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memory: differentiate memory_region_is_logging and memory_region_get_dirty_log_mask

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For now memory regions only track DIRTY_MEMORY_VGA individually, but
this will change soon.  To support this, split memory_region_is_logging
in two functions: one that returns a given bit from dirty_log_mask,
and one that returns the entire mask.  memory_region_is_logging gets an
extra parameter so that the compiler flags misuse.

While VGA-specific users (including the Xen listener!) will want to keep
checking that bit, KVM and vhost check for "any bit except migration"
(because migration is handled via the global start/stop listener
callbacks).

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-03-23 10:50:57 +01:00
parent 5299c0f2cf
commit 2d1a35bef0
7 changed files with 27 additions and 8 deletions
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16
include/exec/memory.h
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@ -591,11 +591,23 @@ const char *memory_region_name(const MemoryRegion *mr);
/**
* memory_region_is_logging: return whether a memory region is logging writes
*
* Returns %true if the memory region is logging writes
* Returns %true if the memory region is logging writes for the given client
*
* @mr: the memory region being queried
* @client: the client being queried
*/
bool memory_region_is_logging(MemoryRegion *mr, uint8_t client);
/**
* memory_region_get_dirty_log_mask: return the clients for which a
* memory region is logging writes.
*
* Returns a bitmap of clients, which right now will be either 0 or
* (1 << DIRTY_MEMORY_VGA).
*
* @mr: the memory region being queried
*/
bool memory_region_is_logging(MemoryRegion *mr);
uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr);
/**
* memory_region_is_rom: check whether a memory region is ROM