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+id = 2183
+title = "aarch-64 emulation much slower since release 8.1.5 (issue also present on 8.2.1)"
+state = "closed"
+created_at = "2024-02-21T15:44:41.226Z"
+closed_at = "2024-04-12T13:30:03.954Z"
+labels = ["accel: TCG", "target: arm"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/2183"
+host-os = "RockyLinux 8"
+host-arch = "x86"
+qemu-version = "8.1.5"
+guest-os = "Linux"
+guest-arch = "ARM"
+description = """Since QEMU 8.1.5 our aarch64 based emulation got much slower. We use a linux 5.4 kernel which we cross-compile with the ARM toolchain. Things that are noticable:
+- Boot time got a lot longer
+- All memory accesses seem to take 3x longer (can be verified by e.g. executing below script, address does not matter):
+```
+date
+for i in $(seq 0 1000); do
+    devmem 0x200000000 2>/dev/null
+done
+date
+```"""
+reproduce = """Just boot an ARM based kernel on the virt machine and execute above script."""
+additional = """I've tried reproducing the issue on the master branch. There the issue is not present. It only seems to be present on releases 8.1.5 and 8.2.1. 
+
+I've narrowed the problem down to following commit on the 8.2 branch (@bonzini): ef74024b76bf285e247add8538c11cb3c7399a1a accel/tcg: Revert mapping of PCREL translation block to multiple virtual addresses.
+
+Let me know if any other information / tests are required."""