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Re:QEMU 6.0 by HideousKojima on Friday April 30, 2021 @09:09AM (#26992915)
Yes:

https://xemu.app/

https://xqemu.com/

Are both original Xbox emulators built off of QEMU (Xemu is a fork of XQEMU). I've only used Xemu, but performance was pretty good for the games I tried on it (it doesn't have a way to upscale rendering yet though).

Re:QEMU 6.0 by MegaDeKay on Friday April 30, 2021 @10:07AM (#26993636)
Good news! Upscaling is in work but buggy right now.

https://github.com/mborgerson/xemu/tree/feat/surf-scale