commit 4800a777667df4cc907be72d269061b6ff9d4622
author Ed Coyne <edcoyne@google.com> Mon Jun 17 22:34:12 2019 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> Mon Jun 17 22:34:12 2019 +0000
tree 022114fd5bddc139229fa93d5cde3d5e280920a5
parent eb218c76ed1a4844fb24c389f12002d01cc09e2b

[zx] Split mexec functionality out from devmgr.

Introduce new fuchsia.kernel.MexecBroker that will live in svchost,
similar to f.k.DebugBroker. It will take over responsibility for
providing the service that is used to mexec the system.

This also changes slighly how the Suspend call works for devmgr. The
suspend call will now wait until the suspend operation is done before
returning a result to the fidl caller. The mexec process now uses this
functionality to allow a caller to call the mexec syscall after all
devices are suspended instead of relying on a special case in devmgr to
do it.

Re-apply of change: I84fb42a70de039b32b71db08242701d2a66e1c53 but
includes fix of use-after-free bug.

Issue: ZX-3403 #Mexec on its own.
Test: Added unit tests and manual testing:
On astro:
1) fx set smart_display.astro --release
2) (flash astro command)
3) fx serve (paving)
4) fx reboot -r (paving more)

On vim2:
1) fx set core.vim2
2) fx serve (paving)
3) fx reboot -r (2 times to pave on new zedboot and one more for good
measure).

On eve:
1) fx set workstation.chromebook-x64
2) fx mkzedboot ...
3) fx serve (pave/mexec)

Repeat with "--variant clang"

Change-Id: I50c677ad2c8c5f34576a2722bb9a86c1d9582a97