[Bug 1902267] Re: CPU not support 32-bit stack in 32-bit unreal mode

** Attachment removed: "my operating system" https://bugs.launchpad.net/qemu/+bug/1902267/+attachment/5429520/+files/FLATDOS.IMG ** Attachment added: "my operating system" https://bugs.launchpad.net/qemu/+bug/1902267/+attachment/5429530/+files/FLATDOS.IMG -- You received this bug notific

[Bug 1902267] [NEW] CPU not support 32-bit stack in 32-bit unreal mode

Public bug reported: QEMU version 5.0.0 supports 32-bit and 16-bit unreal mode. Great! Unfortunately, QEMU does not support 32-bit stack in unreal 32-bit mode. After the INT instruction, the stack is switched to 16-bit, which should not be the case. At BOCHS, my code works 100%. At QEMU not work

[Qemu-devel] [Bug 1812694] [NEW] qemu-system-x86_64 version 3.0+ is 20 times slower than version 2.12

Public bug reported: version 3.0+ is 20 times slower than version 2.12 I wrote a small 64-bit operating system (SIGMAOS) in which I use the lzma decoder. unpacking the file takes 20 times slower than in version 2.12. You can download it from https://drive.google.com/drive/folders/0B_wEiYjzVkC0ZG