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hostmem-file: add the 'pmem' option

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When QEMU emulates vNVDIMM labels and migrates vNVDIMM devices, it
needs to know whether the backend storage is a real persistent memory,
in order to decide whether special operations should be performed to
ensure the data persistence.

This boolean option 'pmem' allows users to specify whether the backend
storage of memory-backend-file is a real persistent memory. If
'pmem=on', QEMU will set the flag RAM_PMEM in the RAM block of the
corresponding memory region. If 'pmem' is set while lack of libpmem
support, a error is generated.

Signed-off-by: Junyan He <junyan.he@intel.com>
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Junyan He 2018-07-18 15:48:00 +08:00 • committed by Michael S. Tsirkin
parent 17824406fa
commit a4de8552b2
6 changed files with 85 additions and 2 deletions
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3
include/exec/ram_addr.h
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@ -70,6 +70,8 @@ static inline unsigned long int ramblock_recv_bitmap_offset(void *host_addr,
return host_addr_offset >> TARGET_PAGE_BITS;
}
bool ramblock_is_pmem(RAMBlock *rb);
long qemu_getrampagesize(void);
/**
@ -83,6 +85,7 @@ long qemu_getrampagesize(void);
* @ram_flags: specify the properties of the ram block, which can be one
* or bit-or of following values
* - RAM_SHARED: mmap the backing file or device with MAP_SHARED
* - RAM_PMEM: the backend @mem_path or @fd is persistent memory
* Other bits are ignored.
* @mem_path or @fd: specify the backing file or device
* @errp: pointer to Error*, to store an error if it happens