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-qemu-system-arm regression: NonSecure World can change Secure World MMU mapping.
-Description of problem:
-A NonSecure execution context is able to override MMU L1 translation table
-flags set by Secure context on Secure World memory.
-
-This is not consistent with the same code running on real hardware and it's a
-regression over past qemu releases as 9.0.0 behaves correctly.
-Steps to reproduce:
-This has been tested with
-[GoTEE-example](https://github.com/usbarmory/GoTEE-example) as follows:
-
-```
-# building tamago
-wget https://github.com/usbarmory/tamago-go/archive/refs/tags/latest.zip
-unzip latest.zip
-cd tamago-go-latest/src && ./all.bash
-cd ../bin && export TAMAGO=`pwd`/go
-
-# building and running GoTEE-example
-wget https://github.com/usbarmory/GoTEE-example/archive/refs/heads/master.zip
-unzip master.zip
-cd GoTEE-example
-export TARGET=usbarmory && make clean && make nonsecure_os_go && make trusted_applet_go && make trusted_os && make qemu
-```
-
-#
-Additional information:
-The issue relates to the fact that the NonSecure World, at startup, configures
-the MMU with the NX bit for the entire address space not belonging to its
-firmware .text area.
-
-On real hardware this MMU configuration by NonSecure world does not affect the
-Secure World translation tables.
-
-On qemu 9.1.0, however it does and this is inconsistent with real hardware
-behavior. On qemu 9.0.0 the behaviour is correct so the issue has been
-introduced between these two releases.
-
-The switch between Secure and NonSecure is done
-[here](https://github.com/usbarmory/GoTEE/blob/7e62563c0628fed3ee0aebb4702e22be9bb636e3/monitor/exec_arm.s#L73).
-
-The MMU first level address table which sets the NX bit is done
-[here](https://github.com/usbarmory/tamago/blob/273d67cd811dfcb1782c0fe596ac14d43d0ce117/arm/mmu.go#L85).