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Re: [Xen-devel] Problem with Xen 4.5 failing XTF tests on old AMD cpus ?

On 21/09/16 17:13, Ian Jackson wrote:
Platform Team regression test user writes ("[xen-4.5-testing baseline-only test] 
67737: regressions - FAIL"):
test-xtf-amd64-amd64-1 19 xtf/test-hvm32-invlpg~shadow fail REGR. vs. 67706
test-xtf-amd64-amd64-1 26 xtf/test-hvm32pae-invlpg~shadow fail REGR. vs. 67706
Several of these, 32bit and 64bit HVM.  This is in the Citrix
Cambridge osstest instance.  The Xen Project colo instance is
unaffected (flight 101045 there passed with the same revisions of

This is with:

   xen e4ae4b03d35babc9624b7286f1ea4c6749bad84b
   xtf b5c5332de4268d33a6f8eadc1d17c7b9cf0e7dc3
   linux b65f2f457c49b2cfd7967c34b7a0b04c25587f13
   linux-firmware c530a75c1e6a472b0eb9558310b518f0dfcd8860

The log says this:

   2016-09-21 06:07:36 Z ---------- substep 19 xtf/test-hvm32-invlpg~shadow 
running ----------
   2016-09-21 06:07:36 Z executing ssh ... root@                 
/home/xtf/xtf-runner -m logfile test-hvm32-invlpg~shadow 1>&2; echo $?

   Using logfile '/var/log/xen/console/guest-test-hvm32-invlpg~shadow.log'
   Executing 'xl create -F tests/invlpg/test-hvm32-invlpg~shadow.cfg'
   --- Xen Test Framework ---
   Environment: HVM 32bit (No paging)
   Testing 'invlpg' in normally-faulting conditions
     Test: Mapped address
     Test: Unmapped address
     Test: NULL segment override
     Test: Past segment limit
       Fail: Unexpected #GP[0000]
     Test: Before expand-down segment limit
       Fail: Unexpected #GP[0000]
   Test result: FAILURE

   Combined test results:
   test-hvm32-invlpg~shadow                 FAILURE

Sadly we haven't yet managed to make the logs from this instance

Do you have any idea what might be causing this ?  Is there a real
problem with the Xen 4.5 branch ?  The Citrix Cambridge instance has
old hardware.

This is the 4.5 tree missing some fixes:

* 31d961f - x86/hvm: Fix invalidation for emulated invlpg instructions (4 months ago) <Andrew Cooper> * eee511d - x86/svm: Don't unconditionally use a new ASID in svm_invlpg_intercept() (4 months ago) <Andrew Cooper> * a373db2 - x86/hvm: Correct the emulated interaction of invlpg with segments (4 months ago) <Andrew Cooper> * a94b35d - x86/hvm: Raise #SS faults for %ss-based segmentation violations (4 months ago) <Andrew Cooper> * 6093515 - x86/hvm: Always return the linear address from hvm_virtual_to_linear_addr() (4 months ago) <Andrew Cooper>

In this case, XTF is complaining that `invlpg`, as used in a shadow guest, is not behaving in the architecturally specified way.


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