1. 08 3月, 2009 1 次提交
  2. 07 3月, 2009 1 次提交
  3. 04 3月, 2009 12 次提交
  4. 03 3月, 2009 24 次提交
  5. 02 3月, 2009 2 次提交
    • P
      x86 mmiotrace: fix race with release_kmmio_fault_page() · 340430c5
      Pekka Paalanen 提交于
      There was a theoretical possibility to a race between arming a page in
      post_kmmio_handler() and disarming the page in
      release_kmmio_fault_page():
      
      cpu0                             cpu1
      ------------------------------------------------------------------
      mmiotrace shutdown
      enter release_kmmio_fault_page
                                       fault on the page
                                       disarm the page
      disarm the page
                                       handle the MMIO access
                                       re-arm the page
      put the page on release list
      remove_kmmio_fault_pages()
                                       fault on the page
                                       page not known to mmiotrace
                                       fall back to do_page_fault()
                                       *KABOOM*
      
      (This scenario also shows the double disarm case which is allowed.)
      
      Fixed by acquiring kmmio_lock in post_kmmio_handler() and checking
      if the page is being released from mmiotrace.
      Signed-off-by: NPekka Paalanen <pq@iki.fi>
      Cc: Stuart Bennett <stuart@freedesktop.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      340430c5
    • S
      x86 mmiotrace: improve handling of secondary faults · 3e39aa15
      Stuart Bennett 提交于
      Upgrade some kmmio.c debug messages to warnings.
      Allow secondary faults on probed pages to fall through, and only log
      secondary faults that are not due to non-present pages.
      
      Patch edited by Pekka Paalanen.
      Signed-off-by: NStuart Bennett <stuart@freedesktop.org>
      Signed-off-by: NPekka Paalanen <pq@iki.fi>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Signed-off-by: NIngo Molnar <mingo@elte.hu>
      3e39aa15