[Bug 1699567] Re: Qemu does not force SSE data alignment

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Thank you and sorry for the inconvenience.

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1699567

Title:
  Qemu does not force SSE data alignment

Status in QEMU:
  Incomplete

Bug description:
  I have an OS that tries to use SSE operations. It works fine in qemu.
  But it crashes when I try to run the OS at the host cpu using KVM.

  The instruction that crahes with #GP(0) is
   movaps ADDR,%xmm0

  The documentation says ADDR has to be 16-bytes alignment otherwise #GP
  is generated. And indeed the problem was with the data alignment.
  After adjusting it at my side the OS works fine both with Qemu and
  KVM.

  It would be great if QEMU followed specification more closely and
  forced SSE data alignment requirements. It will help to catch
  alignment issues early and debug it easier.

  
  $ qemu-system-x86_64 -version
  QEMU emulator version 2.9.50 (v2.9.0-1363-g95eef1c68b)
  Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

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