Re: [PATCH 4/4] ppc/pnv: Return zero for core thread state xscom

[Nicholas Piggin]

On Fri Jun 30, 2023 at 1:55 PM AEST, Joel Stanley wrote:
> Firmware now warns if booting in LPAR per core mode (PPC bit 62). So
> this warning doesn't trigger report the core thread state is 0.
>
> Signed-off-by: Joel Stanley <joel@jms.id.au>
> ---
>  hw/ppc/pnv_core.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/hw/ppc/pnv_core.c b/hw/ppc/pnv_core.c
> index 7fff2fd9e298..98356d7f6538 100644
> --- a/hw/ppc/pnv_core.c
> +++ b/hw/ppc/pnv_core.c
> @@ -116,6 +116,8 @@ static const MemoryRegionOps pnv_core_power8_xscom_ops = {
>  #define PNV9_XSCOM_EC_PPM_SPECIAL_WKUP_HYP 0xf010d
>  #define PNV9_XSCOM_EC_PPM_SPECIAL_WKUP_OTR 0xf010a
>  
> +#define PNV9_XSCOM_EC_CORE_THREAD_STATE    0x10ab3
> +
>  static uint64_t pnv_core_power9_xscom_read(void *opaque, hwaddr addr,
>                                             unsigned int width)
>  {
> @@ -134,6 +136,9 @@ static uint64_t pnv_core_power9_xscom_read(void *opaque, 
> hwaddr addr,
>      case PNV9_XSCOM_EC_PPM_SPECIAL_WKUP_OTR:
>          val = 0x0;
>          break;
> +    case PNV9_XSCOM_EC_CORE_THREAD_STATE:
> +        val = 0;
> +        break;
>      default:
>          qemu_log_mask(LOG_UNIMP, "Warning: reading reg=0x%" HWADDR_PRIx "\n",
>                    addr);
> @@ -408,6 +413,8 @@ static const MemoryRegionOps pnv_quad_power9_xscom_ops = {
>   * POWER10 Quads
>   */
>  
> +#define PNV10_XSCOM_EC_PC_PMC_CORE_THREAD_STATE 0x28412
> +
>  static uint64_t pnv_quad_power10_xscom_read(void *opaque, hwaddr addr,
>                                              unsigned int width)
>  {
> @@ -415,6 +422,9 @@ static uint64_t pnv_quad_power10_xscom_read(void *opaque, 
> hwaddr addr,
>      uint64_t val = -1;
>  
>      switch (offset) {
> +    case PNV10_XSCOM_EC_PC_PMC_CORE_THREAD_STATE:
> +        val = 0;
> +        break;
>      default:
>          qemu_log_mask(LOG_UNIMP, "%s: writing @0x%08x\n", __func__,
>                        offset);

Yeah this is the problem, this is just addressing one core in the quad.
AFAIKS P9 may have the same problem though so I don't blame the
confusion.

The other patches seem good because we'll want a P10 quad too I think.

Thanks,
Nick