Re: [Qemu-devel] [RFC for-2.13 07/12] target/ppc: Split page size information into a separate allocation

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Mar 28, 2018 at 09:28:41AM +0200, Cédric Le Goater wrote:
> On 03/27/2018 06:37 AM, David Gibson wrote:
> > env->sps contains page size encoding information as an embedded structure.
> > Since this information is specific to 64-bit hash MMUs, split it out into
> > a separately allocated structure, to reduce the basic env size for other
> > cpus.  Along the way we make a few other cleanups:
> > 
> >     * Rename to PPCHash64Options which is more in line with qemu name
> >       conventions, and reflects that we're going to merge some more hash64
> >       mmu specific details in there in future
> > 
> >     * Move structure definitions to the mmu-hash64.[ch] files.
> > 
> > Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> 
> 
> Reviewed-by: Cédric Le Goater <clg@kaod.org>
> 
> While you are at changing things, maybe you could CamelCase 
> 
> 	struct ppc_one_seg_page_size
> 	struct ppc_one_page_size

Good idea, I'll include that in the next spin.

> 
> No big deal.
> 
> Thanks,
> 
> C.
> 
> > ---
> >  hw/ppc/fdt.c                |  4 ++--
> >  target/ppc/cpu-qom.h        |  4 ++--
> >  target/ppc/cpu.h            | 22 +--------------------
> >  target/ppc/kvm.c            |  4 ++--
> >  target/ppc/mmu-hash64.c     | 47 ++++++++++++++++++++++++++++++++++++---------
> >  target/ppc/mmu-hash64.h     | 21 ++++++++++++++++++++
> >  target/ppc/translate_init.c | 36 +++-------------------------------
> >  7 files changed, 69 insertions(+), 69 deletions(-)
> > 
> > diff --git a/hw/ppc/fdt.c b/hw/ppc/fdt.c
> > index 2721603ffa..c4ba16f6b4 100644
> > --- a/hw/ppc/fdt.c
> > +++ b/hw/ppc/fdt.c
> > @@ -9,6 +9,7 @@
> >  
> >  #include "qemu/osdep.h"
> >  #include "target/ppc/cpu.h"
> > +#include "target/ppc/mmu-hash64.h"
> >  
> >  #include "hw/ppc/fdt.h"
> >  
> > @@ -16,13 +17,12 @@
> >  size_t ppc_create_page_sizes_prop(PowerPCCPU *cpu, uint32_t *prop,
> >                                    size_t maxsize)
> >  {
> > -    CPUPPCState *env = &cpu->env;
> >      size_t maxcells = maxsize / sizeof(uint32_t);
> >      int i, j, count;
> >      uint32_t *p = prop;
> >  
> >      for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
> > -        struct ppc_one_seg_page_size *sps = &env->sps.sps[i];
> > +        struct ppc_one_seg_page_size *sps = &cpu->hash64_opts->sps[i];
> >  
> >          if (!sps->page_shift) {
> >              break;
> > diff --git a/target/ppc/cpu-qom.h b/target/ppc/cpu-qom.h
> > index 9bbb05cf62..3e5ef7375f 100644
> > --- a/target/ppc/cpu-qom.h
> > +++ b/target/ppc/cpu-qom.h
> > @@ -160,7 +160,7 @@ enum powerpc_input_t {
> >      PPC_FLAGS_INPUT_RCPU,
> >  };
> >  
> > -struct ppc_segment_page_sizes;
> > +typedef struct PPCHash64Options PPCHash64Options;
> >  
> >  /**
> >   * PowerPCCPUClass:
> > @@ -194,7 +194,7 @@ typedef struct PowerPCCPUClass {
> >      uint32_t flags;
> >      int bfd_mach;
> >      uint32_t l1_dcache_size, l1_icache_size;
> > -    const struct ppc_segment_page_sizes *sps;
> > +    const PPCHash64Options *hash64_opts;
> >      struct ppc_radix_page_info *radix_page_info;
> >      void (*init_proc)(CPUPPCState *env);
> >      int  (*check_pow)(CPUPPCState *env);
> > diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
> > index c621a6bd5e..fb6c578eb5 100644
> > --- a/target/ppc/cpu.h
> > +++ b/target/ppc/cpu.h
> > @@ -948,28 +948,8 @@ enum {
> >  
> >  #define DBELL_PROCIDTAG_MASK           PPC_BITMASK(44, 63)
> >  
> > -/*****************************************************************************/
> > -/* Segment page size information, used by recent hash MMUs
> > - * The format of this structure mirrors kvm_ppc_smmu_info
> > - */
> > -
> >  #define PPC_PAGE_SIZES_MAX_SZ   8
> >  
> > -struct ppc_one_page_size {
> > -    uint32_t page_shift;  /* Page shift (or 0) */
> > -    uint32_t pte_enc;     /* Encoding in the HPTE (>>12) */
> > -};
> > -
> > -struct ppc_one_seg_page_size {
> > -    uint32_t page_shift;  /* Base page shift of segment (or 0) */
> > -    uint32_t slb_enc;     /* SLB encoding for BookS */
> > -    struct ppc_one_page_size enc[PPC_PAGE_SIZES_MAX_SZ];
> > -};
> > -
> > -struct ppc_segment_page_sizes {
> > -    struct ppc_one_seg_page_size sps[PPC_PAGE_SIZES_MAX_SZ];
> > -};
> > -
> >  struct ppc_radix_page_info {
> >      uint32_t count;
> >      uint32_t entries[PPC_PAGE_SIZES_MAX_SZ];
> > @@ -1106,7 +1086,6 @@ struct CPUPPCState {
> >      uint64_t insns_flags;
> >      uint64_t insns_flags2;
> >  #if defined(TARGET_PPC64)
> > -    struct ppc_segment_page_sizes sps;
> >      ppc_slb_t vrma_slb;
> >      target_ulong rmls;
> >      bool ci_large_pages;
> > @@ -1227,6 +1206,7 @@ struct PowerPCCPU {
> >      PPCVirtualHypervisor *vhyp;
> >      Object *intc;
> >      int32_t node_id; /* NUMA node this CPU belongs to */
> > +    PPCHash64Options *hash64_opts;
> >  
> >      /* Fields related to migration compatibility hacks */
> >      bool pre_2_8_migration;
> > diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
> > index 6160356a4a..01947169c9 100644
> > --- a/target/ppc/kvm.c
> > +++ b/target/ppc/kvm.c
> > @@ -442,7 +442,7 @@ static void kvm_fixup_page_sizes(PowerPCCPU *cpu)
> >      }
> >  
> >      /* Convert to QEMU form */
> > -    memset(&env->sps, 0, sizeof(env->sps));
> > +    memset(cpu->hash64_opts, 0, sizeof(*cpu->hash64_opts));
> >  
> >      /* If we have HV KVM, we need to forbid CI large pages if our
> >       * host page size is smaller than 64K.
> > @@ -456,7 +456,7 @@ static void kvm_fixup_page_sizes(PowerPCCPU *cpu)
> >       *     the selected CPU has with the capabilities that KVM supports.
> >       */
> >      for (ik = iq = 0; ik < KVM_PPC_PAGE_SIZES_MAX_SZ; ik++) {
> > -        struct ppc_one_seg_page_size *qsps = &env->sps.sps[iq];
> > +        struct ppc_one_seg_page_size *qsps = &cpu->hash64_opts->sps[iq];
> >          struct kvm_ppc_one_seg_page_size *ksps = &smmu_info.sps[ik];
> >  
> >          if (!kvm_valid_page_size(smmu_info.flags, max_cpu_page_size,
> > diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
> > index 4cb7d1cf07..d7a0e5615f 100644
> > --- a/target/ppc/mmu-hash64.c
> > +++ b/target/ppc/mmu-hash64.c
> > @@ -165,7 +165,7 @@ int ppc_store_slb(PowerPCCPU *cpu, target_ulong slot,
> >      }
> >  
> >      for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
> > -        const struct ppc_one_seg_page_size *sps1 = &env->sps.sps[i];
> > +        const struct ppc_one_seg_page_size *sps1 = &cpu->hash64_opts->sps[i];
> >  
> >          if (!sps1->page_shift) {
> >              break;
> > @@ -552,7 +552,7 @@ static hwaddr ppc_hash64_htab_lookup(PowerPCCPU *cpu,
> >      /* If ISL is set in LPCR we need to clamp the page size to 4K */
> >      if (env->spr[SPR_LPCR] & LPCR_ISL) {
> >          /* We assume that when using TCG, 4k is first entry of SPS */
> > -        sps = &env->sps.sps[0];
> > +        sps = &cpu->hash64_opts->sps[0];
> >          assert(sps->page_shift == 12);
> >      }
> >  
> > @@ -605,7 +605,6 @@ static hwaddr ppc_hash64_htab_lookup(PowerPCCPU *cpu,
> >  unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
> >                                            uint64_t pte0, uint64_t pte1)
> >  {
> > -    CPUPPCState *env = &cpu->env;
> >      int i;
> >  
> >      if (!(pte0 & HPTE64_V_LARGE)) {
> > @@ -617,7 +616,7 @@ unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
> >       * this gives an unambiguous result.
> >       */
> >      for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
> > -        const struct ppc_one_seg_page_size *sps = &env->sps.sps[i];
> > +        const struct ppc_one_seg_page_size *sps = &cpu->hash64_opts->sps[i];
> >          unsigned shift;
> >  
> >          if (!sps->page_shift) {
> > @@ -1005,7 +1004,7 @@ void ppc_hash64_update_vrma(PowerPCCPU *cpu)
> >      esid = SLB_ESID_V;
> >  
> >      for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
> > -        const struct ppc_one_seg_page_size *sps1 = &env->sps.sps[i];
> > +        const struct ppc_one_seg_page_size *sps1 = &cpu->hash64_opts->sps[i];
> >  
> >          if (!sps1->page_shift) {
> >              break;
> > @@ -1101,11 +1100,12 @@ void ppc_hash64_init(PowerPCCPU *cpu)
> >      CPUPPCState *env = &cpu->env;
> >      PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
> >  
> > -    if (pcc->sps) {
> > -        env->sps = *pcc->sps;
> > +    if (pcc->hash64_opts) {
> > +        cpu->hash64_opts = g_memdup(pcc->hash64_opts,
> > +                                    sizeof(*cpu->hash64_opts));
> >      } else if (env->mmu_model & POWERPC_MMU_64) {
> >          /* Use default sets of page sizes. We don't support MPSS */
> > -        static const struct ppc_segment_page_sizes defsps = {
> > +        static const PPCHash64Options defopts = {
> >              .sps = {
> >                  { .page_shift = 12, /* 4K */
> >                    .slb_enc = 0,
> > @@ -1117,10 +1117,39 @@ void ppc_hash64_init(PowerPCCPU *cpu)
> >                  },
> >              },
> >          };
> > -        env->sps = defsps;
> > +        cpu->hash64_opts = g_memdup(&defopts, sizeof(*cpu->hash64_opts));
> >      }
> >  }
> >  
> >  void ppc_hash64_finalize(PowerPCCPU *cpu)
> >  {
> > +    g_free(cpu->hash64_opts);
> >  }
> > +
> > +const PPCHash64Options ppc_hash64_opts_POWER7 = {
> > +    .sps = {
> > +        {
> > +            .page_shift = 12, /* 4K */
> > +            .slb_enc = 0,
> > +            .enc = { { .page_shift = 12, .pte_enc = 0 },
> > +                     { .page_shift = 16, .pte_enc = 0x7 },
> > +                     { .page_shift = 24, .pte_enc = 0x38 }, },
> > +        },
> > +        {
> > +            .page_shift = 16, /* 64K */
> > +            .slb_enc = SLB_VSID_64K,
> > +            .enc = { { .page_shift = 16, .pte_enc = 0x1 },
> > +                     { .page_shift = 24, .pte_enc = 0x8 }, },
> > +        },
> > +        {
> > +            .page_shift = 24, /* 16M */
> > +            .slb_enc = SLB_VSID_16M,
> > +            .enc = { { .page_shift = 24, .pte_enc = 0 }, },
> > +        },
> > +        {
> > +            .page_shift = 34, /* 16G */
> > +            .slb_enc = SLB_VSID_16G,
> > +            .enc = { { .page_shift = 34, .pte_enc = 0x3 }, },
> > +        },
> > +    }
> > +};
> > diff --git a/target/ppc/mmu-hash64.h b/target/ppc/mmu-hash64.h
> > index 074ded4c27..d42cbc2762 100644
> > --- a/target/ppc/mmu-hash64.h
> > +++ b/target/ppc/mmu-hash64.h
> > @@ -136,6 +136,27 @@ static inline uint64_t ppc_hash64_hpte1(PowerPCCPU *cpu,
> >      return ldq_p(&(hptes[i].pte1));
> >  }
> >  
> > +/*
> > + * MMU Options
> > + */
> > +
> > +struct ppc_one_page_size {
> > +    uint32_t page_shift;  /* Page shift (or 0) */
> > +    uint32_t pte_enc;     /* Encoding in the HPTE (>>12) */
> > +};
> > +
> > +struct ppc_one_seg_page_size {
> > +    uint32_t page_shift;  /* Base page shift of segment (or 0) */
> > +    uint32_t slb_enc;     /* SLB encoding for BookS */
> > +    struct ppc_one_page_size enc[PPC_PAGE_SIZES_MAX_SZ];
> > +};
> > +
> > +struct PPCHash64Options {
> > +    struct ppc_one_seg_page_size sps[PPC_PAGE_SIZES_MAX_SZ];
> > +};
> > +
> > +extern const PPCHash64Options ppc_hash64_opts_POWER7;
> > +
> >  #endif /* CONFIG_USER_ONLY */
> >  
> >  #if defined(CONFIG_USER_ONLY) || !defined(TARGET_PPC64)
> > diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
> > index aa63a5dcb3..040d6fbac3 100644
> > --- a/target/ppc/translate_init.c
> > +++ b/target/ppc/translate_init.c
> > @@ -8368,36 +8368,6 @@ static Property powerpc_servercpu_properties[] = {
> >      DEFINE_PROP_END_OF_LIST(),
> >  };
> >  
> > -#ifdef CONFIG_SOFTMMU
> > -static const struct ppc_segment_page_sizes POWER7_POWER8_sps = {
> > -    .sps = {
> > -        {
> > -            .page_shift = 12, /* 4K */
> > -            .slb_enc = 0,
> > -            .enc = { { .page_shift = 12, .pte_enc = 0 },
> > -                     { .page_shift = 16, .pte_enc = 0x7 },
> > -                     { .page_shift = 24, .pte_enc = 0x38 }, },
> > -        },
> > -        {
> > -            .page_shift = 16, /* 64K */
> > -            .slb_enc = SLB_VSID_64K,
> > -            .enc = { { .page_shift = 16, .pte_enc = 0x1 },
> > -                     { .page_shift = 24, .pte_enc = 0x8 }, },
> > -        },
> > -        {
> > -            .page_shift = 24, /* 16M */
> > -            .slb_enc = SLB_VSID_16M,
> > -            .enc = { { .page_shift = 24, .pte_enc = 0 }, },
> > -        },
> > -        {
> > -            .page_shift = 34, /* 16G */
> > -            .slb_enc = SLB_VSID_16G,
> > -            .enc = { { .page_shift = 34, .pte_enc = 0x3 }, },
> > -        },
> > -    }
> > -};
> > -#endif /* CONFIG_SOFTMMU */
> > -
> >  static void init_proc_POWER7(CPUPPCState *env)
> >  {
> >      /* Common Registers */
> > @@ -8526,7 +8496,7 @@ POWERPC_FAMILY(POWER7)(ObjectClass *oc, void *data)
> >      pcc->mmu_model = POWERPC_MMU_2_06;
> >  #if defined(CONFIG_SOFTMMU)
> >      pcc->handle_mmu_fault = ppc_hash64_handle_mmu_fault;
> > -    pcc->sps = &POWER7_POWER8_sps;
> > +    pcc->hash64_opts = &ppc_hash64_opts_POWER7;
> >  #endif
> >      pcc->excp_model = POWERPC_EXCP_POWER7;
> >      pcc->bus_model = PPC_FLAGS_INPUT_POWER7;
> > @@ -8698,7 +8668,7 @@ POWERPC_FAMILY(POWER8)(ObjectClass *oc, void *data)
> >      pcc->mmu_model = POWERPC_MMU_2_07;
> >  #if defined(CONFIG_SOFTMMU)
> >      pcc->handle_mmu_fault = ppc_hash64_handle_mmu_fault;
> > -    pcc->sps = &POWER7_POWER8_sps;
> > +    pcc->hash64_opts = &ppc_hash64_opts_POWER7;
> >  #endif
> >      pcc->excp_model = POWERPC_EXCP_POWER8;
> >      pcc->bus_model = PPC_FLAGS_INPUT_POWER7;
> > @@ -8893,7 +8863,7 @@ POWERPC_FAMILY(POWER9)(ObjectClass *oc, void *data)
> >  #if defined(CONFIG_SOFTMMU)
> >      pcc->handle_mmu_fault = ppc64_v3_handle_mmu_fault;
> >      /* segment page size remain the same */
> > -    pcc->sps = &POWER7_POWER8_sps;
> > +    pcc->hash64_opts = &ppc_hash64_opts_POWER7;
> >      pcc->radix_page_info = &POWER9_radix_page_info;
> >  #endif
> >      pcc->excp_model = POWERPC_EXCP_POWER8;
> > 
> 

-- 
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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