1. 26 Jan, 2016 1 commit
  2. 21 Jan, 2016 1 commit
  3. 19 Jan, 2016 3 commits
  4. 15 Jan, 2016 15 commits
  5. 14 Jan, 2016 1 commit
  6. 13 Jan, 2016 3 commits
  7. 12 Jan, 2016 16 commits
    • Mario Kleiner's avatar
      x86/reboot/quirks: Add iMac10,1 to pci_reboot_dmi_table[] · 2f0c0b2d
      Mario Kleiner authored
      Without the reboot=pci method, the iMac 10,1 simply
      hangs after printing "Restarting system" at the point
      when it should reboot. This fixes it.
      Signed-off-by: default avatarMario Kleiner <mario.kleiner.de@gmail.com>
      Cc: <stable@vger.kernel.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dave Jones <davej@codemonkey.org.uk>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1450466646-26663-1-git-send-email-mario.kleiner.de@gmail.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      2f0c0b2d
    • Rusty Russell's avatar
      lguest: Map switcher text R/O · e27d90e8
      Rusty Russell authored
      Pavel noted that lguest maps the switcher code executable and
      read-write.  This is a bad idea for any kernel text, but
      particularly for text mapped at a fixed address.
      
      Create two vmas, one for the text (PAGE_KERNEL_RX) and another
      for the stacks (PAGE_KERNEL).  Use VM_NO_GUARD to map them
      adjacent (as expected by the rest of the code).
      Reported-by: default avatarPavel Machek <pavel@ucw.cz>
      Tested-by: default avatarPavel Machek <pavel@ucw.cz>
      Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      e27d90e8
    • Borislav Petkov's avatar
      x86/boot: Hide local labels in verify_cpu() · aa042141
      Borislav Petkov authored
      ... from the final ELF image's symbol table as they're not
      really needed there.
      
      Before:
      
      $ readelf -a vmlinux | grep verify_cpu
          43: ffffffff810001a9     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu
          45: ffffffff8100028f     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_no_longmode
          46: ffffffff810001de     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_noamd
          47: ffffffff8100022b     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_check
          48: ffffffff8100021c     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_clear_xd
          49: ffffffff81000263     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_sse_test
          50: ffffffff81000296     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu_sse_ok
      
      After:
      
      $ readelf -a vmlinux | grep verify_cpu
          43: ffffffff810001a9     0 NOTYPE  LOCAL  DEFAULT    1 verify_cpu
      
      No functionality change.
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1451860733-21163-1-git-send-email-bp@alien8.deSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      aa042141
    • yu-cheng yu's avatar
      x86/fpu: Disable AVX when eagerfpu is off · 394db20c
      yu-cheng yu authored
      When "eagerfpu=off" is given as a command-line input, the kernel
      should disable AVX support.
      
      The Task Switched bit used for lazy context switching does not
      support AVX. If AVX is enabled without eagerfpu context
      switching, one task's AVX state could become corrupted or leak
      to other tasks. This is a bug and has bad security implications.
      
      This only affects systems that have AVX/AVX2/AVX512 and this
      issue will be found only when one actually uses AVX/AVX2/AVX512
      _AND_ does eagerfpu=off.
      
      Reference: Intel Software Developer's Manual Vol. 3A
      
      Sec. 2.5 Control Registers:
      TS Task Switched bit (bit 3 of CR0) -- Allows the saving of the
      x87 FPU/ MMX/SSE/SSE2/SSE3/SSSE3/SSE4 context on a task switch
      to be delayed until an x87 FPU/MMX/SSE/SSE2/SSE3/SSSE3/SSE4
      instruction is actually executed by the new task.
      
      Sec. 13.4.1 Using the TS Flag to Control the Saving of the X87
      FPU and SSE State
      When the TS flag is set, the processor monitors the instruction
      stream for x87 FPU, MMX, SSE instructions. When the processor
      detects one of these instructions, it raises a
      device-not-available exeception (#NM) prior to executing the
      instruction.
      Signed-off-by: default avatarYu-cheng Yu <yu-cheng.yu@intel.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
      Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
      Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: yu-cheng yu <yu-cheng.yu@intel.com>
      Link: http://lkml.kernel.org/r/1452119094-7252-5-git-send-email-yu-cheng.yu@intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      394db20c
    • yu-cheng yu's avatar
      x86/fpu: Disable MPX when eagerfpu is off · a5fe93a5
      yu-cheng yu authored
      This issue is a fallout from the command-line parsing move.
      
      When "eagerfpu=off" is given as a command-line input, the kernel
      should disable MPX support. The decision for turning off MPX was
      made in fpu__init_system_ctx_switch(), which is after the
      selection of the XSAVE format. This patch fixes it by getting
      that decision done earlier in fpu__init_system_xstate().
      Signed-off-by: default avatarYu-cheng Yu <yu-cheng.yu@intel.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
      Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
      Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: yu-cheng yu <yu-cheng.yu@intel.com>
      Link: http://lkml.kernel.org/r/1452119094-7252-4-git-send-email-yu-cheng.yu@intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      a5fe93a5
    • yu-cheng yu's avatar
      x86/fpu: Disable XGETBV1 when no XSAVE · eb7c5f87
      yu-cheng yu authored
      When "noxsave" is given as a command-line input, the kernel
      should disable XGETBV1. This issue currently does not cause any
      actual problems. XGETBV1 is only useful if we have something
      using the 'init optimization' (i.e. xsaveopt, xsaves). We
      already clear both of those in fpu__xstate_clear_all_cpu_caps().
      But this is good for completeness.
      Signed-off-by: default avatarYu-cheng Yu <yu-cheng.yu@intel.com>
      Reviewed-by: default avatarDave Hansen <dave.hansen@intel.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
      Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
      Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: yu-cheng yu <yu-cheng.yu@intel.com>
      Link: http://lkml.kernel.org/r/1452119094-7252-3-git-send-email-yu-cheng.yu@intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      eb7c5f87
    • yu-cheng yu's avatar
      x86/fpu: Fix early FPU command-line parsing · 4f81cbaf
      yu-cheng yu authored
      The function fpu__init_system() is executed before
      parse_early_param(). This causes wrong FPU configuration. This
      patch fixes this issue by parsing boot_command_line in the
      beginning of fpu__init_system().
      
      With all four patches in this series, each parameter disables
      features as the following:
      
      eagerfpu=off: eagerfpu, avx, avx2, avx512, mpx
      no387: fpu
      nofxsr: fxsr, fxsropt, xmm
      noxsave: xsave, xsaveopt, xsaves, xsavec, avx, avx2, avx512,
      mpx, xgetbv1 noxsaveopt: xsaveopt
      noxsaves: xsaves
      Signed-off-by: default avatarYu-cheng Yu <yu-cheng.yu@intel.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
      Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
      Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: yu-cheng yu <yu-cheng.yu@intel.com>
      Link: http://lkml.kernel.org/r/1452119094-7252-2-git-send-email-yu-cheng.yu@intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      4f81cbaf
    • Kefeng Wang's avatar
      x86/mm: Use PAGE_ALIGNED instead of IS_ALIGNED · b500f77b
      Kefeng Wang authored
      Use PAGE_ALIGEND macro in <linux/mm.h> to simplify code.
      Signed-off-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
      Cc: <guohanjun@huawei.com>
      Cc: Alexander Kuleshov <kuleshovmail@gmail.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1452565170-11083-1-git-send-email-wangkefeng.wang@huawei.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      b500f77b
    • Andy Lutomirski's avatar
      selftests/x86: Disable the ldt_gdt_64 test for now · 0f672809
      Andy Lutomirski authored
      ldt_gdt.c relies on cross-cpu invalidation of SS to do one of
      its tests.  On 32-bit builds, this works fine, but on 64-bit
      builds, it only works if the kernel has proper SS sigcontext
      handling for 64-bit user programs.
      
      Since the SS fixes are currently reverted, restrict the test
      case to 32 bits for now.
      
      In principle, I could change the test to use a different segment
      register, but it would be messy: CS can't point to the LDT for
      64-bit code, and the other registers don't result in immediate
      faults because they aren't reloaded on kernel -> user
      transitions.
      
      When we fix sigcontext (in 4.6?), we can revert this.
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Shuah Khan <shuahkh@osg.samsung.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/231591d9122d282402d8f53175134f8db5b3bc73.1452561752.git.luto@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      0f672809
    • Dave Jones's avatar
      x86/mm/pat: Make split_page_count() check for empty levels to fix /proc/meminfo output · c9e0d391
      Dave Jones authored
      In CONFIG_PAGEALLOC_DEBUG=y builds, we disable 2M pages.
      
      Unfortunatly when we split up mappings during boot,
      split_page_count() doesn't take this into account, and
      starts decrementing an empty direct_pages_count[] level.
      
      This results in /proc/meminfo showing crazy things like:
      
        DirectMap2M:    18446744073709543424 kB
      Signed-off-by: default avatarDave Jones <davej@codemonkey.org.uk>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Luis R. Rodriguez <mcgrof@suse.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Toshi Kani <toshi.kani@hp.com>
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      c9e0d391
    • Ingo Molnar's avatar
    • Linus Torvalds's avatar
      Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · ae8a5218
      Linus Torvalds authored
      Pull x86 platform updates from Ingo Molnar:
       "Two changes:
      
         - one to quirk-save/restore certain system MSRs across
           suspend/resume, to make certain Intel systems work better
           (Chen Yu)
      
         - and also to constify a read only structure (Julia Lawall)"
      
      * 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/platform/calgary: Constify cal_chipset_ops structures
        x86/pm: Introduce quirk framework to save/restore extra MSR registers around suspend/resume
      ae8a5218
    • Linus Torvalds's avatar
      Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 0ffedcda
      Linus Torvalds authored
      Pull x86 mm updates from Ingo Molnar:
       "The main changes in this cycle were:
      
         - make the debugfs 'kernel_page_tables' file read-only, as it only
           has read ops.  (Borislav Petkov)
      
         - micro-optimize clflush_cache_range() (Chris Wilson)
      
         - swiotlb enhancements, which fixes certain KVM emulated devices
           (Igor Mammedov)
      
         - fix an LDT related debug message (Jan Beulich)
      
         - modularize CONFIG_X86_PTDUMP (Kees Cook)
      
         - tone down an overly alarming warning (Laura Abbott)
      
         - Mark variable __initdata (Rasmus Villemoes)
      
         - PAT additions (Toshi Kani)"
      
      * 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/mm: Micro-optimise clflush_cache_range()
        x86/mm/pat: Change free_memtype() to support shrinking case
        x86/mm/pat: Add untrack_pfn_moved for mremap
        x86/mm: Drop WARN from multi-BAR check
        x86/LDT: Print the real LDT base address
        x86/mm/64: Enable SWIOTLB if system has SRAT memory regions above MAX_DMA32_PFN
        x86/mm: Introduce max_possible_pfn
        x86/mm/ptdump: Make (debugfs)/kernel_page_tables read-only
        x86/mm/mtrr: Mark the 'range_new' static variable in mtrr_calc_range_state() as __initdata
        x86/mm: Turn CONFIG_X86_PTDUMP into a module
      0ffedcda
    • Linus Torvalds's avatar
      Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 6896d9f7
      Linus Torvalds authored
      Pull x86 fpu updates from Ingo Molnar:
       "This cleans up the FPU fault handling methods to be more robust, and
        moves eligible variables to .init.data"
      
      * 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/fpu: Put a few variables in .init.data
        x86/fpu: Get rid of xstate_fault()
        x86/fpu: Add an XSTATE_OP() macro
      6896d9f7
    • Linus Torvalds's avatar
      Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 671d5532
      Linus Torvalds authored
      Pull x86 cpu updates from Ingo Molnar:
       "The main changes in this cycle were:
      
         - Improved CPU ID handling code and related enhancements (Borislav
           Petkov)
      
         - RDRAND fix (Len Brown)"
      
      * 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86: Replace RDRAND forced-reseed with simple sanity check
        x86/MSR: Chop off lower 32-bit value
        x86/cpu: Fix MSR value truncation issue
        x86/cpu/amd, kvm: Satisfy guest kernel reads of IC_CFG MSR
        kvm: Add accessors for guest CPU's family, model, stepping
        x86/cpu: Unify CPU family, model, stepping calculation
      671d5532
    • Linus Torvalds's avatar
      Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · 67c707e4
      Linus Torvalds authored
      Pull x86 cleanups from Ingo Molnar:
       "The main changes in this cycle were:
      
         - code patching and cpu_has cleanups (Borislav Petkov)
      
         - paravirt cleanups (Juergen Gross)
      
         - TSC cleanup (Thomas Gleixner)
      
         - ptrace cleanup (Chen Gang)"
      
      * 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        arch/x86/kernel/ptrace.c: Remove unused arg_offs_table
        x86/mm: Align macro defines
        x86/cpu: Provide a config option to disable static_cpu_has
        x86/cpufeature: Remove unused and seldomly used cpu_has_xx macros
        x86/cpufeature: Cleanup get_cpu_cap()
        x86/cpufeature: Move some of the scattered feature bits to x86_capability
        x86/paravirt: Remove paravirt ops pmd_update[_defer] and pte_update_defer
        x86/paravirt: Remove unused pv_apic_ops structure
        x86/tsc: Remove unused tsc_pre_init() hook
        x86: Remove unused function cpu_has_ht_siblings()
        x86/paravirt: Kill some unused patching functions
      67c707e4