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

From: Richard Henderson
Subject: [Bug 1699567] Re: Qemu does not force SSE data alignment
Date: Mon, 30 Nov 2020 15:25:26 -0000

Yep.  Long-standing bug.

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

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  Qemu does not force SSE data alignment

Status in QEMU:

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

  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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