[Qemu-devel] [RFC v1 14/22] memory: manage coalesced mmio via a MemoryListener

[Avi Kivity <avi@redhat.com>]

Instead of calling a global function on coalesced mmio changes, which
routes the call to kvm if enabled, add coalesced mmio hooks to
MemoryListener and make kvm use that instead.

The motivation is support for multiple address spaces (which means we
we need to filter the call on the right address space) but the result
is cleaner as well.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 exec.c     | 13 -------------
 kvm-all.c  | 20 ++++++++++----------
 kvm-stub.c | 10 ----------
 kvm.h      |  2 --
 memory.c   | 24 ++++++++++++++++++++----
 memory.h   | 12 +++++++++++-
 6 files changed, 41 insertions(+), 40 deletions(-)

diff --git a/exec.c b/exec.c
index 1fd6a10..51a32e7 100644
--- a/exec.c
+++ b/exec.c
@@ -2313,19 +2313,6 @@ void cpu_register_physical_memory_log(MemoryRegionSection *section,
     }
 }
 
-
-void qemu_register_coalesced_mmio(target_phys_addr_t addr, ram_addr_t size)
-{
-    if (kvm_enabled())
-        kvm_coalesce_mmio_region(addr, size);
-}
-
-void qemu_unregister_coalesced_mmio(target_phys_addr_t addr, ram_addr_t size)
-{
-    if (kvm_enabled())
-        kvm_uncoalesce_mmio_region(addr, size);
-}
-
 void qemu_flush_coalesced_mmio_buffer(void)
 {
     if (kvm_enabled())
diff --git a/kvm-all.c b/kvm-all.c
index 5e9215d..25ca202 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -454,9 +454,10 @@ static int kvm_physical_sync_dirty_bitmap(MemoryRegionSection *section)
     return ret;
 }
 
-int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
+static void kvm_coalesce_mmio_region(MemoryListener *listener,
+                                     MemoryRegionSection *secion,
+                                     target_phys_addr_t start, ram_addr_t size)
 {
-    int ret = -ENOSYS;
     KVMState *s = kvm_state;
 
     if (s->coalesced_mmio) {
@@ -466,15 +467,14 @@ int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
         zone.size = size;
         zone.pad = 0;
 
-        ret = kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
+        (void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
     }
-
-    return ret;
 }
 
-int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
+static void kvm_uncoalesce_mmio_region(MemoryListener *listener,
+                                       MemoryRegionSection *secion,
+                                       target_phys_addr_t start, ram_addr_t size)
 {
-    int ret = -ENOSYS;
     KVMState *s = kvm_state;
 
     if (s->coalesced_mmio) {
@@ -484,10 +484,8 @@ int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
         zone.size = size;
         zone.pad = 0;
 
-        ret = kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
+        (void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
     }
-
-    return ret;
 }
 
 int kvm_check_extension(KVMState *s, unsigned int extension)
@@ -818,6 +816,8 @@ static void kvm_io_ioeventfd_del(MemoryListener *listener,
     .log_global_stop = kvm_log_global_stop,
     .eventfd_add = kvm_mem_ioeventfd_add,
     .eventfd_del = kvm_mem_ioeventfd_del,
+    .coalesced_mmio_add = kvm_coalesce_mmio_region,
+    .coalesced_mmio_del = kvm_uncoalesce_mmio_region,
     .priority = 10,
 };
 
diff --git a/kvm-stub.c b/kvm-stub.c
index 3c52eb5..a3455e2 100644
--- a/kvm-stub.c
+++ b/kvm-stub.c
@@ -29,16 +29,6 @@ int kvm_init_vcpu(CPUArchState *env)
     return -ENOSYS;
 }
 
-int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
-{
-    return -ENOSYS;
-}
-
-int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size)
-{
-    return -ENOSYS;
-}
-
 int kvm_init(void)
 {
     return -ENOSYS;
diff --git a/kvm.h b/kvm.h
index dea2998..eefcb49 100644
--- a/kvm.h
+++ b/kvm.h
@@ -129,8 +129,6 @@ void *kvm_vmalloc(ram_addr_t size);
 void *kvm_arch_vmalloc(ram_addr_t size);
 void kvm_setup_guest_memory(void *start, size_t size);
 
-int kvm_coalesce_mmio_region(target_phys_addr_t start, ram_addr_t size);
-int kvm_uncoalesce_mmio_region(target_phys_addr_t start, ram_addr_t size);
 void kvm_flush_coalesced_mmio_buffer(void);
 #endif
 
diff --git a/memory.c b/memory.c
index efefcb8..eb75349 100644
--- a/memory.c
+++ b/memory.c
@@ -1130,11 +1130,19 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa
     FlatRange *fr;
     CoalescedMemoryRange *cmr;
     AddrRange tmp;
+    MemoryRegionSection section;
 
     FOR_EACH_FLAT_RANGE(fr, as->current_map) {
         if (fr->mr == mr) {
-            qemu_unregister_coalesced_mmio(int128_get64(fr->addr.start),
-                                           int128_get64(fr->addr.size));
+            section = (MemoryRegionSection) {
+                .address_space = as->root,
+                .offset_within_address_space = int128_get64(fr->addr.start),
+                .size = int128_get64(fr->addr.size),
+            };
+
+            MEMORY_LISTENER_CALL(coalesced_mmio_del, Reverse, &section,
+                                 int128_get64(fr->addr.start),
+                                 int128_get64(fr->addr.size));
             QTAILQ_FOREACH(cmr, &mr->coalesced, link) {
                 tmp = addrrange_shift(cmr->addr,
                                       int128_sub(fr->addr.start,
@@ -1143,8 +1151,9 @@ static void memory_region_update_coalesced_range_as(MemoryRegion *mr, AddressSpa
                     continue;
                 }
                 tmp = addrrange_intersection(tmp, fr->addr);
-                qemu_register_coalesced_mmio(int128_get64(tmp.start),
-                                             int128_get64(tmp.size));
+                MEMORY_LISTENER_CALL(coalesced_mmio_add, Forward, &section,
+                                     int128_get64(tmp.start),
+                                     int128_get64(tmp.size));
             }
         }
     }
@@ -1529,6 +1538,13 @@ void memory_listener_default_eventfd(MemoryListener *listener,
 {
 }
 
+void memory_listener_default_coalesced_mmio(MemoryListener *listener,
+                                            MemoryRegionSection *section,
+                                            target_phys_addr_t addr,
+                                            target_phys_addr_t len)
+{
+}
+
 void address_space_init(AddressSpace *as, MemoryRegion *root)
 {
     memory_region_transaction_begin();
diff --git a/memory.h b/memory.h
index 0ef95cb..5f50bce 100644
--- a/memory.h
+++ b/memory.h
@@ -217,6 +217,10 @@ struct MemoryListener {
                         bool match_data, uint64_t data, EventNotifier *e);
     void (*eventfd_del)(MemoryListener *listener, MemoryRegionSection *section,
                         bool match_data, uint64_t data, EventNotifier *e);
+    void (*coalesced_mmio_add)(MemoryListener *listener, MemoryRegionSection *section,
+                               target_phys_addr_t addr, target_phys_addr_t len);
+    void (*coalesced_mmio_del)(MemoryListener *listener, MemoryRegionSection *section,
+                               target_phys_addr_t addr, target_phys_addr_t len);
     /* Lower = earlier (during add), later (during del) */
     unsigned priority;
     MemoryRegion *address_space_filter;
@@ -235,7 +239,9 @@ struct MemoryListener {
     .log_global_start = memory_listener_default_global,     \
     .log_global_stop = memory_listener_default_global,      \
     .eventfd_add = memory_listener_default_eventfd,         \
-    .eventfd_del = memory_listener_default_eventfd          \
+    .eventfd_del = memory_listener_default_eventfd,         \
+    .coalesced_mmio_add = memory_listener_default_coalesced_mmio,  \
+    .coalesced_mmio_del = memory_listener_default_coalesced_mmio   \
 
 void memory_listener_default_global(MemoryListener *listener);
 void memory_listener_default_section(MemoryListener *listener,
@@ -243,6 +249,10 @@ void memory_listener_default_section(MemoryListener *listener,
 void memory_listener_default_eventfd(MemoryListener *listener,
                                      MemoryRegionSection *section,
                                      bool match_data, uint64_t data, EventNotifier *e);
+void memory_listener_default_coalesced_mmio(MemoryListener *listener,
+                                            MemoryRegionSection *section,
+                                            target_phys_addr_t addr,
+                                            target_phys_addr_t len);
 
 /**
  * memory_region_init: Initialize a memory region
-- 
1.7.12