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[Launchpad Bug Tracker <1712803@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package qemu - 1:2.5+dfsg-5ubuntu10.21

---------------
qemu (1:2.5+dfsg-5ubuntu10.21) xenial; urgency=medium

  * debian/patches/ubuntu/lp-1712803-hypercalls_backport.patch: support
    newer hcalls; Thanks to Yasmin Beatriz Alves da Silva. (LP: #1712803).

 -- Christian Ehrhardt <christian.ehrhardt@xxxxxxxxxxxxx>  Thu, 08 Feb
2018 14:06:39 +0100

** Changed in: qemu (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1712803

Title:
  spapr_hcall from ubuntu_kvm_unit_test failed on ppc64el with Z-hwe
  kernel

Status in linux package in Ubuntu:
  Triaged
Status in qemu package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  New
Status in qemu source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * Xenial with HWE kernel (matching new relesaes) and qemu without cloud
     archive (not matching new releases) could trigger hypercalls that are 
     not supported in xenials-qemu.

   * There is no "real" case other than kvm tests yet to trigger it yet, but 
     it is an easy and well contained fix, so we might fix proactively.

  [Test Case]

    1. deploy xenial + HWE kernel on a ppc64el box
    2. sudo apt-get install qemu-kvm -y
    3. git clone --depth=1 https://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git
    4. cd kvm-unit-tests
    5. ./configure --endian=little; make
    6. sudo ppc64_cpu --smt=off
    7. sudo ./run_tests -v

  [Regression Potential]

   * The changes are all upstream since a long time now (lowering the risk 
     of silly mistakes)
   * The changes are isolated to ppc, so in the worst case only this arch 
     should regress.
   * We implement new hcalls, so if anything there might be a regression if 
     software expected them to fail, but now breaks by them working (don't 
     think so given the nature of these hcalls).

  [Other Info]
   
   * n/a

  ---

  kernel: 4.10.0-33.37~16.04.1

  I think this issue was introduced by the old qemu version (similar
  issue was spotted on Xenial before), will need to investigate this
  further.

  qemu-system-ppc64 -machine pseries,accel=kvm -bios powerpc/boot_rom.bin -display none -serial stdio -kernel powerpc/spapr_hcall.elf -smp 1
  FAIL: hypercall: h_set_sprg0: sprg0 = 0xcafebabedeadbeef
  FAIL: hypercall: h_set_sprg0: sprg0 = 0xaaaaaaaa55555555
  FAIL: hypercall: h_set_sprg0: sprg0 = 0x41a588
  FAIL: hypercall: h_page_init: h_zero_page
  FAIL: hypercall: h_page_init: h_copy_page
  FAIL: hypercall: h_page_init: h_copy_page+h_zero_page
  FAIL: hypercall: h_page_init: h_zero_page unaligned dst
  FAIL: hypercall: h_page_init: h_copy_page unaligned src
  XFAIL: hypercall: h_random: h-call available

  SUMMARY: 9 tests, 8 unexpected failures, 1 expected failures

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