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+id = 2154
+title = "ID_AA64MMFR2_EL1 is all zeros"
+state = "closed"
+created_at = "2024-02-07T15:32:57.377Z"
+closed_at = "2024-02-09T11:59:43.566Z"
+labels = ["Closed::Invalid"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2154"
+host-os = "MacOS Sonoma 14.0"
+host-arch = "Apple M1 (aarch64)"
+qemu-version = "8.2.1"
+guest-os = "Custom"
+guest-arch = "aarch64"
+description = """When the `ID_AA64MMFR2_EL1` register is read via `mrs x[n], ID_AA64MMFR2_EL1`, it is read as all zeros. This is at the very least not correct for `ID_AA64MMFR2_EL1.ST`, which describes support for small translation tables (FEAT_TTST)."""
+reproduce = """1. Run `mrs x[n], ID_AA64MMFR2_EL1` within qemu-system-aarch64"""
+additional = """FEAT_TTST is a relatively new aarch64 feature that appears to have caused many problems basically everywhere. However, [qemu has reportedly implemented it](https://www.qemu.org/2021/04/30/qemu-6-0-0/)."""