44a4ff31c0
Allow RAM MemoryRegion to be created from an offset in a file, instead of allocating at offset of 0 by default. This is needed to synchronize RAM between QEMU & remote process. Signed-off-by: Jagannathan Raman <jag.raman@oracle.com> Signed-off-by: John G Johnson <john.g.johnson@oracle.com> Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 609996697ad8617e3b01df38accc5c208c24d74e.1611938319.git.jag.raman@oracle.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
#ifndef QEMU_MMAP_ALLOC_H
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#define QEMU_MMAP_ALLOC_H
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size_t qemu_fd_getpagesize(int fd);
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size_t qemu_mempath_getpagesize(const char *mem_path);
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/**
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* qemu_ram_mmap: mmap the specified file or device.
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*
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* Parameters:
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* @fd: the file or the device to mmap
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* @size: the number of bytes to be mmaped
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* @align: if not zero, specify the alignment of the starting mapping address;
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* otherwise, the alignment in use will be determined by QEMU.
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* @readonly: true for a read-only mapping, false for read/write.
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* @shared: map has RAM_SHARED flag.
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* @is_pmem: map has RAM_PMEM flag.
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* @map_offset: map starts at offset of map_offset from the start of fd
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*
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* Return:
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* On success, return a pointer to the mapped area.
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* On failure, return MAP_FAILED.
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*/
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void *qemu_ram_mmap(int fd,
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size_t size,
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size_t align,
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bool readonly,
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bool shared,
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bool is_pmem,
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off_t map_offset);
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void qemu_ram_munmap(int fd, void *ptr, size_t size);
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#endif
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