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[Xen-devel] [xen-4.10-testing test] 117647: regressions - FAIL



flight 117647 xen-4.10-testing real [real]
http://logs.test-lab.xenproject.org/osstest/logs/117647/

Regressions :-(

Tests which did not succeed and are blocking,
including tests which could not be run:
 test-arm64-arm64-libvirt-xsm  7 xen-boot                 fail REGR. vs. 117130

Tests which did not succeed, but are not blocking:
 test-amd64-amd64-xl-pvhv2-intel 12 guest-start                 fail never pass
 test-amd64-amd64-xl-pvhv2-amd 12 guest-start                  fail  never pass
 test-amd64-i386-libvirt      13 migrate-support-check        fail   never pass
 test-amd64-amd64-libvirt-xsm 13 migrate-support-check        fail   never pass
 test-amd64-amd64-libvirt     13 migrate-support-check        fail   never pass
 test-amd64-i386-libvirt-xsm  13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl          13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl-credit2  13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl          14 saverestore-support-check    fail   never pass
 test-arm64-arm64-xl-credit2  14 saverestore-support-check    fail   never pass
 test-arm64-arm64-xl-xsm      13 migrate-support-check        fail   never pass
 test-arm64-arm64-xl-xsm      14 saverestore-support-check    fail   never pass
 test-amd64-i386-libvirt-qemuu-debianhvm-amd64-xsm 11 migrate-support-check 
fail never pass
 test-amd64-amd64-libvirt-qemuu-debianhvm-amd64-xsm 11 migrate-support-check 
fail never pass
 test-amd64-amd64-libvirt-vhd 12 migrate-support-check        fail   never pass
 test-armhf-armhf-libvirt     13 migrate-support-check        fail   never pass
 test-armhf-armhf-libvirt     14 saverestore-support-check    fail   never pass
 test-amd64-amd64-qemuu-nested-amd 17 debian-hvm-install/l1/l2  fail never pass
 test-armhf-armhf-xl-arndale  13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-arndale  14 saverestore-support-check    fail   never pass
 test-armhf-armhf-libvirt-xsm 13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-multivcpu 13 migrate-support-check        fail  never pass
 test-armhf-armhf-xl-multivcpu 14 saverestore-support-check    fail  never pass
 test-armhf-armhf-libvirt-xsm 14 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl-rtds     13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-rtds     14 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl          13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl          14 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl-credit2  13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-credit2  14 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl-cubietruck 13 migrate-support-check        fail never pass
 test-armhf-armhf-xl-cubietruck 14 saverestore-support-check    fail never pass
 test-amd64-amd64-xl-qemut-win7-amd64 17 guest-stop             fail never pass
 test-amd64-amd64-xl-qemuu-win7-amd64 17 guest-stop             fail never pass
 test-amd64-i386-xl-qemuu-win7-amd64 17 guest-stop              fail never pass
 test-amd64-i386-xl-qemut-win7-amd64 17 guest-stop              fail never pass
 test-amd64-amd64-xl-qemuu-ws16-amd64 17 guest-stop             fail never pass
 test-armhf-armhf-libvirt-raw 12 migrate-support-check        fail   never pass
 test-armhf-armhf-libvirt-raw 13 saverestore-support-check    fail   never pass
 test-armhf-armhf-xl-vhd      12 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-vhd      13 saverestore-support-check    fail   never pass
 test-amd64-amd64-xl-qemut-ws16-amd64 17 guest-stop             fail never pass
 test-amd64-i386-xl-qemut-ws16-amd64 17 guest-stop              fail never pass
 test-armhf-armhf-xl-xsm      13 migrate-support-check        fail   never pass
 test-armhf-armhf-xl-xsm      14 saverestore-support-check    fail   never pass
 test-amd64-i386-xl-qemuu-ws16-amd64 17 guest-stop              fail never pass
 test-amd64-amd64-xl-qemut-win10-i386 10 windows-install        fail never pass
 test-amd64-amd64-xl-qemuu-win10-i386 10 windows-install        fail never pass
 test-amd64-i386-xl-qemuu-win10-i386 10 windows-install         fail never pass
 test-amd64-i386-xl-qemut-win10-i386 10 windows-install         fail never pass

version targeted for testing:
 xen                  a87ec4833af47cdd166294f3f4db21231930d65d
baseline version:
 xen                  44ce23c0d811c08bb559c46a171b234c3ff714a2

Last test of basis   117130  2017-12-14 07:54:15 Z   23 days
Failing since        117522  2018-01-02 16:48:28 Z    3 days    4 attempts
Testing same since   117647  2018-01-05 07:14:51 Z    1 days    1 attempts

------------------------------------------------------------
People who touched revisions under test:
  Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  Daniel Kiper <daniel.kiper@xxxxxxxxxx>
  Ingo Molnar <mingo@xxxxxxxxxx>
  Jan Beulich <jbeulich@xxxxxxxx>
  Kevin Tian <kevin.tian@xxxxxxxxx>
  Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
  Stefano Stabellini <sstabellini@xxxxxxxxxx>
  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
  Tom Lendacky <thomas.lendacky@xxxxxxx>

jobs:
 build-amd64-xsm                                              pass    
 build-arm64-xsm                                              pass    
 build-armhf-xsm                                              pass    
 build-i386-xsm                                               pass    
 build-amd64-xtf                                              pass    
 build-amd64                                                  pass    
 build-arm64                                                  pass    
 build-armhf                                                  pass    
 build-i386                                                   pass    
 build-amd64-libvirt                                          pass    
 build-arm64-libvirt                                          pass    
 build-armhf-libvirt                                          pass    
 build-i386-libvirt                                           pass    
 build-amd64-prev                                             pass    
 build-i386-prev                                              pass    
 build-amd64-pvops                                            pass    
 build-arm64-pvops                                            pass    
 build-armhf-pvops                                            pass    
 build-i386-pvops                                             pass    
 build-amd64-rumprun                                          pass    
 build-i386-rumprun                                           pass    
 test-xtf-amd64-amd64-1                                       pass    
 test-xtf-amd64-amd64-2                                       pass    
 test-xtf-amd64-amd64-3                                       pass    
 test-xtf-amd64-amd64-4                                       pass    
 test-xtf-amd64-amd64-5                                       pass    
 test-amd64-amd64-xl                                          pass    
 test-arm64-arm64-xl                                          pass    
 test-armhf-armhf-xl                                          pass    
 test-amd64-i386-xl                                           pass    
 test-amd64-amd64-xl-qemut-debianhvm-amd64-xsm                pass    
 test-amd64-i386-xl-qemut-debianhvm-amd64-xsm                 pass    
 test-amd64-amd64-libvirt-qemuu-debianhvm-amd64-xsm           pass    
 test-amd64-i386-libvirt-qemuu-debianhvm-amd64-xsm            pass    
 test-amd64-amd64-xl-qemuu-debianhvm-amd64-xsm                pass    
 test-amd64-i386-xl-qemuu-debianhvm-amd64-xsm                 pass    
 test-amd64-amd64-xl-qemut-stubdom-debianhvm-amd64-xsm        pass    
 test-amd64-i386-xl-qemut-stubdom-debianhvm-amd64-xsm         pass    
 test-amd64-amd64-libvirt-xsm                                 pass    
 test-arm64-arm64-libvirt-xsm                                 fail    
 test-armhf-armhf-libvirt-xsm                                 pass    
 test-amd64-i386-libvirt-xsm                                  pass    
 test-amd64-amd64-xl-xsm                                      pass    
 test-arm64-arm64-xl-xsm                                      pass    
 test-armhf-armhf-xl-xsm                                      pass    
 test-amd64-i386-xl-xsm                                       pass    
 test-amd64-amd64-qemuu-nested-amd                            fail    
 test-amd64-amd64-xl-pvhv2-amd                                fail    
 test-amd64-i386-qemut-rhel6hvm-amd                           pass    
 test-amd64-i386-qemuu-rhel6hvm-amd                           pass    
 test-amd64-amd64-xl-qemut-debianhvm-amd64                    pass    
 test-amd64-i386-xl-qemut-debianhvm-amd64                     pass    
 test-amd64-amd64-xl-qemuu-debianhvm-amd64                    pass    
 test-amd64-i386-xl-qemuu-debianhvm-amd64                     pass    
 test-amd64-i386-freebsd10-amd64                              pass    
 test-amd64-amd64-xl-qemuu-ovmf-amd64                         pass    
 test-amd64-i386-xl-qemuu-ovmf-amd64                          pass    
 test-amd64-amd64-rumprun-amd64                               pass    
 test-amd64-amd64-xl-qemut-win7-amd64                         fail    
 test-amd64-i386-xl-qemut-win7-amd64                          fail    
 test-amd64-amd64-xl-qemuu-win7-amd64                         fail    
 test-amd64-i386-xl-qemuu-win7-amd64                          fail    
 test-amd64-amd64-xl-qemut-ws16-amd64                         fail    
 test-amd64-i386-xl-qemut-ws16-amd64                          fail    
 test-amd64-amd64-xl-qemuu-ws16-amd64                         fail    
 test-amd64-i386-xl-qemuu-ws16-amd64                          fail    
 test-armhf-armhf-xl-arndale                                  pass    
 test-amd64-amd64-xl-credit2                                  pass    
 test-arm64-arm64-xl-credit2                                  pass    
 test-armhf-armhf-xl-credit2                                  pass    
 test-armhf-armhf-xl-cubietruck                               pass    
 test-amd64-i386-freebsd10-i386                               pass    
 test-amd64-i386-rumprun-i386                                 pass    
 test-amd64-amd64-xl-qemut-win10-i386                         fail    
 test-amd64-i386-xl-qemut-win10-i386                          fail    
 test-amd64-amd64-xl-qemuu-win10-i386                         fail    
 test-amd64-i386-xl-qemuu-win10-i386                          fail    
 test-amd64-amd64-qemuu-nested-intel                          pass    
 test-amd64-amd64-xl-pvhv2-intel                              fail    
 test-amd64-i386-qemut-rhel6hvm-intel                         pass    
 test-amd64-i386-qemuu-rhel6hvm-intel                         pass    
 test-amd64-amd64-libvirt                                     pass    
 test-armhf-armhf-libvirt                                     pass    
 test-amd64-i386-libvirt                                      pass    
 test-amd64-amd64-migrupgrade                                 pass    
 test-amd64-i386-migrupgrade                                  pass    
 test-amd64-amd64-xl-multivcpu                                pass    
 test-armhf-armhf-xl-multivcpu                                pass    
 test-amd64-amd64-pair                                        pass    
 test-amd64-i386-pair                                         pass    
 test-amd64-amd64-libvirt-pair                                pass    
 test-amd64-i386-libvirt-pair                                 pass    
 test-amd64-amd64-amd64-pvgrub                                pass    
 test-amd64-amd64-i386-pvgrub                                 pass    
 test-amd64-amd64-pygrub                                      pass    
 test-amd64-amd64-xl-qcow2                                    pass    
 test-armhf-armhf-libvirt-raw                                 pass    
 test-amd64-i386-xl-raw                                       pass    
 test-amd64-amd64-xl-rtds                                     pass    
 test-armhf-armhf-xl-rtds                                     pass    
 test-amd64-amd64-libvirt-vhd                                 pass    
 test-armhf-armhf-xl-vhd                                      pass    


------------------------------------------------------------
sg-report-flight on osstest.test-lab.xenproject.org
logs: /home/logs/logs
images: /home/logs/images

Logs, config files, etc. are available at
    http://logs.test-lab.xenproject.org/osstest/logs

Explanation of these reports, and of osstest in general, is at
    http://xenbits.xen.org/gitweb/?p=osstest.git;a=blob;f=README.email;hb=master
    http://xenbits.xen.org/gitweb/?p=osstest.git;a=blob;f=README;hb=master

Test harness code can be found at
    http://xenbits.xen.org/gitweb?p=osstest.git;a=summary


Not pushing.

------------------------------------------------------------
commit a87ec4833af47cdd166294f3f4db21231930d65d
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date:   Thu Jan 4 14:32:01 2018 +0100

    x86/msr: Free msr_vcpu_policy during vcpu destruction
    
    c/s 4187f79dc7 "x86/msr: introduce struct msr_vcpu_policy" introduced a
    per-vcpu memory allocation, but failed to free it in the clean vcpu
    destruction case.
    
    This is XSA-253.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: e204e60f77702bf5c884dd37c3f1b01f14e396ae
    master date: 2018-01-04 14:27:38 +0100

commit 9dc5eda576bafca47abc7202f075f28d6250bf4d
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date:   Wed Dec 20 15:45:32 2017 +0100

    x86/vmx: Don't use hvm_inject_hw_exception() in long_mode_do_msr_write()
    
    Since c/s 49de10f3c1718 "x86/hvm: Don't raise #GP behind the emulators back
    for MSR accesses", returning X86EMUL_EXCEPTION has pushed the exception
    generation to the top of the call tree.
    
    Using hvm_inject_hw_exception() and returning X86EMUL_EXCEPTION causes a
    double #GP injection, which combines to #DF.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 896ee3980e72866b602e743396751384de301fb0
    master date: 2017-12-14 18:05:45 +0000

commit 135b67e9bd5281084efe9fb1d3604915dac07ce8
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date:   Wed Dec 20 15:44:57 2017 +0100

    xen/efi: Fix build with clang-5.0
    
    The clang-5.0 build is reliably failing with:
    
      Error: size of boot.o:.text is 0x01
    
    which is because efi_arch_flush_dcache_area() exists as a single ret
    instruction.  Mark it as __init like everything else in the files.
    
    Spotted by Travis.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: c4f6ad4c5fd25cb0ccc0cdbe711db97e097f0407
    master date: 2017-12-14 10:59:26 +0000

commit 682a9d8d37f1141b199bc3aadf8d5d276b22baf9
Author: Jan Beulich <jbeulich@xxxxxxxx>
Date:   Wed Dec 20 15:44:20 2017 +0100

    gnttab: improve GNTTABOP_cache_flush locking
    
    Dropping the lock before returning from grant_map_exists() means handing
    possibly stale information back to the caller. Return back the pointer
    to the active entry instead, for the caller to release the lock once
    done.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andre Przywara <andre.przywara@xxxxxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    master commit: 553ac37137c2d1c03bf1b69cfb192ffbfe29daa4
    master date: 2017-12-04 11:04:18 +0100

commit 19dcd8e47dfc81b8e9f867ee79c7ff8e15b975fb
Author: Jan Beulich <jbeulich@xxxxxxxx>
Date:   Wed Dec 20 15:43:53 2017 +0100

    gnttab: correct GNTTABOP_cache_flush empty batch handling
    
    Jann validly points out that with a caller bogusly requesting a zero-
    element batch with non-zero high command bits (the ones used for
    continuation encoding), the assertion right before the call to
    hypercall_create_continuation() would trigger. A similar situation would
    arise afaict for non-empty batches with op and/or length zero in every
    element.
    
    While we want the former to succeed (as we do elsewhere for similar
    no-op requests), the latter can clearly be converted to an error, as
    this is a state that can't be the result of a prior operation.
    
    Take the opportunity and also correct the order of argument checks:
    We shouldn't accept zero-length elements with unknown bits set in "op".
    Also constify cache_flush()'s first parameter.
    
    Reported-by: Jann Horn <jannh@xxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andre Przywara <andre.przywara@xxxxxxxxxx>
    Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    master commit: 9c22e4d67f5552c7c896ed83bd95d5d4c5837a9d
    master date: 2017-12-04 11:03:32 +0100

commit e5364c32c650fef60b91b9be9b10f38055ffc2cf
Author: Tom Lendacky <thomas.lendacky@xxxxxxx>
Date:   Wed Dec 20 15:43:14 2017 +0100

    x86/microcode: Add support for fam17h microcode loading
    
    The size for the Microcode Patch Block (MPB) for an AMD family 17h
    processor is 3200 bytes.  Add a #define for fam17h so that it does
    not default to 2048 bytes and fail a microcode load/update.
    
    Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
    Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
    Reviewed-by: Borislav Petkov <bp@xxxxxxxxx>
    Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
    [Linux commit f4e9b7af0cd58dd039a0fb2cd67d57cea4889abf]
    
    Ported to Xen.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 61d458ba8c171809e8dd9abd19339c87f3f934ca
    master date: 2017-12-13 14:30:10 +0000

commit e2dc7b584f4c7ab6ad7ab543e5cf7ee2e6d1d569
Author: Jan Beulich <jbeulich@xxxxxxxx>
Date:   Wed Dec 20 15:42:42 2017 +0100

    x86/mm: drop bogus paging mode assertion
    
    Olaf has observed this assertion to trigger after an aborted migration
    of a PV guest:
    
    (XEN) Xen call trace:
    (XEN)    [<ffff82d0802a85dc>] do_page_fault+0x39f/0x55c
    (XEN)    [<ffff82d08036b7d8>] 
x86_64/entry.S#handle_exception_saved+0x66/0xa4
    (XEN)    [<ffff82d0802a9274>] __copy_to_user_ll+0x22/0x30
    (XEN)    [<ffff82d0802772d4>] update_runstate_area+0x19c/0x228
    (XEN)    [<ffff82d080277371>] domain.c#_update_runstate_area+0x11/0x39
    (XEN)    [<ffff82d080277596>] context_switch+0x1fd/0xf25
    (XEN)    [<ffff82d0802395c5>] schedule.c#schedule+0x303/0x6a8
    (XEN)    [<ffff82d08023d067>] softirq.c#__do_softirq+0x6c/0x95
    (XEN)    [<ffff82d08023d0da>] do_softirq+0x13/0x15
    (XEN)    [<ffff82d08036b2f1>] x86_64/entry.S#process_softirqs+0x21/0x30
    
    Release builds work fine, which is a first indication that the assertion
    isn't really needed.
    
    What's worse though - there appears to be a timing window where the
    guest runs in shadow mode, but not in log-dirty mode, and that is what
    triggers the assertion (the same could, afaict, be achieved by test-
    enabling shadow mode on a PV guest). This is because turing off log-
    dirty mode is being performed in two steps: First the log-dirty bit gets
    cleared (paging_log_dirty_disable() [having paused the domain] ->
    sh_disable_log_dirty() -> shadow_one_bit_disable()), followed by
    unpausing the domain and only then clearing shadow mode (via
    shadow_test_disable(), which pauses the domain a second time).
    
    Hence besides removing the ASSERT() here (or optionally replacing it by
    explicit translate and refcounts mode checks, but this seems rather
    pointless now that the three are tied together) I wonder whether either
    shadow_one_bit_disable() should turn off shadow mode if no other bit
    besides PG_SH_enable remains set (just like shadow_one_bit_enable()
    enables it if not already set), or the domain pausing scope should be
    extended so that both steps occur without the domain getting a chance to
    run in between.
    
    Reported-by: Olaf Hering <olaf@xxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Tim Deegan <tim@xxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: b95f7be32d668fa4b09300892ebe19636ecebe36
    master date: 2017-12-12 16:56:15 +0100

commit c8f4f45e04dd782ac5dfdf58866339ac97186324
Author: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
Date:   Wed Dec 20 15:42:13 2017 +0100

    x86/mb2: avoid Xen image when looking for module/crashkernel position
    
    Commit e22e1c4 (x86/EFI: avoid Xen image when looking for module/kexec
    position) added relevant check for EFI case. However, since commit
    f75a304 (x86: add multiboot2 protocol support for relocatable images)
    Multiboot2 compatible bootloaders are able to relocate Xen image too.
    So, we have to avoid also Xen image region in such cases.
    
    Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
    Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 9589927e5bf9e123ec42b6e0b0809f153bd92732
    master date: 2017-12-12 14:30:53 +0100

commit 4150501b717e7fde77c9ab4e96dd9916d7345b55
Author: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
Date:   Wed Dec 20 15:41:33 2017 +0100

    x86/vvmx: don't enable vmcs shadowing for nested guests
    
    Running "./xtf_runner vvmx" in L1 Xen under L0 Xen produces the
    following result on H/W with VMCS shadowing:
    
        Test: vmxon
        Failure in test_vmxon_in_root_cpl0()
          Expected 0x8200000f: VMfailValid(15) VMXON_IN_ROOT
               Got 0x82004400: VMfailValid(17408) <unknown>
        Test result: FAILURE
    
    This happens because SDM allows vmentries with enabled VMCS shadowing
    VM-execution control and VMCS link pointer value of ~0ull. But results
    of a nested VMREAD are undefined in such cases.
    
    Fix this by not copying the value of VMCS shadowing control from vmcs01
    to vmcs02.
    
    Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    master commit: 19fdb8e258619aea265af9c183e035e545cbc2d2
    master date: 2017-12-01 19:03:27 +0000

commit ab7be6ce4ac8cc3f32952d8c9c260412e780e939
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Date:   Wed Dec 20 15:40:58 2017 +0100

    xen/pv: Construct d0v0's GDT properly
    
    c/s cf6d39f8199 "x86/PV: properly populate descriptor tables" changed the 
GDT
    to reference zero_page for intermediate frames between the guest and Xen
    frames.
    
    Because dom0_construct_pv() doesn't call arch_set_info_guest(), some bits of
    initialisation are missed, including the pv_destroy_gdt() which initially
    fills the references to zero_page.
    
    In practice, this means there is a window between starting and the first 
call
    to HYPERCALL_set_gdt() were lar/lsl/verr/verw suffer non-architectural
    behaviour.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    master commit: 08f27f4468eedbeccaac9fdda4ef732247efd74e
    master date: 2017-12-01 19:03:26 +0000

commit f3fb6673d89858fa522037cc9b9475c188214998
Author: Jan Beulich <jbeulich@xxxxxxxx>
Date:   Wed Dec 20 15:39:44 2017 +0100

    update Xen version to 4.10.1-pre
(qemu changes not included)

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