I am using 970 Simulator for testing PPC Xen but I found that PPC Xen did not
work on 970 simulator from rev 11963.
It hangs after domain 0 is initialized and before shell prompt comes.
By some tracing, I found that there is no hypervisor decrementer exception at
all.
So it causes the domain 0 not to get scheduled again once it sets timer and be
blocked by hypercall.
Comparing the revisions, I found that it’s because of enabling of external
machine check interrupts, which was added from rev 11963.
I checked out the latest xen tree and commented out that line like the
following:
diff -r b30cb72ed5e2 xen/arch/powerpc/powerpc64/ppc970.c
--- a/xen/arch/powerpc/powerpc64/ppc970.c Fri Nov 03 16:53:17 2006 -0500
+++ b/xen/arch/powerpc/powerpc64/ppc970.c Wed Nov 08 09:37:07 2006 +0900
@@ -200,7 +200,7 @@ void cpu_initialize(int cpuid)
hid0.bits.en_therm = 0; /* ! Enable ext thermal ints */
/* only debug Xen should activate ATTN */
hid0.bits.en_attn = 1; /* Enable attn instruction */
- hid0.bits.en_mck = 1; /* Enable external machine check interrupts */
+// hid0.bits.en_mck = 1; /* Enable external machine check interrupts */
#ifdef SERIALIZE
hid0.bits.one_ppc = 1;
Then it worked on 970 simulator.
I am curious about why it does not work on simulator with en_mck = 1
Is there anyone who can explain this? Is it kind of a bug in simulator?
Regards,
Jang.
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