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2006 Feb 24
2
[PATCH][discuss] evtchn race condition
...unstable.hg c/s 8961. c/s 8822 and 8828
(some necessary evtchn modifications) cause SVM partitions to fail with
"lost interrupt" hda error during boot.
We currently do not understand why these modifications are necessary and
in fact, a race occurs with one part of the patch (added
evtch_pending_sel if statement). Clearly this patch is not a final
solution, and we are continuing to debug this issue.
Any comments, insight are appreciated,
Tom
Signed-off-by: Tom Woller <thomas.woller@amd.com>
diff -r 4f838d2ac31a xen/arch/x86/hvm/io.c
--- a/xen/arch/x86/hvm/io.c Fri Feb 24 14:41:45 2006...
2006 Mar 10
12
[PATCH] Add SCHEDOP_block_on
This patch adds a facility to block on a particular event channel, for
when a domain needs to block, but cannot enable interrupts. A domain
uses the call something like this:
while (1) {
clear_evtchn_pending(evtchn);
if (check_for_data(evtchn))
break;
HYPERVISOR_block_on(evtchn);
}
The clear of the pending is needed to ensure that any subsequent calls
to block_on() don''t