qemu-ppc
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Qemu-ppc] [PATCH for-2.13 05/13] target/ppc: Remove fallback 64k pagesi


From: David Gibson
Subject: [Qemu-ppc] [PATCH for-2.13 05/13] target/ppc: Remove fallback 64k pagesize information
Date: Thu, 5 Apr 2018 12:14:29 +1000

CPU definitions for cpus with the 64-bit hash MMU can include a table of
available pagesizes.  If this isn't supplied ppc_cpu_instance_init() will
fill it in a fallback table based on the POWERPC_MMU_64K bit in mmu_model.

However, it turns out all the cpus which support 64K pages already include
an explicit table of page sizes, so there's no point to the fallback table
including 64k pages.

That removes the only place which tests POWERPC_MMU_64K, so we can remove
it.  Which in turn allows some logic to be removed from
kvm_fixup_page_sizes().

Signed-off-by: David Gibson <address@hidden>
Reviewed-by: C├ędric Le Goater <address@hidden>
Reviewed-by: Greg Kurz <address@hidden>
---
 target/ppc/cpu-qom.h        |  4 ----
 target/ppc/kvm.c            |  7 -------
 target/ppc/translate_init.c | 20 ++------------------
 3 files changed, 2 insertions(+), 29 deletions(-)

diff --git a/target/ppc/cpu-qom.h b/target/ppc/cpu-qom.h
index deaa46a14b..9bbb05cf62 100644
--- a/target/ppc/cpu-qom.h
+++ b/target/ppc/cpu-qom.h
@@ -70,7 +70,6 @@ enum powerpc_mmu_t {
 #define POWERPC_MMU_64       0x00010000
 #define POWERPC_MMU_1TSEG    0x00020000
 #define POWERPC_MMU_AMR      0x00040000
-#define POWERPC_MMU_64K      0x00080000
 #define POWERPC_MMU_V3       0x00100000 /* ISA V3.00 MMU Support */
     /* 64 bits PowerPC MMU                                     */
     POWERPC_MMU_64B        = POWERPC_MMU_64 | 0x00000001,
@@ -78,15 +77,12 @@ enum powerpc_mmu_t {
     POWERPC_MMU_2_03       = POWERPC_MMU_64 | 0x00000002,
     /* Architecture 2.06 variant                               */
     POWERPC_MMU_2_06       = POWERPC_MMU_64 | POWERPC_MMU_1TSEG
-                             | POWERPC_MMU_64K
                              | POWERPC_MMU_AMR | 0x00000003,
     /* Architecture 2.07 variant                               */
     POWERPC_MMU_2_07       = POWERPC_MMU_64 | POWERPC_MMU_1TSEG
-                             | POWERPC_MMU_64K
                              | POWERPC_MMU_AMR | 0x00000004,
     /* Architecture 3.00 variant                               */
     POWERPC_MMU_3_00       = POWERPC_MMU_64 | POWERPC_MMU_1TSEG
-                             | POWERPC_MMU_64K
                              | POWERPC_MMU_AMR | POWERPC_MMU_V3
                              | 0x00000005,
 };
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index 79a436a384..6160356a4a 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -425,7 +425,6 @@ static void kvm_fixup_page_sizes(PowerPCCPU *cpu)
     static bool has_smmu_info;
     CPUPPCState *env = &cpu->env;
     int iq, ik, jq, jk;
-    bool has_64k_pages = false;
 
     /* We only handle page sizes for 64-bit server guests for now */
     if (!(env->mmu_model & POWERPC_MMU_64)) {
@@ -471,9 +470,6 @@ static void kvm_fixup_page_sizes(PowerPCCPU *cpu)
                                      ksps->enc[jk].page_shift)) {
                 continue;
             }
-            if (ksps->enc[jk].page_shift == 16) {
-                has_64k_pages = true;
-            }
             qsps->enc[jq].page_shift = ksps->enc[jk].page_shift;
             qsps->enc[jq].pte_enc = ksps->enc[jk].pte_enc;
             if (++jq >= PPC_PAGE_SIZES_MAX_SZ) {
@@ -488,9 +484,6 @@ static void kvm_fixup_page_sizes(PowerPCCPU *cpu)
     if (!(smmu_info.flags & KVM_PPC_1T_SEGMENTS)) {
         env->mmu_model &= ~POWERPC_MMU_1TSEG;
     }
-    if (!has_64k_pages) {
-        env->mmu_model &= ~POWERPC_MMU_64K;
-    }
 }
 
 bool kvmppc_is_mem_backend_page_size_ok(const char *obj_path)
diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c
index 29bd6f3654..99be6fcd68 100644
--- a/target/ppc/translate_init.c
+++ b/target/ppc/translate_init.c
@@ -10469,7 +10469,7 @@ static void ppc_cpu_instance_init(Object *obj)
         env->sps = *pcc->sps;
     } 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_4k = {
+        static const struct ppc_segment_page_sizes defsps = {
             .sps = {
                 { .page_shift = 12, /* 4K */
                   .slb_enc = 0,
@@ -10481,23 +10481,7 @@ static void ppc_cpu_instance_init(Object *obj)
                 },
             },
         };
-        static const struct ppc_segment_page_sizes defsps_64k = {
-            .sps = {
-                { .page_shift = 12, /* 4K */
-                  .slb_enc = 0,
-                  .enc = { { .page_shift = 12, .pte_enc = 0 } }
-                },
-                { .page_shift = 16, /* 64K */
-                  .slb_enc = 0x110,
-                  .enc = { { .page_shift = 16, .pte_enc = 1 } }
-                },
-                { .page_shift = 24, /* 16M */
-                  .slb_enc = 0x100,
-                  .enc = { { .page_shift = 24, .pte_enc = 0 } }
-                },
-            },
-        };
-        env->sps = (env->mmu_model & POWERPC_MMU_64K) ? defsps_64k : defsps_4k;
+        env->sps = defsps;
     }
 #endif /* defined(TARGET_PPC64) */
 }
-- 
2.14.3




reply via email to

[Prev in Thread] Current Thread [Next in Thread]