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memory: add API for observing updates to the physical memory map

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Add an API that allows a client to observe changes in the global
memory map:
 - region added (possibly with logging enabled)
 - region removed (possibly with logging enabled)
 - logging started on a region
 - logging stopped on a region
 - global logging started
 - global logging removed

This API will eventually replace cpu_register_physical_memory_client().

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2011-12-11 14:47:25 +02:00
parent 86e775c654
commit 7664e80c84
3 changed files with 145 additions and 0 deletions
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47
memory.h
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@ -154,6 +154,7 @@ typedef struct MemoryRegionSection MemoryRegionSection;
* MemoryRegionSection: describes a fragment of a #MemoryRegion
*
* @mr: the region, or %NULL if empty
* @address_space: the address space the region is mapped in
* @offset_within_region: the beginning of the section, relative to @mr's start
* @size: the size of the section; will not exceed @mr's boundaries
* @offset_within_address_space: the address of the first byte of the section
@ -161,11 +162,31 @@ typedef struct MemoryRegionSection MemoryRegionSection;
*/
struct MemoryRegionSection {
MemoryRegion *mr;
MemoryRegion *address_space;
target_phys_addr_t offset_within_region;
uint64_t size;
target_phys_addr_t offset_within_address_space;
};
typedef struct MemoryListener MemoryListener;
/**
* MemoryListener: callbacks structure for updates to the physical memory map
*
* Allows a component to adjust to changes in the guest-visible memory map.
* Use with memory_listener_register() and memory_listener_unregister().
*/
struct MemoryListener {
void (*region_add)(MemoryListener *listener, MemoryRegionSection *section);
void (*region_del)(MemoryListener *listener, MemoryRegionSection *section);
void (*log_start)(MemoryListener *listener, MemoryRegionSection *section);
void (*log_stop)(MemoryListener *listener, MemoryRegionSection *section);
void (*log_sync)(MemoryListener *listener, MemoryRegionSection *section);
void (*log_global_start)(MemoryListener *listener);
void (*log_global_stop)(MemoryListener *listener);
QLIST_ENTRY(MemoryListener) link;
};
/**
* memory_region_init: Initialize a memory region
*
@ -631,6 +652,32 @@ void memory_region_transaction_begin(void);
*/
void memory_region_transaction_commit(void);
/**
* memory_listener_register: register callbacks to be called when memory
* sections are mapped or unmapped into an address
* space
*
* @listener: an object containing the callbacks to be called
*/
void memory_listener_register(MemoryListener *listener);
/**
* memory_listener_unregister: undo the effect of memory_listener_register()
*
* @listener: an object containing the callbacks to be removed
*/
void memory_listener_unregister(MemoryListener *listener);
/**
* memory_global_dirty_log_start: begin dirty logging for all regions
*/
void memory_global_dirty_log_start(void);
/**
* memory_global_dirty_log_stop: begin dirty logging for all regions
*/
void memory_global_dirty_log_stop(void);
void mtree_info(fprintf_function mon_printf, void *f);
#endif