[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Clock Interrupt not occurring. hypervisor_callback not being called. (more info)
Some more info on this problem. The problem seems to be that evtchn_pending[0] is not being updated fast enough after the callback is made. Therefore the callback is running and seeing nothing as pending and discarding anything that happens. If i put in something that delays before the start of the inner loop somewhere, it will work fine. It doesn't have to be a printf, can be a for(i=0;i<100000;i++) or something similar. evtchn_pending is set as volatile. Im not sure if this is actually helping at all though, since I have to use the ACK compiler which is the only thing that minix will compile with. Does anyone have any idea on how i can get evtchn_pending to update on time? Regards Ivan > <SNIP> > PUBLIC void > do_hypervisor_callback(struct stackframe_s *regs) > { > unsigned long l1, l2; > unsigned int l1i, l2i, port; > int irq; > shared_info_t *s = hypervisor_shared_info; > > s->vcpu_data[0].evtchn_upcall_pending = 0; > > l1 = x86_atomic_xchg(&s->evtchn_pending_sel, 0); > > while ( l1 != 0 ) > { > /* kprintf("l1: %x\n");*/ > l1i = x86_scan_forward(l1); > l1 &= ~(1 << l1i); > > l2 = s->evtchn_pending[l1i] & ~s->evtchn_mask[l1i]; > while ( l2 != 0 ) > { > kprintf("l2: %x\n", l2); > l2i = x86_scan_forward(l2); > l2 &= ~(1 << l2i); > > port = (l1i << 5) + l2i; > > if ( (irq = event_to_action[port]) != -1 ) { > do_event(irq, regs); > } > } > } > } > <ENDSNIP> > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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