RE: Revision 297176 - hyperv/evttimer: Use an independent message slot so that it can work

Hi smokehydration,
I guess your VM config file has something like "viridian = 1" or
"viridian_enlightenment=xxx".

With this, Xen tries to pretend to be Hyper-V, but obviously Xen can't be 100% Hyper-V.
BTW, I know at least KVM can have the same behavior.

We have to find a reliable way to distinguish Hyper-V from other hypervisors that
try to pretend to be Hyper-V...

Thanks,
-- Dexuan


> -----Original Message-----
> From: owner-freebsd-current_at_freebsd.org [mailto:owner-freebsd-
> current_at_freebsd.org] On Behalf Of Sepherosa Ziehau
> Sent: Friday, April 8, 2016 17:29
> To: smokehydration_at_tutanota.com
> Cc: freebsd-current_at_freebsd.org
> Subject: Re: Revision 297176 - hyperv/evttimer: Use an independent message
> slot so that it can work
> 
> I have reverted this change.  It will be brought back, after some code
> refactoring.
> 
> On Fri, Apr 8, 2016 at 4:22 PM,  <smokehydration_at_tutanota.com> wrote:
> >
> > Hello
> >
> > I recently update one of my many vms from an older CURRENT revision
> r297196
> > to r297659 and on reboot it just panics with the following:
> >
> > FreeBSD clang version 3.8.0 (tags/RELEHSE_380/final 262564) (based on LLVM
> > 3.8.0
> > )
> > VT(vga): text 80x25
> > Timecounter "Hyper-V" frequency 10000000 Hz quality 10000000
> > Kernel trap 9 with interrupts disabled
> >
> >
> > Fatal trap 9: general protection fault while in kernel mode
> > cpuid = 0: apic id = 00
> > instruction pointer     = 0x20:0xffffffff8100d6?9
> > stack pointer           = 0x28:oxffffffff820d5c30
> > frame pointer           = 0x28:oxffffffff820d5c40
> > code segment            = base 0x0, limit 0xfffff, type 0x1b
> >                         = DPL 0, pres 1, long 1, def32 0, gran 1
> > processor eflags        = IOPL = 0
> > current process         = 0 ()
> > [ thread pid 0 tid 0 ]
> > stopped at      hv_get_timecount+0x9:   rdmsr
> > db) wh
> > Tracing pid 0 tid 0 td 0xffffffff81d0eff0
> > hv_get_timecount() at hv_get_timecount+0x9/frame 0xffffffff820d5c40
> > tc_init() at tc_init+0x251/frame 0xffffffff820d5c90
> > mi_startup() at mi_startup+0x118/frame 0xffffffff820d5cb0
> > btext() at btext+ox2c                   =
> > db>
> >
> > I changed hv_hv.c back to the previous revision (297176) and no panics under
> > Xen VM.
> >
> > Thanks!
> >
> > p.s. not sure why Xen gets detected as HyperV
> >
> 
> 
> 
> --
> Tomorrow Will Never Die
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