Il 09/10/2013 23:26, Paolo Bonzini ha scritto:
> Il 09/10/2013 21:41, Marcelo Tosatti ha scritto:
>>>> How was that tested? For BUS_MCEERR_AO it can work, but BUS_MCEERR_AR
>>>> calls force_sig_info which does this:
>>>>
>>>> ignored = action->sa.sa_handler == SIG_IGN;
>>>> blocked = sigismember(&t->blocked, sig);
>>>> if (blocked || ignored) {
>>>> action->sa.sa_handler = SIG_DFL;
>>>> if (blocked) {
>>>> sigdelset(&t->blocked, sig);
>>>> recalc_sigpending_and_wake(t);
>>>> }
>>>>
>>>> if (action->sa.sa_handler == SIG_DFL)
>>>> t->signal->flags &= ~SIGNAL_UNKILLABLE;
>>>>
>>>> and kills the process (because that's the default action of SIG_DFL).
>> For vcpu context its not blocked?
>
> It causes KVM to exit back to userspace, but as soon as KVM exits it
> should be blocked.
... but it's been queued and this bypasses the checks in force_sig_info.
So in guest mode it is accepted, in QEMU mode it causes a SIGBUS.
Paolo
