Re: [Xen-devel] [PATCH v7 00/15] x86/hvm: I/O emulation cleanup and fix | Full Backtrace of domU's X crash caused by SSE2 istruction in attachment

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Fabio Fantoni [mailto:fabio.fantoni@xxxxxxx]
> Sent: 10 July 2015 11:10
> To: Paul Durrant; xen-devel@xxxxxxxxxxxxx
> Cc: Jan Beulich; Andrew Cooper
> Subject: Re: [Xen-devel] [PATCH v7 00/15] x86/hvm: I/O emulation cleanup
> and fix | Full Backtrace of domU's X crash caused by SSE2 istruction in
> attachment
> 
> Il 10/07/2015 11:54, Fabio Fantoni ha scritto:
> > Il 10/07/2015 11:31, Paul Durrant ha scritto:
> >>> -----Original Message-----
> >>> From: Fabio Fantoni [mailto:fabio.fantoni@xxxxxxx]
> >>> Sent: 10 July 2015 10:28
> >>> To: Paul Durrant; xen-devel@xxxxxxxxxxxxx
> >>> Cc: Jan Beulich; Andrew Cooper
> >>> Subject: Re: [Xen-devel] [PATCH v7 00/15] x86/hvm: I/O emulation
> >>> cleanup
> >>> and fix | Full Backtrace of domU's X crash caused by SSE2 istruction in
> >>> attachment
> >>>
> >>> Il 09/07/2015 15:10, Paul Durrant ha scritto:
> >>>> This patch series re-works much of the code involved in emulation
> >>>> of port
> >>>> and memory mapped I/O for HVM guests.
> >>>>
> >>>> The code has become very convoluted and, at least by inspection,
> >>>> certain
> >>>> emulations will apparently malfunction.
> >>>>
> >>>> The series is broken down into 15 patches (which are also available in
> >>>> my xenbits repo:
> >>> http://xenbits.xen.org/gitweb/?p=people/pauldu/xen.git
> >>>> on the emulation34 branch).
> >>> Yesterday I retried with this version and seems that you fixed
> >>> something
> >>> that make possible atleast debug in the domU.
> >>>
> >>> I taken gdb data of X crash inside Sid hvm domU:
> >>> #0  sse2_blt (src_bits=<optimized out>, dst_bits=<optimized out>,
> >>> src_stride=<optimized out>, dst_stride=<optimized out>,
> >>> src_bpp=<optimized out>, src_x=<optimized out>, src_y=0, dest_x=0,
> >>> dest_y=0, width=1024, height=<optimized out>, dst_bpp=<optimized
> out>,
> >>> imp=<optimized out>) at ../../pixman/pixman-sse2.c:4773
> >>>
> >>> Latest istruction:
> >>> => 0x7f70360ef8eb <sse2_blt+459>:    movaps %xmm0,-0x10(%rsi)
> >>>
> >>> Full log in attachment.
> >>>
> >>> If you need more informations/tests tell me and I'll post them.
> >>>
> >> I imagine you got a GP fault due to handle_mmio() returning
> >> X86EMUL_UNHANDLEABLE, but that's only a guess.
> >> I suggest you try to instrument Xen a little to find out why.
> > Thanks for reply, sorry but I not understand exactly what I must do.
> > Can you detail please?
> 
> I take a look in xen/arch/x86/x86_emulate/x86_emulate.c and the
> istruction seems like this other found by xengt developers:
> https://github.com/01org/XenGT-Preview-
> xen/commit/f2bad31f80f698a452c37cb39841da8e4f69350f
> 

Sounds like that patch is worth a try then.

  Paul

> >>
> >>    Paul
> >>
> >>> Thanks for any reply and sorry for my bad english.
> >>>
> >>>> Previous changelog
> >>>> ------------------
> >>>>
> >>>> v4:
> >>>>    - Removed previous patch (make sure translated MMIO reads or
> >>>>      writes fall within a page) and rebased rest of series.
> >>>>    - Address Jan's comments on patch #1
> >>>>
> >>>> v3:
> >>>>    - Addressed comments from Jan
> >>>>    - Re-ordered series to bring a couple of more trivial patches to
> >>>> the
> >>>>      front
> >>>>    - Backport to XenServer (4.5) now passing automated tests
> >>>>    - Tested on unstable with QEMU upstream and trad, with and without
> >>>>      HAP (to force shadow emulation)
> >>>>
> >>>> v2:
> >>>>    - Removed bogus assertion from patch #15
> >>>>    - Re-worked patch #17 after basic testing of back-port onto
> >>>> XenServer
> >>>>
> >>>> Subsequent changes are logged in the individual patch files (thanks
> >>>> to David Vrabel for that).
> >>>>
> >>>> Testing
> >>>> -------
> >>>>
> >>>> v6 of the series was been back-ported to staging-4.5 and then dropped
> >>>> onto the XenServer (Dundee) patch queue. All automated branch-
> safety
> >>> tests
> >>>> pass.
> >>>>
> >>>> v7 has just been compile tested since changes were largely
> >>>> cosmetic. It
> >>>> will be back-ported in the near future.
> >>>>
> >>>> _______________________________________________
> >>>> Xen-devel mailing list
> >>>> Xen-devel@xxxxxxxxxxxxx
> >>>> http://lists.xen.org/xen-devel
> >


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