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[Qemu-devel] [PATCH 22/66] memory: add ref/unref
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH 22/66] memory: add ref/unref |
Date: |
Thu, 4 Jul 2013 17:13:18 +0200 |
Reviewed-by: Jan Kiszka <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
include/exec/memory.h | 30 ++++++++++++++++++++++++++++++
memory.c | 14 ++++++++++++++
2 files changed, 44 insertions(+)
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 2f3e8e4..d2466a7 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -247,6 +247,36 @@ void memory_region_init(MemoryRegion *mr,
struct Object *owner,
const char *name,
uint64_t size);
+
+/**
+ * memory_region_ref: Add 1 to a memory region's reference count
+ *
+ * Whenever memory regions are accessed outside the BQL, they need to be
+ * preserved against hot-unplug. MemoryRegions actually do not have their
+ * own reference count; they piggyback on a QOM object, their "owner".
+ * This function adds a reference to the owner.
+ *
+ * All MemoryRegions must have an owner if they can disappear, even if the
+ * device they belong to operates exclusively under the BQL. This is because
+ * the region could be returned at any time by memory_region_find, and this
+ * is usually under guest control.
+ *
+ * @mr: the #MemoryRegion
+ */
+void memory_region_ref(MemoryRegion *mr);
+
+/**
+ * memory_region_unref: Remove 1 to a memory region's reference count
+ *
+ * Whenever memory regions are accessed outside the BQL, they need to be
+ * preserved against hot-unplug. MemoryRegions actually do not have their
+ * own reference count; they piggyback on a QOM object, their "owner".
+ * This function removes a reference to the owner and possibly destroys it.
+ *
+ * @mr: the #MemoryRegion
+ */
+void memory_region_unref(MemoryRegion *mr);
+
/**
* memory_region_init_io: Initialize an I/O memory region.
*
diff --git a/memory.c b/memory.c
index f85774a..e04d519 100644
--- a/memory.c
+++ b/memory.c
@@ -1019,6 +1019,20 @@ Object *memory_region_owner(MemoryRegion *mr)
return mr->owner;
}
+void memory_region_ref(MemoryRegion *mr)
+{
+ if (mr && mr->owner) {
+ object_ref(mr->owner);
+ }
+}
+
+void memory_region_unref(MemoryRegion *mr)
+{
+ if (mr && mr->owner) {
+ object_unref(mr->owner);
+ }
+}
+
uint64_t memory_region_size(MemoryRegion *mr)
{
if (int128_eq(mr->size, int128_2_64())) {
--
1.8.1.4
- [Qemu-devel] [PATCH 11/66] isa: implement isa_is_ioport_assigned via memory_region_find, (continued)
- [Qemu-devel] [PATCH 11/66] isa: implement isa_is_ioport_assigned via memory_region_find, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 12/66] vmware-vga: Accept unaligned I/O accesses, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 13/66] xen: Mark fixed platform I/O as unaligned, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 14/66] ioport: Switch dispatching to memory core layer, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 16/66] vmport: Disentangle read handler type from portio, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 15/66] ioport: Remove unused old dispatching services, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 17/66] ioport: Move portio types to ioport.h, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 19/66] memory: destroy phys_sections one by one, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 20/66] exec: simplify destruction of the phys map, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 21/66] memory: add getter for owner, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 22/66] memory: add ref/unref,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 23/66] memory: introduce memory_region_present, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 24/66] memory: add ref/unref calls, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 25/66] exec: check MRU in qemu_ram_addr_from_host, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 26/66] exec: move qemu_ram_addr_from_host_nofail to cputlb.c, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 27/66] memory: return MemoryRegion from qemu_ram_addr_from_host, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 28/66] exec: reorganize address_space_map, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 29/66] memory: ref/unref memory across address_space_map/unmap, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 30/66] escc: rename struct to ESCCState, Paolo Bonzini, 2013/07/04
- [Qemu-devel] [PATCH 31/66] vga: pass owner to vga_init, Paolo Bonzini, 2013/07/04