Hi,
On 03/10/2019 00:20, Brian Woods wrote:
On Wed, Oct 02, 2019 at 02:22:49PM -0700, Brian Woods wrote:
On Wed, Oct 02, 2019 at 08:59:28PM +0100, Julien Grall wrote:
Hi,
On 10/2/19 7:56 PM, Brian Woods wrote:
Hmmm, the first e-mail didn't land in my inbox directly (I have a filter
send to a separate directory any e-mail I not CCed on). Did you BCC me by
any change?
That's odd. I know I copied your and Stefano's email addresses from the
MAINTAINERS file but under my sent emails it shows it has having no
CCs... PEBCAK I guess. My apologies.
Let see try to troubleshoot it first :).
Well, any attachment you send on the ML will store to each subscribers
mailbox. I let you do the math here ;)
So yeah, pastebin is always the preferred way when you have to send the full
log.
Thank you for the log. So that's probably not a double-init then.
Looking back at the log, the values look quite sane. So I am not entirely
sure what is happening.
I would check that the frametable is correctly zeroed. You could add a print
at the end of setup_frametable_mappings(...) to dump the count_info for the
page. Something like:
mfn_to_page(_mfn(0x01533))->count_info;
If it is correctly initialized, it should be zero.
The next step would be to add a similar print in start_xen()
(xen/arch/arm/setup.c) and see where the value is not 0 anymore.
Cheers,
--
Julien Grall
I'll go ahead add those and see if that leads to anything.
--
Brian Woods
Ok, I added:
printk("BW_DEBUG: 01 count_info=0x%016lx\n",
mfn_to_page(_mfn(0x01533))->count_info);
In some places. I'm not sure about some of the earlier ones (the ones
before the UART is set up), but all of the ones afterwards that
actually get output are:
BW_DEBUG: 11 count_info=0x0180000000000000
Is it worth trying to figure out where the printk buffer is and reading
it really early on?
If you haven't enable EARLY_PRINTK in Xen, then you may want to do it. This
would help you to understand where the page->count_info is not zeroed.
Cheers,
--
Julien Grall
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