This was introduced recently in QEMU, see https://bugzilla.redhat.com/show_bug.cgi?id=1982165: Bus locks disrupts overall performance since it blocks all other cores (which must wait for the bus lock to be released before their memory operations). For VMM, it can detect every bus lock acquired by guest VMs and induces a VM exit. So VMM can count the number/frequency of bus lock and take some throttling action or just kill the guest. Tim Wiederhake (5): conf: Add bus-lock-ratelimit qemu: Add bus-lock-ratelimit doc: schema: Add bus-lock-ratelimit to domain schema tests: Add tests for bus-lock-ratelimit doc: Document new bus-lock-ratelimit option docs/formatdomain.rst | 4 +++ docs/schemas/domaincommon.rng | 7 +++++ src/conf/domain_conf.c | 34 +++++++++++++++++++++++ src/conf/domain_conf.h | 2 ++ src/qemu/qemu_command.c | 4 +++ src/qemu/qemu_validate.c | 1 + tests/qemuxml2argvdata/kvm-features.args | 2 +- tests/qemuxml2argvdata/kvm-features.xml | 1 + tests/qemuxml2xmloutdata/kvm-features.xml | 1 + 9 files changed, 55 insertions(+), 1 deletion(-) -- 2.31.1
