Il 19/07/2013 14:58, Alexey Kardashevskiy ha scritto: > On 07/19/2013 10:50 PM, Paolo Bonzini wrote: >> Il 14/06/2013 12:32, Nikunj A Dadhania ha scritto: >>> Nikunj A Dadhania <nik...@linux.vnet.ibm.com> writes: >>>> commit 08521e28c7e6e8cc1f53424a0f845f58d2ed9546 >>>> Author: Paolo Bonzini <pbonz...@redhat.com> >>>> Date: Fri May 24 12:54:01 2013 +0200 >>>> >>>> memory: add big endian support to access_with_adjusted_size >>>> >>>> This will be used to split 8-byte access down to two four-byte >>>> accesses. >>>> >>>> Reviewed-by: Richard Henderson <r...@twiddle.net> >>>> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> >>>> >>>> >>>> If I hack the above funniness in my USB EHCI driver, somewhere down the >>>> qemu crashes at code introduced by this patch: >>>> >>>> Program received signal SIGSEGV, Segmentation fault. >>>> 0x0000000000000000 in ?? () >>>> (gdb) bt >>>> #0 0x0000000000000000 in ?? () >>>> #1 0x00005555557a0ea4 in access_with_adjusted_size (addr=addr@entry=12, >>>> value=value@entry=0x7fffd5a86680, size=size@entry=1, >>>> access_size_min=<optimized out>, access_size_max=<optimized out>, >>>> access=0x5555557a1f80 <memory_region_oldmmio_write_accessor>, >>>> opaque=0x5555567f8ab8) at /home/nikunj/work/power/code/qemu/memory.c:396 >>>> #2 0x00005555557a5ebb in memory_region_dispatch_write (size=1, data=0, >>>> addr=12, mr=0x5555567f8ab8) at >>>> /home/nikunj/work/power/code/qemu/memory.c:998 >>>> >>>> Reverting this, I can safely boot using a usb-storage device put on ehci >>>> controller. >>> >>> Just reverting this patch does not help though, i will need to figure >>> which all commits are bad. >> >> Hi Nikunj, >> >> can you try the attached patch? >> >> Alexey, with some luck it may even fix virtio-blk too. > > > Heh. Bad luck. The behaviour has changed slightly but it still does not work.
How changed? Paolo
