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This change tries to improve the performance of a plugin-based VM
by adding a hint API that allows crosvm to proactively push cpu
state to the plugin when certain ports for hypercalls are accessed
by the VM.
BUG=None
TEST=build and run. See performance increase significantly.
Change-Id: I71af24ebc034095ffea42eedb9ffda0afc719cd6
Signed-off-by: Matt Delco <delco@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/1873005
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Zach Reizner <zachr@chromium.org>
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