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gem5: Unmount the VirtIO device at the end of the run

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We explicitly unmount the VirtIO device (used to transfer files into
the simulated system) at the end of a run (when the connection is
closed) in order to make checkpointing the simulated system
easier. gem5 supports checkpointing the state of the simulation when
it is terminated, and future simulations are able to resume from this
snapshot. However, for the checkpoint to work correctly, we need to
make sure that there is no shared state between the simulated system
and the host. This mandates that we disconnect the VirtIO device prior
to taking a checkpoint.
This commit is contained in:
Sascha Bischoff
2018-06-07 13:35:50 +01:00
committed by setrofim
parent 008f96673f
commit 9e45d65c94
1 changed files with 13 additions and 0 deletions
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13
devlib/utils/ssh.py
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@@ -536,6 +536,10 @@ class Gem5Connection(TelnetConnection):
""" """
gem5_logger.info("Gracefully terminating the gem5 simulation.") gem5_logger.info("Gracefully terminating the gem5 simulation.")
try: try:
# Unmount the virtio device BEFORE we kill the
# simulation. This is done to simplify checkpointing at
# the end of a simulation!
self._unmount_virtio()
self._gem5_util("exit") self._gem5_util("exit")
self.gem5simulation.wait() self.gem5simulation.wait()
except EOF: except EOF:
@@ -793,6 +797,15 @@ class Gem5Connection(TelnetConnection):
mount_command = "mount -t 9p -o trans=virtio,version=9p2000.L,aname={} gem5 {}".format(self.gem5_interact_dir, self.gem5_input_dir) mount_command = "mount -t 9p -o trans=virtio,version=9p2000.L,aname={} gem5 {}".format(self.gem5_interact_dir, self.gem5_input_dir)
self._gem5_shell(mount_command, as_root=True) self._gem5_shell(mount_command, as_root=True)
def _unmount_virtio(self):
"""
Unmount the VirtIO device in the simulated system.
"""
gem5_logger.info("Unmounting VirtIO device in simulated system")
unmount_command = "umount {}".format(self.gem5_input_dir)
self._gem5_shell(unmount_command, as_root=True)
def _move_to_temp_dir(self, source): def _move_to_temp_dir(self, source):
""" """
Move a file to the temporary directory on the host for copying to the Move a file to the temporary directory on the host for copying to the