Re: [PATCH v2 02/14] spapr: nested: Introduce SpaprMachineStateNested to store related info.

["Nicholas Piggin" <npiggin@gmail.com>]

On Thu Oct 12, 2023 at 8:49 PM AEST, Harsh Prateek Bora wrote:
> Currently, nested_ptcr is being used by existing nested-hv API to store
> nested guest related info. This need to be organised to extend support
> for the nested PAPR API which would need to store additional info related
> to nested guests in next series of patches.
>
> Signed-off-by: Michael Neuling <mikey@neuling.org>
> Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>

> ---
>  hw/ppc/spapr_nested.c         | 8 ++++----
>  include/hw/ppc/spapr.h        | 3 ++-
>  include/hw/ppc/spapr_nested.h | 5 +++++
>  3 files changed, 11 insertions(+), 5 deletions(-)
>
> diff --git a/hw/ppc/spapr_nested.c b/hw/ppc/spapr_nested.c
> index 123e127b08..db47c1196f 100644
> --- a/hw/ppc/spapr_nested.c
> +++ b/hw/ppc/spapr_nested.c
> @@ -15,8 +15,8 @@ bool spapr_get_pate_nested(SpaprMachineState *spapr, PowerPCCPU *cpu,
>  
>      assert(lpid != 0);
>  
> -    patb = spapr->nested_ptcr & PTCR_PATB;
> -    pats = spapr->nested_ptcr & PTCR_PATS;
> +    patb = spapr->nested.ptcr & PTCR_PATB;
> +    pats = spapr->nested.ptcr & PTCR_PATS;
>  
>      /* Check if partition table is properly aligned */
>      if (patb & MAKE_64BIT_MASK(0, pats + 12)) {
> @@ -54,7 +54,7 @@ static target_ulong h_set_ptbl(PowerPCCPU *cpu,
>          return H_PARAMETER;
>      }
>  
> -    spapr->nested_ptcr = ptcr; /* Save new partition table */
> +    spapr->nested.ptcr = ptcr; /* Save new partition table */
>  
>      return H_SUCCESS;
>  }
> @@ -186,7 +186,7 @@ static target_ulong h_enter_nested(PowerPCCPU *cpu,
>      struct kvmppc_pt_regs *regs;
>      hwaddr len;
>  
> -    if (spapr->nested_ptcr == 0) {
> +    if (spapr->nested.ptcr == 0) {
>          return H_NOT_AVAILABLE;
>      }
>  
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index e91791a1a9..3e825f2787 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -12,6 +12,7 @@
>  #include "hw/ppc/spapr_xive.h"  /* For SpaprXive */
>  #include "hw/ppc/xics.h"        /* For ICSState */
>  #include "hw/ppc/spapr_tpm_proxy.h"
> +#include "hw/ppc/spapr_nested.h" /* For SpaprMachineStateNested */
>  
>  struct SpaprVioBus;
>  struct SpaprPhbState;
> @@ -213,7 +214,7 @@ struct SpaprMachineState {
>      uint32_t vsmt;       /* Virtual SMT mode (KVM's "core stride") */
>  
>      /* Nested HV support (TCG only) */
> -    uint64_t nested_ptcr;
> +    SpaprMachineStateNested nested;
>  
>      Notifier epow_notifier;
>      QTAILQ_HEAD(, SpaprEventLogEntry) pending_events;
> diff --git a/include/hw/ppc/spapr_nested.h b/include/hw/ppc/spapr_nested.h
> index e3d15d6d0b..0722b999cd 100644
> --- a/include/hw/ppc/spapr_nested.h
> +++ b/include/hw/ppc/spapr_nested.h
> @@ -4,6 +4,10 @@
>  #include "qemu/osdep.h"
>  #include "target/ppc/cpu.h"
>  
> +typedef struct SpaprMachineStateNested {
> +    uint64_t ptcr;
> +} SpaprMachineStateNested;
> +
>  /*
>   * Register state for entering a nested guest with H_ENTER_NESTED.
>   * New member must be added at the end.
> @@ -98,6 +102,7 @@ struct nested_ppc_state {
>  
>  void spapr_register_nested(void);
>  void spapr_exit_nested(PowerPCCPU *cpu, int excp);
> +typedef struct SpaprMachineState SpaprMachineState;
>  bool spapr_get_pate_nested(SpaprMachineState *spapr, PowerPCCPU *cpu,
>                             target_ulong lpid, ppc_v3_pate_t *entry);
>  #endif /* HW_SPAPR_NESTED_H */