[Xen-users] xc_hvm_inject_trap() failing for int3 traps under Xen 4.2.2

[Antony Saba <Antony.Saba@xxxxxxxxxxxx>]

Hello,

Can anyone verify if reinjecting int3 mem_events work for them under Xen
4.2.2?

I'm trying to move some systems which are making use of int3 mem_events
from Xen 4.1.x to Xen 4.2.2, but seem to having an issue with
xc_hvm_inject_trap().

I've got a simple program that doesn't do anything but "_asm int 3" in
it's main.  Using the example in "tools/text/xen-access/", this is what
the output of "xen-access 14 int3" looks like.  The domain is frozen
after xen-access exits.

  xenaccess init
  max_pages = 40100
  starting int3 14
  Got event from Xen
  Got event from Xen
  INT3: rip=0000000000401000, gfn=1418f (vcpu 0)
  xc: error: Error -1 injecting int3: Internal error
  xenaccess shutting down on signal -1
  xenaccess shut down on signal -1
  xenaccess exit code -1

This shows up in xl dmesg (nothing else shows up with debug=y):
(XEN) d14v0: bogus time -341046118 (offsets -3367129229295/0)

The same behavior occurs with both 32-bit and 64-bit HVM guests.

I'm using Xen 4.2.2 built from the dist tarball.

dom0 is Ubuntu 12.04.2 using kernel 3.2.0-45-generic #70-Ubuntu SMP Wed
May 29 20:12:06 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

My CPU is an Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz

I've also tried on 2nd machine with the same Ubuntu/kernel versions, but
with the following CPU: Intel(R) Core(TM) i7-2720QM CPU @ 2.20GHz

On 4.1.2, the result of xc_hvm_inject_trap() is always non-zero and
errno is set to ENOENT, but the int3 is reinjected anyway and works as
expected.

-Tony

-- 
Antony Saba, antony.saba@xxxxxxxxxxxx
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