Fail* directories reorganized, Code-cleanup (-> coding-style), Typos+comments fixed.

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1321 8c4709b5-6ec9-48aa-a5cd-a96041d1645a

simulators/bochs/plex86/TODO

@@ -0,0 +1,80 @@
+Main monitor loop should compare cycles burned thus far vs
+  cycles requested, so it doesn't keep bopping back and forth
+  between host-kernel and monitor spaces without returning to
+  user space.
+
+Fix monPrint and friends.
+monpanic breaks up into 2 monprints which hit user space twice.
+
+Could put the GDT/LDT in linear memory where the guest
+  expects them.
+
+Synchronize page writes with iCache in bochs.
+
+Deal with cycle counts of guest execution in VM, and in
+  bochs/plex86 shim.
+
+Deal with page_usage.  How do we update this between timeslices?
+  Do we always clear it?  Maybe we should keep a log of things to
+  clear (page_usage, GDT entries, PDE entries, ...) and clear those
+  before returning to user space.
+
+GDT entries for guest need to be cleared upon return from guest
+  execution, or just cleared before invocation of the guest.
+
+Task segment must be a 32-bit'er.
+
+Save/restore floating point state of host/VM.
+
+deduct off some cycles for the IRET/int sequence.
+
+Conditions for bochs compile using plex86:
+  - Not compiled for debug
+  - x86 host
+  - Not PCI supported (for now).
+
+paging-mon.c:  We can eliminate any code other than CPL==3.
+
+Fix extra PDBR reload in nexus.S
+
+Manipulation/reading of host page tables needs to be SMP/preempt
+  compatible.  Need to do spin-lock (big kernel lock for old Linux)
+  on vma.
+
+==================== From previous plex86 TODO file ====================
+
+  This is a list of the major tasks/achievements/milestones yet to-do.
+  We should keep this list prioritized, creating sort of a road map.
+  Hopefully, this will reduce duplicate suggestions on the developers
+  channels, and let people know where we are in the development process.
+  Entries listed first have highest priority.
+
+  <NEAR-TERM>
+  - Fix plex86 on Linux 2.4.x/SMP or with 1P and LAPIC enabled.
+
+  - Save FPU state on host <--> monitor context switch.
+
+  - Special guest-specific drivers and special emulated pseudo-devices
+    for faster graphics/network/disk access.
+
+  - Allow some of the inactive guest pages be host swappable.
+    Currently, all pages are locked down.
+
+  - Many performance enhancements (see PERFORMANCE)
+
+  - Allow memory to be mapped anywhere in the physical address
+    space.
+
+  - Allow certain guest pages to be swap eligible by the host.
+    This means they will have to be unavailable by the guest
+    during that time.  Need a dynamic algorith for this.
+
+  - Test on 2.4 with SMP/APIC enabled on single processor machine.
+
+  - Deal with guest use of TF.
+
+  - Deal with LDT
+
+
+unallocVmPages/unreserve_guest_pages called twice,
+  release & teardown.