1. 20 3月, 2011 2 次提交
    • S
      xen: update mask_rw_pte after kernel page tables init changes · d8aa5ec3
      Stefano Stabellini 提交于
      After "x86-64, mm: Put early page table high" already existing kernel
      page table pages can be mapped using early_ioremap too so we need to
      update mask_rw_pte to make sure these pages are still mapped RO.
      The reason why we have to do that is explain by the commit message of
      fef5ba79:
      
      "Xen requires that all pages containing pagetable entries to be mapped
      read-only.  If pages used for the initial pagetable are already mapped
      then we can change the mapping to RO.  However, if they are initially
      unmapped, we need to make sure that when they are later mapped, they
      are also mapped RO.
      
      ..SNIP..
      
      the pagetable setup code early_ioremaps the pages to write their
      entries, so we must make sure that mappings created in the early_ioremap
      fixmap area are mapped RW.  (Those mappings are removed before the pages
      are presented to Xen as pagetable pages.)"
      
      We accomplish all this in mask_rw_pte by mapping RO all the pages mapped
      using early_ioremap apart from the last one that has been allocated
      because it is not a page table page yet (it has not been hooked into the
      page tables yet).
      Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
      Acked-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop>
      Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      d8aa5ec3
    • S
      xen: set max_pfn_mapped to the last pfn mapped · 14988a4d
      Stefano Stabellini 提交于
      Do not set max_pfn_mapped to the end of the initial memory mappings,
      that also contain pages that don't belong in pfn space (like the mfn
      list).
      
      Set max_pfn_mapped to the last real pfn mapped in the initial memory
      mappings that is the pfn backing _end.
      Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>
      Acked-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop>
      Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
      14988a4d
  2. 18 3月, 2011 1 次提交
  3. 14 3月, 2011 3 次提交
  4. 10 3月, 2011 1 次提交
  5. 04 3月, 2011 1 次提交
    • K
      xen: Mark all initial reserved pages for the balloon as INVALID_P2M_ENTRY. · 6eaa412f
      Konrad Rzeszutek Wilk 提交于
      With this patch, we diligently set regions that will be used by the
      balloon driver to be INVALID_P2M_ENTRY and under the ownership
      of the balloon driver. We are OK using the __set_phys_to_machine
      as we do not expect to be allocating any P2M middle or entries pages.
      The set_phys_to_machine has the side-effect of potentially allocating
      new pages and we do not want that at this stage.
      
      We can do this because xen_build_mfn_list_list will have already
      allocated all such pages up to xen_max_p2m_pfn.
      
      We also move the check for auto translated physmap down the
      stack so it is present in __set_phys_to_machine.
      
      [v2: Rebased with mmu->p2m code split]
      Reviewed-by: NIan Campbell <ian.campbell@citrix.com>
      Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      6eaa412f
  6. 24 2月, 2011 1 次提交
    • Y
      x86: Rename e820_table_* to pgt_buf_* · d1b19426
      Yinghai Lu 提交于
      e820_table_{start|end|top}, which are used to buffer page table
      allocation during early boot, are now derived from memblock and don't
      have much to do with e820.  Change the names so that they reflect what
      they're used for.
      
      This patch doesn't introduce any behavior change.
      
      -v2: Ingo found that earlier patch "x86: Use early pre-allocated page
           table buffer top-down" caused crash on 32bit and needed to be
           dropped.  This patch was updated to reflect the change.
      
      -tj: Updated commit description.
      Signed-off-by: NYinghai Lu <yinghai@kernel.org>
      Signed-off-by: NTejun Heo <tj@kernel.org>
      d1b19426
  7. 15 1月, 2011 1 次提交
  8. 12 1月, 2011 1 次提交
  9. 03 12月, 2010 1 次提交
    • J
      vmalloc: eagerly clear ptes on vunmap · 64141da5
      Jeremy Fitzhardinge 提交于
      On stock 2.6.37-rc4, running:
      
        # mount lilith:/export /mnt/lilith
        # find  /mnt/lilith/ -type f -print0 | xargs -0 file
      
      crashes the machine fairly quickly under Xen.  Often it results in oops
      messages, but the couple of times I tried just now, it just hung quietly
      and made Xen print some rude messages:
      
          (XEN) mm.c:2389:d80 Bad type (saw 7400000000000001 != exp
          3000000000000000) for mfn 1d7058 (pfn 18fa7)
          (XEN) mm.c:964:d80 Attempt to create linear p.t. with write perms
          (XEN) mm.c:2389:d80 Bad type (saw 7400000000000010 != exp
          1000000000000000) for mfn 1d2e04 (pfn 1d1fb)
          (XEN) mm.c:2965:d80 Error while pinning mfn 1d2e04
      
      Which means the domain tried to map a pagetable page RW, which would
      allow it to map arbitrary memory, so Xen stopped it.  This is because
      vm_unmap_ram() left some pages mapped in the vmalloc area after NFS had
      finished with them, and those pages got recycled as pagetable pages
      while still having these RW aliases.
      
      Removing those mappings immediately removes the Xen-visible aliases, and
      so it has no problem with those pages being reused as pagetable pages.
      Deferring the TLB flush doesn't upset Xen because it can flush the TLB
      itself as needed to maintain its invariants.
      
      When unmapping a region in the vmalloc space, clear the ptes
      immediately.  There's no point in deferring this because there's no
      amortization benefit.
      
      The TLBs are left dirty, and they are flushed lazily to amortize the
      cost of the IPIs.
      
      This specific motivation for this patch is an oops-causing regression
      since 2.6.36 when using NFS under Xen, triggered by the NFS client's use
      of vm_map_ram() introduced in 56e4ebf8 ("NFS: readdir with vmapped
      pages") .  XFS also uses vm_map_ram() and could cause similar problems.
      Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
      Cc: Nick Piggin <npiggin@kernel.dk>
      Cc: Bryan Schumaker <bjschuma@netapp.com>
      Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
      Cc: Alex Elder <aelder@sgi.com>
      Cc: Dave Chinner <david@fromorbit.com>
      Cc: Christoph Hellwig <hch@lst.de>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      64141da5
  10. 30 11月, 2010 1 次提交
    • I
      xen: x86/32: perform initial startup on initial_page_table · 805e3f49
      Ian Campbell 提交于
      Only make swapper_pg_dir readonly and pinned when generic x86 architecture code
      (which also starts on initial_page_table) switches to it.  This helps ensure
      that the generic setup paths work on Xen unmodified. In particular
      clone_pgd_range writes directly to the destination pgd entries and is used to
      initialise swapper_pg_dir so we need to ensure that it remains writeable until
      the last possible moment during bring up.
      
      This is complicated slightly by the need to avoid sharing kernel PMD entries
      when running under Xen, therefore the Xen implementation must make a copy of
      the kernel PMD (which is otherwise referred to by both intial_page_table and
      swapper_pg_dir) before switching to swapper_pg_dir.
      Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: H. Peter Anvin <hpa@linux.intel.com>
      Cc: Jeremy Fitzhardinge <jeremy@goop.org>
      Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
      805e3f49
  11. 25 11月, 2010 1 次提交
    • I
      xen: x86/32: perform initial startup on initial_page_table · 5b5c1af1
      Ian Campbell 提交于
      Only make swapper_pg_dir readonly and pinned when generic x86 architecture code
      (which also starts on initial_page_table) switches to it.  This helps ensure
      that the generic setup paths work on Xen unmodified. In particular
      clone_pgd_range writes directly to the destination pgd entries and is used to
      initialise swapper_pg_dir so we need to ensure that it remains writeable until
      the last possible moment during bring up.
      
      This is complicated slightly by the need to avoid sharing kernel PMD entries
      when running under Xen, therefore the Xen implementation must make a copy of
      the kernel PMD (which is otherwise referred to by both intial_page_table and
      swapper_pg_dir) before switching to swapper_pg_dir.
      Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
      Tested-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: H. Peter Anvin <hpa@linux.intel.com>
      Cc: Jeremy Fitzhardinge <jeremy@goop.org>
      Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      5b5c1af1
  12. 13 11月, 2010 1 次提交
  13. 12 11月, 2010 1 次提交
  14. 30 10月, 2010 1 次提交
  15. 23 10月, 2010 16 次提交
  16. 21 10月, 2010 2 次提交
  17. 14 10月, 2010 1 次提交
    • J
      xen: Cope with unmapped pages when initializing kernel pagetable · fef5ba79
      Jeremy Fitzhardinge 提交于
      Xen requires that all pages containing pagetable entries to be mapped
      read-only.  If pages used for the initial pagetable are already mapped
      then we can change the mapping to RO.  However, if they are initially
      unmapped, we need to make sure that when they are later mapped, they
      are also mapped RO.
      
      We do this by knowing that the kernel pagetable memory is pre-allocated
      in the range e820_table_start - e820_table_end, so any pfn within this
      range should be mapped read-only.  However, the pagetable setup code
      early_ioremaps the pages to write their entries, so we must make sure
      that mappings created in the early_ioremap fixmap area are mapped RW.
      (Those mappings are removed before the pages are presented to Xen
      as pagetable pages.)
      Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
      LKML-Reference: <4CB63A80.8060702@goop.org>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>
      fef5ba79
  18. 28 8月, 2010 1 次提交
  19. 24 8月, 2010 1 次提交
  20. 30 7月, 2010 1 次提交
  21. 27 7月, 2010 1 次提交