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file_ram_alloc: unify mem-path,mem-prealloc error handling
-mem-prealloc asks to preallocate memory residing on -mem-path path. Currently QEMU exits in case: - Memory file has been created but allocation via explicit write fails. And it fallbacks to malloc in case: - Querying huge page size fails. - Lack of sync MMU support. - Open fails. - mmap fails. Have the same behaviour for all cases: fail in case -mem-path and -mem-prealloc are specified for regions where the requested size is suitable for hugepages. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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