Re: [Xen-devel] [xen-unstable test] 105966: regressions - FAIL

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 22.02.17 at 19:20, <osstest-admin@xxxxxxxxxxxxxx> wrote:
> flight 105966 xen-unstable real [real]
> http://logs.test-lab.xenproject.org/osstest/logs/105966/ 
> 
> Regressions :-(
> 
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-amd64-amd64-qemuu-nested-amd 13 xen-boot/l1         fail REGR. vs. 
> 105933

(XEN) d5v0: Invalid EFER update: 0x1d01 -> 0x3901 - LMSLE without support
(XEN) hvm.c:1616:d3v0 All CPUs offline -- powering off.

Very interesting. Earlier instances of the first of these two messages
in the log indicate that this previously didn't cause the guest to die. I
can't guess which of the commits under test might be responsible,
though, so unless someone else has any idea we may need to wait
for the bisector to give us a clue. The most likely one would seem to
be 49de10f3c1 ("x86/hvm: Don't raise #GP behind the emulators
back for MSR accesses") - Andrew, is the much later #GP injection
(in hvm_do_resume()) perhaps the problem here? Shouldn't this
be done in svm_do_msr_access() and VMX's EXIT_REASON_MSR_WRITE
handling, respectively?

Jan


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