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Diffstat (limited to 'qemu-options.hx')
| -rw-r--r-- | qemu-options.hx | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index 8ce427da78..265cf9fa38 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -4024,6 +4024,28 @@ Memory backend objects offer more control than the @option{-m} option that is traditionally used to define guest RAM. Please refer to @option{memory-backend-file} for a description of the options. +@item -object memory-backend-memfd,id=@var{id},merge=@var{on|off},dump=@var{on|off},prealloc=@var{on|off},size=@var{size},host-nodes=@var{host-nodes},policy=@var{default|preferred|bind|interleave},seal=@var{on|off},hugetlb=@var{on|off},hugetlbsize=@var{size} + +Creates an anonymous memory file backend object, which allows QEMU to +share the memory with an external process (e.g. when using +vhost-user). The memory is allocated with memfd and optional +sealing. (Linux only) + +The @option{seal} option creates a sealed-file, that will block +further resizing the memory ('on' by default). + +The @option{hugetlb} option specify the file to be created resides in +the hugetlbfs filesystem (since Linux 4.14). Used in conjunction with +the @option{hugetlb} option, the @option{hugetlbsize} option specify +the hugetlb page size on systems that support multiple hugetlb page +sizes (it must be a power of 2 value supported by the system). + +In some versions of Linux, the @option{hugetlb} option is incompatible +with the @option{seal} option (requires at least Linux 4.16). + +Please refer to @option{memory-backend-file} for a description of the +other options. + @item -object rng-random,id=@var{id},filename=@var{/dev/random} Creates a random number generator backend which obtains entropy from |