        if (ppc_fixup_cpu(env) != 0) {
> +            fprintf(stderr, "Unable to emulate selected CPU with TCG\n");
> +            exit(1);
> +        }
> +    }
> +
>

I wish we had an error like that for x86.  Right now we silently add and
drop cpu features.

-- 
error compiling committee.c: too many arguments to function