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fix(memctx): retry cold bootstrap with backoff while guest boots

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The cold address-space bootstrap (host_bootstrap -> System DTB) ran once and was
terminal: when the adapter attached before the guest finished booting, no System
process was found, the adapter emitted a single ERROR and never retried, so the
memctx datum was never published.

Make it self-healing: on bootstrap failure arm a one-shot backoff timerfd (a
second adapter fd, demuxed by cookie) that re-kicks the bootstrap until it
succeeds; reset and disarm on success. Drop the per-failure URGENT ERROR (a
still-booting guest is transient, not a fault) for a single diagnostic line on
the first failure. Add a stub fail-injection (cfg fail_boots) and test_retry.

Bump 0.3.5.
This commit is contained in:
Gregory Lirent
2026-06-24 11:20:32 +03:00
parent 6fea392d46
commit 26e5ab4709
4 changed files with 156 additions and 15 deletions
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CMakeLists.txt
+1 -1
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@@ -1,7 +1,7 @@
cmake_minimum_required(VERSION 3.16)
# Single source of truth for the version: CI passes -DVMSIG_VERSION=${TAG#v}, so the project
# version (-> libvgpu-perception SONAME/.so version) and the .deb version come from one tag.
set(VMSIG_VERSION "0.3.4" CACHE STRING "Release version (MAJOR.MINOR.PATCH); CI passes the tag")
set(VMSIG_VERSION "0.3.5" CACHE STRING "Release version (MAJOR.MINOR.PATCH); CI passes the tag")
project(vmsig VERSION ${VMSIG_VERSION} LANGUAGES C)
set(CMAKE_C_STANDARD 17)