target-ppc: Helper to determine page size information from hpte alone

h_enter() in the spapr code needs to know the page size of the HPTE it's
about to insert.  Unlike other paths that do this, it doesn't have access
to the SLB, so at the moment it determines this with some open-coded
tests which assume POWER7 or POWER8 page size encodings.

To make this more flexible add ppc_hash64_hpte_page_shift_noslb() to
determine both the "base" page size per segment, and the individual
effective page size from an HPTE alone.

This means that the spapr code should now be able to handle any page size
listed in the env->sps table.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Alexander Graf <agraf@suse.de>

2 files changed, 38 insertions, 0 deletions

diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c
index 565a0f4..6d110ee 100644
--- a/target-ppc/mmu-hash64.c
+++ b/target-ppc/mmu-hash64.c
@@ -513,6 +513,41 @@ static unsigned hpte_page_shift(const struct ppc_one_seg_page_size *sps,
     return 0; /* Bad page size encoding */
 }
 
+unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
+                                          uint64_t pte0, uint64_t pte1,
+                                          unsigned *seg_page_shift)
+{
+    CPUPPCState *env = &cpu->env;
+    int i;
+
+    if (!(pte0 & HPTE64_V_LARGE)) {
+        *seg_page_shift = 12;
+        return 12;
+    }
+
+    /*
+     * The encodings in env->sps need to be carefully chosen so that
+     * 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];
+        unsigned shift;
+
+        if (!sps->page_shift) {
+            break;
+        }
+
+        shift = hpte_page_shift(sps, pte0, pte1);
+        if (shift) {
+            *seg_page_shift = sps->page_shift;
+            return shift;
+        }
+    }
+
+    *seg_page_shift = 0;
+    return 0;
+}
+
 int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, target_ulong eaddr,
                                 int rwx, int mmu_idx)
 {
diff --git a/target-ppc/mmu-hash64.h b/target-ppc/mmu-hash64.h
index 293a951..34cf975 100644
--- a/target-ppc/mmu-hash64.h
+++ b/target-ppc/mmu-hash64.h
@@ -16,6 +16,9 @@ void ppc_hash64_store_hpte(PowerPCCPU *cpu, target_ulong index,
 void ppc_hash64_tlb_flush_hpte(PowerPCCPU *cpu,
                                target_ulong pte_index,
                                target_ulong pte0, target_ulong pte1);
+unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu,
+                                          uint64_t pte0, uint64_t pte1,
+                                          unsigned *seg_page_shift);
 #endif
 
 /*