id = 1800 title = "8.1.0-rc1 Regression: donkey in qemu advent calender 03/2020 has graphical artifacts" state = "closed" created_at = "2023-07-30T21:29:55.682Z" closed_at = "2023-08-07T01:16:42.411Z" labels = ["Closed::Fixed", "accel: TCG"] url = "https://gitlab.com/qemu-project/qemu/-/issues/1800" host-os = "Debian Linux 12" host-arch = "x86_64" qemu-version = "8.1.0-rc1 (commit 592134617c98f37b8b39c6dd684e5a1832c071d2)" guest-os = "FreeDos" guest-arch = "x86" description = """The game donkey shows graphical artifacts on playing. On changing the lane the car remains on its previous land as well. A git bisect identified commit 592134617c98f37b8b39c6dd684e5a1832c071d2 as culprit""" reproduce = """1. Download http://qemu-advent-calendar.org/2020/download/gw-basic.tar.xz 2. Start VM using command ``` qemu-system-i386 -m 16M -drive if=ide,format=qcow2,file=gwbasic.qcow2 ``` 3. Wait for GW-Basic prompt and enter (see README): F3 - donkey - - F2 4. Play to see graphical artifacts""" additional = """``` $ git bisect bad 592134617c98f37b8b39c6dd684e5a1832c071d2 is the first bad commit commit 592134617c98f37b8b39c6dd684e5a1832c071d2 Author: Richard Henderson Date: Sun Oct 30 12:07:32 2022 +1100 accel/tcg: Reorg system mode store helpers Instead of trying to unify all operations on uint64_t, use mmu_lookup() to perform the basic tlb hit and resolution. Create individual functions to handle access by size. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson accel/tcg/cputlb.c | 394 +++++++++++++++++++++++++---------------------------- 1 file changed, 186 insertions(+), 208 deletions(-) ```"""