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Diffstat (limited to 'gitlab/issues/target_arm/host_missing/accel_TCG/2183.toml')
| -rw-r--r-- | gitlab/issues/target_arm/host_missing/accel_TCG/2183.toml | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/gitlab/issues/target_arm/host_missing/accel_TCG/2183.toml b/gitlab/issues/target_arm/host_missing/accel_TCG/2183.toml new file mode 100644 index 000000000..168d7f4a9 --- /dev/null +++ b/gitlab/issues/target_arm/host_missing/accel_TCG/2183.toml @@ -0,0 +1,28 @@ +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.""" |