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

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

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?
>    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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