[Qemu-ppc] [PATCH for-2.13 07/13] target/ppc: Split page size information into a separate allocation

[David Gibson]

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.  Also rename its
      substructures to match qemu conventions.

    * Move structure definitions to the mmu-hash64.[ch] files.

Signed-off-by: David Gibson <address@hidden>
Reviewed-by: Greg Kurz <address@hidden>
Reviewed-by: Cédric Le Goater <address@hidden>
---
 hw/ppc/fdt.c                |  4 +--
 target/ppc/cpu-qom.h        |  4 +--
 target/ppc/cpu.h            | 26 +++----------------
 target/ppc/kvm.c            |  4 +--
 target/ppc/mmu-hash64.c     | 61 +++++++++++++++++++++++++++++++++------------
 target/ppc/mmu-hash64.h     | 22 ++++++++++++++++
 target/ppc/translate_init.c | 36 +++-----------------------
 7 files changed, 80 insertions(+), 77 deletions(-)

diff --git a/hw/ppc/fdt.c b/hw/ppc/fdt.c
index 2721603ffa..0828ad7254 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];
+        PPCHash64SegmentPageSizes *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..1c5c33ca11 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -327,11 +327,13 @@ union ppc_tlb_t {
 #define TLB_MAS                3
 #endif
 
+typedef struct PPCHash64SegmentPageSizes PPCHash64SegmentPageSizes;
+
 typedef struct ppc_slb_t ppc_slb_t;
 struct ppc_slb_t {
     uint64_t esid;
     uint64_t vsid;
-    const struct ppc_one_seg_page_size *sps;
+    const PPCHash64SegmentPageSizes *sps;
 };
 
 #define MAX_SLB_ENTRIES         64
@@ -948,28 +950,8 @@ 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 +1088,6 @@ 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 +1208,7 @@ 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..bc6d0a8314 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];
+        PPCHash64SegmentPageSizes *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..6758afd9de 100644
--- a/target/ppc/mmu-hash64.c
+++ b/target/ppc/mmu-hash64.c
@@ -148,7 +148,7 @@ int ppc_store_slb(PowerPCCPU *cpu, target_ulong slot,
 {
     CPUPPCState *env = &cpu->env;
     ppc_slb_t *slb = &env->slb[slot];
-    const struct ppc_one_seg_page_size *sps = NULL;
+    const PPCHash64SegmentPageSizes *sps = NULL;
     int i;
 
     if (slot >= env->slb_nr) {
@@ -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 PPCHash64SegmentPageSizes *sps1 = &cpu->hash64_opts->sps[i];
 
         if (!sps1->page_shift) {
             break;
@@ -451,8 +451,8 @@ void ppc_hash64_unmap_hptes(PowerPCCPU *cpu, const 
ppc_hash_pte64_t *hptes,
                         false, n * HASH_PTE_SIZE_64);
 }
 
-static unsigned hpte_page_shift(const struct ppc_one_seg_page_size *sps,
-    uint64_t pte0, uint64_t pte1)
+static unsigned hpte_page_shift(const PPCHash64SegmentPageSizes *sps,
+                                uint64_t pte0, uint64_t pte1)
 {
     int i;
 
@@ -466,7 +466,7 @@ static unsigned hpte_page_shift(const struct 
ppc_one_seg_page_size *sps,
     }
 
     for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) {
-        const struct ppc_one_page_size *ps = &sps->enc[i];
+        const PPCHash64PageSize *ps = &sps->enc[i];
         uint64_t mask;
 
         if (!ps->page_shift) {
@@ -489,7 +489,7 @@ static unsigned hpte_page_shift(const struct 
ppc_one_seg_page_size *sps,
 }
 
 static hwaddr ppc_hash64_pteg_search(PowerPCCPU *cpu, hwaddr hash,
-                                     const struct ppc_one_seg_page_size *sps,
+                                     const PPCHash64SegmentPageSizes *sps,
                                      target_ulong ptem,
                                      ppc_hash_pte64_t *pte, unsigned *pshift)
 {
@@ -543,7 +543,7 @@ static hwaddr ppc_hash64_htab_lookup(PowerPCCPU *cpu,
     CPUPPCState *env = &cpu->env;
     hwaddr hash, ptex;
     uint64_t vsid, epnmask, epn, ptem;
-    const struct ppc_one_seg_page_size *sps = slb->sps;
+    const PPCHash64SegmentPageSizes *sps = slb->sps;
 
     /* The SLB store path should prevent any bad page size encodings
      * getting in there, so: */
@@ -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 PPCHash64SegmentPageSizes *sps = &cpu->hash64_opts->sps[i];
         unsigned shift;
 
         if (!sps->page_shift) {
@@ -980,7 +979,7 @@ void ppc_hash64_update_rmls(PowerPCCPU *cpu)
 void ppc_hash64_update_vrma(PowerPCCPU *cpu)
 {
     CPUPPCState *env = &cpu->env;
-    const struct ppc_one_seg_page_size *sps = NULL;
+    const PPCHash64SegmentPageSizes *sps = NULL;
     target_ulong esid, vsid, lpcr;
     ppc_slb_t *slb = &env->vrma_slb;
     uint32_t vrmasd;
@@ -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 PPCHash64SegmentPageSizes *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..957bd68e33 100644
--- a/target/ppc/mmu-hash64.h
+++ b/target/ppc/mmu-hash64.h
@@ -136,6 +136,28 @@ static inline uint64_t ppc_hash64_hpte1(PowerPCCPU *cpu,
     return ldq_p(&(hptes[i].pte1));
 }
 
+/*
+ * MMU Options
+ */
+
+struct PPCHash64PageSize {
+    uint32_t page_shift;  /* Page shift (or 0) */
+    uint32_t pte_enc;     /* Encoding in the HPTE (>>12) */
+};
+typedef struct PPCHash64PageSize PPCHash64PageSize;
+
+struct PPCHash64SegmentPageSizes {
+    uint32_t page_shift;  /* Base page shift of segment (or 0) */
+    uint32_t slb_enc;     /* SLB encoding for BookS */
+    PPCHash64PageSize enc[PPC_PAGE_SIZES_MAX_SZ];
+};
+
+struct PPCHash64Options {
+    PPCHash64SegmentPageSizes 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;
-- 
2.14.3