diff options
Diffstat (limited to 'gitlab/issues/target_missing/host_missing/accel_TCG/2899.toml')
| -rw-r--r-- | gitlab/issues/target_missing/host_missing/accel_TCG/2899.toml | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/gitlab/issues/target_missing/host_missing/accel_TCG/2899.toml b/gitlab/issues/target_missing/host_missing/accel_TCG/2899.toml new file mode 100644 index 00000000..51e8d86e --- /dev/null +++ b/gitlab/issues/target_missing/host_missing/accel_TCG/2899.toml @@ -0,0 +1,44 @@ +id = 2899 +title = "Regression 10.0.0rc1: Segmentation fault on executing QEMU advent calendar 2014, day 4" +state = "closed" +created_at = "2025-04-01T10:23:12.161Z" +closed_at = "2025-04-04T17:07:31.583Z" +labels = ["accel: TCG", "workflow::Patch available"] +url = "https://gitlab.com/qemu-project/qemu/-/issues/2899" +host-os = "Debian 12.10" +host-arch = "x86_64" +qemu-version = "QEMU emulator version 9.2.50 (v9.2.0-1215-g456709db50)" +guest-os = "Unknown" +guest-arch = "i386" +description = """On executing QEMU, a segmentation fault occurs""" +reproduce = """1. Download https://www.qemu-advent-calendar.org/2014/download/stxmas.tar.xz +2. Execute with QEMU command line""" +additional = """git bisect finishes with: + +``` +456709db50f424d112bc5f07260fdc51555f3a24 is the first bad commit +commit 456709db50f424d112bc5f07260fdc51555f3a24 +Author: Paolo Bonzini <pbonzini@redhat.com> +Date: Sun Dec 15 10:06:10 2024 +0100 + + target/i386: execute multiple REP/REPZ iterations without leaving TB + + Use a TCG loop so that it is not necessary to go through the setup steps + of REP and through the I/O check on every iteration. Interestingly, this + is not a particularly effective optimization on its own, though it avoids + the cost of correct RF emulation that was added in the previous patch. + The main benefit lies in allowing the hoisting of loop invariants outside + the loop, which will happen separately. + + The loop exits when the low 16 bits of CX/ECX/RCX are zero (so generally + speaking the string operation runs in 65536 iteration batches) to give + the main loop an opportunity to pick up interrupts. + + Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> + Reviewed-by: Richard Henderson <richard.henderson@linaro.org> + Link: https://lore.kernel.org/r/20241215090613.89588-12-pbonzini@redhat.com + Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> + + target/i386/tcg/translate.c | 55 ++++++++++++++++++++++++++++++++++++++++----- + 1 file changed, 49 insertions(+), 6 deletions(-) +```""" |