1. 03 Feb, 2018 1 commit
  2. 17 Nov, 2017 1 commit
  3. 02 Nov, 2017 1 commit
    • Greg Kroah-Hartman's avatar
      License cleanup: add SPDX GPL-2.0 license identifier to files with no license · b2441318
      Greg Kroah-Hartman authored
      Many source files in the tree are missing licensing information, which
      makes it harder for compliance tools to determine the correct license.
      By default all files without license information are under the default
      license of the kernel, which is GPL version 2.
      Update the files which contain no license information with the 'GPL-2.0'
      SPDX license identifier.  The SPDX identifier is a legally binding
      shorthand, which can be used instead of the full boiler plate text.
      This patch is based on work done by Thomas Gleixner and Kate Stewart and
      Philippe Ombredanne.
      How this work was done:
      Patches were generated and checked against linux-4.14-rc6 for a subset of
      the use cases:
       - file had no licensing information it it.
       - file was a */uapi/* one with no licensing information in it,
       - file was a */uapi/* one with existing licensing information,
      Further patches will be generated in subsequent months to fix up cases
      where non-standard license headers were used, and references to license
      had to be inferred by heuristics based on keywords.
      The analysis to determine which SPDX License Identifier to be applied to
      a file was done in a spreadsheet of side by side results from of the
      output of two independent scanners (ScanCode & Windriver) producing SPDX
      tag:value files created by Philippe Ombredanne.  Philippe prepared the
      base worksheet, and did an initial spot review of a few 1000 files.
      The 4.13 kernel was the starting point of the analysis with 60,537 files
      assessed.  Kate Stewart did a file by file comparison of the scanner
      results in the spreadsheet to determine which SPDX license identifier(s)
      to be applied to the file. She confirmed any determination that was not
      immediately clear with lawyers working with the Linux Foundation.
      Criteria used to select files for SPDX license identifier tagging was:
       - Files considered eligible had to be source code files.
       - Make and config files were included as candidates if they contained >5
         lines of source
       - File already had some variant of a license header in it (even if <5
      All documentation files were explicitly excluded.
      The following heuristics were used to determine which SPDX license
      identifiers to apply.
       - when both scanners couldn't find any license traces, file was
         considered to have no license information in it, and the top level
         COPYING file license applied.
         For non */uapi/* files that summary was:
         SPDX license identifier                            # files
         GPL-2.0                                              11139
         and resulted in the first patch in this series.
         If that file was a */uapi/* path one, it was "GPL-2.0 WITH
         Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:
         SPDX license identifier                            # files
         GPL-2.0 WITH Linux-syscall-note                        930
         and resulted in the second patch in this series.
       - if a file had some form of licensing information in it, and was one
         of the */uapi/* ones, it was denoted with the Linux-syscall-note if
         any GPL family license was found in the file or had no licensing in
         it (per prior point).  Results summary:
         SPDX license identifier                            # files
         GPL-2.0 WITH Linux-syscall-note                       270
         GPL-2.0+ WITH Linux-syscall-note                      169
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
         ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
         LGPL-2.1+ WITH Linux-syscall-note                      15
         GPL-1.0+ WITH Linux-syscall-note                       14
         ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
         LGPL-2.0+ WITH Linux-syscall-note                       4
         LGPL-2.1 WITH Linux-syscall-note                        3
         ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
         ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1
         and that resulted in the third patch in this series.
       - when the two scanners agreed on the detected license(s), that became
         the concluded license(s).
       - when there was disagreement between the two scanners (one detected a
         license but the other didn't, or they both detected different
         licenses) a manual inspection of the file occurred.
       - In most cases a manual inspection of the information in the file
         resulted in a clear resolution of the license that should apply (and
         which scanner probably needed to revisit its heuristics).
       - When it was not immediately clear, the license identifier was
         confirmed with lawyers working with the Linux Foundation.
       - If there was any question as to the appropriate license identifier,
         the file was flagged for further research and to be revisited later
         in time.
      In total, over 70 hours of logged manual review was done on the
      spreadsheet to determine the SPDX license identifiers to apply to the
      source files by Kate, Philippe, Thomas and, in some cases, confirmation
      by lawyers working with the Linux Foundation.
      Kate also obtained a third independent scan of the 4.13 code base from
      FOSSology, and compared selected files where the other two scanners
      disagreed against that SPDX file, to see if there was new insights.  The
      Windriver scanner is based on an older version of FOSSology in part, so
      they are related.
      Thomas did random spot checks in about 500 files from the spreadsheets
      for the uapi headers and agreed with SPDX license identifier in the
      files he inspected. For the non-uapi files Thomas did random spot checks
      in about 15000 files.
      In initial set of patches against 4.14-rc6, 3 files were found to have
      copy/paste license identifier errors, and have been fixed to reflect the
      correct identifier.
      Additionally Philippe spent 10 hours this week doing a detailed manual
      inspection and review of the 12,461 patched files from the initial patch
      version early this week with:
       - a full scancode scan run, collecting the matched texts, detected
         license ids and scores
       - reviewing anything where there was a license detected (about 500+
         files) to ensure that the applied SPDX license was correct
       - reviewing anything where there was no detection but the patch license
         was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
         SPDX license was correct
      This produced a worksheet with 20 files needing minor correction.  This
      worksheet was then exported into 3 different .csv files for the
      different types of files to be modified.
      These .csv files were then reviewed by Greg.  Thomas wrote a script to
      parse the csv files and add the proper SPDX tag to the file, in the
      format that the file expected.  This script was further refined by Greg
      based on the output to detect more types of files automatically and to
      distinguish between header and source .c files (which need different
      comment types.)  Finally Greg ran the script using the .csv files to
      generate the patches.
      Reviewed-by: default avatarKate Stewart <kstewart@linuxfoundation.org>
      Reviewed-by: default avatarPhilippe Ombredanne <pombredanne@nexb.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
  4. 13 Sep, 2017 1 commit
  5. 24 Aug, 2017 1 commit
  6. 07 Aug, 2017 3 commits
  7. 07 Jun, 2017 1 commit
  8. 21 Apr, 2017 1 commit
  9. 23 Jul, 2016 1 commit
    • Dan Williams's avatar
      Revert "KVM: x86: add pcommit support" · dfa169bb
      Dan Williams authored
      This reverts commit 8b3e34e4
      Given the deprecation of the pcommit instruction, the relevant VMX
      features and CPUID bits are not going to be rolled into the SDM.  Remove
      their usage from KVM.
      Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
      Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
  10. 22 Mar, 2016 1 commit
  11. 09 Mar, 2016 1 commit
    • Paolo Bonzini's avatar
      KVM: x86: disable MPX if host did not enable MPX XSAVE features · a87036ad
      Paolo Bonzini authored
      When eager FPU is disabled, KVM will still see the MPX bit in CPUID and
      presumably the MPX vmentry and vmexit controls.  However, it will not
      be able to expose the MPX XSAVE features to the guest, because the guest's
      accessible XSAVE features are always a subset of host_xcr0.
      In this case, we should disable the MPX CPUID bit, the BNDCFGS MSR,
      and the MPX vmentry and vmexit controls for nested virtualization.
      It is then unnecessary to enable guest eager FPU if the guest has the
      MPX CPUID bit set.
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
  12. 22 Dec, 2015 1 commit
  13. 24 Nov, 2015 1 commit
  14. 16 Oct, 2015 1 commit
  15. 01 Oct, 2015 2 commits
  16. 04 Jun, 2015 1 commit
  17. 20 May, 2015 1 commit
  18. 08 Apr, 2015 1 commit
  19. 31 Mar, 2015 1 commit
  20. 24 Sep, 2014 1 commit
  21. 03 Sep, 2014 1 commit
  22. 21 Jul, 2014 1 commit
    • Nadav Amit's avatar
      KVM: x86: DR6/7.RTM cannot be written · 6f43ed01
      Nadav Amit authored
      Haswell and newer Intel CPUs have support for RTM, and in that case DR6.RTM is
      not fixed to 1 and DR7.RTM is not fixed to zero. That is not the case in the
      current KVM implementation. This bug is apparent only if the MOV-DR instruction
      is emulated or the host also debugs the guest.
      This patch is a partial fix which enables DR6.RTM and DR7.RTM to be cleared and
      set respectively. It also sets DR6.RTM upon every debug exception. Obviously,
      it is not a complete fix, as debugging of RTM is still unsupported.
      Signed-off-by: default avatarNadav Amit <namit@cs.technion.ac.il>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
  23. 07 May, 2014 1 commit
  24. 14 Apr, 2014 1 commit
  25. 27 Jan, 2014 1 commit
  26. 30 Oct, 2013 1 commit
    • Borislav Petkov's avatar
      kvm: Add KVM_GET_EMULATED_CPUID · 9c15bb1d
      Borislav Petkov authored
      Add a kvm ioctl which states which system functionality kvm emulates.
      The format used is that of CPUID and we return the corresponding CPUID
      bits set for which we do emulate functionality.
      Make sure ->padding is being passed on clean from userspace so that we
      can use it for something in the future, after the ioctl gets cast in
      s/kvm_dev_ioctl_get_supported_cpuid/kvm_dev_ioctl_get_cpuid/ while at
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
  27. 30 Nov, 2012 1 commit
    • Will Auld's avatar
      KVM: x86: Emulate IA32_TSC_ADJUST MSR · ba904635
      Will Auld authored
      CPUID.7.0.EBX[1]=1 indicates IA32_TSC_ADJUST MSR 0x3b is supported
      Basic design is to emulate the MSR by allowing reads and writes to a guest
      vcpu specific location to store the value of the emulated MSR while adding
      the value to the vmcs tsc_offset. In this way the IA32_TSC_ADJUST value will
      be included in all reads to the TSC MSR whether through rdmsr or rdtsc. This
      is of course as long as the "use TSC counter offsetting" VM-execution control
      is enabled as well as the IA32_TSC_ADJUST control.
      However, because hardware will only return the TSC + IA32_TSC_ADJUST +
      vmsc tsc_offset for a guest process when it does and rdtsc (with the correct
      settings) the value of our virtualized IA32_TSC_ADJUST must be stored in one
      of these three locations. The argument against storing it in the actual MSR
      is performance. This is likely to be seldom used while the save/restore is
      required on every transition. IA32_TSC_ADJUST was created as a way to solve
      some issues with writing TSC itself so that is not an option either.
      The remaining option, defined above as our solution has the problem of
      returning incorrect vmcs tsc_offset values (unless we intercept and fix, not
      done here) as mentioned above. However, more problematic is that storing the
      data in vmcs tsc_offset will have a different semantic effect on the system
      than does using the actual MSR. This is illustrated in the following example:
      The hypervisor set the IA32_TSC_ADJUST, then the guest sets it and a guest
      process performs a rdtsc. In this case the guest process will get
      TSC + IA32_TSC_ADJUST_hyperviser + vmsc tsc_offset including
      IA32_TSC_ADJUST_guest. While the total system semantics changed the semantics
      as seen by the guest do not and hence this will not cause a problem.
      Signed-off-by: default avatarWill Auld <will.auld@intel.com>
      Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
  28. 12 Nov, 2012 1 commit
    • Petr Matousek's avatar
      KVM: x86: invalid opcode oops on SET_SREGS with OSXSAVE bit set (CVE-2012-4461) · 6d1068b3
      Petr Matousek authored
      On hosts without the XSAVE support unprivileged local user can trigger
      oops similar to the one below by setting X86_CR4_OSXSAVE bit in guest
      cr4 register using KVM_SET_SREGS ioctl and later issuing KVM_RUN
      invalid opcode: 0000 [#2] SMP
      Modules linked in: tun ip6table_filter ip6_tables ebtable_nat ebtables
      Pid: 24935, comm: zoog_kvm_monito Tainted: G      D      3.2.0-3-686-pae
      EIP: 0060:[<f8b9550c>] EFLAGS: 00210246 CPU: 0
      EIP is at kvm_arch_vcpu_ioctl_run+0x92a/0xd13 [kvm]
      EAX: 00000001 EBX: 000f387e ECX: 00000000 EDX: 00000000
      ESI: 00000000 EDI: 00000000 EBP: ef5a0060 ESP: d7c63e70
       DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
      Process zoog_kvm_monito (pid: 24935, ti=d7c62000 task=ed84a0c0
       00000001 f70a1200 f8b940a9 ef5a0060 00000000 00200202 f8769009 00000000
       ef5a0060 000f387e eda5c020 8722f9c8 00015bae 00000000 ed84a0c0 ed84a0c0
       c12bf02d 0000ae80 ef7f8740 fffffffb f359b740 ef5a0060 f8b85dc1 0000ae80
      Call Trace:
       [<f8b940a9>] ? kvm_arch_vcpu_ioctl_set_sregs+0x2fe/0x308 [kvm]
       [<c12bfb44>] ? syscall_call+0x7/0xb
      Code: 89 e8 e8 14 ee ff ff ba 00 00 04 00 89 e8 e8 98 48 ff ff 85 c0 74
      1e 83 7d 48 00 75 18 8b 85 08 07 00 00 31 c9 8b 95 0c 07 00 00 <0f> 01
      d1 c7 45 48 01 00 00 00 c7 45 1c 01 00 00 00 0f ae f0 89
      EIP: [<f8b9550c>] kvm_arch_vcpu_ioctl_run+0x92a/0xd13 [kvm] SS:ESP
      QEMU first retrieves the supported features via KVM_GET_SUPPORTED_CPUID
      and then sets them later. So guest's X86_FEATURE_XSAVE should be masked
      out on hosts without X86_FEATURE_XSAVE, making kvm_set_cr4 with
      X86_CR4_OSXSAVE fail. Userspaces that allow specifying guest cpuid with
      X86_FEATURE_XSAVE even on hosts that do not support it, might be
      susceptible to this attack from inside the guest as well.
      Allow setting X86_CR4_OSXSAVE bit only if host has XSAVE support.
      Signed-off-by: default avatarPetr Matousek <pmatouse@redhat.com>
      Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
  29. 12 Jul, 2012 1 commit
    • Mao, Junjie's avatar
      KVM: VMX: Implement PCID/INVPCID for guests with EPT · ad756a16
      Mao, Junjie authored
      This patch handles PCID/INVPCID for guests.
      Process-context identifiers (PCIDs) are a facility by which a logical processor
      may cache information for multiple linear-address spaces so that the processor
      may retain cached information when software switches to a different linear
      address space. Refer to section 4.10.1 in IA32 Intel Software Developer's Manual
      Volume 3A for details.
      For guests with EPT, the PCID feature is enabled and INVPCID behaves as running
      For guests without EPT, the PCID feature is disabled and INVPCID triggers #UD.
      Signed-off-by: default avatarJunjie Mao <junjie.mao@intel.com>
      Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
  30. 09 Jul, 2012 1 commit
    • Avi Kivity's avatar
      KVM: Split cpuid register access from computation · 62046e5a
      Avi Kivity authored
      Introduce kvm_cpuid() to perform the leaf limit check and calculate
      register values, and let kvm_emulate_cpuid() just handle reading and
      writing the registers from/to the vcpu.  This allows us to reuse
      kvm_cpuid() in a context where directly reading and writing registers
      is not desired.
      Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
  31. 05 Mar, 2012 1 commit
  32. 27 Dec, 2011 1 commit