I restarted QEMU without the '-smp 2' option and Windows XP started working again. The only problem is the host CPU usage will stay at 100% even with the guest CPU load being close to 0%. The only way to fix this problem that I know currently is to reinstall Windows XP.
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1914294 Title: Windows XP displays black screen when smp option is used Status in QEMU: New Bug description: When I use Windows XP with the -smp option, the screen goes black. The only thing I can see is a cursor. I have tried -smp 2, -smp cores=4, and -smp cores=2. My info: Host: M1 Mac Mac OS 11.1 QEMU 5.2 at cf7ca7d5b9faca13f1f8e3ea92cfb2f741eb0c0e. Guest: 32-bit Windows XP SP3 build 2600. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1914294/+subscriptions
