device: 0.845 vnc: 0.808 instruction: 0.690 network: 0.688 socket: 0.581 graphic: 0.441 semantic: 0.441 boot: 0.385 other: 0.284 KVM: 0.220 mistranslation: 0.180 assembly: 0.076 hw/remote/mpqemu-link.c:221: bad error checking ? hw/remote/mpqemu-link.c:221:36: warning: logical ‘and’ of mutually exclusive tests is always false [-Wlogical-op] Source code is if (msg->cmd >= MPQEMU_CMD_MAX && msg->cmd < 0) { return false; } Maybe better code: if (msg->cmd >= MPQEMU_CMD_MAX || msg->cmd < 0) { return false; } It might be useful to switch on gcc compiler flag -Wlogical-op to see these warnings. Thanks, I've reported it on the mailing list, and a patch has now been posted here: https://lists.gnu.org/archive/html/qemu-devel/2021-05/msg02106.html Fix has been merged now: https://gitlab.com/qemu-project/qemu/-/commit/dcf20655ffca2b0219d2914d