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memory: Introduce replay_discarded callback for RamDiscardManager

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Introduce replay_discarded callback similar to our existing
replay_populated callback, to be used my migration code to never migrate
discarded memory.

Acked-by: Peter Xu <peterx@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
David Hildenbrand 2021-10-11 19:53:38 +02:00 committed by Juan Quintela
parent b7bc6b1828
commit adaf9d92f8
2 changed files with 32 additions and 0 deletions
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21
include/exec/memory.h
View File

@ -550,6 +550,7 @@ static inline void ram_discard_listener_init(RamDiscardListener *rdl,
}
typedef int (*ReplayRamPopulate)(MemoryRegionSection *section, void *opaque);
typedef void (*ReplayRamDiscard)(MemoryRegionSection *section, void *opaque);
/*
* RamDiscardManagerClass:
@ -638,6 +639,21 @@ struct RamDiscardManagerClass {
MemoryRegionSection *section,
ReplayRamPopulate replay_fn, void *opaque);
/**
* @replay_discarded:
*
* Call the #ReplayRamDiscard callback for all discarded parts within the
* #MemoryRegionSection via the #RamDiscardManager.
*
* @rdm: the #RamDiscardManager
* @section: the #MemoryRegionSection
* @replay_fn: the #ReplayRamDiscard callback
* @opaque: pointer to forward to the callback
*/
void (*replay_discarded)(const RamDiscardManager *rdm,
MemoryRegionSection *section,
ReplayRamDiscard replay_fn, void *opaque);
/**
* @register_listener:
*
@ -682,6 +698,11 @@ int ram_discard_manager_replay_populated(const RamDiscardManager *rdm,
ReplayRamPopulate replay_fn,
void *opaque);
void ram_discard_manager_replay_discarded(const RamDiscardManager *rdm,
MemoryRegionSection *section,
ReplayRamDiscard replay_fn,
void *opaque);
void ram_discard_manager_register_listener(RamDiscardManager *rdm,
RamDiscardListener *rdl,
MemoryRegionSection *section);

11
softmmu/memory.c
View File

@ -2081,6 +2081,17 @@ int ram_discard_manager_replay_populated(const RamDiscardManager *rdm,
return rdmc->replay_populated(rdm, section, replay_fn, opaque);
}
void ram_discard_manager_replay_discarded(const RamDiscardManager *rdm,
MemoryRegionSection *section,
ReplayRamDiscard replay_fn,
void *opaque)
{
RamDiscardManagerClass *rdmc = RAM_DISCARD_MANAGER_GET_CLASS(rdm);
g_assert(rdmc->replay_discarded);
rdmc->replay_discarded(rdm, section, replay_fn, opaque);
}
void ram_discard_manager_register_listener(RamDiscardManager *rdm,
RamDiscardListener *rdl,
MemoryRegionSection *section)