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Memory: Enable writeback for given memory region

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Add an option to trigger memory writeback to sync given memory region
with the corresponding backing store, case one is available.
This extends the support for persistent memory, allowing syncing on-demand.

Signed-off-by: Beata Michalska <beata.michalska@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20191121000843.24844-3-beata.michalska@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Beata Michalska 2019-11-21 00:08:41 +00:00 • committed by Peter Maydell
parent 9e70492b43
commit 61c490e25e
6 changed files with 101 additions and 0 deletions
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6
include/exec/memory.h
View file

@ -1265,6 +1265,12 @@ void *memory_region_get_ram_ptr(MemoryRegion *mr);
*/
void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize,
Error **errp);
/**
* memory_region_do_writeback: Trigger writeback for selected address range
* [addr, addr + size]
*
*/
void memory_region_do_writeback(MemoryRegion *mr, hwaddr addr, hwaddr size);
/**
* memory_region_set_log: Turn dirty logging on or off for a region.

8
include/exec/ram_addr.h
View file

@ -174,6 +174,14 @@ void qemu_ram_free(RAMBlock *block);
int qemu_ram_resize(RAMBlock *block, ram_addr_t newsize, Error **errp);
void qemu_ram_writeback(RAMBlock *block, ram_addr_t start, ram_addr_t length);
/* Clear whole block of mem */
static inline void qemu_ram_block_writeback(RAMBlock *block)
{
qemu_ram_writeback(block, 0, block->used_length);
}
#define DIRTY_CLIENTS_ALL ((1 << DIRTY_MEMORY_NUM) - 1)
#define DIRTY_CLIENTS_NOCODE (DIRTY_CLIENTS_ALL & ~(1 << DIRTY_MEMORY_CODE))