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memory: add memory_region_flush_rom_device()

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ROM devices go via MemoryRegionOps->write() callbacks for write
operations and do not dirty/invalidate that memory.  Device emulation
must be able to mark memory ranges that have been modified internally
(e.g. using memory_region_get_ram_ptr()).

Introduce the memory_region_flush_rom_device() API for this purpose.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20190123212234.32068-2-stefanha@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: fix block comment style]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Stefan Hajnoczi 2019-01-29 11:46:04 +00:00 • committed by Peter Maydell
parent bf8d09694c
commit 047be4ed24
2 changed files with 31 additions and 0 deletions
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18
include/exec/memory.h
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@ -1344,6 +1344,24 @@ bool memory_region_snapshot_get_dirty(MemoryRegion *mr,
void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
hwaddr size, unsigned client);
/**
* memory_region_flush_rom_device: Mark a range of pages dirty and invalidate
* TBs (for self-modifying code).
*
* The MemoryRegionOps->write() callback of a ROM device must use this function
* to mark byte ranges that have been modified internally, such as by directly
* accessing the memory returned by memory_region_get_ram_ptr().
*
* This function marks the range dirty and invalidates TBs so that TCG can
* detect self-modifying code.
*
* @mr: the region being flushed.
* @addr: the start, relative to the start of the region, of the range being
* flushed.
* @size: the size, in bytes, of the range being flushed.
*/
void memory_region_flush_rom_device(MemoryRegion *mr, hwaddr addr, hwaddr size);
/**
* memory_region_set_readonly: Turn a memory region read-only (or read-write)
*