Re: [PATCH] spapr: prevent hdec timer being set up under virtual hypervisor

[Daniel Henrique Barboza]

On 2/14/22 09:31, Nicholas Piggin wrote:
> The spapr virtual hypervisor does not require the hdecr timer.
> Remove it.
>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>

>   hw/ppc/ppc.c            | 2 +-
>   hw/ppc/spapr_cpu_core.c | 6 +++---
>   2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/hw/ppc/ppc.c b/hw/ppc/ppc.c
> index 462c87dba8..a7c262db93 100644
> --- a/hw/ppc/ppc.c
> +++ b/hw/ppc/ppc.c
> @@ -1072,7 +1072,7 @@ clk_setup_cb cpu_ppc_tb_init (CPUPPCState *env, uint32_t 
> freq)
>       }
>       /* Create new timer */
>       tb_env->decr_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, &cpu_ppc_decr_cb, 
> cpu);
> -    if (env->has_hv_mode) {
> +    if (env->has_hv_mode && !cpu->vhyp) {
>           tb_env->hdecr_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, 
> &cpu_ppc_hdecr_cb,
>                                                   cpu);
>       } else {
> diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
> index a781e97f8d..ed84713960 100644
> --- a/hw/ppc/spapr_cpu_core.c
> +++ b/hw/ppc/spapr_cpu_core.c
> @@ -261,12 +261,12 @@ static bool spapr_realize_vcpu(PowerPCCPU *cpu, 
> SpaprMachineState *spapr,
>           return false;
>       }
>   
> -    /* Set time-base frequency to 512 MHz */
> -    cpu_ppc_tb_init(env, SPAPR_TIMEBASE_FREQ);
> -
>       cpu_ppc_set_vhyp(cpu, PPC_VIRTUAL_HYPERVISOR(spapr));
>       kvmppc_set_papr(cpu);
>   
> +    /* Set time-base frequency to 512 MHz. vhyp must be set first. */
> +    cpu_ppc_tb_init(env, SPAPR_TIMEBASE_FREQ);
> +
>       if (spapr_irq_cpu_intc_create(spapr, cpu, errp) < 0) {
>           qdev_unrealize(DEVICE(cpu));
>           return false;