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Allow to use pause_all_vcpus from VCPU context

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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: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2012-02-17 18:31:16 +01:00 committed by Avi Kivity
parent 8e564b4ebf
commit d798e97456
1 changed files with 12 additions and 0 deletions
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12
cpus.c
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@ -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;