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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 11:31, 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

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:
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?


Thanks for any reply and sorry for my bad english.

Previous changelog

   - 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

   - Addressed comments from Jan
   - Re-ordered series to bring a couple of more trivial patches to the
   - 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)

   - 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).


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

v7 has just been compile tested since changes were largely cosmetic. It
will be back-ported in the near future.

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