accel/hvf: Simplify hvf_set_phys_mem

All of the complicated parts of updating the address space
are handled by address_space_update_topology_pass.
Do not create or use hvf_slot structures.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
Message-ID: <20260112103034.65310-9-philmd@linaro.org>

accel/hvf/hvf-all.c

@@ -87,45 +87,16 @@ void hvf_unprotect_dirty_range(hwaddr addr, size_t size)
                      HV_MEMORY_READ | HV_MEMORY_WRITE | HV_MEMORY_EXEC);
 }
 
-static int do_hvf_set_memory(hvf_slot *slot, hv_memory_flags_t flags)
-{
-    struct mac_slot *macslot;
-    hv_return_t ret;
-
-    macslot = &mac_slots[slot->slot_id];
-
-    if (macslot->present) {
-        if (macslot->size != slot->size) {
-            macslot->present = 0;
-            trace_hvf_vm_unmap(macslot->gpa_start, macslot->size);
-            ret = hv_vm_unmap(macslot->gpa_start, macslot->size);
-            assert_hvf_ok(ret);
-        }
-    }
-
-    if (!slot->size) {
-        return 0;
-    }
-
-    macslot->present = 1;
-    macslot->gpa_start = slot->start;
-    macslot->size = slot->size;
-    trace_hvf_vm_map(slot->start, slot->size, slot->mem, flags,
-                     flags & HV_MEMORY_READ ?  'R' : '-',
-                     flags & HV_MEMORY_WRITE ? 'W' : '-',
-                     flags & HV_MEMORY_EXEC ?  'X' : '-');
-    ret = hv_vm_map(slot->mem, slot->start, slot->size, flags);
-    assert_hvf_ok(ret);
-    return 0;
-}
-
 static void hvf_set_phys_mem(MemoryRegionSection *section, bool add)
 {
-    hvf_slot *mem;
     MemoryRegion *area = section->mr;
     bool writable = !area->readonly && !area->rom_device;
     hv_memory_flags_t flags;
     uint64_t page_size = qemu_real_host_page_size();
+    uint64_t gpa = section->offset_within_address_space;
+    uint64_t size = int128_get64(section->size);
+    hv_return_t ret;
+    void *mem;
 
     if (!memory_region_is_ram(area)) {
         if (writable) {
@@ -139,69 +110,28 @@ static void hvf_set_phys_mem(MemoryRegionSection *section, bool add)
         }
     }
 
-    if (!QEMU_IS_ALIGNED(int128_get64(section->size), page_size) ||
-        !QEMU_IS_ALIGNED(section->offset_within_address_space, page_size)) {
+    if (!QEMU_IS_ALIGNED(size, page_size) ||
+        !QEMU_IS_ALIGNED(gpa, page_size)) {
         /* Not page aligned, so we can not map as RAM */
         add = false;
     }
 
-    mem = hvf_find_overlap_slot(
-            section->offset_within_address_space,
-            int128_get64(section->size));
-
-    if (mem && add) {
-        if (mem->size == int128_get64(section->size) &&
-            mem->start == section->offset_within_address_space &&
-            mem->mem == (memory_region_get_ram_ptr(area) +
-            section->offset_within_region)) {
-            return; /* Same region was attempted to register, go away. */
-        }
-    }
-
-    /* Region needs to be reset. set the size to 0 and remap it. */
-    if (mem) {
-        mem->size = 0;
-        if (do_hvf_set_memory(mem, 0)) {
-            error_report("Failed to reset overlapping slot");
-            abort();
-        }
-    }
-
     if (!add) {
+        trace_hvf_vm_unmap(gpa, size);
+        ret = hv_vm_unmap(gpa, size);
+        assert_hvf_ok(ret);
         return;
     }
 
-    if (area->readonly ||
-        (!memory_region_is_ram(area) && memory_region_is_romd(area))) {
-        flags = HV_MEMORY_READ | HV_MEMORY_EXEC;
-    } else {
-        flags = HV_MEMORY_READ | HV_MEMORY_WRITE | HV_MEMORY_EXEC;
-    }
-
-    /* Now make a new slot. */
-    int x;
+    flags = HV_MEMORY_READ | HV_MEMORY_EXEC | (writable ? HV_MEMORY_WRITE : 0);
+    mem = memory_region_get_ram_ptr(area) + section->offset_within_region;
 
-    for (x = 0; x < hvf_state->num_slots; ++x) {
-        mem = &hvf_state->slots[x];
-        if (!mem->size) {
-            break;
-        }
-    }
-
-    if (x == hvf_state->num_slots) {
-        error_report("No free slots");
-        abort();
-    }
-
-    mem->size = int128_get64(section->size);
-    mem->mem = memory_region_get_ram_ptr(area) + section->offset_within_region;
-    mem->start = section->offset_within_address_space;
-    mem->region = area;
-
-    if (do_hvf_set_memory(mem, flags)) {
-        error_report("Error registering new memory slot");
-        abort();
-    }
+    trace_hvf_vm_map(gpa, size, mem, flags,
+                     flags & HV_MEMORY_READ ?  'R' : '-',
+                     flags & HV_MEMORY_WRITE ? 'W' : '-',
+                     flags & HV_MEMORY_EXEC ?  'X' : '-');
+    ret = hv_vm_map(mem, gpa, size, flags);
+    assert_hvf_ok(ret);
 }
 
 static void hvf_log_start(MemoryListener *listener,
@@ -260,7 +190,6 @@ static MemoryListener hvf_memory_listener = {
 
 static int hvf_accel_init(AccelState *as, MachineState *ms)
 {
-    int x;
     hv_return_t ret;
     HVFState *s = HVF_STATE(as);
     int pa_range = 36;
@@ -281,12 +210,6 @@ static int hvf_accel_init(AccelState *as, MachineState *ms)
     }
     assert_hvf_ok(ret);
 
-    s->num_slots = ARRAY_SIZE(s->slots);
-    for (x = 0; x < s->num_slots; ++x) {
-        s->slots[x].size = 0;
-        s->slots[x].slot_id = x;
-    }
-
     QTAILQ_INIT(&s->hvf_sw_breakpoints);
 
     hvf_state = s;