Qemu does not force SSE data alignment
Bug #1699567 reported by
Anatol Pomozov
This bug affects 2 people
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| QEMU |
Expired
|
Undecided
|
Unassigned | ||
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-
Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers
Revision history for this message
| Thomas Huth (th-huth) wrote | #1 |
| Changed in qemu: | |
| status: | New → Incomplete |
Revision history for this message
| Daniel Bokser (danb91) wrote | #2 |
| Changed in qemu: | |
| status: | Incomplete → New |
Revision history for this message
| Richard Henderson (rth) wrote | #3 |
| Changed in qemu: | |
| status: | New → Confirmed |
Revision history for this message
| Thomas Huth (th-huth) wrote Moved bug report | #4 |
| Changed in qemu: | |
| status: | Confirmed → Expired |
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