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softmmu/physmem: Extend ram_block_discard_(require|disable) by two discard types

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We want to separate the two cases whereby we discard ram
- uncoordinated: e.g., virito-balloon
- coordinated: e.g., virtio-mem coordinated via the RamDiscardManager

Reviewed-by: Pankaj Gupta <pankaj.gupta@cloud.ionos.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Auger Eric <eric.auger@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: teawater <teawaterz@linux.alibaba.com>
Cc: Marek Kedzierski <mkedzier@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210413095531.25603-12-david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
David Hildenbrand 2021-04-13 11:55:29 +02:00 • committed by Eduardo Habkost
parent 98da491dff
commit 7e6d32ebf7
2 changed files with 66 additions and 10 deletions
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18
include/exec/memory.h
View file

@ -2893,6 +2893,12 @@ static inline MemOp devend_memop(enum device_endian end)
*/
int ram_block_discard_disable(bool state);
/*
* See ram_block_discard_disable(): only disable uncoordinated discards,
* keeping coordinated discards (via the RamDiscardManager) enabled.
*/
int ram_block_uncoordinated_discard_disable(bool state);
/*
* Inhibit technologies that disable discarding of pages in RAM blocks.
*
@ -2902,12 +2908,20 @@ int ram_block_discard_disable(bool state);
int ram_block_discard_require(bool state);
/*
* Test if discarding of memory in ram blocks is disabled.
* See ram_block_discard_require(): only inhibit technologies that disable
* uncoordinated discarding of pages in RAM blocks, allowing co-existance with
* technologies that only inhibit uncoordinated discards (via the
* RamDiscardManager).
*/
int ram_block_coordinated_discard_require(bool state);
/*
* Test if any discarding of memory in ram blocks is disabled.
*/
bool ram_block_discard_is_disabled(void);
/*
* Test if discarding of memory in ram blocks is required to work reliably.
* Test if any discarding of memory in ram blocks is required to work reliably.
*/
bool ram_block_discard_is_required(void);