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9p works

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Ciro Santilli 六四事件 法轮功
2020-09-17 03:00:02 +00:00
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@@ -5425,18 +5425,67 @@ Bibliography:
==== 9P gem5
TODO seems possible! Lets do it:
Is possible on aarch64 as shown at: https://gem5-review.googlesource.com/c/public/gem5/+/22831[], and it is just a matter of exposing to X86 for those that want it.
* http://gem5.org/wiki/images/b/b8/Summit2017_wa_devlib.pdf
* http://gem5.org/WA-gem5
Enable it by passing the `--vio-9p` option on the fs.py gem5 command line:
From the source, there is just one exported tag named `gem5`, so we could try on the guest:
....
./run --arch aarch64 --emulator gem5 -- --vio-9p
....
Then on the guest:
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mkdir -p /mnt/9p/gem5
mount -t 9p -o trans=virtio,version=9p2000.L gem5 /mnt/9p/data
mount -t 9p -o trans=virtio,version=9p2000.L,aname=/path/to/linux-kernel-module-cheat/out/run/gem5/aarch64/0/m5out/9p/share gem5 /mnt/9p/gem5
echo asdf > /mnt/9p/gem5/qwer
....
Yes, you have to pass the full path to the directory on the host. Yes, this is horrible.
The shared directory is:
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out/run/gem5/aarch64/0/m5out/9p/share
....
so we can observe the file the guest wrote from the host with:
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out/run/gem5/aarch64/0/m5out/9p/share/qwer
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and vice versa:
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echo zxvc > out/run/gem5/aarch64/0/m5out/9p/share/qwer
....
is now visible from the guest:
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cat /mnt/9p/gem5/qwer
....
Checkpoint restore with an open mount will likely fail because gem5 uses an ugly external executable to implement diod. The protocol is not very complex, and QEMU implements it in-tree, which is what gem5 should do as well at some point.
Also checkpoint without `--vio-9p` and restore with `--vio-9p` did not work either, the mount fails.
However, this did work, on guest:
....
unmount /mnt/9p/gem5
m5 checkpoint
....
then restore with the detalied CPU of interest e.g.
....
./run --arch aarch64 --emulator gem5 -- --vio-9p --cpu-type DerivO3CPU --caches
....
Tested on gem5 b2847f43c91e27f43bd4ac08abd528efcf00f2fd, LKMC 52a5fdd7c1d6eadc5900fc76e128995d4849aada.
==== NFS
TODO: get working.