fix qemu exit on memory hotplug when allocation fails at prealloc time
When adding hostmem backend at runtime, QEMU might exit with error: "os_mem_prealloc: Insufficient free host memory pages available to allocate guest RAM" It happens due to os_mem_prealloc() not handling errors gracefully. Fix it by passing errp argument so that os_mem_prealloc() could report error to callers and undo performed allocation when os_mem_prealloc() fails. Signed-off-by: NIgor Mammedov <imammedo@redhat.com> Message-Id: <1469008443-72059-1-git-send-email-imammedo@redhat.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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