1. 09 Feb, 2011 1 commit
    • Joerg Roedel's avatar
      KVM: SVM: Make sure KERNEL_GS_BASE is valid when loading gs_index · 893a5ab6
      Joerg Roedel authored
      The gs_index loading code uses the swapgs instruction to
      switch to the user gs_base temporarily. This is unsave in an
      lightweight exit-path in KVM on AMD because the
      KERNEL_GS_BASE MSR is switches lazily. An NMI happening in
      the critical path of load_gs_index may use the wrong GS_BASE
      value then leading to unpredictable behavior, e.g. a
      triple-fault.
      
      This patch fixes the issue by making sure that load_gs_index
      is called only with a valid KERNEL_GS_BASE value loaded in
      KVM.
      Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
      Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
      893a5ab6
  2. 03 Feb, 2011 21 commits
  3. 01 Feb, 2011 5 commits
  4. 31 Jan, 2011 13 commits