1. 06 Jun, 2009 1 commit
    • Mark Langsdorf's avatar
      x86: enable GART-IOMMU only after setting up protection methods · fe2245c9
      Mark Langsdorf authored
      The current code to set up the GART as an IOMMU enables GART
      translations before it removes the aperture from the kernel memory
      map, sets the GART PTEs to UC, sets up the guard and scratch
      pages, or does a wbinvd().  This leaves the possibility of cache
      aliasing open and can cause system crashes.
      
      Re-order the code so as to enable the GART translations only
      after all safeguards are in place and the tlb has been flushed.
      
      AMD has tested this patch on both Istanbul systems and 1st
      generation Opteron systems with APG enabled and seen no adverse
      effects.  Istanbul systems with HT Assist enabled sometimes
      see MCE errors due to cache artifacts with the unmodified
      code.
      Signed-off-by: default avatarMark Langsdorf <mark.langsdorf@amd.com>
      Cc: <stable@kernel.org>
      Cc: Joerg Roedel <joerg.roedel@amd.com>
      Cc: akpm@linux-foundation.org
      Cc: jbarnes@virtuousgeek.org
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      fe2245c9
  2. 28 May, 2009 33 commits
  3. 11 May, 2009 1 commit
  4. 09 May, 2009 2 commits
  5. 08 May, 2009 3 commits