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kvm: consume internal signal with sigtimedwait

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Change the way the internal qemu signal, used for communication between
iothread and vcpus, is handled.

Block and consume it with sigtimedwait on the outer vcpu loop, which
allows more precise timing control.

Change from standard signal (SIGUSR1) to real-time one, so multiple
signals are not collapsed.

Set the signal number on KVM's in-kernel allowed sigmask.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2010-02-17 20:14:42 -02:00 • committed by Avi Kivity
parent fed6c3444c
commit cc84de9570
3 changed files with 97 additions and 12 deletions
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19
kvm-all.c
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@ -771,6 +771,7 @@ int kvm_cpu_exec(CPUState *env)
kvm_arch_post_run(env, run);
if (ret == -EINTR || ret == -EAGAIN) {
cpu_exit(env);
dprintf("io window exit\n");
ret = 0;
break;
@ -1116,3 +1117,21 @@ void kvm_remove_all_breakpoints(CPUState *current_env)
{
}
#endif /* !KVM_CAP_SET_GUEST_DEBUG */
int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset)
{
struct kvm_signal_mask *sigmask;
int r;
if (!sigset)
return kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, NULL);
sigmask = qemu_malloc(sizeof(*sigmask) + sizeof(*sigset));
sigmask->len = 8;
memcpy(sigmask->sigset, sigset, sizeof(*sigset));
r = kvm_vcpu_ioctl(env, KVM_SET_SIGNAL_MASK, sigmask);
free(sigmask);
return r;
}