Commit d798e974 authored by Jan Kiszka's avatar Jan Kiszka Committed by Avi Kivity
Browse files

Allow to use pause_all_vcpus from VCPU context 



In order to perform critical manipulations on the VM state in the
context of a VCPU, specifically code patching, stopping and resuming of
all VCPUs may be necessary. resume_all_vcpus is already compatible, now
enable pause_all_vcpus for this use case by stopping the calling context
before starting to wait for the whole gang.

CC: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 8e564b4e

cpus.c

+12 −0
Original line number Diff line number Diff line
@@ -875,6 +875,18 @@ void pause_all_vcpus(void) 
        penv = penv->next_cpu;

    }



    if (!qemu_thread_is_self(&io_thread)) {

        cpu_stop_current();

        if (!kvm_enabled()) {

            while (penv) {

                penv->stop = 0;

                penv->stopped = 1;

                penv = penv->next_cpu;

            }

            return;

        }

    }



    while (!all_vcpus_paused()) {

        qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);

        penv = first_cpu;