Re: [Xen-devel] [xen-unstable test] 118078: regressions - FAIL

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.01.18 at 18:30, <Paul.Durrant@xxxxxxxxxx> wrote:
>> From: Xen-devel [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf
>> Of Paul Durrant
>> Sent: 16 January 2018 09:27
>> > From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
>> > Sent: 16 January 2018 08:58
>> > >>> On 16.01.18 at 09:43, <osstest-admin@xxxxxxxxxxxxxx> wrote:
>> > > flight 118078 xen-unstable real [real]
>> > > http://logs.test-lab.xenproject.org/osstest/logs/118078/ 
>> > >
>> > > Regressions :-(
>> > >
>> > > Tests which did not succeed and are blocking,
>> > > including tests which could not be run:
>> > >  build-arm64-pvops             6 kernel-build             fail REGR. vs. 
>> > > 118003
>> > >  test-amd64-amd64-xl-qemut-win7-amd64 10 windows-install  fail REGR.
>> vs.
>> > 118003
>> >
>> > Paul,
>> >
>> > is this last one something you could look into?
>> >
>> > (XEN) d4: VIRIDIAN GUEST_OS_ID: vendor: 1 os: 4 major: 6 minor: 1 sp: 0
>> > build: 1db0
>> > (XEN) d4: VIRIDIAN HYPERCALL: enabled: 1 pfn: 3ffff
>> > (XEN) d4v0: VIRIDIAN VP_ASSIST_PAGE: enabled: 1 pfn: 3fffe
>> > (XEN) domain_crash called from viridian.c:452
>> > (XEN) Domain 4 (vcpu#0) crashed on cpu#1:
>> > (XEN) ----[ Xen-4.11-unstable  x86_64  debug=y   Not tainted ]----
>> > (XEN) CPU:    1
>> > (XEN) RIP:    0010:[<fffff8000265d479>]
>> > (XEN) RFLAGS: 0000000000000286   CONTEXT: hvm guest (d4v0)
>> > (XEN) rax: 0000000000000000   rbx: fffff800027f7e80   rcx: 0000000000000001
>> > (XEN) rdx: 0000000000000000   rsi: fffffa800129d040   rdi: fffff80002805c40
>> > (XEN) rbp: 0000000000000080   rsp: fffff880009b0d80   r8:
>> 0000000000000000
>> > (XEN) r9:  fffff800027f7e80   r10: fffffa800129d040   r11: fffff800027f7e90
>> > (XEN) r12: fffff800008129a0   r13: fffff800028b9be0   r14: fffffa8001239b30
>> > (XEN) r15: fffff80000b96080   cr0: 0000000080050031   cr4:
>> 00000000000006b8
>> > (XEN) cr3: 0000000000187000   cr2: 0000000000000000
>> > (XEN) fsb: 0000000000000000   gsb: fffff800027f7d00   gss: fffff800027f7d00
>> > (XEN) ds: 002b   es: 002b   fs: 0053   gs: 002b   ss: 0018   cs: 0010
>> >
>> > I.e. the domain_crash() in viridian_start_apic_assist().
>> >
>> 
>> Yes, I'll have a look at that.
> 
> No real clue about this as yet. It is odd that the guest has only set up one 
> of the APIC assist pages and yet has taken an interrupt...
> 
> Jan 16 01:46:05.691223 (XEN) Dumping guest's current state at key_handler...
> Jan 16 01:46:05.691265 (XEN) Size of VMCB = 4096, paddr = 000000020f7f7000, 
> vaddr = ffff83020f7f7000
> Jan 16 01:46:05.699269 (XEN) cr_intercepts = 0xfef3fef3 dr_intercepts = 
> 0xffffffff exception_intercepts = 0x60082
> Jan 16 01:46:05.707128 (XEN) general1_intercepts = 0xbdc4000f 
> general2_intercepts = 0x2e7f
> Jan 16 01:46:05.715222 (XEN) iopm_base_pa = 0xdfd71000 msrpm_base_pa = 
> 0x20f7f4000 tsc_offset = 0xfffffc36684278c9
> Jan 16 01:46:05.723116 (XEN) tlb_control = 0 vintr = 0x1020001 
> interrupt_shadow = 0
> Jan 16 01:46:05.723153 (XEN) eventinj 000000008000002f, valid? 1, ec? 0, 
> type 0, vector 0x2f
> Jan 16 01:46:05.731141 (XEN) exitcode = 0x64 exitintinfo = 0
> Jan 16 01:46:05.739123 (XEN) exitinfo1 = 0 exitinfo2 = 0
> Jan 16 01:46:05.739157 (XEN) np_enable = 0x1 guest_asid = 0x4b49
> Jan 16 01:46:05.739187 (XEN) virtual vmload/vmsave = 0, virt_ext = 0
> 
> I'd expect it to have interrupts disabled at this point. Seemingly doesn't 
> repro on Intel h/w (although I was testing with Win7 SP1 rather than RTM) so 
> I'll try to find some AMD h/w and try again.

Well, it looks to be a random problem in the first place, or else we
would have known about the issue much earlier I think. I.e. I'm
not sure I see what you take the "AMD only" from here.

As to interrupt state - isn't it quite normal for an OS to bring up
the BSP first, enable interrupts on it, and then bring up APs?
That's how we do it in Xen.

Jan


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