Fixed page tracking and somewhat working single step probe

1 files changed, 26 insertions, 0 deletions

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+Observations:
+- some times get extra faults with race condition.. think there is
+  a race cond with track_page and something is untracking the pages again
+- on
+
+Questions:
+- test/sevstep: why 0 then 15, arent both accesses in the first page?
+	=> first code page and stack access
+- test/sevstep: why does it seem to work with event race but not without?
+	=> it doesnt (anymore)
+
+Tried:
+- try invalidating tlbs (no effect, prob was already)
+
+Next steps:
+- enable single-steping with multiple page faults (only one ends up in
+  last_fault_gfn and others stay untracked)
+- try adjusting timer for single stepping
+- Try to setup the non-baseline step without apic, but remapping page
+  such that we see the relevant page faults and the gfn increment
+- need to not retrack, allow the page to get remapped
+  (return false from sevstep_uspt_track.. caller) and enable single_step,
+  THEN when interrupt hits retrack the page
+- test/sevstep: implement counter.. read program memory to see
+  how many instructions were executed on apic timer
+- add warning for high values in baseline