Shintaro Kawamura f8dcf7528d swap: fix deadlock on the vmm-swap enable operation ... The deadlock could happen on this scenario: 1. User enables vmm-swap. The main process sends Command::Enable to the monitor process. 2. User request the current status at the same time. The main process sends Command::Status to the monitor process and wait for the response from the monitor process. 3. The monitor process start enabling vmm-swap. Sends VmSwapCommand::Suspend to the main process and wait for VmSwapResponse::SuspendCompleted. 4. The main process is blocked by the step 2 and the request from step 3 is never consumed. The root issue issue is that Command::Status can be inserted between Command::Enable and VmSwapCommand::Suspend. This CL simplifies the communication between the main and monitor processes on enabling vmm-swap and resolve the deadlock. VmSwapCommand and corresponding Tube was added by https://crrev.com/c/4293656, but is now removed by this CL. BUG=b:275671628 TEST=manual test Change-Id: Ia838b1feddb4a3f41bd729e9147adc5e2df866aa Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/4387662 Reviewed-by: David Stevens <stevensd@chromium.org> Commit-Queue: Shin Kawamura <kawasin@google.com>		2023-04-03 06:03:18 +00:00
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src	swap: fix deadlock on the vmm-swap enable operation	2023-04-03 06:03:18 +00:00
tests
Cargo.toml