1. 10 Oct, 2018 1 commit
    • Juergen Gross's avatar
      x86/boot: Add ACPI RSDP address to setup_header · ae7e1238
      Juergen Gross authored
      Xen PVH guests receive the address of the RSDP table from Xen. In order
      to support booting a Xen PVH guest via Grub2 using the standard x86
      boot entry we need a way for Grub2 to pass the RSDP address to the
      kernel.
      
      For this purpose expand the struct setup_header to hold the physical
      address of the RSDP address. Being zero means it isn't specified and
      has to be located the legacy way (searching through low memory or
      EBDA).
      
      While documenting the new setup_header layout and protocol version
      2.14 add the missing documentation of protocol version 2.13.
      
      There are Grub2 versions in several distros with a downstream patch
      violating the boot protocol by writing past the end of setup_header.
      This requires another update of the boot protocol to enable the kernel
      to distinguish between a specified RSDP address and one filled with
      garbage by such a broken Grub2.
      
      From protocol 2.14 on Grub2 will write the version it is supporting
      (but never a higher value than found to be supported by the kernel)
      ored with 0x8000 to the version field of setup_header. This enables
      the kernel to know up to which field Grub2 has written information
      to. All fields after that are supposed to be clobbered.
      Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: boris.ostrovsky@oracle.com
      Cc: bp@alien8.de
      Cc: corbet@lwn.net
      Cc: linux-doc@vger.kernel.org
      Cc: xen-devel@lists.xenproject.org
      Link: http://lkml.kernel.org/r/20181010061456.22238-3-jgross@suse.comSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      ae7e1238
  2. 20 Sep, 2018 1 commit
  3. 15 Sep, 2018 1 commit
    • Brijesh Singh's avatar
      x86/mm: Add .bss..decrypted section to hold shared variables · b3f0907c
      Brijesh Singh authored
      kvmclock defines few static variables which are shared with the
      hypervisor during the kvmclock initialization.
      
      When SEV is active, memory is encrypted with a guest-specific key, and
      if the guest OS wants to share the memory region with the hypervisor
      then it must clear the C-bit before sharing it.
      
      Currently, we use kernel_physical_mapping_init() to split large pages
      before clearing the C-bit on shared pages. But it fails when called from
      the kvmclock initialization (mainly because the memblock allocator is
      not ready that early during boot).
      
      Add a __bss_decrypted section attribute which can be used when defining
      such shared variable. The so-defined variables will be placed in the
      .bss..decrypted section. This section will be mapped with C=0 early
      during boot.
      
      The .bss..decrypted section has a big chunk of memory that may be unused
      when memory encryption is not active, free it when memory encryption is
      not active.
      Suggested-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Tom Lendacky <thomas.lendacky@amd.com>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Sean Christopherson <sean.j.christopherson@intel.com>
      Cc: Radim Krčmář<rkrcmar@redhat.com>
      Cc: kvm@vger.kernel.org
      Link: https://lkml.kernel.org/r/1536932759-12905-2-git-send-email-brijesh.singh@amd.com
      b3f0907c
  4. 23 Jun, 2018 1 commit
  5. 19 May, 2018 4 commits
  6. 14 May, 2018 1 commit
  7. 12 Apr, 2018 1 commit
    • Dave Hansen's avatar
      x86/mm: Do not auto-massage page protections · fb43d6cb
      Dave Hansen authored
      A PTE is constructed from a physical address and a pgprotval_t.
      __PAGE_KERNEL, for instance, is a pgprot_t and must be converted
      into a pgprotval_t before it can be used to create a PTE.  This is
      done implicitly within functions like pfn_pte() by massage_pgprot().
      
      However, this makes it very challenging to set bits (and keep them
      set) if your bit is being filtered out by massage_pgprot().
      
      This moves the bit filtering out of pfn_pte() and friends.  For
      users of PAGE_KERNEL*, filtering will be done automatically inside
      those macros but for users of __PAGE_KERNEL*, they need to do their
      own filtering now.
      
      Note that we also just move pfn_pte/pmd/pud() over to check_pgprot()
      instead of massage_pgprot().  This way, we still *look* for
      unsupported bits and properly warn about them if we find them.  This
      might happen if an unfiltered __PAGE_KERNEL* value was passed in,
      for instance.
      
      - printk format warning fix from: Arnd Bergmann <arnd@arndb.de>
      - boot crash fix from:            Tom Lendacky <thomas.lendacky@amd.com>
      - crash bisected by:              Mike Galbraith <efault@gmx.de>
      Signed-off-by: default avatarDave Hansen <dave.hansen@linux.intel.com>
      Reported-and-fixed-by: default avatarArnd Bergmann <arnd@arndb.de>
      Fixed-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
      Bisected-by: default avatarMike Galbraith <efault@gmx.de>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
      Cc: Hugh Dickins <hughd@google.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Kees Cook <keescook@google.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Nadav Amit <namit@vmware.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/20180406205509.77E1D7F6@viggo.jf.intel.comSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      fb43d6cb
  8. 21 Feb, 2018 1 commit
    • Kirill A. Shutemov's avatar
      x86/mm: Optimize boot-time paging mode switching cost · 39b95522
      Kirill A. Shutemov authored
      By this point we have functioning boot-time switching between 4- and
      5-level paging mode. But naive approach comes with cost.
      
      Numbers below are for kernel build, allmodconfig, 5 times.
      
      CONFIG_X86_5LEVEL=n:
      
       Performance counter stats for 'sh -c make -j100 -B -k >/dev/null' (5 runs):
      
         17308719.892691      task-clock:u (msec)       #   26.772 CPUs utilized            ( +-  0.11% )
                       0      context-switches:u        #    0.000 K/sec
                       0      cpu-migrations:u          #    0.000 K/sec
             331,993,164      page-faults:u             #    0.019 M/sec                    ( +-  0.01% )
      43,614,978,867,455      cycles:u                  #    2.520 GHz                      ( +-  0.01% )
      39,371,534,575,126      stalled-cycles-frontend:u #   90.27% frontend cycles idle     ( +-  0.09% )
      28,363,350,152,428      instructions:u            #    0.65  insn per cycle
                                                        #    1.39  stalled cycles per insn  ( +-  0.00% )
       6,316,784,066,413      branches:u                #  364.948 M/sec                    ( +-  0.00% )
         250,808,144,781      branch-misses:u           #    3.97% of all branches          ( +-  0.01% )
      
           646.531974142 seconds time elapsed                                          ( +-  1.15% )
      
      CONFIG_X86_5LEVEL=y:
      
       Performance counter stats for 'sh -c make -j100 -B -k >/dev/null' (5 runs):
      
         17411536.780625      task-clock:u (msec)       #   26.426 CPUs utilized            ( +-  0.10% )
                       0      context-switches:u        #    0.000 K/sec
                       0      cpu-migrations:u          #    0.000 K/sec
             331,868,663      page-faults:u             #    0.019 M/sec                    ( +-  0.01% )
      43,865,909,056,301      cycles:u                  #    2.519 GHz                      ( +-  0.01% )
      39,740,130,365,581      stalled-cycles-frontend:u #   90.59% frontend cycles idle     ( +-  0.05% )
      28,363,358,997,959      instructions:u            #    0.65  insn per cycle
                                                        #    1.40  stalled cycles per insn  ( +-  0.00% )
       6,316,784,937,460      branches:u                #  362.793 M/sec                    ( +-  0.00% )
         251,531,919,485      branch-misses:u           #    3.98% of all branches          ( +-  0.00% )
      
           658.886307752 seconds time elapsed                                          ( +-  0.92% )
      
      The patch tries to fix the performance regression by using
      cpu_feature_enabled(X86_FEATURE_LA57) instead of pgtable_l5_enabled in
      all hot code paths. These will statically patch the target code for
      additional performance.
      
      CONFIG_X86_5LEVEL=y + the patch:
      
       Performance counter stats for 'sh -c make -j100 -B -k >/dev/null' (5 runs):
      
         17381990.268506      task-clock:u (msec)       #   26.907 CPUs utilized            ( +-  0.19% )
                       0      context-switches:u        #    0.000 K/sec
                       0      cpu-migrations:u          #    0.000 K/sec
             331,862,625      page-faults:u             #    0.019 M/sec                    ( +-  0.01% )
      43,697,726,320,051      cycles:u                  #    2.514 GHz                      ( +-  0.03% )
      39,480,408,690,401      stalled-cycles-frontend:u #   90.35% frontend cycles idle     ( +-  0.05% )
      28,363,394,221,388      instructions:u            #    0.65  insn per cycle
                                                        #    1.39  stalled cycles per insn  ( +-  0.00% )
       6,316,794,985,573      branches:u                #  363.410 M/sec                    ( +-  0.00% )
         251,013,232,547      branch-misses:u           #    3.97% of all branches          ( +-  0.01% )
      
           645.991174661 seconds time elapsed                                          ( +-  1.19% )
      
      Unfortunately, this approach doesn't help with text size:
      
        vmlinux.before .text size:	8190319
        vmlinux.after .text size:	8200623
      
      The .text section is increased by about 4k. Not sure if we can do anything
      about this.
      Signed-off-by: default avatarKirill A. Shuemov <kirill.shutemov@linux.intel.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Borislav Petkov <bp@suse.de>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: David Woodhouse <dwmw2@infradead.org>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/20180216114948.68868-4-kirill.shutemov@linux.intel.comSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      39b95522
  9. 16 Feb, 2018 6 commits
  10. 14 Feb, 2018 3 commits
  11. 16 Jan, 2018 1 commit
  12. 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
         lines).
      
      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>
      b2441318
  13. 29 Aug, 2017 1 commit
  14. 17 Aug, 2017 1 commit
  15. 18 Jul, 2017 4 commits
    • Tom Lendacky's avatar
      x86/mm: Add support to make use of Secure Memory Encryption · aca20d54
      Tom Lendacky authored
      Add support to check if SME has been enabled and if memory encryption
      should be activated (checking of command line option based on the
      configuration of the default state).  If memory encryption is to be
      activated, then the encryption mask is set and the kernel is encrypted
      "in place."
      Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brijesh Singh <brijesh.singh@amd.com>
      Cc: Dave Young <dyoung@redhat.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Larry Woodman <lwoodman@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Michael S. Tsirkin <mst@redhat.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Toshimitsu Kani <toshi.kani@hpe.com>
      Cc: kasan-dev@googlegroups.com
      Cc: kvm@vger.kernel.org
      Cc: linux-arch@vger.kernel.org
      Cc: linux-doc@vger.kernel.org
      Cc: linux-efi@vger.kernel.org
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/5f0da2fd4cce63f556117549e2c89c170072209f.1500319216.git.thomas.lendacky@amd.comSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      aca20d54
    • Tom Lendacky's avatar
      x86/mm: Insure that boot memory areas are mapped properly · b9d05200
      Tom Lendacky authored
      The boot data and command line data are present in memory in a decrypted
      state and are copied early in the boot process.  The early page fault
      support will map these areas as encrypted, so before attempting to copy
      them, add decrypted mappings so the data is accessed properly when copied.
      
      For the initrd, encrypt this data in place. Since the future mapping of
      the initrd area will be mapped as encrypted the data will be accessed
      properly.
      Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brijesh Singh <brijesh.singh@amd.com>
      Cc: Dave Young <dyoung@redhat.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Larry Woodman <lwoodman@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Michael S. Tsirkin <mst@redhat.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Toshimitsu Kani <toshi.kani@hpe.com>
      Cc: kasan-dev@googlegroups.com
      Cc: kvm@vger.kernel.org
      Cc: linux-arch@vger.kernel.org
      Cc: linux-doc@vger.kernel.org
      Cc: linux-efi@vger.kernel.org
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/bb0d430b41efefd45ee515aaf0979dcfda8b6a44.1500319216.git.thomas.lendacky@amd.comSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      b9d05200
    • Tom Lendacky's avatar
      x86/mm: Provide general kernel support for memory encryption · 21729f81
      Tom Lendacky authored
      Changes to the existing page table macros will allow the SME support to
      be enabled in a simple fashion with minimal changes to files that use these
      macros.  Since the memory encryption mask will now be part of the regular
      pagetable macros, we introduce two new macros (_PAGE_TABLE_NOENC and
      _KERNPG_TABLE_NOENC) to allow for early pagetable creation/initialization
      without the encryption mask before SME becomes active.  Two new pgprot()
      macros are defined to allow setting or clearing the page encryption mask.
      
      The FIXMAP_PAGE_NOCACHE define is introduced for use with MMIO.  SME does
      not support encryption for MMIO areas so this define removes the encryption
      mask from the page attribute.
      
      Two new macros are introduced (__sme_pa() / __sme_pa_nodebug()) to allow
      creating a physical address with the encryption mask.  These are used when
      working with the cr3 register so that the PGD can be encrypted. The current
      __va() macro is updated so that the virtual address is generated based off
      of the physical address without the encryption mask thus allowing the same
      virtual address to be generated regardless of whether encryption is enabled
      for that physical location or not.
      
      Also, an early initialization function is added for SME.  If SME is active,
      this function:
      
       - Updates the early_pmd_flags so that early page faults create mappings
         with the encryption mask.
      
       - Updates the __supported_pte_mask to include the encryption mask.
      
       - Updates the protection_map entries to include the encryption mask so
         that user-space allocations will automatically have the encryption mask
         applied.
      Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brijesh Singh <brijesh.singh@amd.com>
      Cc: Dave Young <dyoung@redhat.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Larry Woodman <lwoodman@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Michael S. Tsirkin <mst@redhat.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Toshimitsu Kani <toshi.kani@hpe.com>
      Cc: kasan-dev@googlegroups.com
      Cc: kvm@vger.kernel.org
      Cc: linux-arch@vger.kernel.org
      Cc: linux-doc@vger.kernel.org
      Cc: linux-efi@vger.kernel.org
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/b36e952c4c39767ae7f0a41cf5345adf27438480.1500319216.git.thomas.lendacky@amd.comSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      21729f81
    • Tom Lendacky's avatar
      x86/mm: Add support to enable SME in early boot processing · 5868f365
      Tom Lendacky authored
      Add support to the early boot code to use Secure Memory Encryption (SME).
      Since the kernel has been loaded into memory in a decrypted state, encrypt
      the kernel in place and update the early pagetables with the memory
      encryption mask so that new pagetable entries will use memory encryption.
      
      The routines to set the encryption mask and perform the encryption are
      stub routines for now with functionality to be added in a later patch.
      Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
      Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Cc: Alexander Potapenko <glider@google.com>
      Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brijesh Singh <brijesh.singh@amd.com>
      Cc: Dave Young <dyoung@redhat.com>
      Cc: Dmitry Vyukov <dvyukov@google.com>
      Cc: Jonathan Corbet <corbet@lwn.net>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Larry Woodman <lwoodman@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Michael S. Tsirkin <mst@redhat.com>
      Cc: Paolo Bonzini <pbonzini@redhat.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Radim Krčmář <rkrcmar@redhat.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Toshimitsu Kani <toshi.kani@hpe.com>
      Cc: kasan-dev@googlegroups.com
      Cc: kvm@vger.kernel.org
      Cc: linux-arch@vger.kernel.org
      Cc: linux-doc@vger.kernel.org
      Cc: linux-efi@vger.kernel.org
      Cc: linux-mm@kvack.org
      Link: http://lkml.kernel.org/r/e52ad781f085224bf835b3caff9aa3aee6febccb.1500319216.git.thomas.lendacky@amd.comSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      5868f365
  16. 20 Jun, 2017 1 commit
  17. 13 Jun, 2017 4 commits
  18. 13 Mar, 2017 1 commit
  19. 28 Jan, 2017 1 commit
    • Ingo Molnar's avatar
      x86/boot/e820: Move asm/e820.h to asm/e820/api.h · 66441bd3
      Ingo Molnar authored
      In line with asm/e820/types.h, move the e820 API declarations to
      asm/e820/api.h and update all usage sites.
      
      This is just a mechanical, obviously correct move & replace patch,
      there will be subsequent changes to clean up the code and to make
      better use of the new header organization.
      
      Cc: Alex Thorlton <athorlton@sgi.com>
      Cc: Andy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dan Williams <dan.j.williams@intel.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Huang, Ying <ying.huang@intel.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Juergen Gross <jgross@suse.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Paul Jackson <pj@sgi.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Rafael J. Wysocki <rjw@sisk.pl>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: Wei Yang <richard.weiyang@gmail.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: linux-kernel@vger.kernel.org
      Signed-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      66441bd3
  20. 11 Aug, 2016 1 commit
  21. 21 Jul, 2016 1 commit
    • Ingo Molnar's avatar
      x86/boot: Reorganize and clean up the BIOS area reservation code · edce2121
      Ingo Molnar authored
      So the reserve_ebda_region() code has accumulated a number of
      problems over the years that make it really difficult to read
      and understand:
      
      - The calculation of 'lowmem' and 'ebda_addr' is an unnecessarily
        interleaved mess of first lowmem, then ebda_addr, then lowmem tweaks...
      
      - 'lowmem' here means 'super low mem' - i.e. 16-bit addressable memory. In other
        parts of the x86 code 'lowmem' means 32-bit addressable memory... This makes it
        super confusing to read.
      
      - It does not help at all that we have various memory range markers, half of which
        are 'start of range', half of which are 'end of range' - but this crucial
        property is not obvious in the naming at all ... gave me a headache trying to
        understand all this.
      
      - Also, the 'ebda_addr' name sucks: it highlights that it's an address (which is
        obvious, all values here are addresses!), while it does not highlight that it's
        the _start_ of the EBDA region ...
      
      - 'BIOS_LOWMEM_KILOBYTES' says a lot of things, except that this is the only value
        that is a pointer to a value, not a memory range address!
      
      - The function name itself is a misnomer: it says 'reserve_ebda_region()' while
        its main purpose is to reserve all the firmware ROM typically between 640K and
        1MB, while the 'EBDA' part is only a small part of that ...
      
      - Likewise, the paravirt quirk flag name 'ebda_search' is misleading as well: this
        too should be about whether to reserve firmware areas in the paravirt case.
      
      - In fact thinking about this as 'end of RAM' is confusing: what this function
        *really* wants to reserve is firmware data and code areas! Once the thinking is
        inverted from a mixed 'ram' and 'reserved firmware area' notion to a pure
        'reserved area' notion everything becomes a lot clearer.
      
      To improve all this rewrite the whole code (without changing the logic):
      
      - Firstly invert the naming from 'lowmem end' to 'BIOS reserved area start'
        and propagate this concept through all the variable names and constants.
      
      	BIOS_RAM_SIZE_KB_PTR		// was: BIOS_LOWMEM_KILOBYTES
      
      	BIOS_START_MIN			// was: INSANE_CUTOFF
      
      	ebda_start			// was: ebda_addr
      	bios_start			// was: lowmem
      
      	BIOS_START_MAX			// was: LOWMEM_CAP
      
      - Then clean up the name of the function itself by renaming it
        to reserve_bios_regions() and renaming the ::ebda_search paravirt
        flag to ::reserve_bios_regions.
      
      - Fix up all the comments (fix typos), harmonize and simplify their
        formulation and remove comments that become unnecessary due to
        the much better naming all around.
      Signed-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      edce2121
  22. 22 Apr, 2016 1 commit
    • Luis R. Rodriguez's avatar
      x86/rtc: Replace paravirt rtc check with platform legacy quirk · 8d152e7a
      Luis R. Rodriguez authored
      We have 4 types of x86 platforms that disable RTC:
      
        * Intel MID
        * Lguest - uses paravirt
        * Xen dom-U - uses paravirt
        * x86 on legacy systems annotated with an ACPI legacy flag
      
      We can consolidate all of these into a platform specific legacy
      quirk set early in boot through i386_start_kernel() and through
      x86_64_start_reservations(). This deals with the RTC quirks which
      we can rely on through the hardware subarch, the ACPI check can
      be dealt with separately.
      
      For Xen things are bit more complex given that the @X86_SUBARCH_XEN
      x86_hardware_subarch is shared on for Xen which uses the PV path for
      both domU and dom0. Since the semantics for differentiating between
      the two are Xen specific we provide a platform helper to help override
      default legacy features -- x86_platform.set_legacy_features(). Use
      of this helper is highly discouraged, its only purpose should be
      to account for the lack of semantics available within your given
      x86_hardware_subarch.
      
      As per 0-day, this bumps the vmlinux size using i386-tinyconfig as
      follows:
      
      TOTAL   TEXT   init.text    x86_early_init_platform_quirks()
      +70     +62    +62          +43
      
      Only 8 bytes overhead total, as the main increase in size is
      all removed via __init.
      Suggested-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      Signed-off-by: default avatarLuis R. Rodriguez <mcgrof@kernel.org>
      Reviewed-by: default avatarJuergen Gross <jgross@suse.com>
      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>
      Cc: andrew.cooper3@citrix.com
      Cc: andriy.shevchenko@linux.intel.com
      Cc: bigeasy@linutronix.de
      Cc: boris.ostrovsky@oracle.com
      Cc: david.vrabel@citrix.com
      Cc: ffainelli@freebox.fr
      Cc: george.dunlap@citrix.com
      Cc: glin@suse.com
      Cc: jlee@suse.com
      Cc: josh@joshtriplett.org
      Cc: julien.grall@linaro.org
      Cc: konrad.wilk@oracle.com
      Cc: kozerkov@parallels.com
      Cc: lenb@kernel.org
      Cc: lguest@lists.ozlabs.org
      Cc: linux-acpi@vger.kernel.org
      Cc: lv.zheng@intel.com
      Cc: matt@codeblueprint.co.uk
      Cc: mbizon@freebox.fr
      Cc: rjw@rjwysocki.net
      Cc: robert.moore@intel.com
      Cc: rusty@rustcorp.com.au
      Cc: tiwai@suse.de
      Cc: toshi.kani@hp.com
      Cc: xen-devel@lists.xensource.com
      Link: http://lkml.kernel.org/r/1460592286-300-5-git-send-email-mcgrof@kernel.orgSigned-off-by: Ingo Molnar's avatarIngo Molnar <mingo@kernel.org>
      8d152e7a
  23. 09 Feb, 2016 1 commit
  24. 30 Jan, 2016 1 commit