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From: Nathan Whitehorn <nwhitehorn@FreeBSD.org>
Date: Sat, 20 Mar 2010 15:19:57 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/powerpc/aim mmu_oea64.c src/sys/powerpc/include
 pte.h
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nwhitehorn    2010-03-20 15:19:57 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/powerpc/aim      mmu_oea64.c 
    sys/powerpc/include  pte.h 
  Log:
  SVN rev 205379 on 2010-03-20 15:19:57Z by nwhitehorn
  
  MFC r204268:
  
  Close a race involving the OEA64 scratchpage. When the scratch page's
  physical address is changed, there is a brief window during which its PTE
  is invalid. Since moea64_set_scratchpage_pa() does not and cannot hold
  the page table lock, it was possible for another CPU to insert a new PTE
  into the scratch page's PTEG slot during this interval, corrupting both
  mappings.
  
  Solve this by creating a new flag, LPTE_LOCKED, such that
  moea64_pte_insert will avoid claiming locked PTEG slots even if they
  are invalid. This change also incorporates some additional paranoia
  added to solve things I thought might be this bug.
  
  Reported by:    linimon
  
  Revision  Changes    Path
  1.4.2.9   +14 -10    src/sys/powerpc/aim/mmu_oea64.c
  1.9.2.2   +1 -0      src/sys/powerpc/include/pte.h