1. 07 Jul, 2011 2 commits
    • Matthew Garrett's avatar
      x86: Don't use the EFI reboot method by default · f70e957c
      Matthew Garrett authored
      Testing suggests that at least some Lenovos and some Intels will
      fail to reboot via EFI, attempting to jump to an unmapped
      physical address. In the long run we could handle this by
      providing a page table with a 1:1 mapping of physical addresses,
      but for now it's probably just easier to assume that ACPI or
      legacy methods will be present and reboot via those.
      Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Alan Cox <alan@linux.intel.com>
      Link: http://lkml.kernel.org/r/1309985557-15350-1-git-send-email-mjg@redhat.comSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
      f70e957c
    • Kees Cook's avatar
      x86, suspend: Restore MISC_ENABLE MSR in realmode wakeup · 7a313666
      Kees Cook authored
      Some BIOSes will reset the Intel MISC_ENABLE MSR (specifically the
      XD_DISABLE bit) when resuming from S3, which can interact poorly with
      ebba638a. In 32bit PAE mode, this can
      lead to a fault when EFER is restored by the kernel wakeup routines,
      due to it setting the NX bit for a CPU that (thanks to the BIOS reset)
      now incorrectly thinks it lacks the NX feature. (64bit is not affected
      because it uses a common CPU bring-up that specifically handles the
      XD_DISABLE bit.)
      
      The need for MISC_ENABLE being restored so early is specific to the S3
      resume path. Normally, MISC_ENABLE is saved in save_processor_state(),
      but this happens after the resume header is created, so just reproduce
      the logic here. (acpi_suspend_lowlevel() creates the header, calls
      do_suspend_lowlevel, which calls save_processor_state(), so the saved
      processor context isn't available during resume header creation.)
      
      [ hpa: Consider for stable if OK in mainline ]
      Signed-off-by: default avatarKees Cook <kees.cook@canonical.com>
      Link: http://lkml.kernel.org/r/20110707011034.GA8523@outflux.netSigned-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
      Cc: Rafael J. Wysocki <rjw@sisk.pl>
      Cc: <stable@kernel.org> 2.6.38+
      7a313666
  2. 06 Jul, 2011 1 commit
  3. 01 Jul, 2011 1 commit
    • Tejun Heo's avatar
      x86-32, NUMA: Fix boot regression caused by NUMA init unification on highmem machines · a26474e8
      Tejun Heo authored
      During 32/64 NUMA init unification, commit 797390d8 ("x86-32,
      NUMA: use sparse_memory_present_with_active_regions()") made
      32bit mm init call memory_present() automatically from
      active_regions instead of leaving it to each NUMA init path.
      
      This commit description is inaccurate - memory_present() calls
      aren't the same for flat and numaq.  After the commit,
      memory_present() is only called for the intersection of e820 and
      NUMA layout.  Before, on flatmem, memory_present() would be
      called from 0 to max_pfn.  After, it would be called only on the
      areas that e820 indicates to be populated.
      
      This is how x86_64 works and should be okay as memmap is allowed
      to contain holes; however, x86_32 DISCONTIGMEM is missing
      early_pfn_valid(), which makes memmap_init_zone() assume that
      memmap doesn't contain any hole.  This leads to the following
      oops if e820 map contains holes as it often does on machine with
      near or more 4GiB of memory by calling pfn_to_page() on a pfn
      which isn't mapped to a NUMA node, a reported by Conny Seidel:
      
        BUG: unable to handle kernel paging request at 000012b0
        IP: [<c1aa13ce>] memmap_init_zone+0x6c/0xf2
        *pdpt =3D 0000000000000000 *pde =3D f000eef3f000ee00
        Oops: 0000 [#1] SMP
        last sysfs file:
        Modules linked in:
      
        Pid: 0, comm: swapper Not tainted 2.6.39-rc5-00164-g797390d8 #1 To Be Filled By O.E.M. To Be Filled By O.E.M./E350M1
        EIP: 0060:[<c1aa13ce>] EFLAGS: 00010012 CPU: 0
        EIP is at memmap_init_zone+0x6c/0xf2
        EAX: 00000000 EBX: 000a8000 ECX: 000a7fff EDX: f2c00b80
        ESI: 000a8000 EDI: f2c00800 EBP: c19ffe54 ESP: c19ffe34
         DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
        Process swapper (pid: 0, ti=3Dc19fe000 task=3Dc1a07f60 task.ti=3Dc19fe000)
        Stack:
         00000002 00000000 0023f000 00000000 10000000 00000a00 f2c00000 f2c00b58
         c19ffeb0 c1a80f24 000375fe 00000000 f2c00800 00000800 00000100 00000030
         c1abb768 0000003c 00000000 00000000 00000004 00207a02 f2c00800 000375fe
        Call Trace:
         [<c1a80f24>] free_area_init_node+0x358/0x385
         [<c1a81384>] free_area_init_nodes+0x420/0x487
         [<c1a79326>] paging_init+0x114/0x11b
         [<c1a6cb13>] setup_arch+0xb37/0xc0a
         [<c1a69554>] start_kernel+0x76/0x316
         [<c1a690a8>] i386_start_kernel+0xa8/0xb0
      
      This patch fixes the bug by defining early_pfn_valid() to be the
      same as pfn_valid() when DISCONTIGMEM.
      Reported-bisected-and-tested-by: default avatarConny Seidel <conny.seidel@amd.com>
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Cc: hans.rosenfeld@amd.com
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Conny Seidel <conny.seidel@amd.com>
      Link: http://lkml.kernel.org/r/20110628094107.GB3386@htj.dyndns.orgSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
      a26474e8
  4. 30 Jun, 2011 13 commits
  5. 29 Jun, 2011 18 commits
  6. 28 Jun, 2011 5 commits