I mentioned that I accidentally pushed an upstream merge to
xenppc-unstable while it's still broken. There are a couple broken
things. First, DomU console stops mid-string early in boot. Could be an
event channel problem with the ring buffer; haven't investigated.
We seem to have an IPI problem, which causes vcpu_pause() to hang the
system. The following patch, tested on JS20 and JS21, illustrates it.
Before dom0 starts, IPIs work fine. After Linux's mpic_init(), IPIs (as
triggered by the 'I' keyhandler) lock the machine. Actually, it looks
like a message is trying to get out, because after a while we see a '('
emitted (presumably the first character in "(XEN)").
(When I comment out mpic_init() in dom0, Xen IPIs continue to work but
real IRQs (e.g. the IDE controller) fail in dom0.)
Why is this problem occurring only after an upstream merge? I don't
know. It's possible that some common IRQ code has changed to no longer
call the same arch-specific code, but I'm just speculating.
diff -r d6481755ade6 xen/arch/powerpc/setup.c
--- a/xen/arch/powerpc/setup.c Thu Jan 11 13:39:27 2007 -0600
+++ b/xen/arch/powerpc/setup.c Fri Jan 12 17:12:27 2007 -0600
@@ -438,7 +438,9 @@ static void __init __start_xen(multiboot
domain_unpause_by_systemcontroller(dom0);
#ifdef DEBUG_IPI
- ipi_torture_test();
+ //ipi_torture_test();
+ extern void do_ipi_test(char c);
+ do_ipi_test(0);
#endif
startup_cpu_idle_loop();
}
diff -r d6481755ade6 xen/common/keyhandler.c
--- a/xen/common/keyhandler.c Thu Jan 11 13:39:27 2007 -0600
+++ b/xen/common/keyhandler.c Fri Jan 12 17:44:46 2007 -0600
@@ -260,6 +260,16 @@ static void do_debug_key(unsigned char k
bit. */
}
+static void got_ipi(void *info)
+{
+ printk("CPU %u got IPI\n", smp_processor_id());
+}
+
+void do_ipi_test(unsigned char key)
+{
+ smp_call_function(got_ipi, NULL, 0, 0);
+}
+
void initialize_keytable(void)
{
open_softirq(KEYPRESS_SOFTIRQ, keypress_softirq);
@@ -286,6 +296,8 @@ void initialize_keytable(void)
#endif
register_irq_keyhandler('%', do_debug_key, "Trap to xendbg");
+
+ register_keyhandler('I', do_ipi_test, "IPI test");
}
/*
diff -r d6481755ade6 xen/drivers/char/console.c
--- a/xen/drivers/char/console.c Thu Jan 11 13:39:27 2007 -0600
+++ b/xen/drivers/char/console.c Fri Jan 12 17:09:01 2007 -0600
@@ -246,7 +246,7 @@ static void sercon_puts(const char *s)
/* CTRL-<switch_char> switches input direction between Xen and DOM0. */
#define SWITCH_CODE (opt_conswitch[0]-'a'+1)
-static int xen_rx = 1; /* FALSE => serial input passed to domain 0. */
+static int xen_rx = 0; /* FALSE => serial input passed to domain 0. */
static void switch_serial_input(void)
{
diff -r d6481755ade6 xen/include/asm-powerpc/smp.h
--- a/xen/include/asm-powerpc/smp.h Thu Jan 11 13:39:27 2007 -0600
+++ b/xen/include/asm-powerpc/smp.h Fri Jan 12 17:03:59 2007 -0600
@@ -52,7 +52,7 @@ void smp_event_check_interrupt(void);
void smp_event_check_interrupt(void);
void send_IPI_mask(cpumask_t mask, int vector);
-#undef DEBUG_IPI
+#define DEBUG_IPI
#ifdef DEBUG_IPI
void ipi_torture_test(void);
#endif
--
Hollis Blanchard
IBM Linux Technology Center
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