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WIP: qemu: randomly choose vsock port on the host side #313

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WIP: qemu: randomly choose vsock port on the host side #313

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c34e44e
WIP: qemu: randomly choose vsock port on the host side
vikanezrimaya Dec 13, 2024
d364fdc
QEMU: use a static offset to choose vsock port on the host side
vikanezrimaya Dec 24, 2024
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9 changes: 7 additions & 2 deletions lib/runners/qemu.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -147,6 +147,7 @@ let
else "";

supportsNotifySocket = vsock.cid != null;
vsockHostPortOffset = 600000;

in
lib.warnIf (mem == 2048) ''
Expand All @@ -160,9 +161,13 @@ lib.warnIf (mem == 2048) ''
preStart = ''
${microvmConfig.preStart}
'' + lib.optionalString supportsNotifySocket ''
# Clean up temporary files.
${pkgs.coreutils}/bin/rm -f ./socat.log ./notify_socket.cred
# Default value: for running without systemd.
NOTIFY_VSOCK_PORT=${toString (vsockHostPortOffset + vsock.cid)}
# Start socat to forward systemd notify socket over vsock
if [ -n "''${NOTIFY_SOCKET-}" ]; then
${pkgs.socat}/bin/socat VSOCK-LISTEN:8888,fork UNIX-SENDTO:$NOTIFY_SOCKET &
${pkgs.socat}/bin/socat -d -d VSOCK-LISTEN:$NOTIFY_VSOCK_PORT,fork UNIX-SENDTO:$NOTIFY_SOCKET 2> ./socat.log &
fi
'';

Expand Down Expand Up @@ -314,7 +319,7 @@ lib.warnIf (mem == 2048) ''
# tried, SMBIOS Type 11 entries simply don't work. It looks like it might
# be broken on QEMU side. Why? I don't know.
"-fw_cfg"
"name=opt/io.systemd.credentials/vmm.notify_socket,string=vsock-stream:2:8888"
"name=opt/io.systemd.credentials/vmm.notify_socket,string=vsock-stream:2:${toString (vsockHostPortOffset + vsock.cid)}"
]
++
extraArgs
Expand Down
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