[MirageOS-devel] How to support a larger disk with hvt + kv_ro=direct (pass-through)?

[Hiroshi Doyu <hiroshi.doyu@xxxxxxxxxxxx>]

Hello,

Configured unix+kv_ro=direct, it seems to read a file from disk dynamically[1].
But hvt+kv_ro=direct seems to use a ramdisk(crunch?) statically[2].

How can hvt do the similar pass-through to a file as "unix+kv_ro=direct"?

[1]
$ mirage configure -t unix --kv_ro=direct && make depend && make
$ ./kv_ro 
2019-03-26 16:31:28 +00:00: INF [application] foo
$ echo -n "hello" > t/secret 
$ ./kv_ro 
2019-03-26 16:32:15 +00:00: INF [application] hello

[2]
$ mirage configure -t hvt --kv_ro=direct && make depend && make
$ sudo ./solo5-hvt kv_ro.hvt 
2019-03-26 16:34:19 -00:00: INF [application] foo
$ echo -n "hello" > t/secret 
$ sudo ./solo5-hvt kv_ro.hvt 
2019-03-26 16:35:11 -00:00: INF [application] foo

the above code change for skelton/device-usage/kv_ro:
https://github.com/ehirdoy/mirage-skeleton/commit/bff6688e075ffec67723d5663a984263bffa8563
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