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memory: Switch memory from using AddressSpace to FlatView

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FlatView's will be shared between AddressSpace's and subpage_t
and MemoryRegionSection cannot store AS anymore, hence this change.

In particular, for:

 typedef struct subpage_t {
     MemoryRegion iomem;
-    AddressSpace *as;
+    FlatView *fv;
     hwaddr base;
     uint16_t sub_section[];
 } subpage_t;

  struct MemoryRegionSection {
     MemoryRegion *mr;
-    AddressSpace *address_space;
+    FlatView *fv;
     hwaddr offset_within_region;
     Int128 size;
     hwaddr offset_within_address_space;
     bool readonly;
 };

This should cause no behavioural change.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20170921085110.25598-7-aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2017-09-21 18:50:58 +10:00 • committed by Paolo Bonzini
parent c775252378
commit 166206845f
5 changed files with 159 additions and 109 deletions
Download patch file Download diff file Expand all files Collapse all files

33
memory.c
View file

@ -154,7 +154,8 @@ enum ListenerDirection { Forward, Reverse };
/* No need to ref/unref .mr, the FlatRange keeps it alive. */
#define MEMORY_LISTENER_UPDATE_REGION(fr, as, dir, callback, _args...) \
do { \
MemoryRegionSection mrs = section_from_flat_range(fr, as); \
MemoryRegionSection mrs = section_from_flat_range(fr, \
address_space_to_flatview(as)); \
MEMORY_LISTENER_CALL(as, callback, dir, &mrs, ##_args); \
} while(0)
@ -208,7 +209,6 @@ static bool memory_region_ioeventfd_equal(MemoryRegionIoeventfd a,
}
typedef struct FlatRange FlatRange;
typedef struct FlatView FlatView;
/* Range of memory in the global map. Addresses are absolute. */
struct FlatRange {
@ -238,11 +238,11 @@ typedef struct AddressSpaceOps AddressSpaceOps;
for (var = (view)->ranges; var < (view)->ranges + (view)->nr; ++var)
static inline MemoryRegionSection
section_from_flat_range(FlatRange *fr, AddressSpace *as)
section_from_flat_range(FlatRange *fr, FlatView *fv)
{
return (MemoryRegionSection) {
.mr = fr->mr,
.address_space = as,
.fv = fv,
.offset_within_region = fr->offset_in_region,
.size = fr->addr.size,
.offset_within_address_space = int128_get64(fr->addr.start),
@ -312,7 +312,7 @@ static void flatview_unref(FlatView *view)
}
}
static FlatView *address_space_to_flatview(AddressSpace *as)
FlatView *address_space_to_flatview(AddressSpace *as)
{
return atomic_rcu_read(&as->current_map);
}
@ -761,7 +761,7 @@ static void address_space_add_del_ioeventfds(AddressSpace *as,
fds_new[inew]))) {
fd = &fds_old[iold];
section = (MemoryRegionSection) {
.address_space = as,
.fv = address_space_to_flatview(as),
.offset_within_address_space = int128_get64(fd->addr.start),
.size = fd->addr.size,
};
@ -774,7 +774,7 @@ static void address_space_add_del_ioeventfds(AddressSpace *as,
fds_old[iold]))) {
fd = &fds_new[inew];
section = (MemoryRegionSection) {
.address_space = as,
.fv = address_space_to_flatview(as),
.offset_within_address_space = int128_get64(fd->addr.start),
.size = fd->addr.size,
};
@ -794,7 +794,7 @@ static FlatView *address_space_get_flatview(AddressSpace *as)
rcu_read_lock();
do {
view = atomic_rcu_read(&as->current_map);
view = address_space_to_flatview(as);
/* If somebody has replaced as->current_map concurrently,
* flatview_ref returns false.
*/
@ -913,8 +913,8 @@ static void address_space_update_topology(AddressSpace *as)
new_view->dispatch = mem_begin(as);
for (i = 0; i < new_view->nr; i++) {
MemoryRegionSection mrs =
section_from_flat_range(&new_view->ranges[i], as);
mem_add(as, new_view, &mrs);
section_from_flat_range(&new_view->ranges[i], new_view);
mem_add(new_view, &mrs);
}
mem_commit(new_view->dispatch);
@ -1870,7 +1870,7 @@ void memory_region_sync_dirty_bitmap(MemoryRegion *mr)
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->mr == mr) {
MemoryRegionSection mrs = section_from_flat_range(fr, as);
MemoryRegionSection mrs = section_from_flat_range(fr, view);
listener->log_sync(listener, &mrs);
}
}
@ -1973,7 +1973,7 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa
FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->mr == mr) {
section = (MemoryRegionSection) {
.address_space = as,
.fv = view,
.offset_within_address_space = int128_get64(fr->addr.start),
.size = fr->addr.size,
};
@ -2324,7 +2324,7 @@ static MemoryRegionSection memory_region_find_rcu(MemoryRegion *mr,
}
range = addrrange_make(int128_make64(addr), int128_make64(size));
view = atomic_rcu_read(&as->current_map);
view = address_space_to_flatview(as);
fr = flatview_lookup(view, range);
if (!fr) {
return ret;
@ -2335,7 +2335,7 @@ static MemoryRegionSection memory_region_find_rcu(MemoryRegion *mr,
}
ret.mr = fr->mr;
ret.address_space = as;
ret.fv = view;
range = addrrange_intersection(range, fr->addr);
ret.offset_within_region = fr->offset_in_region;
ret.offset_within_region += int128_get64(int128_sub(range.start,
@ -2384,7 +2384,8 @@ void memory_global_dirty_log_sync(void)
view = address_space_get_flatview(as);
FOR_EACH_FLAT_RANGE(fr, view) {
if (fr->dirty_log_mask) {
MemoryRegionSection mrs = section_from_flat_range(fr, as);
MemoryRegionSection mrs = section_from_flat_range(fr, view);
listener->log_sync(listener, &mrs);
}
}
@ -2469,7 +2470,7 @@ static void listener_add_address_space(MemoryListener *listener,
FOR_EACH_FLAT_RANGE(fr, view) {
MemoryRegionSection section = {
.mr = fr->mr,
.address_space = as,
.fv = view,
.offset_within_region = fr->offset_in_region,
.size = fr->addr.size,
.offset_within_address_space = int128_get64(fr->addr.start),