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memory: learn about non-volatile memory region

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Add a new flag to mark memory region that are used as non-volatile, by
NVDIMM for example. That bit is propagated down to the flat view, and
reflected in HMP info mtree with a "nv-" prefix on the memory type.

This way, guest_phys_blocks_region_add() can skip the NV memory
regions for dumps and TCG memory clear in a following patch.

Cc: dgilbert@redhat.com
Cc: imammedo@redhat.com
Cc: pbonzini@redhat.com
Cc: guangrong.xiao@linux.intel.com
Cc: mst@redhat.com
Cc: xiaoguangrong.eric@gmail.com
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20181003114454.5662-2-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Marc-André Lureau 2018-10-03 15:44:52 +04:00 • committed by Paolo Bonzini
parent 1a1435dd61
commit c26763f8ec
3 changed files with 61 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

25
include/exec/memory.h
View file

@ -355,6 +355,7 @@ struct MemoryRegion {
bool ram;
bool subpage;
bool readonly; /* For RAM regions */
bool nonvolatile;
bool rom_device;
bool flush_coalesced_mmio;
bool global_locking;
@ -480,6 +481,7 @@ static inline FlatView *address_space_to_flatview(AddressSpace *as)
* @offset_within_address_space: the address of the first byte of the section
* relative to the region's address space
* @readonly: writes to this section are ignored
* @nonvolatile: this section is non-volatile
*/
struct MemoryRegionSection {
MemoryRegion *mr;
@ -488,6 +490,7 @@ struct MemoryRegionSection {
Int128 size;
hwaddr offset_within_address_space;
bool readonly;
bool nonvolatile;
};
/**
@ -1170,6 +1173,17 @@ static inline bool memory_region_is_rom(MemoryRegion *mr)
return mr->ram && mr->readonly;
}
/**
* memory_region_is_nonvolatile: check whether a memory region is non-volatile
*
* Returns %true is a memory region is non-volatile memory.
*
* @mr: the memory region being queried
*/
static inline bool memory_region_is_nonvolatile(MemoryRegion *mr)
{
return mr->nonvolatile;
}
/**
* memory_region_get_fd: Get a file descriptor backing a RAM memory region.
@ -1341,6 +1355,17 @@ void memory_region_reset_dirty(MemoryRegion *mr, hwaddr addr,
*/
void memory_region_set_readonly(MemoryRegion *mr, bool readonly);
/**
* memory_region_set_nonvolatile: Turn a memory region non-volatile
*
* Allows a memory region to be marked as non-volatile.
* only useful on RAM regions.
*
* @mr: the region being updated.
* @nonvolatile: whether rhe region is to be non-volatile.
*/
void memory_region_set_nonvolatile(MemoryRegion *mr, bool nonvolatile);
/**
* memory_region_rom_device_set_romd: enable/disable ROMD mode
*