On Mon, Jun 24, 2019 at 03:58:11PM +1000, Suraj Jitindar Singh wrote: > The hcall H_PURR is used by a guest to read the PURR (processor > utilisation of resources register). A guest expects that this register > will count at a rate of timebase scaled by the number of guest vcpus > present in the vcore. That is the per vcpu purr will count at a rate of > timebase / # vcpus per vcore. > > Implement a handler for the H_PURR hcall and return the purr value > divided by smp_threads so that the sum of the purr deltas across the > vcpus of a vcore equals the timebase delta > > Signed-off-by: Suraj Jitindar Singh <sjitindarsi...@gmail.com>
Does this need something new advertised in the hypertas DT entry?
> ---
> hw/ppc/spapr_hcall.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index aae9fd2b3e..88b3343f04 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1819,6 +1819,27 @@ static target_ulong h_update_dt(PowerPCCPU *cpu,
> SpaprMachineState *spapr,
> return H_SUCCESS;
> }
>
> +static target_ulong h_purr(PowerPCCPU *cpu, SpaprMachineState *spapr,
> + target_ulong opcode, target_ulong *args)
> +{
> + CPUPPCState *env = &cpu->env;
> + target_ulong purr;
> +
> + if (kvm_enabled()) {
> + cpu_synchronize_state(CPU(cpu));
> + /*
> + * Divide by smp_threads so that the sum of the purr deltas across
> the
> + * vcpus of a vcore equal the timebase delta.
> + */
> + purr = env->spr[SPR_PURR] / smp_threads;
> + } else {
> + purr = cpu_ppc_load_purr(env);
> + }
> + args[0] = purr;
> +
> + return H_SUCCESS;
> +}
> +
> static spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
> static spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX -
> KVMPPC_HCALL_BASE + 1];
>
> @@ -1915,6 +1936,9 @@ static void hypercall_register_types(void)
> spapr_register_hypercall(H_LOGICAL_DCBF, h_logical_dcbf);
> spapr_register_hypercall(KVMPPC_H_LOGICAL_MEMOP, h_logical_memop);
>
> + /* hcall-purr */
> + spapr_register_hypercall(H_PURR, h_purr);
> +
> /* qemu/KVM-PPC specific hcalls */
> spapr_register_hypercall(KVMPPC_H_RTAS, h_rtas);
>
--
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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