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qemu-vm: fix inconsistent caching of xchg dirs

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xchg is advertised as a bidirectional exchange dir, but file content
transfer from host to VM fails due to caching:
If a file is read in the VM and then modified on the host, subsequent
re-reads in the VM can yield old, cached data.
This is caused by the use of 9p's cache=loose mode that is explicitly
meant for read-only mounts.

9p doesn't provide any suitable cache modes, so fix this by disabling
caching.

Also, remove a now unnecessary sync in the test driver.
This commit is contained in:
Erik Arvstedt
2020-06-01 21:55:33 +02:00
parent dfa743e49e
commit d85dc4f690
4 changed files with 3 additions and 4 deletions
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nixos/modules/virtualisation/qemu-vm.nix
+1 -1
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@@ -567,7 +567,7 @@ in
"/tmp/xchg" =
{ device = "xchg";
fsType = "9p";
options = [ "trans=virtio" "version=9p2000.L" "cache=loose" ];
options = [ "trans=virtio" "version=9p2000.L" ];
neededForBoot = true;
};
"/tmp/shared" =