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memory: introduce memory_region_set_enabled()

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This allows users to disable a memory region without removing
it from the hierarchy, simplifying the implementation of
memory routers.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2011-09-14 11:54:58 +03:00
parent f44336c594
commit 6bba19ba4e
2 changed files with 46 additions and 11 deletions
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17
memory.h
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@ -123,6 +123,7 @@ struct MemoryRegion {
bool terminates;
bool readable;
bool readonly; /* For RAM regions */
bool enabled;
MemoryRegion *alias;
target_phys_addr_t alias_offset;
unsigned priority;
@ -501,6 +502,22 @@ void memory_region_add_subregion_overlap(MemoryRegion *mr,
void memory_region_del_subregion(MemoryRegion *mr,
MemoryRegion *subregion);
/*
* memory_region_set_enabled: dynamically enable or disable a region
*
* Enables or disables a memory region. A disabled memory region
* ignores all accesses to itself and its subregions. It does not
* obscure sibling subregions with lower priority - it simply behaves as
* if it was removed from the hierarchy.
*
* Regions default to being enabled.
*
* @mr: the region to be updated
* @enabled: whether to enable or disable the region
*/
void memory_region_set_enabled(MemoryRegion *mr, bool enabled);
/* Start a transaction; changes will be accumulated and made visible only
* when the transaction ends.
*/