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exec: file_ram_alloc(): print error when prealloc fails
If memory allocation fails when using the -mem-prealloc command-line option, QEMU exits without printing any error information to the user: # qemu [...] -m 1G -mem-prealloc -mem-path /dev/hugepages # echo $? 1 This commit adds an error message, so that we print instead: # qemu [...] -m 1G -mem-prealloc -mem-path /dev/hugepages qemu: unable to map backing store for hugepages: Cannot allocate memory Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> (cherry picked from commit e4d9df4) Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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