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Diffstat (limited to 'results/scraper/launchpad-without-comments/1699567')
| -rw-r--r-- | results/scraper/launchpad-without-comments/1699567 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/results/scraper/launchpad-without-comments/1699567 b/results/scraper/launchpad-without-comments/1699567 new file mode 100644 index 00000000..11a5fb5e --- /dev/null +++ b/results/scraper/launchpad-without-comments/1699567 @@ -0,0 +1,15 @@ +Qemu does not force SSE data alignment + +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 \ No newline at end of file |