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+boot: 0.903
+graphic: 0.873
+instruction: 0.844
+device: 0.787
+other: 0.702
+semantic: 0.614
+vnc: 0.427
+KVM: 0.389
+mistranslation: 0.316
+network: 0.289
+socket: 0.267
+assembly: 0.099
+
+BUG: Segmentation fault when -object memory-backend-file use readonly=on, prealloc=on together
+Description of problem:
+Segmentation Fault while booting VM.
+Steps to reproduce:
+1. set qemu boot params to `-object memory-backend-file,id=mem1,readonly=on,prealloc=on,mem-path=<any-img-file>,size=4G`
+2.
+3.
+Additional information:
+It might not be a bug, probably a feature.
+The reason of this segfault is:
+readonly would mmap the backend file using PROT_READ, make it readonly,
+but the prealloc=on would touch_pages the memory mmaped by the file.
+SO the segfault happens.
+
+But there is no docs about this segfault condition (the readonly and prealloc cannot be used together.)
+
+And maybe there is a way to solve this problem, I think.
+Use mmap the memory backend file to PROT_READ|PROT_WRITE at the beginnning, after touch_pages, then mprotect the memory.
+change the prot to readonly if required.